Emerson Type 92S Self Powered Control Valve Data Sheet

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Bulletin 71.2:92S
December 2011

Type 92S Pilot-Operated Steam Regulator
Introduction
The Type 92S steam regulator is piston actuated for
high cycle steam service which includes a Type 6492L,
6492H, or 6492HT pilot (see Figure 1). These pilots
have bellows sealed stems to eliminate stem guide
friction. The valve and pilot use lapped seating surfaces
that have been proven to minimize seat leakage.

Features
• Good Shutoff for Low Downstream Build-up—
Type 92S main valve and Types 6492H, 6492L, and
6492HT pilots are machine-lapped seating surfaces
that have been time-proven to minimize seat leakage
when the downstream demand is zero and the
regulator is shutoff.

W4086_3

1 NPT STEEL
MAIN VALVE WITH TYPE 6492H OR 6492HT PILOT

• Resistance to Piping Stresses—Steel
constructions are available to help resist the piping
stresses commonly encountered in steam applications.
• Ease of Installation—Compact construction
reduces installation space requirements. Supply of
pressure to the pilot is supplied from the inlet side
of the main valve through factory piped tubing;
with a standard pilot, this means no separate pilot
supply pressure is required.
• Increased Sensitivity to Downstream Pressure
Changes—Friction-reducing bellows seal on
the pilot stem and large pilot diaphragm areas
yield good sensitivity.
• Ease of Pilot Maintenance—Pilot valve plug and
seat can be removed for inspection of maintenance
without disassembling piping connections and
without removing the diaphragm. Pilot inlet screen
(Figure 2) is easily removed with the seating
parts for inspection and cleaning. Diaphragm can
be removed without disturbing the seating parts.

NPS 3 / DN 80 FLANGED CAST IRON
MAIN VALVE WITH TYPE 6492L PILOT

Figure 1. Type 92S Pilot-Operated Steam Regulator

full-flow means for the reduction of noise from high
velocity steam flow. Further noise reduction of
the system can be achieved by the use of a heavier
piping schedule and/or thermal insulation of the
attached piping.
D100621X012

• Noise Reduction Capability Without Decrease
in Capacity—A noise attenuation trim is
available for use with NPS 2 / DN 50 and larger
main valve sizes to provide an economical yet

W4088_1

www.fisherregulators.com

Bulletin 71.2:92S
Specifications
Main Valve Body Sizes and End Connection Styles
END CONNECTION STYLES AND RATINGS
BODY SIZES
1, 1-1/2, and 2
NPS 1, 1-1/2, 2, 2-1/2, 3,
and 4 / DN 25, 40, 50, 65,
80, and 100
NPS 6 x 4 /
DN 150 x 100(2)

Cast Iron Body

Steel or
Stainless Steel Body

NPT

NPT or PN 16/25/40

CL125 FF or
CL250 RF

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

Not available

CL300 RF,
CL600 RF, or
PN 16/25-40/64/100

Maximum Inlet and Pilot Supply Pressure(1)
	
Cast Iron Main Valve and Pilot: 250 psig /
	
17.2 bar or body rating limit, whichever is lower
	
Steel Main Valve and Pilot: 300 psig / 20.7 bar
	
or body rating limit, whichever is lower
Minimum and Maximum Differential Pressures(1)	
BODY SIZES,
NPS / DN

MINIMUM
DIFFERENTIAL
PRESSURE

MAXIMUM
DIFFERENTIAL
PRESSURE

1, 1-1/2, and 2 /
25, 40, and 50

15 psi / 1.0 bar

200 psi / 13.8 bar or
body rating limit,
whichever is lower

2-1/2, 3, 4, and 6 x 4 /
65, 80,100, and
150 x 100(2)

20 psi / 1.4 bar

175 psi / 12.1 bar or
body rating limit,
whichever is lower

Outlet (Control) Pressure Ranges
 	 See Table 1
Maximum Outlet Pressures(1)
	
See Table 2
Maximum Allowable Loading Pressure for Pilot
with Tapped Spring Case
	
Combination of pilot control spring setting and spring
	
case  loading pressure cannot exceed 150 psig /
	
10.3 bar for Type 6492H pilot or 25 psig / 1.7 bar 	 	
	 for Type 6492L pilot and 250 psig / 17.2 bar for 	 	
	Type 6492HT
Droop
 	 See Table 5 and Figure 8

Typical Regulating Capacities
 	 See Table 5 and Capacity Information section
Main Valve Orifice Sizes and Flow Coefficients
	
See Table 3
Noise Information
	
See Table 6 and Noise Abatement Information section
Construction Materials
	
Main Valve
 	 Body and Body Flange: Cast iron (NPS 1 through 4 / 		
	
DN 25 through 100 sizes only), steel or CF8M 	
	
    Stainless steel (all sizes)
	
Valve Plug: Heat-treated 17-4PH stainless steel
 	 Cage: Cast iron or Stainless steel
 	 Spiral Wound Gasket: 316L stainless steel
	
and graphite
 	 Spring, Lower Stem, Retaining Ring, Bolting, and  
	
Cylinder Spacer: Steel or plated steel
 	 Body and Cylinder Gaskets: Copper
 	 Pistons, Seat Ring, and Cylinders: Heat-treated
    416 Stainless steel
 	 Piston Ring(s): Polytetrafluoroethylene (PTFE)
 	 Piston Ring Retainer(s): 302 Stainless steel
 	 Noise Attenuation Trim (If Used):
 	 Stainless steel
	
Stem Seal: PTFE/glass
	
 	
	
 	
	
 	
 	
	
 	
 	
	
	
 	
 	
	

Pilot
Body and Spring Case: Cast iron, Steel, and 	
Stainless steel
Seat Ring and Stem: Heat-treated
416 Stainless steel
Bellows and Bellows Retainer: Brass
Plug, Plug Guide, Plug Spring, Diaphragms, Bleed  		
Restriction, and Inlet Screen: Stainless steel
Diaphragm Gasket: Encapsulated fiber asbestos
Control Spring, Upper Spring Seat, Adjusting  		
Screw, Bolting, Pipe Plug, Reducing Bushing,
and (If Used) Diaphragm Plate: Steel
Fittings: Brass
Tubing: Copper
Pipe Nipple: Steel

   1. The pressure/temperature limits in this Bulletin and any applicable standard or code limitations, must not be exceeded.
    2. The two-number designation indicates line size by trim size.

- continued -

2

Bulletin 71.2:92S
Specifications (continued)
Maximum Temperature Capabilities(1)
 	 Cast Iron Main Valve and Pilot: 406°F / 208°C
 	 Steel Main Valve and Pilot: 500°F / 260°C
  High Temperature Optional Steel and Stainless 	
  steel Main Valve and Pilot: 650°F / 343°C
Downstream Control Line Connection
	
NPS 1, 1-1/2, and 2 / DN 25, 40, and 50
    Main Valve Sizes: 1/4 NPT in main valve 	
	
cylinder spacer
	
NPS 2-1/2, 3, 4, and 6 x 4 / DN 65, 80, 100, and 	
	
150 x 100(2) Main Valve Sizes: 1/4 NPT 	
	
in pilot body
Pilot Spring Case Vent
	
Standard: 1/8-inch / 3.18 mm drilled hole
	
Optional: 1/4 NPT tapping for pressure loading or 	
	
on-off service

Pressure Registration
 	 External through downstream control line
Approximate Weights
BODY SIZE

END
CONNECTION STYLE

APPROXIMATE
WEIGHTS

NPS

DN

Pounds

kg

1
1-1/2

25
40

NPT or flanged
NPT or flanged

32
44

15
20

2

50

NPT
Flanged

55
67

25
30

2-1/2
3
4

65
80
100

Flanged
Flanged
Flanged

90
115
165

41
52
75

6 x 4(2)

150 x 100(2)

CL300

335

152

CL600

435

197

   1.  The pressure/temperature limits in this Bulletin and any applicable standard or code limitations, must not be exceeded.
     2. The two-number designation indicates line size by trim size.

Flanged

	

Table 1.  Outlet (Control) Pressure Ranges
PILOT TYPE

OUTLET PRESSURE
RANGES

PART NUMBER

COLOR CODE

SPRING WIRE DIAMETER

SPRING FREE LENGTH

psig

bar

Inches

mm

Inches

mm

6492L

2 to 6
5 to 15
13 to 25

0.14 to 0.41
0.35 to 1.0
0.90 to 1.7

1E395627022
1D7455T0012
1E395727192

Yellow
Green
Red

0.207
0.234
0.283

5.26
5.94
7.19

2.50
2.62
2.44

63.5
66.6
62.0

6492H

10 to 30
25 to 75
70 to 150

0.69 to 2.1
1.7 to 5.2
4.8 to 10.3

1E395627022
1D7455T0012
1E395727192

Yellow
Green
Red

0.207
0.234
0.283

5.26
5.94
7.19

2.50
2.62
2.44

63.5
66.6
62.0

6492HT

15 to 100
80 to 250

1.0 to 6.9
5.5 to 17.2

14B9943X012
14B9942X012

Unpainted

0.282
0.375

7.16
9.53

2.50
2.50

63.5
63.5

Table 2.  Maximum Inlet and Outlet Pressures
MAXIMUM ALLOWABLE INLET PRESSURE
CONSTRUCTION

psig
With Type 6492HT pilot

With Type 6492H pilot
With Type 6492L pilot

Steel and
Stainless Steel

Cast Iron
bar

psig

bar

---300
250

17.2

20.7

MAXIMUM
OPERATING OUTLET
PRESSURE

MAXIMUM EMERGENCY OUTLET PRESSURE
Cast Iron Main Valve
and Pilot Body

Steel or Stainless
Steel Main Valve and
Pilot Body

psig

bar

250

17.2

----

300 psig / 20.7 bar or
main valve body rating
limit, whichever is lower

150

10.3

250 psig / 17.2 bar or
main valve body rating
limit, whichever is lower

300 psig / 20.7 bar or
main valve body rating
limit, whichever is lower

25

1.7

100 psig / 6.9 bar

100 psig / 6.9 bar

3

Bulletin 71.2:92S
Table 3.  Flow and Sizing Coefficients(1)
BODY SIZE
NPS

DN

ORIFICE SIZE
Inches

mm

REGULATING
Cs

WIDE-OPEN Cs FOR
RELIEF SIZING

1

25

7/8

22

16

17.5

1-1/2

40

1-1/8

29

30

33

2

50

1-29/64

37

48

52

2-1/2

65

1-5/8

41

74

78

3

80

2-1/16

52

100

110

4

100

2-3/8

60

140

145

6x4

150 x 100

2-3/8

60

150

155

C1

Km

IEC SIZE COEFFICIENTS
XT

FD

FL

0.51
0.62

0.47

0.79

0.48
34

0.73
0.71

0.48
0.47
0.46

0.84

0.46

  1. Cv = Cs x 20 ÷ C1

  • Lapped Seats for Tight Shutoff—The valve and 	
pilot use lapped seating surfaces that have been 	
proven to minimize seat leakage.

the main valve spring to close the main valve plug,
reducing flow to the downstream system in response
to the decreased demand.

  •  Application Flexibility—Pilot with optional 	 	
tapped spring case is available for use either 	
	
with an air loading regulator for remote adjustment 	
of outlet pressure setting or, when all compression 	
is removed from the pilot control spring, with a 	
solenoid or switching valve for on-off service.

With a pilot for pressure-loaded service (Figure 7), the
operation is the same as for a standard pilot except
that the pilot control spring force on the pilot valve
plug is aided by pneumatic pressure from the loading
device. With a pilot for on-off service, the only force
acting on top of the pilot diaphragm is pneumatic
pressure provided by the solenoid or switching valve.

Principle of Operation
Pilot supply pressure is piped from the main valve inlet
(Figure 2) to the pilot inlet connection. Downstream
pressure registers on the main valve pistons through the
downstream control line and then on the pilot diaphragm.
When increased downstream demand lowers the
downstream pressure to a value below the setting
of the pilot control spring, this forces the pilot valve
plug to open increasing the loading pressure on the
main valve pistons. At the same time, the increased
demand lowers the downstream pressure on the
main valve piston(s). This opens the main valve plug,
increasing flow to the downstream system to satisfy
the increased demand and to restore downstream
pressure to the setting of the pilot control spring.
Decreased downstream demand increases the
downstream pressure registered on the pilot
diaphragm. The increased pressure overcomes the
force of the pilot control spring and allows the pilot
valve plug spring to close the valve plug. As the pilot
valve plug closes, excess loading pressure bleeds
to the downstream system through the pilot bleed
restriction. At the same time, decreased downstream
demand increases the downstream pressure
registered on the main valve piston(s). This allows

4

Installation
The Type 92S regulator should be installed and
used in accordance with governmental codes and
regulations. Although this regulator minimizes
leakage under shutoff conditions, downstream
overpressure protection must be provided by the
user. The pressure and temperature limitations in
the Specifications section must be observed and the
downstream equipment protected.
A Type 92S regulator may be installed in any
orientation, but should not be installed in a tall vertical
pipeline where condensate could collect and create
a pressure head affecting regulator performance.
To obtain maximum flow capacities in some instances,
outlet piping will have to be swaged up above the
given body size.
A downstream control line is required but is not
furnished with the Type 92S regulator. Additionally,
an adjustable loading pressure regulator and loading
pressure piping are required for pressure-loading pilot
regulators, while an on-off or solenoid valve is required
for on-off pilot regulators.
Dimensions are shown in Figure 9.

Type 92S

August 2007

Bulletin 71.2:92S

Type 92S Self-Powered Control Valve
PILOT
SPRING

PILOT VALVE
PLUG

MAIN VALVE
PISTONS

MAIN VALVE
SPRING

PILOT INLET
SCREEN

MAIN VALVE
PLUG

A6552

September 2006

Type 92S

NPS 1, 1-1/2, OR 2 / DN 25, 40, OR 50
MAIN VALVE BODY AND TYPE 6492H OR 6492HT PILOT

Type 92S 2-1/2 thru 6 x 4-Inch (DN 65 thru 150 x 100)
MAIN VALVE
PLUG

MAIN VALVE
PISTON
MAIN VALVE
STEM
PILOT VALVE
PLUG SPRING

INLET PRESSURE

INLET PRESSURE

PILOT INLET
SCREEN

OUTLET OUTLET
PRESSURE
PRESSURE

ATMOSPHERIC
PRESSURE
ATMOSPHERIC
PRESSURE
LOADING PRESSURE

LOADING PRESSURE

A6553

A6553

NPS 2-1/2, 3, 4, OR 6 x 4 / DN 65, 80, 100, OR 150 x 100
MAIN VALVE BODY AND TYPE 6492L PILOT

Figure 2. Type 92S Pressure Reducing Regulator Operational Schematics

5

Bulletin 71.2:92S

T

TYPE 6492H PILOT

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

TYPE 92S MAIN VALVE
TYPE 6492HM SAFETY
OVERRIDE PILOT

E0402

Figure 3.  NPS 1, 1-1/2, and 2 / DN 25, 40, and 50 Type 92S Pilot-Operated Pressure Reducing Regulator with Safety Override
Pilot Operational Schematic

TYPE 92S MAIN VALVE

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

TYPE 6492HM SAFETY
OVERRIDE PILOT

TYPE 6492H PILOT

E0403

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE
LOADING PRESSURE
INTERMEDIATE PRESSURE

Figure 4.  NPS 2-1/2, 3, and 4 / DN 65, 80, and 100 Type 92S Pilot-Operated Pressure Reducing Valve with Safety Override
Pilot Operational Schematic

6

Bulletin 71.2:92S
Table 4.  Safety Pilot Outlet (Control) Pressure Ranges

TYPE

6492HM

6492HTM

SPRING RANGE

PART NUMBER

MINIMUM PRESSURE AT WHICH
MONITORING PILOT CAN BE SET

Yellow

1E395627022

5 psig / 0.35 bar over normal distribution pressure

Green

1D7455T0012

SPRING COLOR

psig

bar

10 to 30

0.69 to 2.1

25 to 75

1.7 to 5.2

Black

70 to 150

4.8 to 10.3

15 to 100

1.0 to 6.9

80 to 250

5.5 to 17.2

TYPE 92S MAIN VALVE

Unpainted

1E395727192
14B9943X012

10 psig / 0.69 bar over normal distribution pressure

14B9942X012

TYPE 92S MAIN VALVE
TYPE 6492H PILOT

TYPE 6492H PILOT

TOP VIEW

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

TYPE 6492H PILOT
TYPE 92S MAIN VALVE

TYPE 6492HM SAFETY
OVERRIDE PILOT

SIDE VIEW

Figure 5.  NPS 1, 1-1/2, and 2 / DN 25, 40, and 50 Piping Schematics

7

Bulletin 71.2:92S
Type 92S Pilot-Operated Pressure
Reducing Regulator with Safety
Override Pilot
A Type 6492HM or 6492HTM safety override pilot is
available for the Type 92S. The Type 6492H pilot is
used in a series installation with the Type 6492HM
or 6492HTM safety override pilot installed on the
upstream regulator. The Type 6492HM or 6492HTM
safety override pilot senses pressure downstream
of the second valve, and prevents pressure from
rising above safe operating pressure in the event the
downstream valve fails. This system is approved by
ASME B31.1-1989, 122.14.2.A, and can replace an
ASME safety valve when vent piping is not practical
and Type 92S Pilot-Operated, Pressure Reducing
Regulator with Safety Override Pilot upstream steam
pressure does not exceed 400 psig / 27.6 bar. Local
codes and standards may require approval by an
appropriate authority prior to installation.

Operation
Once placed in operation, the upstream Type 6492H
pilot senses the intermediate pressure between both
valves, and the Type 6492HM or 6492HTM pilot
senses downstream pressure of the second valve. As
demand for flow increases, intermediate pressure will
fall causing the Type 6492H pilot to open. As the
Type 6492H pilot valve opens, loading pressure to the
main valve increases, opening the main valve.
The Type 6492HM or 6492HTM safety override
pilot remains open because its setpoint is above the
setpoint of the downstream valve. In the unlikely event
that the downstream valve fails open, downstream
pressure will rise above the downstream valve’s
setpoint. This pressure is sensed by the
Type 6492HM or 6492HTM safety override pilot. As
downstream pressure increases the safety override
pilot closes, reducing loading pressure to the main
valve, which positions the main valve to maintain
downstream pressure as specified per ASME Boiler
and Pressure Vessel Code, Section VIII.
In the event that the upstream valve fails, the
downstream regulator will prevent downstream
pressure from rising above safe operating levels.
It is recommended to install some type of warning
system, such as a sentinal relief valve, to warn the
operator that a valve has failed in the system. This
will prevent prolonged operation with one valve, which
could cause valve trim wear and noise associated with
operation at high differential pressures.

8

When operating in most steam systems, valve setpoints
should be in strict accordance to ASME Boiler and
Pressure Vessel Code, Section VIII. The Type 6492HM
or 6492HTM safety override pilot should be set at
10 psig / 0.69 bar or 10% above maximum downstream
operating pressure of the second valve, whichever
pressure is greater. For example, most HVAC systems
operate at 15 psig / 1.0 bar, so the safety override pilot
should be set no higher than 25 psig / 1.7 bar.

Capacity Information
Table 5 gives typical regulating capacities in pounds
per hour / kg/h of saturated steam. Capacities for
regulators with noise attenuation trim are the same as
for regulators without noise attenuation trim. Figure 8
shows a typical performance curve.
To determine regulating capacities at pressure settings
not given in Table 5 or to determine wide-open
capacities for relief sizing at any inlet pressure, use the
following procedure 1 or 2 as appropriate.
  1.  If the steam is saturated and the pressure drop 	
across the regulator is critical (absolute outlet 	
pressure is equal to approximately one-half or less	
than one-half of the absolute inlet pressure), use 	
the equation:
Q = (P1abs) (Cs)
where,
Q     =  Flow capacity in pounds of saturated steam  
      	 per hour
P1abs   =  Absolute inlet pressure in psia (P1gauge + 14.7)
Cs    =  Regulating or wide-open steam sizing coefficient        
        (see Table 3)
  2.  If the steam is superheated or if the pressure drop 	
across the regulator is lower than critical (absolute 	
outlet pressure is greater than approximately one-	
half the absolute inlet pressure), use the valve 	
sizing slide rule or the sizing nomographs
	
in Catalog 10.

Noise Abatement Information
A noise attenuation trim is available for use with
NPS 2 / DN 50 and larger Type 92S steam regulators
to provide an economical means for the reduction of
noise from high-velocity steam flow. Capacities for a
regulator equipped with a noise attenuation trim are
the same as for a regulator without noise attenuation
trim and are given in Table 5.

Bulletin 71.2:92S

TYPE 6492H PILOT

TYPE 92S MAIN VALVE

BOTTOM VIEW

TYPE 6492HM SAFETY
OVERRIDE PILOT

TYPE 92S MAIN VALVE

TYPE 6492H PILOT

SIDE VIEW

Figure 6.  NPS 2-1/2, 3, and 4 / DN 65, 80, and 100 Piping Schematics

Noise level values for a regulator equipped either
with or without a noise attenuation trim are presented
in Table 6. These noise levels are determined at
a point 39-inches / 991 mm downstream of the
regulator outlet and 39-inches / 991 mm from the
piping surface.
For example, consider full-capacity flow of steam
through a NPS 2 / DN 50 Type 92S steam regulator
connected with uninsulated 2-inch / 51 mm Schedule
40 downstream piping (see Table 6). For an inlet
pressure of 250 psig / 17.2 bar and an outlet pressure
of 100 psig / 6.9 bar, P/P1abs is 0.6. Under the
specified service conditions, the noise level for steam

flow through a Type 92S steam regulator without a
noise attenuation trim will be 98 decibels, while the
same regulator equipped with a noise attenuation trim
will have a noise level reduced to 92 decibels.
Noise levels for steam flow through a Type 92S steam
regulator can be reduced further with the use of either
a heavier schedule of pipe or thermal insulation of
the downstream piping. By using thermal insulation,
as much as 15 decibels of noise can be additionally
reduced from the system. Consult the insulation
manufacturer’s specifications for the attenuating
capability and application procedures of the specific
insulation required by your system.

9

Bulletin 71.2:92S
AIR LOADING
REGULATOR

BLEED RESTRICTION (REQUIRED
ONLY IF THE LOADING REGULATOR
DOES NOT HAVE INTERNAL RELIEF)

NEEDLE
VALVE

CONTROL LINE
CONNECTION

CONTROL LINE
SHUTOFF VALVE

STRAINER

BLOCK
VALVE

BLOCK VALVES

VENT VALVE
BYPASS LINE

16A7958-B
16A1547-A
A3334

Figure 7.  Typical Pressure-Loaded Pilot Installation

FLOW kg/h OF SATURATED STEAM
1000

2000

3000

4000

5000

6000

7000

80
5

4

3

40

2

OUTLET PRESSURE, bar

OUTLET PRESSURE, psig

60

20
1

0
0

4000

8000

12,000

16,000

0

FLOW, POUNDS/HOUR OF SATURATED STEAM
A3330/IL

	
NOTE:
	  INITIAL OUTLET PRESSURE SETTING IS 60 psig / 4.1 bar

Figure 8.  Typical Performance Curve for NPS 2-1/2 / DN 65 Type 92S Pressure Reducing Regulator with Type 6492H Pilot

10

Bulletin 71.2:92S
Table 5.  Flow Capacities in Pounds per Hour / kg/h of Saturated Steam
OUTLET
PRESSURE
SETTING(1)
psig

5

10

15

20

30

40

50

60

80

100

INLET
PILOT
TYPE PRESSURE
NUMBER
bar
psig bar

MAIN VALVE BODY SIZE, NPS / DN
1 / 25

1-1/2 / 40

2 / 50

3 / 80

4 / 100

6 x 4 / 150 x 100 DROOP

lbs/h

kg/h

lbs/h

kg/h

lbs/h

lbs/h

kg/h

lbs/h

kg/h

lbs/h

kg/h

lbs/h

kg/h

25
30
50

1.7
2.1
3.5

575
700
950

261
318
431

950
1,150
1,800

431
522
816

1,750 794 1,000
1,880 853 1,500
2,950 1,338 4,180

454
680
1,896

1,225
2,200
6,550

556
998
2,971

2510
4000
8500

1,139
1,814
3,856

2,600
4,100
8,600

1,179
1,860
3,901

75
100
150

5.2
6.9
10.3

1,350
1,725
1,800

612
782
816

2,375 1,077 4,100 1,860 6,000 2,722 8,400 3,810
3,050 1,383 5,600 2,540 8,500 3,856 10,300 4,672
4,050 1,837 6,150 2,790 11,900 5,398 16,900 7,666

12,600
14,300
23,000

5,715 12,900 5,851
6,486 15,100 6,849
10,433 23,600 10,705

30
50
75

6492H or
6492L
100
150
200

2.1
3.5
5.2

700
1,040
1,440

318
472
653

1,200 544 2,050 930 3,050
1,800 816 3,100 1,406 4,700
2,600 1,179 4,400 1,996 6,000

1,950
2,835
4,082

5800
8920
11,000

2,631
4,046
4,990

5,800
9,200
11,500

2,631
4,173
5,216

6.9
10.3
13.8

1,800
2,350
2,150

816 3,300 1,497 5,600 2,540 8,600 3,901 10,700 4,854
1066 4,500 2,041 8,000 3,629 12,000 5,443 17,000 7,711
975 5,100 2,313 9,200 4,173

16,300
19,600

7,394
8,891

17,100
20,200

7,757
9,163

35
50
75

6492L,
6492H, or
6492HT 100
150
200

2.4
3.5
5.2

710
1,040
1,440

322
472
653

4600
7700
11,900

2,087
3,493
5,398

4,600
8,100
12,200

2,087
3,674
5,534

6.9
10.3
13.8

1,820
2,600
3,400

826 3,400 1,542 5,450 2,472 8,100 3,674 11,800 5,352
1179 4,800 2,177 7,800 3,538 12,100 5,489 16,900 7,666
1542 6,200 2,812 10,200 4,627

16,100 7,303 16,800 7,620
23,100 10,478 23,800 10,796

50
6492L,
75
6492H, or 100
6492HT 150
200

3.5
5.2
6.9
10.3
13.8

1,040
1,440
1,820
2,650
3,450

472
653
826
1202
1565

1,800
2,700
3,450
4,900
6,400

816
1,225
1,565
2,223
2,903

2,950
4,300
5,450
7,950
10,300

1,338
1,950
2,472
3,606
4,672

4,590
6,450
8,650
12,300

2,082 6,250 2,835
2,926 9,100 4,128
3,924 11,900 5,398
5,579 17,150 7,779

7,570
3,434
7,700 3,493
11,000 4,990 11,800 5,352
16,200 7,348 16,900 7,666
23,500 10,660 24,100 10,932

6492H,
6492HT

50
75
100
150
200

3.5
5.2
6.9
10.3
13.8

900
1,440
1,820
2,650
3,450

408
653
826
1202
1565

1,650
2,700
3,450
4,900
6,500

748
1,225
1,565
2,223
2,948

2,700
4,300
5,450
7,950
10,000

1,225
1,950
2,472
3,606
4,536

4,040
6,580
8,400
12,000
15,700

1,833 5,350 2,427
2,985 8,800 3,992
3,810 11,800 5,352
5,443 17,000 7,711
7,122 22,100 10,025

2.8

6492H,
6492HT

60
75
100
150
200

4.1
5.2
6.9
10.3
13.8

1,100
1,440
1,820
2,650
3,450

499
653
826
1202
1565

1,750
2,500
3,450
4,900
6,500

794
1,134
1,565
2,223
2,948

3,300
4,300
5,450
7,950
10,300

1,497
1,950
2,472
3,606
4,672

4,500
6,300
8,500
12,600
16,700

2,041 6,400
2,858 8,350
3,856 11,400
5,715 17,000
7,575 22,650

3.5

6492H,
6492HT

75
100
150
200
250

5.2
6.9
10.3
13.8
17.2

1,250
1,820
2,650
3,450
4,300

567
826
1202
1565
1950

2,250
3,200
4,900
6,500
8,000

1,021
1,452
2,223
2,948
3,629

3,750
5,450
7,950
10,300
12,900

1,701
2,472
3,606
4,672
5,851

4,950
8,400
12,200
15,695

2,245 7,950 3,606
3,810 11,800 5,352
5,534 17,000 7,711
7,119 22,100 10,025

10,800 4,899 11,500 5,216
16,100 7,303 17,000 7,711
23,100 10,478 24,000 10,886
30,100 13,653 31,000 14,062

4.1

6492H,
6492HT

80
100
150
200
250

5.5
6.9
10.3
13.8
17.2

1,365
1,780
2,650
3,450
4,300

619
807
1202
1565
1950

2,300
3,100
4,900
6,500
8,000

1,043
1,406
2,223
2,948
3,629

4,080
5,300
7,950
10,300
12,900

1,851
2,404
3,606
4,672
5,851

5,500
7,880
12,300
16,400

2,495 7,700 3,493
3,574 10,600 4,808
5,579 16,750 7,598
7,439 22,450 10,183

10,500 4763 11,000 4,990
14,200 6,441 15,000 6,804
22,700 10,297 23,000 10,433
30,200 13,699 31,000 14,062

5.5

6492H,
6492HT

100
150
200
250

6.9
10.3
13.8
17.2

1,450
2,600
3,450
4,300

658
1179
1565
1950

2,600
4,650
6,500
8,000

1,179
2,109
2,948
3,629

4,350
7,800
10,300
12,900

1,973
3,538
4,672
5,851

6,270
11,700
15,600
19,300

2,844 9,250 4,196
5,307 15,850 7,190
7,076 21,750 9,866
8,754 27,750 12,587

11,900 5,398 12,300 5,579
21,400 9,707 22,000 9,979
29,600 13,427 30,200 13,699
38,000 17,237 39,000 17,690

6.9

6492H,
6492HT

125
150
200
250
300

8.6
10.3
13.8
17.2
20.7

1,900
2,490
3,450
4,300
5,050

862
1129
1565
1950
2291

3,300
4,350
6,250
8,000
9,400

1,497
1,973
2,835
3,629
4,264

5,700
7,450
10,300
12,900
15,100

2,586
3,379
4,672
5,851
6,849

8,470
11,000
15,700
20,100

3,842
4,990
7,122
9,117

14,400 6,532 15,200 6,895
19,900 9,027 20,500 9,299
28,700 13,018 29,100 13,200
35,700 16,194 36,500 16,556

0.35

0.69

1.0

1.4

2.1

6492L

kg/h

2-1/2 / 65

1,300 590 2,100 953 2,300
1,800 816 2,950 1,338 4,550
2,650 1,202 4,300 1,950 6,300

1,383
2,132
2,722

1,043
2,064
2,858

4,300
6,250
9,000

3,200
6,200
8,900

11,400
14,900
21,350
26,800

1,452
2,812
4,037

1 psi /
0.07 bar

7770
3,524
8,100 3,674
12,000 5,443 12,500 5,670
19,000 8,618 19,600 8,891 10% of
23,100 10,478 23,800 10,796 outlet
30,100 13,653 30,600 13,880 pressure
setting
2,903
8800
3,992
9,000 4,082
3,788 11,300 5,126 11,900 5,398
5,171 15,300 6,940 16,100 7,303
7,711 23,000 10,433 24,000 10,886
10,274 30,600 13,880 31,400 14,243

5,171
6,759
9,684
12,156

1. Standard pilot or combination of setting plus loading pressure or optional pilot.
- shaded areas show where maximum differential pressure is exceeded.

- continued -

11

Bulletin 71.2:92S
Table 5.  Flow Capacities in Pounds per Hour / kg/h of Saturated Steam (continued)
OUTLET
PRESSURE
SETTING(1)
psig

bar

INLET
PILOT
PRESSURE
TYPE
NUMBER
psig bar

125

8.6

6492H,
6492HT

140
150
200
250
300

150

10.3

6492H,
6492HT

175
200
250
300

MAIN VALVE BODY SIZE, NPS / DN
1 / 25
lbs/h

1-1/2 / 40

kg/h

3 / 80

4 / 100

lbs/h

kg/h

lbs/h

kg/h

lbs/h

kg/h

4,800
5,700
9,450
12,900
15,100

2,177
2,586
4,287
5,851
6,849

9,200
14,600
19,500
23,800

4173
6623
8845
10,796

13,100
19,950
27,000
32,500

5,942
9,049
12,247
14,742

12.1
13.8
17.2
20.7

2,450
3,050
4,150
5,050

7,300
9,100
12,400
15,100

3,311
4,128
5,625
6,849

10,000
13,400
18,600
23,400

4536
6078
8437
10,614

14,000
18,200
25,750
31,900

6,350
8,256 30,800 13,971 31,000 14,062
11,680 34,100 15,468 35,200 15,967
14,470 42,900 19,459 43,300 19,641

1,814
2,381
3,357
4,264

lbs/h

kg/h

6 x 4 / 150 x 100 DROOP

1,600 726 3,100 1,406
1,900 862 3650 1,656
3,150 1,429 5,750 2,608
4,300 1,950 8,000 3,629
5,050 2,291 9,400 4,264
4,000
5,250
7,400
9,400

kg/h

2-1/2 / 65

9.7
10.3
13.8
17.2
20.7

1,111
1,383
1,882
2,291

lbs/h

2 / 50

lbs/h

kg/h

16,400 7,439 16,900 7,666
27,000 12,247 28,000 12,701 10% of
37,500 17,010 38,300 17,373 outlet
44,300 20,094 45,100 20,457 pressure
19,100 8,664 20,100 9,117 setting

  1. Standard pilot or combination of setting plus loading pressure or optional pilot.

- shaded areas indicate where minimum differential pressure is not attained.

Table 6.  Noise Level Data in Decibels with Schedule 40 Downstream Piping and No Insulation(1)
NOISE LEVEL, dBA
P1

psig

50

100

∆P
P1abs

PERCENTAGE
OF MAXIMUM
REGULATOR
FLOW RATE

bar

NPS 2 / DN 50 Main
Valve Body with
2-inch / 51 mm
Downstream Piping

NPS 2-1/2 / DN 65 Main
Valve Body with
4-inch / 102 mm
Downstream Piping

NPS 3 / DN 80 Main
Valve Body with
4-inch / 102 mm
Downstream Piping

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

0.2

100
30

73
62

72
61

66
59

64
56

72
63

68
60

78
71

76
68

0.3

100
30

79
68

77
66

72
61

68
57

78
65

72
61

83
73

78
70

0.4

100
30

82
71

79
68

76
65

69
61

80
69

74
65

86
76

81
73

0.5

100
30

84
73

80
69

78
67

72
63

82
73

76
67

88
79

83
75

0.6

100
30

87
76

80
70

81
70

75
65

82
74

79
68

90
80

84
76

0.7

100
30

88
78

82
71

84
73

79
69

88
80

83
71

92
83

87
79

0.2

100
30

78
67

77
66

71
64

69
61

77
68

73
65

83
76

81
73

0.3

100
30

84
73

82
71

77
66

73
62

83
70

77
66

88
78

83
75

0.4

100
30

86
76

84
72

81
70

74
66

85
74

79
70

91
80

86
78

0.5

100
30

89
78

85
74

83
72

77
68

87
78

81
72

93
84

88
80

0.6

100
30

92
81

86
75

86
75

80
70

87
79

84
73

95
85

89
81

0.7

100
30

82
93

75
86

78
89

74
84

85
93

76
88

88
97

84
92

3.5

6.9

1. Overall noise levels determined at a point 39-inches / 991 mm downstream of the regulator outlet and 39-inches / 991 mm from piping surface.

- continued -

12

NPS 4 / DN 100 Main
Valve Body with
8-inch / 203 mm
Downstream Piping

Bulletin 71.2:92S
Table 6.  Noise Level Data in Decibels with Schedule 40 Downstream Piping and No Insulation(1)(continued)
NOISE LEVEL, dBA
P1

psig

250

∆P
P1abs

PERCENTAGE
OF MAXIMUM
REGULATOR
FLOW RATE

bar

NPS 2 / DN 50 Main
Valve Body with
2-inch / 51 mm
Downstream Piping

NPS 2-1/2 / DN 65 Main
Valve Body with
4-inch / 102 mm
Downstream Piping

NPS 3 / DN 80 Main
Valve Body with
4-inch / 102 mm
Downstream Piping

NPS 4 / DN 100 Main
Valve Body with
8-inch / 203 mm
Downstream Piping

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

Without
Attenuator

With
Attenuator

0.2

100
30

84
73

81
71

78
71

76
68

84
75

80
72

90
83

88
80

0.3

100
30

90
80

85
77

84
73

80
69

90
77

84
73

95
85

90
82

0.4

100
30

93
82

88
78

88
77

81
73

92
81

86
77

98
88

93
85

0.5

100
30

95
85

91
80

90
79

84
75

94
85

88
79

100
91

95
87

0.6

100
30

98
88

92
82

93
82

87
77

94
86

91
80

102
92

96
88

0.7

100
30

101
89

94
83

96
85

91
81

100
92

95
83

104
95

99
91

17.2

1. Overall noise levels determined at a point 39-inches / 991 mm downstream of the regulator outlet and 39-inches / 991 mm from piping surface.

Ordering Information

Construction

When ordering, specify:

Refer to the Specifications section on page 2. Review
the descriptions to the right of each specification,
and specify the desired choice wherever there is a
selection to be made. If not otherwise specified,
the pilot control spring is factory-set at the
approximate mid-range.

Application
  •  Range of temperatures
  •  Range of inlet pressures (maximum, normal, minimum)
  •  Outlet pressure setting
  •  Range of flow rates (maximum, normal,
  minimum, controlled)
  •  Body size

Be sure to specify the type of regulator desired
(standard pilot or pilot with optional tapped spring case).
Refer to separate bulletins for information on loading
regulators for use with pressure loaded pilots.

13

Bulletin 71.2:92S
B

TRIM
REMOVAL
CLEARANCE

R

S

1/4 NPT
CONTROL LINE
CONNECTION ON
BACKSIDE
E

17A8559-A
B1904

A/2
A

NPS 1, 1-1/2, OR 2 / DN 25, 40, OR 50 MAIN VALVE BODY
R

S

1/4 NPT
CONTROL LINE
CONNECTION

E

A/2

17A8560-A
B1904

B
A

TRIM
REMOVAL
CLEARANCE

NPS 2-1/2, 3, 4, OR 6 x 4 / DN 65, 80, 100, OR 150 x 100 MAIN VALVE BODY

Figure 9. Dimensions
Table 7. Dimensions
DIMENSIONS, INCHES / mm
A

MAIN VALVE
BODY SIZE

CL125 FF or
CL150 RF
Flanged

NPT

R
CL250 RF or
CL300 RF
Flanged

E
(Maximum)

B

CL600 RF
Flanged

Types 6492H
and 6492HT
Pilot

Trim
Removal
Clearance

S

Type 6492L
PIlot

NPS

DN

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

Inches

mm

1
1/2
2

25
40
50

8.25
9.88
11.25

210
251
286

7.25
8.75
10.00

184
222
254

7.75
9.25
10.50

197
235
267

8.25
9.88
11.25

210
251
286

3.88
5.38
5.88

99
137
149

11.69
12.19
13.00

297
310
330

8.50
8.81
9.06

216
224
230

9.88
10.19
10.44

251
259
265

1.94
2.69
2.94

49
68
75

2.75

70

2-1/2
3
4
6x4

65
80
100
150 x 100

10.88
11.75
13.88
----

276
298
353
----

11.50
12.50
14.50
18.62

292
318
368
473

12.25
13.25
15.50
20.00

311
337
394
508

6.56
7.38
8.62
8.62

167
187
219
219

17.19
18.25
20.44
22.06

437
464
519
560

8.75
8.75
10.38
11.50

222
222
264
292

10.12
10.12
11.75
12.88

257
257
298
327

3.28
3.69
4.31
4.31

83
94
109
109

3.12
3.12
5.00
7.00

79
79
127
178

14

-------------

Bulletin 71.2:92S
Ordering Guide
Body Size (Select One)

Outlet Pressure Range (Select One)

 
 
 
 
 
 
 

Type 6492L Pilot

  NPS 1 / DN 25**
  NPS 1-1/2 / DN 40**	
  NPS 2 / DN 50***
  NPS 2-1/2 / DN 65*
  NPS 3 / DN 80**
  NPS 4 / DN 100**
  NPS 6 x 4 / DN 150 x 100
    (WCC, Steel, or Stainless steel with CL300 RF and
CL600 RF only)*

Body and Body Flange Material and
End Connection Style (Select One)
Cast Iron
   NPT***
    CL125 FF**
    CL250 RF**

Type 6492H Pilot
	

    10 to 30 psig / 0.69 to 2,1 bar, Yellow***
    25 to 75 psig / 1.7 to 5.2 bar, Green***
    70 to 150 psig / 4.8 to 10.3 bar, Red***
Type 6492HT Pilot
    15 to 100 psig / 1.0 to 6.9 bar, Unpainted***
    80 to 250 psig / 5.5 to 17.2 bar, Unpainted***
Noise Attenuation Trim (Optional)
   Yes**
Replacement Pilot (Optional)

WCC Steel
 
 
 
 

    2 to 6 psig / 0.14 to 0.41 bar, Yellow***
    5 to 15 psig / 0.35 to 1.0 bar, Green***
    13 to 25 psig / 0.90 to 1.7 bar, Red***

 NPT***
  CL150 RF**
  CL300 RF**
  CL600 RF**
  PN 16/25/40**

CF8M Stainless Steel
   NPT**
  CL150 RF*
    CL300 RF*
    CL600 RF*
  PN 16/25/40*

    Yes, send one replacement pilot to match this order.
Main Valve Replacement Parts Kit (Optional)
    Yes, send one main valve replacement parts kit to match
  this order.

	

Pilot Replacement Parts Kit (Optional)
    Yes, send one pilot replacement parts kit to match
   this order.

	

Tubing and Fittings (Select One)
    Copper tubing with brass fittings***
    Stainless steel tubing and fittings**
Pilot Bellows (Select One)
   Brass (standard)***
    321 Stainless steel**

Steam Specification Worksheet
Application:
Tag Number:
Valve Type:
 Direct-Operated	
 Pilot-Operated
	
  Pressure Loaded	  Differential
Body Material:   Steel	
 Iron	   Stainless Steel
Inlet/Outlet End Connection Style:	 
	
  
  CL150 RF Flange   NPT
  CL300 RF Flange
  CL250 RF Flange 	
  PN 16/25/40
 
  CL600 RF Flange
Inlet/Outlet Pipe Size:		
  Inches / mm
Steam Conditions:
  Inlet Pressure (psig/bar)

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.

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

Maximum

Normal

Minimum

    Inlet Temperature (°F/°C)
    Outlet Pressure (psig/bar)
    Flow (pounds/h or kg/hr)

Performance Required:
Accuracy Requirements: 

  ≤10%    ≤20% 
  ≤30%    ≤40%

	

15

Bulletin 71.2:92S

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 75069-1872, USA
Tel: +1 800 558 5853
Outside U.S. +1 972 548 3574

USA - Headquarters
McKinney, Texas 75069-1872, 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
Gallardon 28320, 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
For further information visit www.fisherregulators.com

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 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 product remains solely with the purchaser.

©Emerson Process Management Regulator Technologies, Inc., 1984, 2011; All Rights Reserved



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