Emerson Type Mr108 Direct Operated Backpressure Regulators Data Sheet

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Bulletin 71.4:MR108
October 2014

Type MR108 Direct-Operated
Backpressure Regulators

P1202

P1203

TYPE MR108 WITH
LOW-PRESSURE ACTUATOR

TYPE MR108 WITH
HIGH-PRESSURE ACTUATOR

Contents

Features

Introduction ................................................................ 3
Specifications ............................................................. 2
Features ..................................................................... 3
Principle of Operation ................................................. 3
Overpressure Condition ............................................ 6
Installation .................................................................. 6
Applications................................................................. 6
Universal NACE Compliance .................................... 7
Ordering Information .................................................. 15
Ordering Guide ........................................................ 15

  •	
  •	
  •	
  •	

Large Flow
Stability
Fast Response
Steel and Stainless Steel Constructions Meet
API 614 Requirements
  •  Available Constructions to Meet NACE MR01752003 and MR0103 Requirements for Sour Gas
Service Capability
  •	 Multiple Trim Materials Available
  •	 ANSI/FCI 70-3-2004 Class VI Shutoff
  •	 Multiple End Connection Options
  •	 P1 = P2 on High-Pressure Actuator
  •	 Suitable for High-Temperature Applications up
to 250°F / 121°C
  •	 Drain Valve
  •	 Pressure-Loaded Actuator
  •	 Bleed valve (for High-Pressure Actuator only)

www.fisherregulators.com

D103257X012

Figure 1. Type MR108 Direct-Operated Backpressure Regulators

Bulletin 71.4:MR108
Specifications
The Specifications section on this page provides the ratings and other specifications for the Type MR108. The
following information is stamped on the nameplate fastened on the regulator at the factory: type; body size;
maximum inlet, outlet and differential pressure; maximum pressure above setpoint; maximum casing pressure;
maximum temperature; spring range; cage type; and trim and diaphragm material.
Body Sizes and End Connection Styles
	
See Table 1
Shutoff Classification per ANSI/FCI 70-3-2004 		
	
Class VI (Soft Seat)
Maximum Inlet, Outlet and Emergency
Casing Pressure(1)
See Table 5

Pressure Registration
	
External

Backpressure Control Ranges
	
5 to 300 psig / 0.34 to 20.7 bar; See Table 2
Construction Materials
	
See Table 3
Maximum Setpoint
	
Low-Pressure Actuator: 35 psig / 2.4 bar
	
High-Pressure Actuator:
	 Nitrile (NBR) and Ethylene Propylene (EPDM)
Diaphragm: 300 psig / 20.7 bar
	 
Fluorocarbon (FKM) Diaphragm: 150 psig / 10.3 bar
Maximum Differential Pressures
Low-Pressure Actuator: 70 psig / 4.8 bar
High-Pressure Actuator: 400 psig / 27.6 bar or
maximum inlet pressure, whichever is lower
Maximum Pressure Over Setpoint to Avoid Internal
Parts Damage(1)
	
Low-Pressure Actuator: 20 psig / 1.4 bar
	
High-Pressure Actuator: 120 psig / 8.3 bar
Flow and Sizing Coefficients
	
See Table 4
Cv Coefficients
	
See Tables 6 and 7
Capacities
	
See Tables 8 through 11

Temperature Capabilities(1)
	
Nitrile (NBR): -20 to 180°F / -29 to 82°C
	
Fluorocarbon (FKM): 20 to 250°F / -7 to 121°C(2)
	
Ethylene Propylene (EPDM): -20 to 225°F /
-29 to 107°C(3)

Upstream Control Line Connection Size  
	
1/2 NPT
Spring Case Vent
	
Type Y602-12
Pressure-Loaded Spring Case Vent Connection
	
1/2 NPT
Approximate Weights
	
For Type MR108 with Low-Pressure Actuator
	 
NPS 1 / DN 25: 88 lbs / 40 kg
	 
NPS 2 / DN 50: 118 lbs / 54 kg
	 
NPS 3 / DN 80: 167 lbs / 76 kg
	 
NPS 4 / DN 100: 176 lbs / 80 kg
	
For Type MR108 with High-Pressure Actuator
	 
NPS 1 / DN 25: 78 lbs / 35 kg
	 
NPS 2 / DN 50: 107 lbs / 49 kg
	 
NPS 3 / DN 80: 156 lbs / 71 kg
	 
NPS 4 / DN 100: 166 lbs / 75 kg
Options
	
•  Inlet Pressure Gauge Tap on Body
	
•  Pressure-Loaded Actuator
	
•  Drain Valve
	
•  NACE Construction
	
•  Bleed Valve (For High-Pressure Actuator only)
	
•  Ethylene Propylene (EPDM) Elastomer Trim Parts

1. The pressure/temperature limits in this Bulletin or any applicable standard limitation should not be exceeded.
2. Fluorocarbon (FKM) is limited to 200°F / 93°C in hot water.
3. Ethylene Propylene (EPDM) is limited to 20 to 225°F / -7 to 107°C when used with Low Pressure Actuator.

Table 1. Body Sizes and End Connection Styles
BODY MATERIAL

NPS 3 and 4 / DN 80 and 100 Body Sizes

Cast Iron

NPT, CL125 FF or CL250 RF

CL125 FF or CL250 RF

WCC Steel(1)(2)

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

CL150 RF, CL300 RF, CL600 RF or PN 16 RF

CF8M Stainless steel(1)(2)

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

CL150 RF, CL300 RF, CL600 RF or PN 16 RF

CF3M Stainless steel(1)(2)

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

CL150 RF, CL300 RF, CL600 RF or PN 16 RF

1. Optional NACE construction available.
2. Constructions meet API 614 requirements.

2

END CONNECTION STYLE
NPS 1 and 2 / DN 25 and 50 Body Sizes

Bulletin 71.4:MR108
Introduction
The Type MR108 regulators are direct-operated,
backpressure, high-capacity, multi-purpose regulators.
They are designed to handle pressures up to 400 psig /
27.6 bar and temperatures up to 250°F / 121°C.
This product provides a fast, simple, reliable and
economical backpressure control in multi-purpose
applications suitable for different flow media including
liquid, air and gas. Applications include lube oil systems
and any application where speed of response is critical,
minimum differential pressure is a concern or fluid
is not free of impurities. Type MR108 backpressure
regulators with low-pressure actuators can be set up to
35 psig / 2.4 bar and the high-pressure actuator version
can be set to 150 psig / 10.3 bar for constructions with
Fluorocarbon (FKM) diaphragm and 300 psig / 20.7 bar
for constructions with Nitrile (NBR) diaphragm.
The units are available in 4 sizes, NPS 1 through 4 /
DN 25 through 100 and are available in several
end connection configurations to meet demands on
application requirements.
Available with a quick-opening cage for quick speed
of response and high flow capacity. The cage-guided
metal plug provides superior control and stability.
The Type MR108 with Steel or Stainless steel body
construction has been designed to meet API 614 as
required by lube oil manufacturers.

Features
Large Flow—Able to pass large flow rates with a
minimum pressure buildup.
Stability—The Type MR108 regulator’s cage-guided
metal plug design provides superior control stability of
delivery pressure.
Fast Response—Direct-operated for fast
response to meet the most demanding pressure and
flow requirements.
Easy Drain—Feature allows you to drain the
system without expensive spool pieces saving you
time and space.
Easy Bleed—Feature allows you to purge the air
trapped underneath the diaphragm when the highpressure regulator is installed in the upright position,
which improves speed of response.

Steel and Stainless Steel Constructions Meet
API 614 Requirements—Steel and Stainless steel
body constructions comply with the recommendations of
API Standard 614.
Available Constructions to Meet NACE MR01752003 and NACE MR0103 Requirements
for Sour Gas Service Capability—Optional
materials are available for applications handling
sour gases. These constructions comply with the
recommendations of NACE International Standards
MR0175 and MR0103.
Multiple Trim Materials Available—416, 316 and
316L Stainless steel options are available to meet
wider application requirements including demands
from lube oil and cooling water applications.
ANSI/FCI 70-3-2004 Class VI Shutoff—Soft-seat
valve plug seals for tight shutoff.
Multiple End Connection Options—Type MR108 is
available in several end connection configurations to
meet demands on application requirements.
P1 = P2 on High-Pressure Actuator—Inlet pressure
rating equals outlet pressure rating on high-pressure
actuator constructions up to 400 psig / 27.6 bar.

Principle of Operation
Refer to Figure 2. The Type MR108 is a multipurpose backpressure regulator. Upstream pressure
is registered externally through a 1/2 NPT control
line connection located at the low-pressure actuator
bonnet or high-pressure actuator lower casing. When
inlet pressure rises above the set pressure, the
pressure under the actuator diaphragm increases and
opens the regulator. This pressure overcomes the
regulator setting (which is set by the regulator control
spring). Through the action of the actuator stem, the
valve plug is pulled upward moving away from the seat
ring and allowing fluid to escape through the cage into
the downstream system. When inlet pressure drops
back to set pressure, pressure under the actuator
diaphragm decreases. The control spring and the
valve spring forces push the actuator stem downward,
the valve plug moves closer to the seat ring and the
flow decreases downstream as the regulator closes
in response to the decreased pressure underneath
the diaphragm.

3

Bulletin 71.4:MR108
SEAT RING

CAGE
VALVE SPRING
ACTUATOR STEM
VALVE PLUG

DIAPHRAGM
ACTUATOR

CONTROL SPRING

M1179

TYPE MR108 WITH LOW-PRESSURE ACTUATOR

SEAT RING

April 2010

Type MR108

Type MR108 Multi-Purpose, High-Pressure
Backpressure Regulator

CAGE

VALVE SPRING
ACTUATOR STEM
VALVE PLUG

DIAPHRAGM

ACTUATOR

CONTROL SPRING

M1182

INLET PRESSURE
OUTLET PRESSURE
ATMOSPHERIC PRESSURE

Figure 2. Type MR108 Backpressure Regulator Operational Schematic

4

M1182

TYPE MR108 WITH HIGH-PRESSURE ACTUATOR

Bulletin 71.4:MR108
Table 2. Backpressure Control Ranges

SPRING RANGE

ACTUATOR TYPE

Low Pressure

High Pressure

SPRING WIRE
DIAMETER

SPRING PART
NUMBER

SPRING
COLOR
CODE

In.

mm

White

0.44

11.2

psig

bar

5 to 14

0.34 to 0.97

GE42909X012

8 to 24

0.55 to 1.7

GE42910X012

Silver

0.50

12.7

12 to 30

0.83 to 2.1

GE42911X012

Orange

0.56

14.2

15 to 35

1.0 to 2.4

GE43002X012

Red

0.63

16.0

25 to 40

1.7 to 2.8

GE42906X012

Blue

0.33

8.38

35 to 70

2.4 to 4.8

GE42907X012

Green

0.38

9.65

55 to 120

3.8 to 8.3

GE42909X012

White

0.44

11.2

90 to 200(1)

6.2 to 13.8(2)

GE42910X012

Silver

0.50

12.7

175 to 300(1)

12.1 to 20.7(2)

GE43002X012

Red

0.63

16.0

MAXIMUM PRESSURE
OVER SETPOINT TO
AVOID INTERNAL PARTS
DAMAGE
psig
bar

SPRING FREE
LENGTH
In.

mm

9.70

20

1.4

120

8.3

246

1. Maximum setpoint is limited to 150 psig / 10.3 bar for constructions with Fluorocarbon (FKM) diaphragm.
2. Not applicable for constructions with Fluorocarbon (FKM) diaphragm.

Table 3. Construction Materials
PART

STANDARD

OPTIONAL

Body

WCC Steel(1)

Cast Iron, CF8M, CF3M Stainless steel
CF8M, CF3M Stainless steel

Body Flange

WCC Steel(1)

Actuator Casing - Low Pressure

AISI 1010 Steel(1)

316/316L Stainless steel

Actuator Casing - High Pressure

WCC Steel(1)

CF3M/CF8M Stainless steel

Internal Stiffener Plate

AISI 1010 Steel(1)

316/316L Stainless steel

Spring Case

WCC Steel

CF3M/CF8M Stainless steel

Spring Case Spacer

Zinc-plated Steel

Stainless steel

Cage

CF3M/CF8M (Quick Opening), CF8M (Linear) Stainless steel

Valve Plug and Seat Ring

316, 316L, S20910 (Nitronic 50)
Stainless steel (NPS 1 / DN 25 only)

416 Stainless steel

Closing Spring

Inconel X750
®

Stem

S17400 H1075 Stainless steel

Lower Diaphragm Support

S20910 (Nitronic 50) Stainless steel
S17400 H1075 Stainless steel

Diaphragm and Seals

Nitrile (NBR)

Fluorocarbon (FKM), Ethylene Propylene (EPDM)

Upper Diaphragm Plate

Cast Iron

Control/Set Spring

Steel Alloy(1)

Spring Seats

Zinc-plated Steel

Bolting

SA194 Grade B7/NCF (Body to Bonnet)
SAE Grade 5/NCF (Actuator)

Stainless steel

Adjusting Screw

Zinc-plated Steel

Stainless steel

1. Powder coated.

Table 4. Wide Open Flow and Sizing Coefficients
WIDE OPEN COEFFICIENTS

BODY SIZE

Line Size Equals Body Size

IEC SIZING COEFFICIENTS
Km

FL

XT

Fd

34.1

0.81

0.90

0.73

0.43

36.1

0.81

0.90

0.82

0.34

103.1

34.4

0.76

0.87

0.75

0.32

135.9

31.6

0.72

0.85

0.65

0.3

0.90

0.72

0.36

NPS

DN

Cg

Cv

1

25

597

17.5

2

50

1740

48.2

3

80

3540

4

100

4300

C1
Quick Opening Cage

Reduced Port Quick Opening Cage
2

50

1570

43.8

35.9

0.81

Inconel® is a mark owned by Special Metals Corporation.

5

Bulletin 71.4:MR108
Table 5. Maximum Inlet, Outlet and Emergency Casing Pressures(1)
MAXIMUM
INLET PRESSURE
BODY
MATERIAL

END
CONNECTION

Low-Pressure
Actuator
psig

bar

NPT
Cast Iron

WCC Steel

CF8M Stainless
steel

CF3M Stainless
steel

CL125 FF

psig

bar

340

23.4

Low-Pressure
Actuator
psig

bar

340

23.4

psig

bar

340

23.4

175

12.1

175

12.1

400

27.6

400

27.6

NPT

400

27.6

400

27.6

400

27.6

CL150 RF

245

16.9

245

16.9

245

16.9

400

27.6

400

27.6

400

27.6

4.8

70

4.8

psig

27.6

70

70

bar

High-Pressure
Actuator(2)

12.1

4.8

4.8

psig

Low-Pressure
Actuator

400

70

70

bar

High-Pressure
Actuator(2)

175

CL600 RF

4.8

High-Pressure
Actuator(2)

MAXIMUM EMERGENCY
CASING PRESSURE

CL250 RF

CL300 RF

70

MAXIMUM
OUTLET PRESSURE

4.8

PN 16 RF

245

16.9

245

16.9

245

16.9

PN 16/25/40 RF

400

27.6

400

27.6

400

27.6

NPT

400

27.6

400

27.6

400

27.6

CL150 RF

225

15.5

225

15.5

225

15.5

400

27.6

400

27.6

400

27.6

CL300 RF
CL600 RF

70

4.8

70

4.8

70

4.8

PN 16 RF

225

15.5

225

15.5

225

15.5

PN 16/25/40 RF

400

27.6

400

27.6

400

27.6

NPT

400

27.6

400

27.6

400

27.6

CL150 RF

185

12.7

185

12.7

185

12.7

400

27.6

400

27.6

400

27.6

PN 16 RF

185

12.7

185

12.7

185

12.7

PN 16/25/40 RF

400

27.6

400

27.6

400

27.6

CL300 RF
CL600 RF

70

4.8

70

4.8

70

4.8

1. Pressure ratings are based on a maximum operating temperature of 250°F / 121°C.
2. Maximum inlet, outlet and emergency pressures for constructions with Fluorocarbon (FKM) diaphragm are limited to 230 psig / 15.8 bar or the body rating limit, whichever is lower.

Overpressure Condition
Depending upon construction, backpressure control
ratings are from 5 to 300 psig / 0.34 to 20.7 bar.
The maximum inlet pressure can be found in
Table 5. System operation within these limitations
does not eliminate the possibility of damage from
external sources or from debris in the flow line. The
backpressure regulator should be inspected for damage
regularly and after any overpressure condition.

Installation
Note
Not all codes or regulations will
permit these units to be used as final
overpressure protection devices.
Vertical installation with the actuator installed directly
above or below the main valve is recommended but for
optimal performance the actuator should be installed
below the main valve. The use of a bleed valve is
recommended for liquid installations that require the
high pressure actuator to be mounted above the main
valve. The unit will operate in horizontal installations
6

with actuator on the side, however, this could result in
premature wear of parts. Orientation of the two vents
should always be down. Vents may be rotated after
regulator installation to reposition so that the vent
screens are down.
A control line must be installed to allow inlet pressure
to register on the actuator’s diaphragm. The size of the
control line is indicated in the Specification sections
above and should be installed four to eight pipe
diameter before the backpressure regulator and in an
area of pipe that is free of turbulence.
An instruction manual is provided with every regulator
shipped. Refer to this for detailed installation,
operation, adjustment and maintenance instructions.
The instruction manual includes a complete listing of
individual parts and recommended spare parts.

Applications
Note
A linear cage is recommended for
applications where low flow stability
is a concern but it will limit the overall
capacity of the regulator.

Bulletin 71.4:MR108
FILTER 2
PUMP 2

TYPE MR105 PRESSURE
REDUCING REGULATOR
TO EQUIPMENT
BEARINGS, SEALS OR
SERVO-CONTROLS

PUMP 1

FILTER 1

OIL TANK

TYPE MR108
BACKPRESSURE REGULATOR

Figure 3. Lube Oil Skid Diagram

Lube Oil Skids (Figure 3)
Lube oil skids maintain oil flow to bearings, seals and
servo-controls on critical turbomachinery assets such
as air and gas compressors, steam turbines, power
recovery turbines and power generating equipment.
These skids are essential in keeping lube oil clean
at all times and ensure maximum service life for the
equipment. Because it is critical to maintain a constant
flow and pressure of oil to the equipment, it is normally
equipped with two pumps – the main pump and the
auxiliary pump, which will take over in case of main
pump failure – and filters.
In normal condition, the skids operate in the
following manner:
  •	 Lube oil is stored in the tank at atmospheric pressure.
  •	 It is then fed to the main pump (Pump 1) which
pressurizes the lube oil.
  •	 Oil then goes through a filter.
  •	 After filtration, oil flow is split such that a fraction is
sent to a backpressure regulator to limit the supply
pressure to the pressure reducing regulator. 20%
of the pump rate flows through the backpressure
regulator, sending back oil to the oil tank.
  •	 The pressure reducing regulator decreases the
pressure to a safe and allowable range. Flow
through this regulator is 80% of pump rate.
  •	 Oil flows to large rotating equipment lubricating
bearings, e.g. turbines and compressors.
The loss of pressure or flow to the bearings or these
turbomachinery assets may shut down the equipment
or even the whole plant. Failure of the main pump or
filter results in the following upset operation:

  •	 Auxiliary pump (Pump 2) and filter system is brought
into operation while main pump is in operation.
  •	 Auxiliary pump ramp up rate is one second.
  •	 Auxiliary pump produces a pressure spike
that is beyond the limitations of the pressure
reducing regulator.
  •	 The backpressure regulator relieves the excess
pressure back to the oil tank. Flow rate is 120% of
total pump rate.
Main pump can now be shut down to allow repair of
the system. High capacity direct-operated regulators
are recommended for this type of application where
speed of response is critical. The Type MR108 can
provide fast response to the pressure spikes as
described above while maintaining a constant delivery
pressure of oil to the bearing.

Universal NACE Compliance
Optional materials are available for applications
handling sour gases. These constructions comply with
the recommendations of NACE International Sour
Service Standards.
The manufacturing processes and materials used
by Regulator Technologies assure that all products
specified for sour gas service comply with the
chemical, physical and metallurgical requirements of
NACE MR0175 and/or NACE MR0103. Customers
have the responsibility to specify correct materials.
Environmental limitations may apply and shall be
determined by the user.

7

Bulletin 71.4:MR108
Table 6. Typical Cv Coefficient With Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 Low-Pressure Actuator)
SPRING RANGE,
PART NUMBER,
COLOR CODE

RELIEF
PRESSURE
SETTING

Cv at % BUILDUP
NPS 1 / DN 25 Body

NPS 2 / DN 50 Body

NPS 3 / DN 80 Body

NPS 4 / DN 100 Body

psig

bar

10%

20%

30%

40%

10%

20%

30%

40%

10%

20%

30%

40%

10%

20%

30%

40%

5

0.34

5.76

10.7

13.8

16

12.3

24.6

33.9

41.8

26.5

41.5

59.4

74.0

23.2

32.9

44.4

54.1

10

0.69

11.2

15.8

16.9

17.2

23.2

40.7

48.2

48.2

40.3

71.1

94.0

103

34.1

54.8

79.2

96.9

8 to 24 psig /
0.55 to 1.7 bar
GE42910X012
(Silver)

10

0.69

7.28

13.0

15.2

16.4

16.6

29.2

40.8

47.6

29.9

50.0

69.6

85.0

28.6

44.4

60.0

75.5

20

1.4

11.7

15.6

16.7

16.9

28.0

47.1

48.2

48.2

47.7

76.8

97.1

103

44.2

73.5

98.1

124

12 to 30 psig /
0.83 to 2.1 bar
GE42911X012
(Orange)

15

1.0

6.57

12.3

15.5

16.8

16.7

29.1

41.9

48.2

30.1

51.3

68.6

81.6

30.9

48.8

66.7

83.3

25

1.7

12.1

15.7

17.3

17.5

25.0

43.1

48.2

48.2

42.3

67.0

87.6

101

43.1

72.9

98.6

124

30

2.1

12.8

16.1

17.0

17.0

27.1

45.5

48.2

48.2

46.4

73.4

95.8

103

46.1

80.4

113

132

15 to 35 psig /
1.0 to 2.4 bar
GE43002X012
(Red)

15

1.0

6.45

10.6

13.9

15.2

13.0

22.2

31.0

39.5

24.9

40.1

56.8

69.3

26.5

41.4

54.7

68.8

25

1.7

9.05

13.6

15.7

16.3

19.0

33.6

43.6

48.2

30.9

53.8

73.2

89.4

36.2

59.7

82.1

102

35

2.4

10.7

15.5

16.4

16.8

24.3

42.0

48.2

48.2

41.9

65.9

89.1

102

45.0

74.1

103

127

5 to 14 psig /
0.35 to 0.97 bar
GE42909X012
(White)

Table 7. Typical Cv Coefficient With Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 High-Pressure Actuator)
SPRING RANGE,
PART NUMBER,
COLOR CODE

 

8

RELIEF
PRESSURE
SETTING  

Cv at % BUILDUP
NPS 1 / DN 25 Body

NPS 2 / DN 50 Body

NPS 3 / DN 80 Body

NPS 4 / DN 100 Body

psig

bar

10%

20%

30%

40%

10%

20%

30%

40%

10%

20%

30%

40%

10%

20%

30%

40%

25 to 40 psig /
1.7 to 2.8 bar
GE42906X012
(Blue)

25

1.7

5.56

9.38

12.7

14.7

12.9

24.2

36.3

42.4

21.9

34.3

47.3

57.5

27.2

45.7

57.7

70.4

35

2.4

8.16

13.7

15.7

17.0

18.8

34.3

43.8

48.2

26.1

41.2

55.1

71.2

34.6

50.3

68.5

84.6

40

2.8

7.59

14.5

16.9

17.5

19.0

38.0

45.9

48.2

28.0

43.3

59.6

79.4

39.0

55.8

74.0

95.0

35 to 70 psig /
2.4 to 4.8 bar
GE42907X012
(Green)

35

2.4

5.54

10.4

14.5

15.5

13.6

23.0

33.1

41.2

21.7

34.2

43.7

53.2

29.1

44.3

57.4

68.1

50

3.4

8.02

13.5

15.8

17.0

16.1

32.4

42.7

47.4

25.6

38.2

52.3

68.2

33.1

49.1

66.3

84.4

70

4.8

10.3

15.8

17.1

17.5

24.4

41.1

48.2

48.2

27.9

46.8

69.3

87.8

35.5

57.6

83.5

109

55 to 120 psig /
3.8 to 8.3 bar
GE42909X012
(White)

55

3.8

6.01

11.7

14.7

16.1

14.0

24.6

36.0

42.9

23.7

33.8

44.6

57.4

29.7

42.2

56.4

71.0

75

5.2

7.58

14.2

16.2

17.0

16.7

31.4

42.9

48.2

25.2

38.3

55.7

71.4

31.3

48.6

67.2

87.3

120

8.3

13.2

16.6

17.5

17.5

28.7

43.9

48.2

48.2

30.0

54.1

77.6

96.8

37.3

65.6

92.4

117

90 to 200 psig /
6.2 to 13.8 bar
GE42910X012
(Silver)

100

6.9

7.92

13.8

16.0

16.9

16.4

29.8

40.5

48.0

22.8

35.3

50.0

64.1

28.8

44.2

60.8

75.6

150

10.3

12.7

16.0

16.9

17.1

21.5

39.1

46.8

48.2

26.4

47.7

68.1

87.7

34.5

58.8

82.5

106

200

14.8

14.7

16.8

17.3

17.3

27.4

43.9

48.2

48.2

32.9

58.6

80.6

97.9

40.6

72.3

104

130

175 to 300 psig /
12.1 to 20.7 bar
GE43002X012
(Red)

175

12.1

7.90

13.5

15.7

16.6

14.4

26.3

35.6

42.0

20.6

33.7

48.1

62.5

27.2

43.7

59.7

76.2

250

17.2

11.3

15.5

16.8

17.0

19.5

34.2

43.5

47.1

26.4

45.5

65.9

82

33.4

55.2

77.4

97.5

300

20.7

12.9

16.7

17.1

22.8

39.5

48.2

30.2

52.9

71.1

34.8

58.9

84.8

  -  Shaded areas indicate where pressure conditions exceed the pressure limit of the actuator.

Bulletin 71.4:MR108
Table 8. Typical Air Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 Low-Pressure Actuator)
CAPACITIES IN SCFH / Nm3/h OF AIR
RELIEF
SPRING RANGE, PRESSURE
PART NUMBER, SETTING
COLOR CODE

% Pressure Buildup Over Relief Setting
NPS 1 / DN 25 Body
10%

20%

NPS 2 / DN 50 Body

30%

40%

10%

20%

psig

bar

SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH

5

0.34

3100

84

6100

160

8200

220

9900

270

6800

180

10

0.69

9000

240

13,300

360

14,900

400

15,800

420

19,000

8 to 24 psig /
0.55 to 1.7 bar
GE42910X012
(Silver)

10

0.69

5800

160

10,900

290

13,400

360

15,100

400

20

1.4

14,300

380

20,200

540

22,800

610

24,200

12 to 30 psig /
0.83 to 2.1 bar
GE42911X012
(Orange)

15

1.0

6700

180

13,300

360

17,500

470

25

1.7

17,200

460

23,700

640

27,600

30

2.1

20,600

550

27,600

740

30,800

15 to 35 psig /
1.0 to 2.4 bar
GE43002X012
(Red)

15

1.0

6600

180

11,300

300

25

1.7

12,800

340

20,400

550

35

2.4

19,200

520

29,800

800

5 to 14 psig /
0.35 to 0.97 bar
GE42909X012
(White)

3

30%

40%

Nm /h

SCFH

Nm /h

14,300

380

20,600

550

26,500

710

510

35,300

940

46,100

1240

54,000

1450

13,600

370

25,300

680

37,100

990

45,300

1210

650

35,600

950

63,600

1700

79,100

2120

86,300

2310

20,000

530

17,600

470

32,500

870

49,200

1320

61,000

1640

740

29,500

790

37,100

990

68,000

1820

87,200

2340

99,900

2680

820

32,600

870

45,900

1230

82,000

2200

102,000

2740

112,000 3000

15,800

420

18,000

480

13,700

370

24,800

660

36,400

980

48,800

1310

25,100

670

27,300

730

28,300

760

53,000

1420

73,000

1960

89,800

2410

33,500

900

36,200

970

46,100

1230

85,000

2280

109,000

2920

124,000 3330

3

3

3

3

3

3

SCFH Nm3/h

- continued Table 8. Typical Air Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 Low-Pressure Actuator) (continued)
CAPACITIES IN SCFH / Nm3/h OF AIR
RELIEF
SPRING RANGE, PRESSURE
PART NUMBER, SETTING
COLOR CODE

% Pressure Buildup Over Relief Setting
NPS 3 / DN 80 Body
10%

20%

NPS 4 / DN 100 Body

30%

40%

10%

20%

30%

bar

SCFH

Nm /h

5

0.34

14,500

390

23,800

640

35,600

950

46,200

1240 12,500

330

18,400

490

26,000

700

32,900

880

10

0.69

32,400

870

60,200

1610

83,500

2240

99,800

2670 26,400

710

44,600

1200

67,400

1810

86,100

2310

8 to 24 psig /
0.55 to 1.7 bar
GE42910X012
(Silver)

10

0.69

24,100

640

42,300

1130

61,800

1660

78,900

2120 22,200

590

36,200

970

51,100

1370

67,100

1800

20

1.4

58,900

1580 100,000 2690 134,000 3590 154,000 4130 51,400 1380

90,400

2420 127,000 3410 169,000 4530

12 to 30 psig /
0.83 to 2.1 bar
GE42911X012
(Orange)

15

1.0

30,900

830

50,200

1350

25

1.7

60,600

1630 102,000 2730 141,000 3780 172,000 4600 57,900 1550 104,000 2780 148,000 3970 197,000 5270

30

2.1

75,600

2030 127,000 3410 176,000 4720 201,000 5400 70,100 1880 130,000 3480 194,000 5200 239,000 6410

15 to 35 psig /
1.0 to 2.4 bar
GE43002X012
(Red)

15

1.0

25,600

690

43,500

1170

690

42,700

1140

25

1.7

44,300

1190

81,900

2190 118,000 3160 152,000 4070 48,700 1300

85,000

2280 123,000 3310 162,000 4340

35

2.4

76,300

2050 128,000 3430 184,000 4930 223,000 5970 76,400 2050 134,000 3590 198,000 5310 259,000 6930

5 to 14 psig /
0.35 to 0.97 bar
GE42909X012
(White)

SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH Nm /h SCFH

40%

psig

3

3

55,600

1490

3

78,300

64,800

2100

1740

3

97,700

82,900

2620 30,200

2220 25,900

3

810

3

72,100

59,100

Nm /h SCFH Nm3/h
3

1930

1580

94,300

77,900

2530

2090

9

Bulletin 71.4:MR108
Table 9. Typical Air Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 High-Pressure Actuator)
CAPACITIES IN SCFH / Nm3/h OF AIR
SPRING RANGE,
PART NUMBER,
COLOR CODE

RELIEF
PRESSURE
SETTING

% Pressure Buildup Over Relief Setting
NPS 1 / DN 25 Body
10%

psig

bar

25 to 40 psig /
1.7 to 2.8 bar
GE42906X012
(Blue)

25
35

20%

NPS 2 / DN 50 Body

30%

40%

10%

20%

30%

40%

SCFH

Nm /h

SCFH

Nm /h

SCFH

Nm /h

SCFH

Nm /h

SCFH

Nm /h

SCFH

Nm /h

SCFH

Nm /h

1.7

7900

210

14,100

380

20,200

540

24,700

660

19,200

510

38,200

1000

60,600

2.4

14,700

390

26,300

700

32,000

860

36,700

980

35,700

960

69,300

1900

94,200

40

2.8

15,100

400

30,900

830

38,000

1000

43,000

1200

39,800

1100

85,300

2300

35 to 70 psig /
2.4 to 4.8 bar
GE42907X012
(Green)

35

2.4

9900

270

19,900

530

29,500

790

33,500

900

25,700

690

46,500

50

3.4

18,900

510

34,200

920

42,600

1100

48,700

1300

40,300

1100

86,800

70

4.8

31,900

860

52,900

1400

61,300

1600

68,600

1800

80,400

2200

55 to 120 psig /
3.8 to 8.3 bar
GE42909X012
(White)

55

3.8

15,300

410

31,900

850

42,800

1100

50,000

1300

37,700

1000

3

3

3

3

SCFH

Nm3/h

1600

74,800

2000

2500

111,000

3000

110,000

2900

127,000

3400

1200

71,200

1900

93,900

2500

2300

122,000

3300

144,000

3900

146,000

3900

189,000

5100

211,000

5700

71,300

1900

111,000

3000

141,000

3800

3

3

3

75

5.2

25,000

670

50,600

1400

61,400

1600

69,100

1900

58,500

1600

118,000

3200

173,000

4600

211,000

5700

120

8.3

65,700

1800

89,500

2400

102,000

2700

109,000

2900

152,000

4100

251,000

6700

302,000

8100

325,000

8700

90 to 200 psig /
6.2 to 13.8 bar
GE42910X012
(Silver)

100

6.9

33,500

900

63,000

1700

78,700

2100

88,600

2400

73,600

2000

144,000

3900

211,000

5600

267,000

7200

150

10.3

77,400

2100

106,000

2800

120,000

3200

130,000

3500

139,000

3700

274,000

7300

353,000

9500

404,000

10,800

200

14.8

117,000

3100

145,000

3900

162,000

4300

173,000

4600

231,000

6200

402,000

10,800

477,000

12,800

513,000

13,800

175 to 300 psig /
12.1 to 20.7 bar
GE43002X012
(Red)

175

12.1

55,600

1500

103,000

2800

129,000

3400

146,000

3900

107,000

2900

212,000

5700

311,000

8300

392,000

10,500

250

17.2

111,000

3000

166,000

4400

193,000

5200

211,000

5700

203,000

5500

387,000

10,400

532,000

14,300

618,000

16,600

300

20.7

151,000

4000

212,000

5700

235,000

6300

283,000

7600

532,000

14,300

704,000

18,900

 

  -  Shaded areas indicate where pressure conditions exceed the pressure limit of the actuator.

- continued Table 9. Typical Air Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 High-Pressure
Actuator) (continued)
CAPACITIES IN SCFH / Nm3/h OF AIR
SPRING RANGE,
PART NUMBER,
COLOR CODE

RELIEF
PRESSURE
SETTING

% Pressure Buildup Over Relief Setting
NPS 3 / DN 80 Body
10%

psig

bar

SCFH

25 to 40 psig /
1.7 to 2.8 bar
GE42906X012
(Blue)

25

1.7

35

2.4

40

20%

NPS 4 / DN 100 Body

30%

Nm3/h

SCFH

Nm3/h

31,400

840

52,200

47,500

1300

80,100

2.8

56,400

1500

35 to 70 psig /
2.4 to 4.8 bar
GE42907X012
(Green)

35

2.4

39,600

1100

50

3.4

61,200

70

4.8

87,700

55 to 120 psig /
3.8 to 8.3 bar
GE42909X012
(White)

55

3.8

61,100

75

5.2

84,200

40%

SCFH

Nm3/h

1400

76,100

2100

114,000

93,200

2500

66,400

1600
2400
1600
2300

SCFH

Nm3/h

SCFH

2000

97,700

2600

3000

156,000

4200

136,000

3700

192,000

1800

90,300

2400

98,000

2600

143,000

159,000

4300

252,000

93,700

2500

138,000

3700

Nm3/h

36,600

980

65,100

58,700

1600

90,900

5200

73,000

2000

116,000

3100

49,400

1300

3800

198,000

5300

73,700

6700

340,000

9100

104,000

132,000

3500

181,000

4800

215,000

5800

294,000

7900

8.3

151,000

4100

295,000

7900

455,000

12,200

608,000

100

6.9

97,500

2600

163,000

4400

249,000

6700

341,000

150

10.3

163,000

4400

319,000

8600

491,000

13,200

200

14.8

265,000

7100

513,000 13,800

762,000

175 to 300 psig /
12.1 to 20.7 bar
GE43002X012
(Red)

175

12.1

147,000

3900

260,000

250

17.2

263,000

7000

492,000 13,200

300

20.7

359,000

9600

682,000 18,300

10

30%

SCFH

120

7000

20%

Nm3/h

90 to 200 psig /
6.2 to 13.8 bar
GE42910X012
(Silver)

 

10%

40%

SCFH

Nm3/h

SCFH

Nm3/h

1700

86,800

2400

132,000

2300

112,000

3000

3500

172,000

112,000

3000

4600

158,000

4200

214,000

80,100

5700

2100

110,000

3000

138,000

3700

2000
2800

117,000

3100

169,000

4500

228,000

6100

182,000

4900

282,000

7600

393,000

10,500

71,400

1900

97,400

2600

109,000

2900

155,000

4200

208,000

5600

163,000

4400

241,000

6500

334,000

9000

16,300 175,000

4700

333,000

8900

505,000

13,500

687,000

18,400

115,000

3100

191,000

5100

282,000

7500

374,000

10,000

678,000

18,200 199,000

5300

366,000

9800

554,000

14,900

762,000

20,400

20,400

993,000

26,600 305,000

8200

590,000 15,800

914,000

24,500

401,000

10,800

559,000

15,000 180,000

4800

314,000

463,000

12,400

770,000

20,600 1,030,000 27,600 310,000

8300

557,000 14,900

843,000

22,600

990,000

26,500

  -  Shaded areas indicate where pressure conditions exceed the pressure limit of the actuator.

9100

8400

384,000 10,300 707,000 18,900 1,100,000

29,500

1,224,000 32,800
634,000

17,000

1,140,000 30,600

Bulletin 71.4:MR108
Table 10. Typical Water Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 Low-Pressure Actuator)
CAPACITIES IN GPM / LPM OF WATER
RELIEF
SPRING RANGE, PRESSURE
PART NUMBER,
SETTING
COLOR CODE

5 to 14 psig /
0.35 to 0.97 bar
GE42909X012
(White)
8 to 24 psig /
0.55 to 1.7 bar
GE42910X012
(Silver)
12 to 30 psig /
0.83 to 2.1 bar
GE42911X012
(Orange)

15 to 35 psig /
1.0 to 2.4 bar
GE43002X012
(Red)

% Pressure Buildup Over Relief Setting
NPS 1 / DN 25 Body
10%

20%

NPS 2 / DN 50 Body

30%

40%

10%

20%

30%

40%

psig

bar

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

5

0.34

15

57

27

100

36

140

40

150

27

100

50

190

75

280

96

360

10

0.69

32

120

52

200

61

230

66

250

84

320

140

510

180

670

210

790

10

0.69

29

110

44

170

56

210

62

230

58

220

100

380

140

510

160

610

20

1.4

60

230

81

310

89

340

92

350

130

470

210

810

270

1000

300

1100

15

1.0

31

120

51

190

65

250

74

280

76

290

130

500

180

680

220

840

25

1.7

50

190

79

300

97

370

100

390

130

500

230

860

280

1100

330

1200

30

2.1

61

230

95

360

110

410

120

440

160

600

270

1000

330

1200

360

1400

15

1.0

34

130

49

190

64

240

72

270

57

220

99

370

140

530

180

660

25

1.7

46

170

73

280

88

330

99

370

100

390

180

670

240

920

300

1100

35

2.4

64

240

100

380

120

440

120

470

160

590

270

1000

340

1300

390

1500

- continued -

Table 10. Typical Water Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 Low-Pressure
Actuator) (continued)
CAPACITIES IN GPM / LPM OF WATER
RELIEF
SPRING RANGE, PRESSURE
PART NUMBER, SETTING
COLOR CODE

5 to 14 psig /
0.35 to 0.97 bar
GE42909X012
(White)
8 to 24 psig /
0.55 to 1.7 bar
GE42910X012
(Silver)

12 to 30 psig /
0.83 to 2.1 bar
GE42911X012
(Orange)

15 to 35 psig /
1.0 to 2.4 bar
GE43002X012
(Red)

% Pressure Buildup Over Relief Setting
NPS 3 / DN 80 Body
10%

20%

NPS 4 / DN 100 Body

30%

40%

10%

20%

30%

40%

psig

bar

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

5

0.34

51

190

92

350

130

480

160

620

69

260

120

440

170

620

210

800

10

0.69

120

470

210

790

280

1100

370

1400

150

560

270

1000

370

1400

460

1700

10

0.69

90

340

150

570

210

790

270

1000

110

410

190

720

270

1000

350

1300

20

1.4

190

720

330

1200

450

1700

520

2000

250

940

430

1600

570

2200

680

2600

15

1.0

110

410

190

710

260

970

330

1200

140

530

240

900

340

1300

440

1600

25

1.7

200

750

320

1200

460

1700

560

2100

250

950

430

1600

590

2200

740

2800

30

2.1

240

910

390

1500

540

2000

630

2400

300

1100

520

2000

710

2700

820

3100

15

1.0

91

340

150

580

210

810

270

1000

120

470

200

740

280

1000

360

1400

25

1.7

160

590

270

1000

380

1400

480

1800

200

750

350

1300

490

1900

630

2400

35

2.4

220

840

390

1500

540

2000

650

2500

280

1100

490

1900

700

2600

890

3400

11

Bulletin 71.4:MR108
Table 11. Typical Water Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 High-Pressure Actuator)
CAPACITIES IN GPM / LPM OF WATER
SPRING RANGE,
PART NUMBER,
COLOR CODE

25 to 40 psig /
1.7 to 2.8 bar
GE42906X012
(Blue)
35 to 70 psig /
2.4 to 4.8 bar
GE42907X012
(Green)
55 to 120 psig /
3.8 to 8.3 bar
GE42909X012
(White)

RELIEF
PRESSURE
SETTING

% Pressure Buildup Over Relief Setting
NPS 1 / DN 25 Body
10%

20%

NPS 2 / DN 50 Body

30%

40%

10%

20%

30%

40%

psig

bar

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

25

1.7

30

110

63

240

84

320

97

370

68

260

120

440

170

650

230

LPM
870

35

2.4

46

170

94

360

110

420

120

450

90

340

190

730

240

920

310

1170

40

2.8

69

260

100

390

120

450

130

480

110

400

190

730

280

1050

350

1310

35

2.4

37

140

74

280

95

360

110

410

82

310

150

570

200

760

260

990

50

3.4

59

220

100

390

130

470

140

510

130

500

220

840

310

1180

380

1430

70

4.8

92

350

140

510

150

580

160

610

160

590

280

1070

400

1510

480

1830

55

3.8

52

200

99

370

120

470

140

520

110

400

180

700

260

980

330

1230

75

5.2

96

360

140

530

160

610

170

640

150

560

250

940

340

1290

440

1670

120

8.3

150

580

190

730

210

780

220

810

220

820

390

1470

550

2080

650

2460

90 to 200 psig /
6.2 to 13.8 bar
GE42910X012
(Silver)

100

6.9

90

340

140

540

170

640

190

700

140

540

260

970

380

1420

480

1820

150

10.3

140

540

200

740

220

840

230

880

210

780

390

1480

550

2080

690

2610

200

14.8

190

730

240

920

260

970

270

1020

290

1110

510

1930

730

2760

810

3070

175 to 300 psig /
12.1 to 20.7 bar
GE43002X012
(Red)

175

12.1

100

390

170

660

210

800

240

900

170

660

310

1160

440

1650

570

2150

250

17.2

160

620

240

890

270

1020

290

1100

250

950

430

1640

650

2460

770

2900

300

20.7

200

750

270

1020

300

1130

290

1090

540

2040

750

2820

 

  -  Shaded areas indicate where pressure conditions exceed the pressure limit of the actuator.

- continued Table 11. Typical Water Capacities with Quick Opening Cage - Setpoint Made at 10% Flow (For Type MR108 High-Pressure
Actuator) (continued)
CAPACITIES IN GPM / LPM OF WATER
SPRING RANGE,
PART NUMBER,
COLOR CODE

RELIEF
PRESSURE
SETTING

% Pressure Buildup Over Relief Setting
NPS 3 / DN 80 Body
10%

20%

NPS 4 / DN 100 Body

30%

40%

10%

20%

30%

40%

psig

bar

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

GPM

LPM

25 to 40 psig /
1.7 to 2.8 bar
GE42906X012
(Blue)

25

1.7

110

430

170

650

230

870

280

1060

140

530

210

810

290

1090

360

1370

35

2.4

150

570

240

890

330

1260

410

1550

170

640

270

1000

360

1370

470

1780

40

2.8

170

640

270

1000

350

1340

450

1680

200

750

310

1190

420

1570

530

2000

35 to 70 psig /
2.4 to 4.8 bar
GE42907X012
(Green)

35

2.4

120

470

190

730

260

990

320

1220

150

580

230

860

310

1170

390

1480

50

3.4

180

670

270

1020

370

1400

470

1770

210

780

320

1230

430

1640

550

2060

70

4.8

220

830

370

1390

500

1900

620

2340

270

1020

430

1630

590

2240

750

2850

55 to 120 psig /
3.8 to 8.3 bar
GE42909X012
(White)

55

3.8

160

590

250

950

330

1260

430

1610

200

750

300

1140

410

1540

510

1930

75

5.2

200

750

320

1220

450

1720

560

2130

250

940

390

1480

530

2010

670

2530

120

8.3

310

1170

500

1880

670

2550

850

3210

380

1450

590

2240

820

3080

1070

4030

90 to 200 psig /
6.2 to 13.8 bar
GE42910X012
(Silver)

100

6.9

220

840

360

1350

480

1810

590

2240

280

1070

430

1630

580

2200

740

2820

150

10.3

310

1170

510

1920

700

2650

880

3320

390

1460

610

2310

820

3110

1090

4140

200

14.8

410

1540

640

2440

910

3450

1190

4490

480

1820

780

2940

1140

4300

1460

5530

175 to 300 psig /
12.1 to 20.7 bar
GE43002X012
(Red)

175

12.1

280

1070

450

1690

590

2250

750

2850

360

1370

540

2020

720

2720

930

3500

250

17.2

390

1490

620

2330

850

3200

1090

4130

480

1810

760

2870

1070

4050

1400

5300

300

20.7

450

1700

730

2770

1030

3880

540

2060

900

3390

1310

4940

 

12

  -  Shaded areas indicate where pressure conditions exceed the pressure limit of the actuator.

Bulletin 71.4:MR108
1/4 NPT PLUG OR DRAIN
VALVE CONNECTION

A

G

1/2 NPT CONTROL LINE
CONNECTION

D

1/4 NPT

1/2 NPT
VENT CONNECTION

19.5 / 495

13.1 / 333
R

(TRIM REMOVAL CLEARANCE)

ERAA00137

IN. /
mm

Figure 4. Type MR108 with Low-Pressure Actuator Dimensions
Table 12. Type MR108 with Low-Pressure Actuator Dimensions
DIMENSIONS
In. / mm

Body Size

A
D

G

R

7.62 / 194

8.4 / 213

2.9 / 74

3.6 / 91

11.25 / 286

10.25 / 260

8.9 / 226

3.5 / 89

4.3 / 109

12.50 / 317

13.25 / 337

12.48 / 317

10.2 / 259

4.2 / 107

5.3 / 135

14.50 / 368

15.50 / 394

13.78 / 350

11.5 / 292

5.3 / 135

6.5 / 165

NPS

DN

NPT

CL125 FF /
CL150 RF

CL250 RF /
CL300 RF

CL600 RF

PN 16/25/40 RF

1

25

8.25 / 210

7.25 / 184

7.75 / 197

8.25 / 210

2

50

11.25 / 286

10.0 / 254

10.50 / 267

3

80

----

11.75 / 298

4

100

----

13.88 / 353

13

Bulletin 71.4:MR108
A

G

D
1/4 NPT PLUG OR DRAIN
VALVE CONNECTION

1/4 NPT

1/2 NPT CONTROL
LINE CONNECTION

1/8 NPT BLEED VALVE
(OPTIONAL)
18.2 /
462

1/2 NPT
VENT CONNECTION

3.4 /
86
R

4.4 /
112

(TRIM REMOVAL CLEARANCE)
IN. /
mm

ERAA00138

Figure 5. Type MR108 with High-Pressure Actuator Dimensions
Table 13. Type MR108 with High-Pressure Actuator Dimensions
DIMENSIONS
In. / mm

Body Size

A
D

G

R

7.62 / 194

9.9 / 251

2.9 / 74

3.6 / 91

11.25 / 286

10.25 / 260

10.3 / 262

3.5 / 89

4.3 / 109

12.50 / 317

13.25 / 337

12.48 / 317

11.6 / 295

4.2 / 107

5.3 / 135

14.50 / 368

15.50 / 394

13.78 / 350

13.0 / 330

5.3 / 135

6.5 / 165

NPS

DN

NPT

CL125 FF /
CL150 RF

CL250 RF /
CL300 RF

CL600 RF

PN 16/25/40 RF

1

25

8.25 / 210

7.25 / 184

7.75 / 197

8.25 / 210

2

50

11.25 / 286

10.0 / 254

10.50 / 267

3

80

----

11.75 / 298

4

100

----

13.88 / 353

14

Bulletin 71.4:MR108
Ordering Information
Use the Specifications section on page 2 and
carefully review the description to the right of each
specification. Use this information to complete
the Ordering Guide on this page. Specify the

desired selection wherever there is a choice to be
made. Then send the Ordering Guide to your local
Sales Office.

Ordering Guide
Body Size (Select One)
    NPS 1 / DN 25
    NPS 2 / DN 50
    NPS 3 / DN 80
    NPS 4 / DN 100
Actuator Type (Select One)
    Low Pressure
    High Pressure
Body Material and End Connection Style (Select One)
  Cast Iron
     NPT (1 or 2 NPT only)
     CL125 FF
     CL250 RF
  WCC Steel
     NPT (1 or 2 NPT only)
     CL150 RF
     CL300 RF
     CL600 RF
     PN 16 RF
     PN 16/25/40 RF (NPS 1 or 2 / DN 25 or 50 only)
  CF8M Stainless Steel
     NPT (1 or 2 NPT only)
     CL150 RF
     CL300 RF
     CL600 RF
     PN 16 RF
     PN 16/25/40 RF (NPS 1 or 2 / DN 25 or 50 only)
  CF3M Stainless Steel
     NPT (1 or 2 NPT only)
     CL150 RF
     CL300 RF
     CL600 RF
     PN 16 RF
     PN 16/25/40 RF (NPS 1 or 2 / DN 25 or 50 only)

Diaphragm, O-rings and Seal Materials (Select One)
    Nitrile (NBR)
    Fluorocarbon (FKM)
    Ethylene Propylene (EPDM)
Actuator Type and Set Pressure Range (Select One)
  Low-Pressure Actuator
     5 to 14 psig / 0.35 to 0.97 bar, White
     8 to 24 psig / 0.55 to 1.7 bar, Silver
     12 to 30 psig / 0.83 to 2.1 bar, Orange
     15 to 35 psig / 1.0 to 2.4 bar, Red
  High-Pressure Actuator
     25 to 40 psig / 1.7 to 2.8 bar, Blue
     35 to 70 psig / 2.4 to 4.8 bar, Green
     55 to 120 psig / 3.8 to 8.3 bar, White
     90 to 200 psig / 6.2 to 13.8 bar, Silver(1)
     175 to 300 psig / 12.1 to 20.7 bar, Red(2)
Optional
    Inlet Pressure Gauge Tap on Body
    Pressure-Loaded Actuator
    Drain Valve
    NACE Construction
    Bleed Valve (For High-Pressure Actuator Only)
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.

1. Maximum setpoint is limited to 150 psig / 10.3 bar for constructions with Fluorocarbon (FKM) diaphragm.
2. Not applicable for constructions with Fluorocarbon (FKM) diaphragm.

15

Bulletin 71.4:MR108
Ordering Guide (continued)

Specification Worksheet
Application:
Specific Use
Line Size
Fluid Type
Specific Gravity
Temperature
Pressure:
Maximum Inlet Pressure
Minimum Inlet Pressure
Set Pressure
Maximum Flow
Accuracy Requirements:
Less Than or Equal To:
5%
10%
20%
40%

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.

Construction Material Requirements (if known):

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

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.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 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., 2010, 2014; All Rights Reserved



---

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