Emerson Mr95 Series Pressure Reducing Regulators Installation Guide

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Installation Guide
English – July 2014

MR95 Series

This Installation Guide provides instructions for installation, startup
and adjustment. To receive a copy of the Instruction Manual, contact
your local Sales Office or view a copy at www.fisherregulators.com.
For further information refer to MR95 Series Industrial Pressure
Regulators Instruction Manual, D103587X012.

P.E.D. Category
This product may be used as a safety accessory with pressure
equipment in the following Pressure Equipment Directive 97/23/EC
categories. It may also be used outside of the Pressure Equipment
Directive using Sound Engineering Practice (SEP) per table below.
TYPE

PRODUCT SIZE

body material

CATEGORY

MR95L/
MR95LD

1/4 NPT, DN 15 to 25 /
1/2 to 1-inch

All

SEP

MR95H/
MR95HD

MR95HP/
MR95HT

1/4 NPT, DN 15 to 25 /
1/2 to 1-inch

All

SEP

Cast Iron

I

Steel and
Stainless Steel

II

1/4 NPT, DN 15 to 25 /
1/2 to 1-inch

All

SEP

DN 40 and 50 /
1-1/2 and 2-inch

Steel and
Stainless Steel

II

DN 40 and 50 /
1-1/2 and 2-inch

	
Body Materials:
	
  Gray Cast Iron: -29 to 208°C / -20 to 406°F
	  WCC Steel: -29 to 343°C / -20 to 650°F
	  LCC Steel: -40 to 343°C / -40 to 650°F
	
  Stainless Steel, Monel® and Hastelloy® C:
	 
-40 to 288°C / -40 to 550°F
	
  Aluminum-Bronze: -40 to 260°C / -40 to 500°F
Pressure Registration
	
Internal or External
Shutoff Classification Per ANSI/FCI 70-3-2004
Metal Seats: Class IV
PTFE: Class IV
Elastomer Seats: Class VI or better

Installation
!

Specifications
Available Constructions
	
Type MR95L: Low pressure regulator for 0.14 to 2.1 bar /
2 to 30 psig outlet pressures
	
Type MR95H: High pressure regulator for 0.34 to 10.3 bar /
5 to 150 psig outlet pressures
	
Type MR95HP: High pressure regulator for 1.0 to 27.6 bar /
15 to 400 psig outlet pressures (soft-seated)
	
Type  MR95HT: High pressure/high temperature regulator for
1.0 to 20.7 bar / 15 to 300 psig outlet pressures (metal seat)
and up to 343°C / 650°F
	
Type MR95LD: Low pressure differential regulator for
0.14 to 2.1 bar / 2 to 30 psi differential pressures with
handwheel and packing box
	
Type  MR95HD: High pressure differential regulator for
0.34 to 10.3 bar / 5 to 150 psi differential pressures with
handwheel and packing box
Body and Orifice Sizes
	
1/4 NPT body: 7.22 mm / 0.284-inch orifice
	
DN 15 / 1/2-inch body: 10.56 mm / 0.416-inch orifice
	
DN 20 and 25 / 3/4 and 1-inch bodies:
16.02 mm / 0.631-inch orifice
	
DN 40 and 50 / 1-1/2 and 2-inch bodies (not available for
Types MR95L and MR95LD): 29 mm / 1.142-inch orifice
End Connection Styles
	NPT, SWE and Welded and Integral CL150 RF,
CL300 RF, CL600 RF and PN 16/25/40 RF; all sizes are
fabricated with slip-on flanges (for welded end connections)
and are EN flanged 356-mm face-to-face (14-inch face-to-face)
Maximum Cold Working Pressures of Body Size and Materials(1)(2)
	
See Table 2
Outlet and Differential Pressure Ranges
	
See Table 1

Temperature Capabilities(1)
	
Diaphragm and Seat Materials:
	 
Nitrile (NBR) and Neoprene (CR): -40 to 82°C / -40 to 180°F
	  Fluorocarbon (FKM)(3): -18 to 149°C / 0 to 300°F
	  Ethylenepropylene (EPDM): -7 to 135°C / 20 to 275°F
	
  Perfluoroelastomer (FFKM): -18 to 218°C / 0 to 425°F
	
  Polytetrafluoroethylene (PTFE): -40 to 204°C / -40 to 400°F
	
  Stainless Steel (SST): -40 to 343°C / -40 to 650°F

(1)

Warning

Only qualified personnel shall install or service
a regulator. Regulators should be installed,
operated and maintained in accordance
with international and applicable codes and
regulations and Emerson Process Management
Regulator Technologies, Inc. instructions.
If the regulator vents fluid or a leak develops in
the system, it indicates that service is required.
Failure to take the regulator out of service
immediately may create a hazardous condition.
Personal injury, equipment damage or leakage
due to escaping fluid or bursting of pressure
containing parts may result if this regulator
is overpressured or is installed where service
conditions could exceed the limits given in
the Specifications section or where conditions
exceed any ratings of the adjacent piping or
piping connections.
To avoid such injury or damage, provide
pressure- relieving or pressure-limiting devices
(as required by the appropriate code, regulation
or standard) to prevent service conditions from
exceeding limits.
Additionally, physical damage to the regulator
could result in personal injury and property
damage due to escaping fluid. To avoid such
injury and damage, install the regulator in a
safe location.
Clean out all pipelines before installation of the regulator and
check to be sure the regulator has not been damaged or has
collected foreign material during shipping. For NPT bodies,
apply pipe compound to the external pipe threads. For flanged
bodies, use suitable line gaskets and approved piping and bolting
practices. Install the regulator in any position desired, unless
otherwise specified, but be sure flow through the body is in the
direction indicated by the arrow on the body.

Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.
1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. The pressure limits given are based on the body size and body materials only. Actual pressure limits of the assembled regulator may decrease and vary depending on the
temperature, body end connection, diaphragm, seat and/or trim material of the regulator.
3. Fluorocarbon (FKM) is limited to 93°C / 200°F hot water.

www.fisherregulators.com

D103587X014

Introduction

MR95 Series
Table 1. Outlet and Differential Pressure Ranges
BODY SIZE

TYPE
MR95L and MR95LD

DN

Inch

15, 20 and 25

1/4 NPT, 1/2, 3/4 and 1

15, 20 and 25

1/4 NPT, 1/2, 3/4 and 1

40 and 50

1-1/2 and 2

15, 20 and 25

1/4 NPT, 1/2, 3/4 and 1

40 and 50

1-1/2 and 2

15, 20 and 25

1/4 NPT, 1/2, 3/4 and 1

40 and 50

1-1/2 and 2

OUTLET OR DIFFERENTIAL PRESSURE RANGE(1)
bar
psi/psig
0.14 to 0.41
2 to 6
0.34 to 1.0
5 to 15
0.90 to 2.1
13 to 30
1.0 to 2.1
15 to 30
1.7 to 5.2
25 to 75
4.8 to 10.3
70 to 150
0.34 to 5.5
5 to 80
4.1 to 8.3
60 to 120
6.9 to 9.7
100 to 140
8.3 to 10.3
120 to 150
1.0 to 6.9
15 to 100
5.5 to 20.7
80 to 300
1.0 to 6.9
15 to 100
4.1 to 17.9
60 to 260
1.0 to 6.9
15 to 100
5.5 to 27.6
80 to 400
1.0 to 6.9
15 to 100
4.1 to 20.7
60 to 300

MR95H and MR95HD

MR95HT

MR95HP

1. For Types MR95LD and MR95HD regulators, the pressure ranges indicate the differential pressure that can be obtained with the indicated spring. The differential pressure (spring
setting) is added to the spring case loading pressure to determine the actual outlet pressure.

Table 2. Maximum Cold Working Pressures of Body Size and Material(1)(2)
TYPE

MR95L/
MR95LD
MR95H/
MR95HD

Body Size

All available sizes

All available sizes

Body materials

Maximum Inlet
Pressure

Maximum OUTlet
Pressure

Maximum spring case
Pressure

bar

psig

bar

psig

bar

psig

Gray Cast Iron

17.2

250

3.4

50

3.4

50

WCC/LCC Steel; CF8M/CF3M Stainless Steel;
Monel®(3); Hastelloy® C(3)

20.7

300

8.6

125

8.6

125

Gray Cast Iron

17.2

250

17.2

250

17.2

250

WCC/LCC Steel; CF8M/CF3M Stainless Steel;
Monel®(3); Hastelloy® C(3); Aluminum-Bronze(3)

20.7

300

20.7

300

20.7

300

WCC/LCC Steel

68.9

1000

41.4

600

20.7

300

MR95HP

All available sizes

CF8M/CF3M Stainless Steel; Monel®(3);
Hastelloy® C(3); Aluminum-Bronze(3)

68.9

1000

37.9

550

20.7

300

WCC/LCC Steel

41.4

600

41.4

600

20.7

300

MR95HT

1/4 NPT and
DN 15 to 25 /
1/2 to 1-inch

CF8M/CF3M Stainless Steel; Monel®(3);
Hastelloy® C(3); Aluminum-Bronze(3)

41.4

600

37.9

550

20.7

300

DN 40 and 50 /
1-1/2 and 2-inch

WCC/LCC Steel; CF8M/CF3M Stainless Steel;
Monel®; Hastelloy® C; Aluminum-Bronze

41.4

600

31.0

450

20.7

300

1. The pressure/temperature limits in this Installation Guide and any applicable standard or code limitation should not be exceeded.
2. The pressure limits given are based on the body size and body materials only. Actual pressure limits of the assembled regulator may decrease and vary depending on the
temperature, body end connection, diaphragm, seat and/or trim material of the regulator.
3. Not available for 1/4 NPT body size.

Note
It is important that the regulator be installed
so that the vent hole in the spring case
is unobstructed at all times. For outdoor
installations, the regulator should be located
away from vehicular traffic and positioned
so that water, ice and other foreign materials
cannot enter the spring case through the vent.
Avoid placing the regulator beneath eaves
or downspouts and be sure it is above the
probable snow level.

Overpressure Protection
The recommended pressure limitations are stamped on the
regulator nameplate. Some type of overpressure protection
is needed if the actual inlet pressure exceeds the maximum
operating outlet pressure rating. Overpressure protection should
also be provided if the regulator inlet pressure is greater than the
safe working pressure of the downstream equipment.
Regulator operation below the maximum pressure limitations does
not preclude the possibility of damage from external sources or
debris in the line. The regulator should be inspected for damage
after any overpressure condition.
Monel® is a mark owned by Special Metals Corporation.
Hastelloy® C is a mark owned by Haynes International, Inc.

2

Startup
The regulator is factory set at approximately the midpoint of the
spring range or the pressure requested, so an initial adjustment
may be required to give the desired results. With proper
installation completed and relief valves properly adjusted, slowly
open the upstream and downstream shutoff valves.

Adjustment
To change the outlet pressure, loosen the jam nut and turn
the adjusting screw clockwise to increase outlet pressure or
counterclockwise to decrease it. Monitor the outlet pressure
with a test gauge during the adjustment. Tighten the jam nut to
maintain the desired setting.

Taking Out of Service (Shutdown)
!

Warning

To avoid personal injury resulting from sudden
release of pressure, isolate the regulator from all
pressure before attempting disassembly.

MR95 Series
50
L2

15

17

41

2

9

L2

11

21C

T

21B

22

L1

63

OR(3)

L2

5

L2

35

32
37

L1

40

42

11

9

2

4A

6B

1
METAL DIAPHRAGM OPTION

6
3
63

L4

52

12

20

26

L1

6C

12

4

OR(3)

19

L2

8

7

COMPOSITE SEAT OPTION

18

34

39

L2(2) 16

L4

13

44

36

43

4B

20
3

L2

TEE-HANDLE OPTION

1
6

33

L3

12

7
26

L2

21A

L2(2) 16

4

SEALED ADJUSTING
SCREW OPTION

38

5

L2

L2

L1

6A
CONTROL LINE OPTION
12
64

4B

18
METAL DIAPHRAGM OPTION

19

52

6B

4A

6C

L1

6A

COMPOSITION SEAT OPTION

CONTROL LINE OPTION

GF04918

GF04915

apply lubricant or sealant(1):
T = thread locker
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE
L2 = anti-seize compound
L4 = GRAPHITE SEALANT

Figure 1. Type MR95L, 1/4 NPT and DN 15 to 25 /
1/2 to 1-inch Body Sizes Assembly

apply lubricant(1):
L1 = GENERAL PURPOSE PTFE OR LITHIUM GREASE
L2 = anti-seize compound
L4 = GRAPHITE SEALANT

Figure 2. Type MR95HD, 1/4 NPT and DN 15 to 50 /
1/2 to 2-inch Body Sizes Assembly

Parts List
Key 	Description

Key 	Description

1	 Body
2	 Spring Case
3*	 Orifice
4*	 Valve Plug, Metal seat
4*	 Disk Holder Assembly, Composition seat
4a	 Disk Holder
4b	 Disk
4c	 O-ring (not shown)
5	 Valve Plug Guide
6	 Stem/Stem Assembly
6a	 Stem
6b	 Pusher Plate
6b	 O-ring
6c	 O-ring
7	 Stem Guide Bushing
8	 Lower Spring Seat
9	 Upper Spring Seat
10	Pusher Post, (not shown)
11	 Control Spring
12*	 Diaphragm (2 required for metal, FKM and EPDM diaphragms)(4)
13	 Nameplate

14*	Diaphragm Protector (not shown)
15	 Adjusting Screw
16	 Cap Screw
	  Types MR95L and MR95LD
	   DN 15 / 1/4 NPT and 1/2-inch bodies - 10 required
	   DN 20 and 25 / 3/4 and 1-inch bodies - 12 required
	  Types MR95H and MR95HD
	   1/4 NPT Body - 6 required
	   DN 15 to 50 / 1/2 to 2-inch bodies - 8 required
	  Types MR95HP and MR95HT
	   1/4 NPT Body - 6 required
	   DN 15 to 50 / 1/2 to 2-inch bodies - 8 required	
17	 Jam Nut
18	 Nameplate Drive Screw (4 required)
19*	 Diaphragm Gasket (2 required for pressure loaded spring case)
20	 Pitot Tube (for constructions without control line)
21	Diaphragm Head Assembly (not shown)
21a	 Diaphragm Head
21b	 Lower Spring Seat
21c	 Screw
21	Diaphragm Head (2 required) (not shown)

*Recommended Spare Part
1. Lubricants and sealants must be selected such that they meet the temperature requirements.
2. Apply L2 (anti-seize compound) on key 16 for Stainless steel bolts.
3. Apply L4 (graphite sealant) instead of L1 (general purpose PTFE or lithium grease) on key 63 for graphite ring.
4. Only one metal diaphragm is needed for Types MR95L and MR95LD with 1/4 NPT body size and 0.14 to 0.41 bar / 2 to 6 psi spring range.

3

MR95 Series
Parts list (continued)
key description

key description

22
23
26
27
27
29*
31
32
33
34
35
36
37*
38
39
40
41
41

42
43
44
45*
47
48
49
50*
51
62

Adjusting Screw Assembly (Tee Handle Adjustment)
Handwheel (not shown)
Inner Valve Spring
Inner Valve Base (not shown)
Inner Valve Base Assembly (not shown)
Gasket (2 required) (not shown)
Locknut (not shown)
Stuffing Box
Adjusting Screw
Packing Follower
Stuffing Box Nut
Packing (3 required)
Stuff Box Gasket
Handwheel/Handle
Internal Adaptor
External Adaptor
Machine Screw
Jam Nut

Spring
Washer
Washer
O-ring (2 required for Type MR95HD only) (not shown)
NACE Tag (not shown)
Tag Wire (not shown)
Lockwasher (not shown)
Sealing Washer
Vent, Type Y602-12 (not shown)
Adaptor (Types MR95L and MR95LD:
2 gauges - 2 required; 1 gauge - 1 required) (not shown)
63* Bottom Plug Seal
64 Flow Arrow
65 Pipe Plug (not shown)
66 Inlet Pressure Gauge (not shown)
67 Outlet Pressure Gauge (not shown)
69 ATEX Tag (not shown)
70 PED Tag (not shown)

*Recommended Spare Part

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

The distinctive diamond shape cast into every spring
case uniquely identifies the regulator as part of the
Fisher® brand and assures you of the highest-quality
engineering, durability, performance, and support.

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	specifi	cations	
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., 2014; All Rights Reserved



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