Emerson 1098H Egr Pressure Reducing Regulators For Lp Gas Service Data Sheet

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Bulletin 71.2:1098-EGR
February 2015

Types 1098-EGR and 1098H-EGR Pressure
Reducing Regulators
•  Differential as low as
1 psi / 70 mbar

•  Materials of Construction
Compatible with Below
Grade Installations

•  Quick Change
Trim Package

• In-Service Travel
Inspection

•  No Atmospheric
Bleed

•  NPS 1 through 12 x 6 /
DN 25 through
300 x 150 Body Sizes
Available

W6956

•  Optional Noise
Abatement Trim
(Up to 30dBA reduction)

•  Aqueous
Trim Packages
(Application Specific)

•  Stainless Steel Construction
for Corrosive Environments
and Oxygen Service

D100143X012

•  Easy Top Entry In-Line
Maintenance

www.fisherregulators.com

Bulletin 71.2:1098-EGR
Specifications
The Specifications section lists pressure limitations and other specifications for various Types 1098-EGR and
1098H-EGR constructions. Specifications for a given regulator as it originally comes from the factory are stamped
on nameplates located on both the actuator and main valve body, while the pilot control spring range is displayed
on the pilot spring case and the pilot restriction code is stamped on the pilot body (S = standard gain, L = low
gain and H = high gain).
Port Diameters and Travels

Body Sizes and End Connection Styles
	
See Table 1

BODY SIZE

Main Valve Maximum Inlet Pressure(1)
	400 psig / 27.6 bar or body rating limit
whichever is lower
Maximum Pilot Supply Pressure(1)(2)
	
600 psig / 41.4 bar
Outlet Pressure Ranges
	
See Table 2
Maximum and Minimum Differential Pressures
	
See Table 4

DN

1

25

In.

TRAVEL
Standard

mm

In.

1-5/16 33.3

3/4

2-3/8

60.3

1-1/8

29

3

80

3-3/8

85.7

1-1/2

38

4

100

4-3/8

111

6

150

Pressure Registration
	External
Temperature Capabilities(1)
	
Nitrile (NBR): -20 to 180°F / -29 to 82°C
	
Fluorocarbon (FKM): 0 to 300°F / -18 to 149°C,
	
except water is limited to 0 to 200°F / -18 to 93°C
	
Ethylenepropylene (EPR):
	
-20 to 275°F / -29 to 135°C

mm

----

----

----

30

3/8

9.5

70

5/8

16

40

7/8

22

40

1

25

----

----

51

	
Main Valve
	
Body and Body Flange: Cast iron,
	  WCC Steel, CF8M Stainless steel		
	Cage: CF8M Stainless steel (Linear),
	  416 or 316 Stainless steel (Whisper Trim™) or 		
	  hardened ENC coated Cast iron (Quick Opening)
	
Seat Ring and Valve Plug: Hardened 416 Stainless
	
steel or 316 Stainless steel
	
Travel Indicator Assembly: Steel or Stainless steel
	  except plastic for indicator scale		
	
Piston Ring: Polytetrafluoroethylene (PTFE)
	
O-rings and Soft Parts: Nitrile (NBR) (standard),
	  Fluorocarbon (FKM) or Ethylenepropylene (EPR)	
	
Spring: Steel or Inconel® X-750
	
Bolting: Steel, Stainless steel

1. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.
2. For stability or overpressure protection, a reducing regulator may be installed upstream of the pilot according to the Installation section.

- continued -

2

2

In.

Construction Materials

Supply Pressure Settings Required for the
Type 95H Regulator
	
See Table 5

Inconel® is a mark owned by Special Metals Corporation.

19

50

183

Restricted

Percentage of
mm
Flow Capacity

2

200 x
8x6
150 and 7-3/16
and
300 x
12 x 6
150

Actuator Sizes and Maximum Pressures
	
See Table 3

Options
	
•  NACE Construction
	
•  Monitor Configuration
	
•  Boiler Fuel Construction
	
•  Aqueous (Liquid) Service Construction
	
•  Noise Abatement Trim

NPS

PORT
DIAMETER

Bulletin 71.2:1098-EGR
Specifications (continued)
Construction Materials (continued)
	Actuator
	
Bonnet: Zinc-plated Steel or 304 Stainless steel
	
Diaphragm Case: Steel or Stainless steel
	
Bolting: Steel, Stainless steel
	
Diaphragm Plate: Cast iron,
	
  316 or WCC Stainless steel
	
Stem Guide: Stainless steel
	
Diaphragm and O-rings: Nitrile (NBR) (standard),
	
  Fluorocarbon (FKM), Ethylenepropylene (EPDM)
	Stem: 17-4 PH Stainless steel (standard) or
	  316 Stainless steel
	
Pilot Mounting Parts
	
Tubing and Connector Fittings: Steel (standard)
	  or Stainless steel
	
Pipe Bushing: Malleable iron, Stainless steel
	
Pipe Nipples: Galvanized steel, Stainless steel
	
Type 6351 Pilot
	
Body, Body Plug and Spring Case: Aluminum
	
Valve Plug Stem: Brass (standard) or Stainless steel
	
Diaphragm, O-rings and Gaskets: Nitrile (NBR)
	 
(standard) or Fluorocarbon (FKM)
	
Type 6352, 6353, 6354L, 6354M or 6354H Pilot
	
Body, Body Plug, Spring Case and Closing Cap:
	
Aluminum (standard) or Stainless steel
	
Diaphragm: Nitrile (NBR), Fluorocarbon (FKM)
	
  or Ethylenepropylene (EPR)
	
Types 6354M and 6354H Diaphragm 		
	Limiter: Aluminum
	
O-rings and Soft Parts: Nitrile (NBR) (standard) or
	
  Fluorocarbon (FKM)
	
Filter: Brass (Type P594-1 standard) or Aluminum
	
  (Type P593-1), except cellulose for filter element
	
	
	
	
	
	
	

61 Series Pilots
Body and Spring Case: Cast iron
Upper and Lower Diaphragm: Nitrile (NBR),
  Neoprene (CR) or Fluorocarbon (FKM)  
Composition Seats: Nitrile (NBR) or
  Fluorocarbon (FKM)
O-rings: Nitrile (NBR) or Fluorocarbon (FKM)

	
	
	
	
	

Type Y600AM Pilot
Body, Spring Case and Lower Casing: Cast Iron
Diaphragm: Nitrile (NBR)
Composition Seats: Nitrile (NBR)		
Trim: Aluminum

	
	

Pilot and Actuator Vents	
Type Y602 vent assembly

Approximate Weights (With Standard SinglePilot Construction)
   Type 1098 Actuator
    Size 30
   NPS 1 / DN 25 Body: 55 lbs / 25 kg
   NPS 2 / DN 50 Body: 75 lbs / 34 kg
   NPS 3 / DN 80 Body: 115 lbs / 52 kg
   NPS 4 / DN 100 Body: 165 lbs / 75 kg
   NPS 6 / DN 150 Body: 350 lbs / 159 kg
    NPS 8 x 6 / DN 200 x 150 Body: 625 lbs / 284 kg
    NPS 12 x 6 / DN 300 x 150 Body: 1102 lbs / 500 kg
      Size 40 (Standard)
    NPS 1 / DN 25 Body: 65 lbs / 29 kg
    NPS 2 / DN 50 Body: 85 lbs / 39 kg
    NPS 3 / DN 80 Body: 125 lbs / 57 kg
    NPS 4 / DN 100 Body: 175 lbs / 79 kg
    NPS 6 / DN 150 Body: 360 lbs / 163 kg
    NPS 8 x 6 / DN 200 x 150 Body: 635 lbs / 288 kg
    NPS 12 x 6 / DN 300 x 150 Body: 1112 lbs / 504 kg
   Size 70
    NPS 1 / DN 25 Body: 140 lbs / 64 kg
    NPS 2 / DN 50 Body: 160 lbs / 73 kg
    NPS 3 / DN 80 Body: 200 lbs / 91 kg
    NPS 4 / DN 100 Body: 250 lbs / 113 kg
    NPS 6 / DN 150 Body: 435 lbs / 197 kg
    NPS 8 x 6 / DN 200 x 150 Body: 710 lbs / 322 kg
    NPS 12 x 6 / DN 300 x 150 Body: 1187 lbs / 538 kg
   Type 1098H Size 30 Actuator
    NPS 1 / DN 25 Body: 80 lbs / 36 kg
    NPS 2 / DN 50 Body: 100 lbs / 45 kg
    NPS 3 / DN 80 Body: 140 lbs / 64 kg
    NPS 4 / DN 100 Body: 190 lbs / 86 kg
    NPS 6 / DN 150 Body: 375 lbs / 170 kg
    NPS 8 x 6 / DN 200 x 150 Body: 650 lbs / 295 kg
    NPS 12 x 6 / DN 300 x 150 Body: 1127 lbs / 511 kg

Table 1. Body Sizes and End Connection Styles
Body Size

Cast Iron

Steel or stainless steel

25 or 50

NPT, CL125 FF or CL250 RF

NPT, CL150 RF, CL300 RF, CL600 RF, BWE, SWE or PN 16/25/40

3, 4 or 6

80, 100 or 150

CL125 FF or CL250 RF

CL150 RF, CL300 RF, CL600 RF, BWE or PN 16/25/40

8 x 6 or 12 x 6

200 x 150 or 300 x 150

----

CL150 RF, CL300 RF, CL600 RF or BWE

NPS

Dn

1 or 2

3

Bulletin 71.2:1098-EGR

TYPE 6351
TYPE 1098-EGR

TYPES 6352,
6353, 6354

A6563

INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE
Type 1098-EGR with 6350 series pilot

Figure 2. Operational Schematics

Introduction

Principle of Operation

The Types 1098-EGR and 1098H-EGR regulators provide
economical and accurate pressure control in a wide variety
of applications: natural gas distribution systems; fuel gas
supply to industrial boilers, furnaces, ovens and mixers;
and large commercial/industrial establishments such as
shopping centers and schools. They are also used in plant
air service and in liquid service where a slow stroking
time (approximately 30 to 90 seconds) is desired on both
opening and closing the main valve.

The pilot-operated Types 1098-EGR and 1098H-EGR
regulators both use inlet pressure as the operating
medium, which is reduced through pilot operation to load
the actuator diaphragm. Outlet or downstream pressure
opposes loading pressure in the actuator and also
opposes the pilot control spring. The Type 1098-EGR
regulator operation schematic is shown in Figure 2.

The superior performance of this regulator is due to the
amplifying effect of the pilot and the two-path control
system. Changes in outlet pressure act quickly on
the actuator diaphragm to provide fast response to
system changes. Then, the pilot amplifies any small
system changes to position the main valve for precise
pressure control.
Bubble-tight shutoff is achieved utilizing knife-edged seats
in the valve plug. When the regulator is in the closed
position, the knife-edged seats make a gas-tight seal
against the upper and lower (port) valve seal. A variety of
cages are offered for standard, speed of response and
noise applications. The cage-guided metal plug provides
superior control and stability.

4

In operation, assume that outlet pressure is below
the pilot control setting. Control spring force on the
pilot diaphragm thus opens the pilot valve plug,
providing additional loading pressure to the actuator
diaphragm. This loading pressure forces the actuator
stem upward, opening the main valve plug via a bump
connection. The upward motion of the plug allows gas
to flow through the cage into the downstream system.
When downstream demand has been satisfied, outlet
pressure tends to increase, acting on the pilot and
actuator diaphragms. This pressure exceeds the pilot
control spring setting, moving the pilot diaphragm away
and letting the valve plug spring (Type 6351, 61 Series
or Type Y600AM pilots) or bellows (Types 6352 through
6354M pilots) close the pilot valve plug (unbalanced in
the Type 6351 or 61 Series pilots but balanced in the
Types 6352 through 6354M pilots). Excess loading

Bulletin 71.2:1098-EGR

TYPE 1098-EGR

TYPE 1806

A6641

INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
ATMOSPHERIC PRESSURE

TYPE 61LD

Type 1098-EGR with type 61lD pilot and type 1806 relief valve

TYPE 1098-EGR
TYPE 95H

OPTIONAL:
TYPE 112 RESTRICTOR

TYPE Y600AM

M1008

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
PILOT SUPPLY PRESSURE

FIXED RESTRICTOR

Type 1098-EGR with type y600AM pilot and type 95h pressure supply regulator

Figure 2. Operational Schematics (continued)

5

Bulletin 71.2:1098-EGR
pressure on the actuator diaphragm escapes downstream
through the bleed hole (Type 6351 pilot), bleed orifice
(61 Series pilot), restriction (Types 6352 through
6354M pilots) or fixed restrictor (Type Y600AM pilot).
Reduced actuator loading pressure permits the main
valve to close. The combination of main valve spring
force and valve plug unbalance provides positive valve
plug shutoff against the port and upper seals.
To protect the Type 1098 or 1098H actuator diaphragm
from excessive differential pressure, the 6300 Series
pilots have a relief valve that allows loading pressure
to bleed downstream at approximately 25 psig / 1.7 bar
differential across the actuator diaphragm. An external
relief valve (Type 1806) is required when differential
is higher than 25 psid / 1.7 bar d or when using the
61 Series or Y600AM pilots.

Installation
On the Type EGR main valve, normal pressure drop
assists shutoff. Therefore, leakage may result during
any reverse pressure drop condition. The regulator
may be installed in any position. The normal mounting
position is with the pilot mounted to the right of the
main valve when looking downstream; however, the
pilot may be moved to the left side. Control and supply
lines necessary for installation are not supplied with
the regulator.
In some cases, good piping practice will require that
outlet piping be swaged up above the body size to
prevent excessive pressure drop along the outlet line.
The piping should be as close to the regulator outlet
size as possible.

Construction Features
Pilots for Application Versatility
The balanced valve plug in the Types 6352, 6353
and 6354 pilots provides fast closing action when
quick response is required and also minimizes outlet
pressure changes due to varying supply pressures.
A tapped spring case with gasketed closing cap is
standard for remote venting or for pressure loading
applications involving differential pressure control
or remote pneumatic adjustment of the downstream
pressure setting.

6

The Y600AM and 61 Series pilots provide the
option for low setpoints and improved accuracy. The
61 Series pilot is available in a variety of configurations
to meet your specific application needs – Type 61L
low pressure pilot, Type 61LE low pressure, wide
proportional band pilot, Type 61LD low pressure,
narrow proportional band pilot and the Type 61H
high pressure pilot. These pilots can be configured to
maximize the performance under various application
scenarios. For instance, the 61 Series pilots are
available for fast closing, fast opening or monitor
applications. Refer to Bulletin 71.8:61 for specifics.

Boiler Fuel Pressure Control
To enhance proper operation and adequate
response to negative pressure shock condition in low
differential pressure boiler fuel control applications,
use the Type 1098-EGR boiler fuel configuration:
Type 1098‑EGR with Yellow Main Spring, Quick
Opening Cage, Type 6352 pilot, Size 70 Actuator and
Type Y600AM or 627M Auxiliary Pilot mounted in
parallel with the Type 6352 pilot.
To provide faster response, two pilots mounted
in parallel sense the downstream pressure. The
Type 6352 pilot is the primary controlling pilot and the
Type Y600AM or 627M auxiliary pilot stands by until
it senses a negative pressure shock condition. The
auxiliary pilot opens, allowing additional flow into the
actuator, increasing the stroking speed and providing
faster response. See Figure 5 for schematic.
The quick opening cage allows maximum capacity at
shorter travels to decrease stroking time in opening
and closing directions. The Yellow Main Spring
requires that service conditions not exceed 20 psig /
1.4 bar maximum inlet pressure and 10 psi / 0.69 bar
maximum differential pressure.
Supply the boiler pilot light gas with the Type 1098-EGR.
The pilot light gas supply line should branch off the main
fuel line downstream of the Type 1098-EGR and include
a separate regulator to control the final pilot light gas
pressure, if required (see Figures 5 and 6). This allows
the Type 1098-EGR to have its main valve plug just off
the seat waiting for the sudden negative shock created
when the boiler solenoid valve is opened to light the
boiler to the high fire load. This configuration significantly
increases the stroking speed of the Type 1098-EGR.

Bulletin 71.2:1098-EGR
Table 2. Outlet Pressure Ranges
outlet (control) pressure range
psig
bar
3 to 20
0.2 to 1.4
5 to 35
0.3 to 2.4
35 to 100
2.4 to 6.9
14 in. w.c. to 2 psig
35 mbar to 0.1 bar
2 to 10
0.1 to 0.7
3 to 40
0.2 to 2.8
35 to 125
2.4 to 8.6
85 to 200
5.9 to 13.8
175 to 220
12.1 to 15.2
200 to 300
13.8 to 20.7
7 in. w.c. to 2 psig
17 mbar to 0.1 bar
1 to 5
0.07 to 0.3
2 to 10
0.1 to 0.7
5 to 15
0.3 to 1.0
10 to 20
0.7 to 1.4
10 to 65
0.7 to 4.5
15 to 45
1.0 to 3.1
35 to 100
2.4 to 6.9
100 to 300
6.9 to 20.7
4 to 8 in. w.c.
10 to 20 mbar
7 to 16 in. w.c.
17 to 4 mbar
15 in. w.c. to 1.2 psig
37 mbar to 0.08 bar
1.2 to 2.5
0.08 to 0.17
2.5 to 4.5
0.17 to 0.31
0.31 to 0.48
4.5 to 7

pilot type
6351
6352
6353
6354L(1)
6354M(2)
6354H(2)
61L
61LD
61LE
61H
61HP

Y600AM

spring Color

Spring Part Number

Green
Unpainted
Red
Yellow
Black
Yellow
Red
Blue
Blue
Green
Red
Yellow
Blue
Brown
Green
Green Stripe
Yellow
Blue
Red
Red
Unpainted
Yellow
Green
Light Blue
Black

1B986027212
1B788327022
1K748527202
14A9672X012
14A9673X012
1E392527022
1K748527202
1L346127142
1L346127142
15A9258X012
1B886327022
1J857827022
1B886427022
1J857927142
1B886527022
0Y066427022
1E392527022
1D387227022
1D465127142
1B653827052
1B653927022
1B537027052
1B537127022
1B537227022
1B537327052

1. Without diaphragm limiter.
2. With diaphragm limiter.

Table 3. Actuator Sizes and Maximum Pressures
Actuator Type

Outlet control pressure
psig
bar
100
6.9
75
5.2
50
3.4
350
24.1

Actuator Size
30
40 (standard)
70
30

1098
1098H

Emergency casing pressure
psig
bar
115
7.9
82
5.6
65
4.5
400
27.6

Table 4. Maximum and Minimum Differential Pressures for Main Valve Selection
BODY SIZE
NPS

DN

SPRING PART
NUMBER

Spring 
color

Maximum allowable 
differential pressure(1)

minimum differential pressure 
requireD For full Stroke
Size 30 Actuator
Size 40 Actuator
Size 70 Actuator
psig
bar
psig
bar
psig
bar
3.5
0.24
2.5
0.17
1
0.07
5
0.34
3
0.21
1.5
0.10
7
0.48
5
0.34
2.5
0.17
------2
0.14
1
0.07
4
0.28
3
0.21
1.5
0.10
6
0.41
5
0.34
2
0.14
11
0.76
10
0.69
3
0.21
------2.5
0.17
1
0.07
5
0.34
4
0.28
2
0.14
8
0.55
6
0.41
2.5
0.17
14
0.97
11
0.76
4
0.28
------3.5
0.25
1.3
0.09
10
0.69
5
0.34
2.5
0.17
13
0.90
8
0.55
3
0.21
22
1.5
13
0.90
5
0.34
------6
0.42
2.2
0.15
13
0.90
9.5
0.66
4
0.28
19
1.3
14
0.97
6
0.41
28(2)
1.9
19
1.3
8
0.55

psig
bar
14A9687X012  
Green
60
4.1
1
25
14A9680X012  
Blue
125
8.6
14A9679X012  
Red
400(3)
27.6(3)
14A6768X012  
Yellow
20
1.4
14A6626X012  
Green
60
4.1
2
50
14A6627X012  
Blue
125
8.6
14A6628X012  
Red
400(3)
27.6(3)
14A6771X012  
Yellow
20
1.4
14A6629X012  
Green
60
4.1
3
80
14A6630X012  
Blue
125
8.6
14A6631X012  
Red
400(3)
27.6(3)
14A6770X012  
Yellow
20
1.4
14A6632X012  
Green
60
4.1
4
100
14A6633X012  
Blue
125
8.6
14A6634X012  
Red
400(3)
27.6(3)
15A2253X012  
Yellow
20
1.4
14A9686X012  
Green
60
4.1
6, 8 x 6
150, 200 x 150
and 12 x 6
and 300 x 150
14A9685X012  
Blue
125
8.6
15A2615X012  
Red
400(3)
27.6(3)
1. Maximum inlet pressure is equal to set pressure plus maximum differential.
2. Requires special 6300 Series pilot construction without integral relief valve and with external Type 1806 40 psid / 2.8 bar d relief valve.
3. Should not exceed the body rating limit. Use this pressure value or the body rating limit, whichever is lower.

7

Bulletin 71.2:1098-EGR
Table 5. Supply Pressure Settings Required for the Type 95H Regulator
SUPPLY PRESSURE

BODY SIZE
NPS

DN

Type Y600AM Spring Color

TYPE EGR
SPRING COLOR

Red

Unpainted

Yellow

Green

Light Blue

Black

psig

bar

psig

bar

psig

bar

psig

bar

psig

bar

psig

bar

6
7
8

0.41
0.48
0.55

6
7
8

0.41
0.48
0.55

7
8
9

0.48
0.55
0.62

8
10
11

0.55
0.69
0.76

11
13
14

0.76
0.90
0.97

13
14
15

0.90
0.97
1.0

1

25

Green
Blue
Red

2

50

Green
Blue
Red

6
8
13

0.41
0.55
0.90

6
8
13

0.41
0.55
0.90

7
9
14

0.48
0.62
0.97

9
11
16

0.62
0.76
1.1

12
14
19

0.83
0.97
1.3

13
15
20

0.90
1.0
1.4

3

80

Green
Blue
Red

7
9
14

0.48
0.62
0.97

7
9
14

0.48
0.62
0.97

8
10
15

0.55
0.69
1.0

10
12
17

0.69
0.83
1.2

13
15
20

0.90
1.0
1.4

14
16
21

0.97
1.1
1.5

4

100

Green
Blue
Red

8
11
16

0.55
0.76
1.1

8
11
16

0.55
0.76
1.1

9
12
17

0.62
0.83
1.2

11
14
19

0.76
0.97
1.3

14
17
22

0.97
1.2
1.5

15
18
23

1.0
1.2
1.6

6 or 8 x 6

150 or
200 x 150

Green
Blue
Red

13
17
22

0.90
1.2
1.5

13
17
22

0.90
1.2
1.5

14
18
23

0.97
1.2
1.6

15
20
25

1.0
1.4
1.7

18
23
28

1.2
1.6
1.9

20
24
29

1.4
1.7
2.0

1. The pressures shown in the table are the minimum supply pressures required by the pilot. If the inlet pressure is less than shown, an external pilot supply is necessary.

Protection from Foreign Material
The standard brass Type P594-1 filter or aluminum
Type P593-1 filter in the pilot inlet connection has
a replaceable cellulose filter element. A Type 252
filter is recommended for heavy amounts of foreign
material in the lines. These filters are described in
separate bulletins.

Noise Abatement Trim
At elevated pressure drops and flow rates regulators
with standard trims can produce noise levels that
exceed regulatory limits, causing a nuisance for
neighbors and even causing mechanical damage
to equipment and piping. Whisper Trim™ Cages are
available with the Type 1098-EGR to reduce noise be
up to 30 dBA.

Applications
Low Pressure Gas Distribution Systems
The Type 1098-EGR offers superior performance
when utilized to supply low pressure (typically 4 to
12 in. w.c. / 10 to 30 mbar) at district stations operated

8

by gas distribution companies. The two path control
system (outlet pressure by control pilot) allows for tight
control over the large range of flows typical to district
stations. The knife-edged seats in the main valve plug
allow for tight shutoff and the cage-guided metal plug
aids in stability. Droop can be reduced to a minimum
by utilizing an application specific pilot control
system, main valve spring and actuator combination
(for example, a low droop system would utilize the
95 Series Pilot supplying a Type Y600AM control
pilot, size 70 actuator, a fixed restrictor or the Type 112
variable restrictor set at 3 and the smallest appropriate
main valve spring).

Monitoring Systems
Monitoring regulators serve as overpressure protection
devices to limit system pressure in the event of open
failure of a working regulator feeding the system.
Two methods of using Type 1098-EGR regulators in
monitoring systems are as follows:

NLET PRESSURE

Bulletin 71.2:1098-EGR

6350 SERIES PILOT

6350 SERIES PILOT

TYPE Y600M OR 627-109
MONITORING PILOT

6350 SERIES PILOT

6350 SERIES PILOT

TYPE Y600M OR 627-109
MONITORING PILOT
A6788

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
INTERMEDIATE PRESSURE

Figure 3. Working Monitor System

OUTLET PRESSURE

ATMOSPHERIC PRESSURE
Table

LOADING PRESSURE

6. Working Monitor Performance
MONITORING PILOT INFORMATION

NTERMEDIATE PRESSURE

Spring Part Number

MINIMUM PRESSURE AT WHICH
WORKING MONITOR REGULATOR
CAN BE SET

7 to 30 mbar
27 to 62 mbar

1B653927022
1B537027052

3 in. w.c. / 7 mbar over
normal distribution pressure

25 in. w.c. to 2.5 psi
2.5 to 4.5 psi
4.5 to 7 psi

62 mbar to 0.17 bar
0.17 to 0.31
0.31 to 0.4

1B537127022
1B537227022
1B537327052

14 in. w.c. / 34 mbar over
normal distribution pressure

5 to 20
15 to 40
35 to 80

0.34 to 1.4
1.0 to 2.8
2.4 to 5.5

10B3076X012
10B3077X012
10B3078X012

3.0 psig / 0.21 bar over
normal distribution pressure

70 to 150
130 to 200

4.8 to 10.3
9.0 to 13.8

10B3079X012

5.0 psig / 0.34 bar over
normal distribution pressure

Spring Range

Construction
Type 161AYW pilot and 150 psig /
10.3 bar maximum allowable
pilot inlet pressure

psig

bar

3 to 12 in. w.c.
11 to 25 in. w.c.

Type 627-109 pilot and 150 psig /
10.3 bar maximum allowable pilot
inlet pressure for cast iron body
or 750 psig / 51.7 bar maximum
allowable pilot inlet pressure for
malleable iron or steel body

Working Monitor (Figure 3)
On a working monitor installation, the working monitor
regulator is always upstream and acts as a first-stage
regulator through the working pilot during normal
operation. This arrangement allows the working
monitor’s performance to be observed at all times.
If the second-stage regulator fails to open, the working
monitor regulator assumes the entire pressure
reduction function of the system via the monitoring
pilot. Note that the working monitor regulator actuator
must be able to withstand full inlet pressure or be
protected from it if the working monitor fails wide-open.

The monitoring pilot must be upstream of the working
monitor regulator. This enables a close setpoint
between the working regulator and the monitoring pilot.
Special Types 161AYW and 627-109 monitoring pilots
with quick-bleed operation have been designed to give
faster response to abnormal downstream conditions.
Table 6 gives the spread between normal distribution
pressure and the minimum pressure at which the
working monitor regulator can be set to take over if the
working regulator fails open.

9

1098-EGR Upstream or Downstream “Wide-Open” Moni
Bulletin 71.2:1098-EGR
PILOT SUPPLY REGULATOR

6350 SERIES PILOT

6350 SERIES PILOT

6350 SERIES PILOT

INLET PRESSURE
OUTLET PRESSURE
LOADING PRESSURE
MONITOR LOADING PRESSURE
ATMOSPHERIC PRESSURE
INTERMEDIATE PRESSURE

SSURE

ADING PRESSURE

6350 SERIES PILOT

A6789

URE

ESSURE

PILOT SUPPLY REGULATOR

Figure 4. Wide-Open Monitor System

C PRESSURE

E PRESSURE

Wide-Open Monitor (Figure 4)
Either the upstream or downstream regulator can be
the monitoring regulator. During normal operation, the
monitoring regulator is standing wide-open with the
reduction to distribution pressure being taken across
the working regulator. Only in case of open failure of
the working regulator does the wide-open monitoring
regulator take control at its slightly higher setting.
Regardless of which regulator is used as the monitor,
it should be equipped with a pilot supply regulator
set to limit the pilot supply pressure to 10 to 15 psig /
0.69 to 1.0 bar above control pressure. Since the
pilot on the monitoring regulator is wide-open during
normal operation, the pilot supply regulator prevents
differential relief valve chatter on the monitoring
regulator pilot.

Adjustment Recommendations for
Monitor Applications
Low amplitude/high frequency monitor trim oscillations
can occur if the monitor regulator pressure setting is
adjusted too closely to the working regulator pressure

10

setting and/or if the monitor pilot supply regulator
pressure setting is adjusted too closely to the monitor
regulator pressure setting. The monitor pressure
setting should be adjusted so it is at minimum 2 times
the pilot proportional band pressure above the working
regulator pressure setting. The monitor pilot supply
pressure setting should be adjusted so it is at minimum
5 psig / 0.34 bar plus the monitor minimum differential
pressure above the working regulator pressure setting.
These adjustments must be made such that other
governing pressure limits, such as casing ratings, pilot
maximum differential pressures or regulatory limits,
are not exceeded.

Water Service
When using the Type 1098-EGR in aqueous service,
it is important to make the proper material and pilot
selections. Table 9 shows proper material selections
for erosive or corrosive service. In both cases, a low
gain pilot should be used on any aqueous service.
The low gain pilot improves the speed of response
of the regulator in aqueous applications. Follow
all general procedures when operating the
Type 1098-EGR in aqueous service.

Bulletin 71.2:1098-EGR
type 1098-egr 
size 70 with 
quick opening 
cage and yellow 
main spring

20 psi / 1.4 bar maximum

to burner pilot

to main burner

type 6352
working pilot

Type Y600AM
auxiliary pilot

E0711

Figure 5. Boiler Fuel Configuration

11

Bulletin 71.2:1098-EGR
safety 
shutoff valve

gas
supply

to boiler

fast-acting
load valve

type 1098-EGR
pilot 
gas
Supply

E0710

pilot gas
regulator

to pilot light

Figure 6. Boiler Fuel Configuration Installation Guide

bleed valve
(NORMALLY CLOSED)

Block valve
(normally OPEN)

type 1098-egr
main valve

S

E0712

Figure 7. Fast-Closing Application Installation Guide

12

solenoid valve
(normally CLOSED)

Block valve
(normally OPEN)

Bulletin 71.2:1098-EGR
Table 7. Auxiliary Pilot Selection (Fast Stroke Dual Pilot)
SIZE

CONSTRUCTION

SPRING RANGE

ORIFICE,
In. / mm

Type Y600AM
3/4 NPT

1/4 / 6.4

SPRING
NUMBER

MINIMUM PRESSURE
AT WHICH AUXILIARY
PILOT CAN BE SET

SPRING
COLOR

psi

bar

4 to 8 in. w.c.

10 to 20 mbar

1B653827052

Red

7 to 16 in. w.c.

17 to 40 mbar

1B653927022

Unpainted

15 in. w.c. to 1.2 psi

37 mbar to 0.08 bar

1B537027052

Yellow

1.2 to 2.5

0.08 to 0.17

1B537127022

Green

2.5 to 4.5

0.17 to 0.31

1B537227022

Light Blue

4.5 to 7

0.31 to 0.48

1B537327052

Black

5 to 10

0.34 to 0.69

10B3076X012

Yellow

Type 627M

1 in. w.c. / 2 mbar
Under working
pilot setpoint
6 in. w.c / 14 mbar
Under working
pilot setpoint
8 in. w.c / 21 mbar
Under working
pilot setpoint

Table 8. Boiler Fuel Pressure Control Construction Selections
TYPE EGR BODY SIZE
NPS

DN

QUICK-OPENING
CAGE PART NUMBER(1)

YELLOW MAIN SPRING
PART NUMBER(2)

1

25

37A7211X012

-----------

2

50

37A7212X012

14A6768X012

3

80

37A7213X012

14A6771X012

4

100

37A7214X012

6, 8 x 6 and 12 x 6

150, 200 x 150 and 300 x 150

37A7215X022

MINIMUM DIFFERENTIAL PRESSURE
FOR FULL STROKE(3)
psi

bar
----

1

0.07

14A6770X012

1.3

0.09

15A2253X012

2.2

0.15

1. Limited to maximum P1 of 20 psig / 1.4 bar.
2. Yellow spring is limited to use with Size 70 actuator only.
3. Minimum differential pressure for full stroke is based on yellow main spring and a Size 70 actuator.

Table 9. Construction Materials for Aqueous Service
Aqueous Service Type

Construction Material
Cage and Seat Ring

Erosive

416 Stainless steel

Corrosive

316 Stainless steel

Body Flange

Main Spring

CF8M Stainless steel

Inconel® X-750

1. A low gain pilot should be used on aqueous applications.

Fast Closing Regulator (Figure 7)
When a Type 1098-EGR regulator is used upstream
of a double block and bleed system, it is sometimes
necessary to modify the Type 1098-EGR control
system to increase the closing speed.
A solenoid can be installed as shown in Figure 7. In
normal operation, the solenoid valve is closed. The
solenoid wiring is connected to the block valve electric
logic so that the solenoid on the regulator opens when
the block valve is closed.

This concept will quickly equalize pressure on both
sides of the Type 1098 diaphragm and allow quick
closure. In some systems, the Type 1098-EGR will
close faster than the block valve as evidenced by
a momentary decline in the Type 1098-EGR outlet
pressure. The pressure is then promptly restored
back to a setpoint by flow through the pilot only
(i.e., the main valve is unable to open because of the
solenoid valve).

Inconel® is a mark owned by Special Metals Corporation.

13

Bulletin 71.2:1098-EGR
Capacity Information
Note
Flow capacities are laboratory
verified; therefore, regulators may
be sized for 100% of the published
flow capacities. It is not necessary to
reduce published capacities.

For pressure drops lower than critical (absolute outlet
pressure greater than one-half of absolute inlet pressure).
Cg =

520
GT

CgP1SIN

)

3417
C1

)

DEG

where,
      Q  =  gas flow rate, scfh
      G  =  gas specific gravity of the gas

Gases
Table 12 shows the natural gas regulating capacities
of the Type 1098-EGR at selected inlet and outlet
pressure settings. Flows are in thousands of scfh at
60°F and 14.7 psia and in thousands of Nm3/h at 0°C
and 1.01325 bar of 0.6 specific gravity natural gas.
To determine equivalent capacities for air, propane,
butane or nitrogen, multiply the capacity by the
following appropriate conversion factor: 0.775 for
air, 0.628 for propane, 0.548 for butane or 0.789 for
nitrogen. For gases of other specific gravities, multiply
the given capacity by 0.775 and divide by the square
root of the appropriate specific gravity.
To find appropriate regulating capacities at pressure
settings not given in Table 12 or to find wide-open
flow capacities for relief sizing at any inlet pressure,
perform one of the following procedures. Then, if
necessary, convert using the factors provided above.

      T  =  absolute temperature of gas at inlet, °Rankine
   Cg  =  gas sizing coefficient
   P1  =  absolute inlet pressure, psia
                (P1 gauge + 14.7)
   C1  =  flow coefficient
   ∆P =  pressure drop across the regulator, psi
Then, if capacity is desired in normal cubic meters
per hour (Nm3/h) at 0°C and 1.01325 bar, multiply
scfh by 0.0268.

Liquids
The liquid capacities in Table 13 are in gallons per
minute and liters per minute of water. To determine
flow capacity not given, use the following equation:

For critical pressure drops (absolute outlet pressure
equal to or less than one-half of absolute inlet
pressure), use the following formula:
Q = (P1)(Cg)(1.29)

Q = Cv

∆P
G

where,

where,

      Q    =  liquid flow rate, gpm

    Q  =  gas flow rate, scfh

   Cv   =  liquid sizing coefficient

  P1  =  absolute inlet pressure, psia (P1 gauge + 14.7)
  Cg  =  regulating or wide-open gas sizing coefficient
              from Table 14, 15 or 16
Then, if capacity is desired in normal cubic meters per
hour at 0°C and 1.01325 bar, multiply scfh by 0.0268.

14

∆P
P1

   ∆P  =  pressure drop across the regulator, psi
      G   =  specific gravity (specific gravity of water is 1)
If capacity is desired in liters per minute, multiply
gallons per minute by 3.785. Use the Km values to
predict choked flow on aqueous service.

Bulletin 71.2:1098-EGR
Table 10. Proportional Band (Standard Pilot Restriction and Size 40 Type 1098 Actuator(1))
pilot

body Size
NPS

DN

Type

6351
6352
6353
1

25

61L
61LD
61LE, 61H and 61HP

Y600AM(2)

6351
6352
6353
2

50

61L
61LD
61LE, 61H and 61HP

Y600AM(2)

6351
6352
6353
3

80

proportional band
Control Spring Color
Green
Unpainted
Red
Yellow
Black
Yellow
Red
All
Red
Unpainted
Yellow
Green
Light Blue
Black
Green
Unpainted
Red
Yellow
Black
Yellow
Red
All
Red
Unpainted
Yellow
Green
Light Blue
Black
Green
Unpainted
Red
Yellow
Black
Yellow
Red

61L
61LD
61LE, 61H and 61HP

All

Y600AM(2)

Red
Unpainted
Yellow
Light Green
Light Blue
Black

Yellow or Green
Main Valve Spring
psi
mbar
0.10
7
0.20
14
0.40
28
0.04
3
0.08
6
0.20
14
0.40
28
0.09
6
0.04
3
0.40
28
0.01
0.6
0.01
0.6
0.05
3
0.10
7
0.15
10
0.20
14
0.20
14
0.30
21
0.50
34
0.05
3
0.10
7
0.30
21
0.50
34
0.10
7
0.05
3
0.50
34
0.01
0.6
0.01
0.6
0.05
4
0.10
7
0.15
10
0.20
14
0.30
21
0.40
28
0.90
62
0.10
7
0.20
14
0.40
28
0.90
62
0.20
14
0.10
7
0.90
62
0.01
0.6
0.01
0.6
0.05
4
0.10
7
0.15
10
0.20
14

Blue
Main Valve Spring
psi
mbar
0.20
14
0.40
28
0.80
55
0.10
7
0.20
14
0.40
28
0.80
55
0.16
11
0.08
6
0.80
55
0.02
1
0.02
1
0.10
7
0.15
10
0.20
14
0.25
17
0.30
21
0.50
34
1
69
0.15
10
0.30
21
0.50
34
1
69
0.20
14
0.10
7
1
69
0.02
1
0.02
1
0.10
7
0.15
10
0.20
14
0.25
17
0.40
28
0.60
41
1.20
83
0.20
14
0.40
28
0.60
41
1.20
83
0.40
28
0.20
14
1.20
83
0.02
1
0.02
1
0.10
7
0.15
10
0.20
14
0.25
17

Red
Main Valve Spring
psi
mbar
0.40
28
0.80
55
1
69
0.20
14
0.40
28
0.80
55
1
69
0.30
21
0.20
14
1
69
0.04
3
0.04
3
0.15
10
0.20
14
0.25
17
0.30
21
0.50
34
1
69
1.40
97
0.30
21
0.60
41
1
69
1.40
97
0.60
41
0.30
21
1.40
97
0.04
3
0.04
3
0.15
10
0.20
14
0.25
17
0.30
21
0.60
41
1.20
83
1.50
103
0.40
27.6
0.80
55.2
1.20
82.8
1.50
103
1
69.0
0.50
34.5
1.50
103
0.04
3
0.04
3
0.15
10
0.20
14
0.25
17
0.30
21

1. For other combinations, multiply table values by 1.6 for a size 30 actuator, 0.4 for a size 70 actuator, 2.0 for a low-gain Type 6352 or 6353 pilot restriction and 0.5 for a high-gain
Type 6352 or 6353 pilot restriction. For instance, a standard NPS 2 / DN 50 Type 1098-EGR-6352 regulator with black pilot control spring and blue main valve spring has a proportional
band of 0.3 psi / 0.021 bar as given in the table, but this same regulator with low-gain restriction and size 70 actuator has a proportional band of 0.3 psi / 0.021 bar x 2.0 x 0.4 =
0.24 psi / 0.017 bar.
2. The configuration utilized in determining the proportional band of the Type Y600AM included the 95 Series pilot supplying the Type Y600AM for improved stability and a fixed restrictor,
part number 1K9484X0022 or an optional Type 112 variable restrictor with a setting of 3.

- continued -

15

Bulletin 71.2:1098-EGR
Table 10. Proportional Band (Standard Pilot Restriction and Size 40 Type 1098 Actuator(1)) (continued)
pilot
body Size

Control Spring
Color

Type
NPS

proportional band

DN

Green
Unpainted
Red
Yellow
Black
Yellow
Red

6351
6352
6353
4

100

61L
61LD
61LE, 61H and 61HP

Red
Unpainted
Yellow
Green
Light Blue
Black
Green
Unpainted
Red
Yellow
Black
Yellow
Red

Y600AM(2)

6351
6352
6353
6, 8 x 6 and
12 x 6

150, 200 x 150
and 300 x 150

All

61L
61LD
61LE, 61H and 61HP

All

Y600AM(2)

Red
Unpainted
Yellow
Green
Light Blue
Black

Yellow or Green
Main Valve Spring

Blue
Main Valve Spring

Red
Main Valve Spring

psi

mbar

psi

mbar

psi

mbar

0.40
0.70
1.20
0.15
0.30
0.70
1.20
0.30
0.15
1.20
0.01
0.01
0.05
0.10
0.15
0.20
0.50
0.90
1.50
0.20
0.40
0.90
1.50
0.60
0.30
1.50
0.01
0.01
0.05
0.05
0.15
0.20

28
48
83
10
21
48
83
21
10
83
0.6
0.6
3
7
10
14
34
62
103
14
28
62
103
41
21
103
0.6
0.6
3
3
10
14

0.50
0.80
2.00
0.30
0.60
0.80
2.00
0.60
0.30
2.00
0.02
0.02
0.10
0.15
0.20
0.25
0.60
1.50
2.50
0.40
0.80
1.50
2.50
1.20
0.60
2.50
0.02
0.02
0.10
0.15
0.20
0.25

34
55
138
21
41
55
138
41
21
138
1
1
7
10
14
17
41
103
172
28
55
103
172
83
41
172
1
1
7
10
14
17

0.80
1.40
3.00
0.60
1.20
1.40
3.00
1.40
0.70
3.00
0.04
0.04
0.15
0.20
0.25
0.30
1.00
2.00
3.50
0.80
1.60
2.00
3.50
2.00
2.00
3.50
0.04
0.04
0.15
0.20
0.25
0.30

55
97
207
41
83
97
207
97
48
207
3
3
10
14
17
21
69
138
241
55
110
138
241
138
69
241
3
3
10
14
17
21

1. For other combinations, multiply table values by 1.6 for a size 30 actuator, 0.4 for a size 70 actuator, 2.0 for a low-gain Type 6352 or 6353 pilot restriction and 0.5 for a high-gain
Type 6352 or 6353 pilot restriction. For instance, a standard NPS 2 / DN 50 Type 1098-EGR-6352 regulator with black pilot control spring and blue main valve spring has a proportional
band of 0.3 psi / 0.021 bar as given in the table, but this same regulator with low-gain restriction and size 70 actuator has a proportional band of 0.3 psi / 0.021 bar x 2.0 x 0.4 =
0.24 psi / 0.017 bar.
2. The configuration utilized in determining the proportional band of the Type Y600AM included the 95 Series pilot supplying the Type Y600AM for improved stability and a fixed
restrictor, part number 1K9484X0022 or an optional Type 112 variable restrictor with a setting of 3.

Table 11. Approximate Proportional Band Range (Standard Pilot Restriction, Size 30 Type 1098H Actuator(1))
pilot
body Size
Type

approximate proportional band range
Control Spring
Color

Green Main
Valve Spring

Blue Main
Valve Spring

Red Main
Valve Spring

NPS

DN

psi

bar

psi

bar

psi

bar

1

25

1

0.07

1.5

0.10

2.5

0.17

2

50

1.5

0.10

2.0

0.14

3.0

0.21

3

80

4

100

6, 8 x 6
or 12 x 6

150, 200 x 150
or 300 x 150

6354L, 6354M or
6354H

Blue or Green

2.5

0.17

3.0

0.21

4.0

0.28

3.5

0.24

4.0

0.28

5.0

0.34

4

0.28

5.0

0.34

Not Available

1. For other restrictions, multiply table values by 2.0 for a low-gain restriction or by 0.5 for a high gain restriction. For instance, a standard NPS 2 / DN 50 Type 1098H-EGR-6354L
regulator with blue control spring and blue main valve spring has a proportional band of 2.0 psi / 0.14 bar as given in the table. But this same regulator with low-gain restriction has a
proportional band of 2.0 psi / 0.14 bar x 2.0 = 4.0 psi / 0.28 bar.

16

Bulletin 71.2:1098-EGR
Table 12. Natural Gas Capacities

INLET
PRESSURE

OUTLET
PRESSURE
SETTING

CAPACITIES IN THOUSANDS OF SCFH / Nm3/h of 0.6 SPECIFIC GRAVITY natural GAS
FOR REGULATORS WITH STANDARD LINEAR CAGE, STANDARD TRAVEL
AND LINE SIZE EQUALS MAIN VALVE BODY SIZE
NPS 1 /  
DN 25
Body Size

NPS 2 /
DN 50
Body Size

NPS 3 /
DN 80
Body Size

NPS 4 /
DN 100
Body Size

NPS 6 /
DN 150
Body Size

NPS 8 x 6 /
DN 200 x 150
Body Size

NPS 12 x 6 /
DN 300 x 150
Body Size

SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h SCFH Nm3/h

psig

bar

psig

bar

3

0.21

7 in. w.c.

17 mbar

8

0.2

32

0.9

66

1.8

101

2.7

----

----

----

----

----

----

5

0.34

7 in. w.c.
1
2

17 mbar
0.07
0.1

11
10
9

0.3
0.3
0.2

42
39
35

1.1
1.0
0.9

87
82
73

2.3
2.2
2.0

135
126
112

3.6
3.4
3.0

257
241
----

6.9
6.5
----

372
350
----

10.0
9.4
----

427
401
----

11.4
10.7

10

0.69

7 in. w.c.
3
5
7

17 mbar
0.2
0.3
0.5

17
15
13
11

0.5
0.4
0.4
0.3

63
56
49
40

1.7
1.5
1.3
1.1

129
116
102
82

3.5
3.1
2.7
2.2

201
180
158
127

5.4
4.8
4.2
3.4

376
341
302
----

10.1
9.1
8.1
----

542
493
438
----

14.5
13.2
11.7
----

622
565
502
----

1
4
8
12

0.07
0.3
0.5
0.8

21
20
17
12

0.6
0.5
0.5
0.3

79
74
63
44

2.1
2.0
1.7
1.2

163
153
130
91

4.4
4.1
3.5
2.4

254
237
201
140

6.8
6.4
5.4
3.8

471
445
385
----

12.6
11.9
10.3
----

678
642
557
----

18.2
17.2
14.9
----

777
735
638
----

1.4

1
10
15
17

0.07
0.7
1.0
1.2

27
21
16
13

0.7
0.6
0.4
0.4

102
79
60
48

2.7
2.1
1.6
1.3

207
164
125
99

5.6
4.4
3.4
2.7

328
254
192
153

8.8
6.8
5.2
4.1

577
482
371
----

15.5
12.9
9.9
----

827
696
538
----

22.1
18.7
14.4
----

948
798
616
----

----

30

2.1

4
15
20
25

0.3 or less
1.0
1.4
1.7

35
29
25
18

0.9
0.8
0.7
0.5

131
108
93
69

3.5
2.9
2.5
1.6

267
223
192
144

7.2
6.0
5.2
3.9

422
345
297
221

11.3
9.3
8.0
5.9

744
651
568
429

19.9
17.5
15.2
11.5

1066
940
822
622

28.6
25.2
22.0
16.7

1221
1077
942
713

32.7
28.9
25.2
19.1

40

2.8

9
20
30
35

0.6 or less
1.4
2.1
2.4

42
36
28
21

1.1
1.0
0.8
0.6

161
136
105
77

4.3
3.6
2.8
2.1

327
280
217
161

8.8
7.5
5.8
4.3

517
434
335
247

13.9
11.6
9.0
6.6

910
816
644
480

24.4
21.9
17.3
12.9

1304
1178
933
697

34.9
31.6
25.0
18.7

1495
1350
1069
798

40.1
36.2
28.6
21.4

50

3.4

13
20
30
40
45

0.9 or less
1.4
2.1
2.8
3.1

50
45
40
31
22

1.3
1.2
1.1
0.8
0.6

190
172
152
115
85

5.1
4.6
4.1
3.1
2.3

386
354
313
240
176

10.3
9.5
8.4
6.4
4.7

611
551
485
369
270

16.4
14.8
13.0
9.9
7.24

1077
1023
919
712
526

28.9
27.4
24.6
19.1
14.1

1542
1473
1327
1032
764

41.3
39.5
35.6
27.7
20.5

1768
1688
1521
1182
875

47.4
45.2
40.8
31.7
23.5

75

5.2

24
50
60
70

1.6 or less
3.4
4.1
4.8

69
54
44
27

1.9
1.5
1.2
0.7

264
203
166
101

7.1
5.4
4.5
2.7

536
419
343
209

14.4
11.2
9.2
5.6

847
648
529
322

22.7
17.4
14.2
8.63

1493
1232
1019
627

40.0
33.0
27.3
16.8

2138
1781
1476
911

57.3
47.7
39.6
24.4

2451
2041
1692
1044

65.7
54.7
45.3
28.0

100

6.9

35
60
75

2.4 or less
4.1
5.2

89
74
62

2.4
2.0
1.7

337
280
236

9.0
7.5
6.3

685
578
489

18.4
15.5
13.1

1083
896
754

29.0
24.0
20.2

1909
1689
1444

51.2
45.3
38.7

2734
2438
2090

73.2
65.3
56.0

3134
2794
2396

84.0
74.9
64.2

125

8.6

46
75

3.2 or less
5.2

108
91

2.9
2.4

411
344

11.0
9.2

834
710

22.4
19.0

1319
1101

35.3
29.5

2325
2072

62.3
55.5

3330
2990

89.2
80.1

3817
3427

102
91.8

150

10.3

57
75

3.9 or less
5.2

127
115

3.4
3.1

484
436

13.0
11.7

984
897

26.4
24.0

1555
1396

41.7
37.4

2741
2593

73.5
69.5

3926
3735

105
100

4500
4281

121
115

175

12.1

68

4.7 or less

147

3.9

558

15.0

1133

30.4

1791

48.0

3157

84.6

4522

121

5183

139

200

13.8

166

4.5

631

16.9

1282

34.4

2027

54.3

3573

95.8

5118

137

5866

157

250

17.2

205

5.5

779

20.9

1581

42.4

2500

67.0

4405

118

6310

169

7232

194

15

20

1.0

---16.7
15.1
13.5

---20.8
19.7
17.1

---25.4
21.4
16.5

300

20.7

244

6.5

926

24.8

1880

50.4

2972

79.6

5237

140

7502

201

8598

230

350

24.1

282

7.6

1073

28.8

2178

58.4

3444

92.3

6069

163

8694

234

9964

267

400

27.6

321

8.6

1220

32.7

2477

66.4

3916

105

6901

185

9886

265

11,331

304

75

5.2 or less

17

Bulletin 71.2:1098-EGR
Table 13. Liquid Capacities
INLET
PRESSURE

OUTLET
PRESSURE
SETTING

CAPACITIES IN GPM / l/min of Water
FOR REGULATORS WITH STAINLESS STEEL Linear HOLE CAGE
NPS 1 /
DN 25
Body Size

NPS 2 /  
DN 50
Body Size

NPS 3 /  
DN 80
Body Size

NPS 4 /  
DN 100
Body Size

NPS 6 /  
DN 150
Body Size

NPS 8 x 6 /
DN 200 x 150
Body Size

NPS 12 x 6 /
DN 300 x 150
Body Size

psig

bar

psig

bar

GPM

l/min

GPM

l/min

GPM

l/min

GPM

l/min

GPM

l/min

GPM

l/min

GPM

l/min

3

0.21

0.25

0.02

28

106

105

397

219

829

335

1268

658

2491

959

3630

1098

4156

5

0.34

0.25
1
2

0.02
0.07
0.1

37
34
29

140
129
110

138
127
110

522
481
416

288
264
229

1090
999
867

440
404
350

1665
1529
1325

865
794
688

3274
3005
2604

1260
1156
1001

4769
4375
3789

1443
1324
1147

5462
5011
4342

10

0.69

0.25
3
5
7

0.02
0.2
0.3
0.5

52
44
38
29

197
167
144
110

198
167
142
110

749
632
537
416

412
349
295
229

1559
1321
1117
867

631
534
452
350

2388
2021
1711
1325

1240
1050
888
688

4693
3974
3361
2604

1805
1529
1292
1001

8632
5787
4890
3789

2067
1751
1480
1147

7824
6628
5602
4341

15

1.0

1
4
8
12

0.07
0.3
0.5
0.8

63
56
44
29

238
212
167
110

237
210
167
110

897
795
632
416

494
438
349
229

1870
1658
1321
867

756
670
534
350

2861
2536
2021
1325

1485
1317
1050
688

5621
4985
3974
2604

2163
1917
1529
1001

8187
7256
5787
3789

2477
2196
1751
1147

9375
8312
6628
4341

20

1.4

1
10
15
17

0.07
0.7
1.0
1.2

73
53
38
29

276
201
144
110

276
200
142
110

1045
757
537
416

575
417
295
229

2176
1578
1117
867

880
639
452
350

3331
2419
1711
1325

1730
1255
888
688

6548
4750
3361
2604

2519
1828
1292
1001

9534
6919
4890
3789

2886
2093
1480
1147

10,924
7922
5602
4341

30

2.1

4
15
20
25

0.3 or less
1.0
1.4
1.7

86
65
53
38

326
246
201
144

323
245
200
142

1223
927
757
537

673
511
417
295

2547
1934
1578
1117

1030
782
639
452

3899
2960
2419
1711

2024
1538
1255
888

7661
5821
4750
3361

2947
2239
1828
1292

11,154
8475
6919
4890

3376
2564
2093
1480

12,778
9705
7922
5602

40

2.8

9
20
30
35

0.6 or less
1.4
2.1
2.4

94
75
53
38

356
284
201
144

352
283
200
142

1332
1071
757
537

735
590
417
295

2782
2233
1578
1117

1125
903
639
452

4258
3418
2419
1711

2210
1775
1255
888

8365
6718
4750
3361

3218
2585
1828
1292

12,180
9784
6919
4890

3686
2961
2093
1480

13,952
11,207
7922
5602

50

3.4

13
20
30
40
45

0.9 or less
1.4
2.1
2.8
3.1

102
92
75
53
38

386
348
284
201
144

385
347
283
200
142

1457
1313
1071
757
537

803
723
590
417
295

3039
2737
2233
1578
1117

1229
1106
903
639
452

4652
4186
3418
2419
1711

2415
2174
1775
1255
888

9141
8229
6718
4750
3361

3516
3166
2585
1828
1292

13,308
11,983
9784
6919
4890

4027
3626
2961
2093
1480

15,242
13,724
11,207
7922
5602

75

5.2

24
50
60
70

1.6 or less
3.4
4.1
4.8

120
84
65
38

454
318
246
144

452
317
245
142

1711
1200
927
537

943
660
511
295

3569
2498
1934
1117

1443
1010
782
452

5462
3823
2960
1711

2835
1985
1538
888

10,730
7513
5821
3361

4128
2890
2239
1292

15,624
10,939
8475
4890

4728
3310
2564
1480

17,895
12,528
9705
5602

100

6.9

35
60
75

2.4 or less
4.1
5.2

135
106
84

511
401
318

510
400
317

1930
1514
1200

1064
835
660

4027
3160
2498

1629
1278
1010

6166
4837
3823

3201
2511
1985

12,116
9504
7513

4660
3656
2890

17,638
13,837
10,939

5337
4187
3310

20,201
15,848
12,528

125

8.6

46
75

3.2 or less
5.2

149
119

564
450

563
448

2131
1696

1173
933

4440
3531

1795
1428

6794
5405

3529
2807

13,357
10,624

5137
4087

19,444
15,469

5884
4681

22,271
17,718

150

10.3

57
75

3.9 or less
5.2

162
145

613
549

610
548

2309
2074

1273
1143

4818
4326

1948
1749

7373
6620

3829
3438

14,493
13,013

5574
5006

21,098
18,948

6384
5733

24,163
21,699

175

12.1

68

4.7 or less

174

659

655

2479

1365

5167

2090

7911

4107

15,545

5979

22,630

6848

25,920

200

13.8

188

712

708

2680

1476

5587

2258

8547

4439

16,802

6462

24,459

7401

28,013

250

17.2

222

840

837

3168

1746

6609

2672

10,114

5252

19,879

7646

28,940

8757

33,145

300

20.7

252

954

950

3596

1980

7494

3030

11,469

5955

22,540

8670

32,816

9930

37,585

350

24.1

279

1056

1050

3974

2189

8285

3350

12,680

6584

24,920

9585

36,279 10,978 41,552

400

27.6

303

1147

1141

4319

2380

9008

3642

13,785

7157

27,089 10,420 39,440 11,934 45,170

18

75

5.2 or less

Bulletin 71.2:1098-EGR
Table 14. Flow Coefficients for Type 1098-EGR with Linear Cage
1:1 Line Size to Body Size

body size

Cv

Cg

Regulating Wide-Open Regulating Wide-Open

2:1 Line Size to Body Size
C1

Cg

Km

Cv

XT

NPS

DN

1

25

600

632

16.8

17.7

35.7

568

598

17.2

18.1

2

50

2280

2400

63.3

66.7

36.0

2050

2160

59.6

62.8

3

80

4630

4880

132

139

35.1

4410

4650

128

135

4

100

7320

7710

202

213

36.2

6940

7310

198

209

35.0

0.70 0.829

6

150

12,900

13,600

397

418

32.5

12,100

12,800

381

404

31.7

0.668

8 x 6 200 x 150

18,480

19,450

578

608

17,370

18,280

543

571

12 x 6 300 x 150

21,180

22,290

662

697

19,900

20,950

622

655

32.0

0.648

32.0

Regulating Wide-Open Regulating Wide-Open

C1

IEC Sizing 
Coefficient

33.0

FD

FL

0.806 0.43
0.820 0.35

34.4

0.779 0.30
0.84
0.28

Table 15. Flow Coefficients for Type 1098-EGR with Quick Opening Trim
1:1 Line Size to Body Size

body size

Cv

Cg

C1

Cg

Cv

Km

XT

FD

DN

1

25

769

810

23.9

25.2

32.2

728

766

24.5

25.7

29.8

0.656

2

50

2460

2590

68.3

71.9

36.0

2214

2331

64.4

67.8

34.4

0.820 0.36

3

80

4790

5050

141

149

33.9

4571

4812

137

145

33.3

4

100

8120

8550

229

242

35.4

7701

8106

225

237

34.2

6

150

14,915

15,700

445

469

33.5

14,571

15,350

435

458

33.5

0.710

8x6

200 x 150

33.0

15,410

33.0

0.689

22,470

15,770

25,750

681

478

780

Regulating Wide-Open Regulating Wide-Open

C1

IEC Sizing 
Coefficient

NPS

12 x 6 300 x 150

Regulating Wide-Open Regulating Wide-Open

2:1 Line Size to Body Size

20,100
25,760

609

467

781

FL

0.727
0.70 0.793 0.30 0.84
0.28

Table 16. Flow Coefficients for Type 1098-EGR with Whisper Trim™ Cage
1:1 Line Size to Body Size

body size

Cv

Cg

Regulating Wide-Open Regulating Wide-Open

2:1 Line Size to Body Size
C1

Cg

Km

Cv

Xt

Fd

NPS

DN

1

25

576

607

16.7

17.6

34.5

529

557

15.6

16.4

34.0

0.753 0.10

2

50

1970

2080

54.7

57.8

36.0

1830

1930

52.3

55.1

35.0

0.820 0.07

3

80

3760

3960

107

113

35.0

3630

3830

106

110

34.2

0.775 0.05

4

100

6280

6610

180

190

34.8

6020

6340

171

180

35.2 0.80 0.766 0.04

6

150

32.0

31.7

0.648

35.0

0.775

9450

9950

295

310

8 x 6 200 x 150

10,660

11,220

305

321

12 x 6 300 x 150

11,050

11,630

316

332

35.0

Regulating Wide-Open Regulating Wide-Open

C1

IEC Sizing 
Coefficient

9240

9730

291

306

10,020

10,550

286

301

10,380

10,930

297

312

FL

0.89

0.03

19

Bulletin 71.2:1098-EGR
A
A/2

R

G

1.94 /
49.3
D

H
E

AR (ACTUATOR REMOVAL CLEARANCE)

M

(REMOVAL
CLEARANCE FOR
TRIM PACKAGE)

Z

IN. /
mm
B1113_1_B

Figure 8. Type 1098-EGR Dimensions

20

C

Bulletin 71.2:1098-EGR
Table 17. Dimensions
actuator Dimension
M
C (Diameter)

Type and
Actuator Size

In.

E

mm

In.

H
mm

1098 - 30

11.38

289

5.69

145

1098 - 40

13.12

333

5.75

146

With Pilot Spring
Case Vent

Without Pilot Spring
Case Vent

In.

mm

In.

mm

In.

mm

7.88

200

9.50

241

9.31

236

1098 - 70

21.12

536

7.44

189

14.19

360

15.81

402

15.62

397

1098H - 30

11.38

289

6.06

154

7.88

200

9.50

241

9.31

236

Main Valve Dimension
A

body Size

NPT
Cast Iron,
CL600 RF,
BWE or NPT
Steel and
Stainless
Steel

CL125 FF
Cast Iron or
CL150 RF
Steel and
Stainless
Steel

Z
CL250 RF
Cast Iron or
CL300 RF
Steel and
Stainless
Steel

PN 16/25/40
Steel and
Stainless
Steel

D

G

R

NPS

DN

In.

mm

In.

mm

In.

mm

In.

mm

In.

mm

In.

mm

1

25

8.25

210

7.25

184

7.75

197

7.62

194

3.88

98.6

8.62

219

2

50

11.25

286

10

254

10.5

267

10.19

259

4.56

116

9.12

232

3

80

13.25

337

11.75

298

12.5

317

11.81

300

5.31

135

11.31

287

4

100

15.5

394

13.88

353

14.5

368

13.56

344

6.56

167

12.69

322

6

150

20

508

17.75

451

18.62

473

17.48

444

8.06

205

13.62

346

8x6

200 x
150

24

610

21.4

544

22.4

569

9.76

248

15.02

382

300 x
150

----

----

32.3

12.56

319

17.72

450

12 x 6

820

29

737

30.5

775

In.

Cast Iron

mm

4.06

103

5.06

129

8

203

Steel and
Stainless
Steel

AR

In.

mm

In.

mm

In.

mm

12

305

13.75

349

3

76.2

13.31

338

15.06

383

3.12

79.2

16.5

419

18.25

464

3.88

98.6

19.12

486

21.12

536

5.12

130

20.25

514

23.25

591

6.62

168

Ordering Information

Ordering Guide

Use the Specifications section on pages 2 and 3 and
carefully review the description to the right of each
specification. Use this information to complete the
Ordering Guide on the following page. Specify the
desired selection wherever there is a choice to be
made. Then send the Ordering Guide to your local
Sales Office.

Main Valve Body Size (Select One)
    NPS 1 / DN 25***
    NPS 2 / DN 50***
    NPS 3 / DN 80***
     NPS 4 / DN 100***
    NPS 6 / DN 150***
    NPS 8 x 6 / DN 200 x 150
        (not available in cast iron)***
    NPS 12 x 6 / DN 300 x 150
        (not available in cast iron)***
Main Valve Body Material and
End Connection Style (Select One)
Cast Iron Body
    NPT (1 or 2 NPT only)***
    CL125 FF***
    CL250 RF***
- continued -

21

Bulletin 71.2:1098-EGR
Ordering Guide (continued)
WCC Steel Body
    NPT (1 or 2 NPT only)***
    CL150 RF***	
  SWE (NPS 1 or 2 / DN 25 or 50 only)**
    CL300 RF***
      CL600 RF*	
    Sch 40 BWE
    Sch 80 BWE	
    PN 16/25/40 (Not Available for NPS 8 x 6 or
        12 x 6 / DN 200 x 150 or 300 x 150)*	
        Specify ____________

Actuator and Bonnet Material (Select One)
    Steel casing with steel bonnet***
    Stainless steel casing with stainless steel bonnet**

CF8M Stainless Steel
    NPT (1 or 2 NPT only)***
    CL150 RF***
    CL300 RF***
     CL600 RF*	
     SWE (NPS 1 or 2 / DN 25 or 50 only)**
     Sch 40 BWE
     Sch 80 BWE
    PN 16/25/40 (Not Available for NPS 8 x 6 or
        12 x 6 / DN 200 x 150 or 300 x 150)*	
	
     Specify ____________

Diaphragm, O-rings and Other Elastomers
(Select One)
    Nitrile (NBR)***
    Fluorocarbon (FKM)***
    Ethylenepropylene (EPDM)**

Cage and Cage Material (Select One)
    CF8M Stainless steel linear cage***
    416 Stainless steel Whisper Trim™ cage***
    316 Stainless steel Whisper Trim cage**
    ENC coated cast iron quick opening cage***

Type 6352 Pilot
    14 in. w.c. to 2 psig / 35 mbar to 0.14 bar***
    2 to 10 psig / 0.14 to 0.69 bar**

Main Valve Spring (Select One)
Maximum Differential and Spring Color
    20 psi / 1.4 bar, Yellow**
    60 psi / 4.1 bar, Green***
    125 psi / 8.6 bar, Blue***
    400 psi / 27.6 bar, Red***
Spring Material (Select One)
   Steel
    Inconel® X-750
Actuator Size (Select One)
    Type 1098 Size 70, maximum set pressure
     50 psig / 3.4 bar
    Type 1098 Size 40, maximum set pressure
     75 psig / 5.2 bar (standard)
    Type 1098 Size 30, maximum set pressure
     100 psig / 6.9 bar
    Type 1098H Size 30H, maximum set pressure
     350 psig / 24.1 bar

Body Flange Material (Select One)
    ENC Coated cast iron***
    ENC Coated steel***
    ENC Coated CF8M Stainless steel**
Plug and Seat Ring (Select One)
    416 Stainless steel***
    316 Stainless steel**

Outlet Pressure Range (Select One)
Type 6351 Pilot
    3 to 20 psig / 0.21 to 1.4 bar**
    5 to 35 psig / 0.34 to 2.4 bar**
    35 to 100 psig / 2.4 to 6.9 bar**

Type 6353 Pilot
    3 to 40 psig / 0.21 to 2.8 bar**
    35 to 125 psig / 2.4 to 8.6 bar**
Type 6354L Pilot
     85 to 200 psig / 5.9 to 13.8 bar**
Type 6354M Pilot
    175 to 220 psig / 12.1 to 15.2 bar**
Type 6354H Pilot
    200 to 300 psig / 13.8 to 20.7 bar**
Type 61L, 61LD or 61LE Pilot  
Specify Type _______________
    7 in. w.c. to 2 psig / 17 mbar to 0.14 bar**
    1 to 5 psig / 0.07 to 0.34 bar**
    2 to 10 psig / 0.14 to 0.69 bar**
    5 to 15 psig / 0.34 to 1.0 bar**
    10 to 20 psig / 0.69 to 1.4 bar**
Type 61H Pilot
    10 to 65 psig / 0.69 to 4.5 bar**
- continued -

Inconel® is a mark owned by Special Metals Corporation.

22

Bulletin 71.2:1098-EGR
Ordering Guide (continued)
Type 61HP Pilot
    15 to 45 psig / 1.0 to 3.1 bar**
    35 to 100 psig / 2.4 to 6.9 bar**
    100 to 300 psig / 6.9 to 20.7 bar**
Type Y600AM
    4 to 8 in. w.c. / 10 to 20 mbar
    7 to 16 in. w.c. / 17 to 40 mbar
    15 in. w.c. to 1.2 psig / 37 mbar to 0.08 bar
    1.2 to 2.5 psig / 0.08 to 0.17 bar
    2.5 to 4.5 psig / 0.17 to 0.31 bar
    4.5 to 7 psig / 0.31 to 0.48 bar  
Liquid Service
    Low gain restriction
6350 Series Pilot Construction (Select One)
    Aluminum***
    Stainless steel**

Main Valve Replacement Parts Kit (Optional)
    Yes, send one replacement parts kit to
match this order.
Actuator Replacement Parts Kit (Optional)
    Yes, send one replacement parts kit
to match this order.
Pilot Replacement Parts Kit (Optional)
    Yes, send one replacement parts kit
to match this order.
Wireless Position Monitor Mounting Kit (Optional)
    Yes, send one mounting kit for mounting the
Topworx™ 4310 or the Fisher® 4320 wireless
position monitor.
Option
    NACE Construction

Tubing and Fittings (Select One)
    Stainless steel tubing and steel plated fittings**
    Stainless steel tubing and fittings**

Specification Worksheet

  Application:
  Specific Use
  Line Size
  Gas Type and Specific Gravity
  Gas Temperature
  Does the Application Require Overpressure Protection?
   Yes    No  If yes, which is preferred:
    Relief Valve    Monitor Regulator    Shutoff Device
  Is overpressure protection equipment selection assistance
  desired? 

Regulators Quick Order Guide
***
**
*

Readily Available for Shipment
Allow Additional Time for Shipment
Special Order, Constructed from Non-Stocked Parts.  
Consult your local Sales Office for Availability.

  Pressure:
  Maximum Inlet Pressure (P1max)
  Minimum Inlet Pressure (P1min)
  Downstream Pressure Setting(s) (P2)
   Maximum Flow (Qmax)
  Performance Required:
  Accuracy Requirements?
  Need for Extremely Fast Response?
  Other Requirements:

Availability of the product being ordered is determined by the component with the
longest shipping time for the requested construction.

23

Bulletin 71.2:1098-EGR

Industrial Regulators

Natural Gas Technologies

TESCOM

Emerson Process Management
Regulator Technologies, Inc.

Emerson Process Management
Regulator Technologies, Inc.

Emerson Process Management
Tescom Corporation

USA - Headquarters
McKinney, Texas 75070 USA
Tel: +1 800 558 5853
Outside U.S. +1 972 548 3574

USA - Headquarters
McKinney, Texas 75070 USA
Tel: +1 800 558 5853
Outside U.S. +1 972 548 3574

USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tels: +1 763 241 3238
    +1 800 447 1250

Asia-Pacific
Shanghai 201206, China
Tel: +86 21 2892 9000

Asia-Pacific
Singapore 128461, Singapore
Tel: +65 6770 8337

Europe
Selmsdorf 23923, Germany
Tel: +49 38823 31 287

Europe
Bologna 40013, Italy
Tel: +39 051 419 0611

Europe
Bologna 40013, Italy
Tel: +39 051 419 0611
Chartres 28008, France
Tel: +33 2 37 33 47 00

Asia-Pacific
Shanghai 201206, China
Tel: +86 21 2892 9499

Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100

Middle East and Africa
Dubai, United Arab Emirates
Tel: +971 4811 8100

For further information visit www.emersonprocess.com/regulators
The Emerson logo is a trademark and service mark of Emerson Electric Co. All other marks are the property of their prospective owners. Fisher is a mark owned by Fisher Controls International LLC,
a business of Emerson Process Management.
The contents of this publication are presented for informational purposes only, and while every effort has been made to ensure their accuracy, they are not to be construed as warranties or
guarantees, express or implied, regarding the products or services described herein or their use or applicability. We reserve the right to modify or improve the designs or specifications of such
products at any time without notice.
Emerson Process Management Regulator Technologies, Inc. does not assume responsibility for the selection, use or maintenance of any product. Responsibility for proper selection, use and
maintenance of any Emerson Process Management Regulator Technologies, Inc. product remains solely with the purchaser.

©Emerson Process Management Regulator Technologies, Inc., 2001, 2015; All Rights Reserved



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