Emerson FISHER MR108 Series User manual

D103247XUS2
Installation Guide
English – March 2015 Type MR108
www.sherregulators.com
Introduction
This installation guide provides instructions for
installation, startup and adjustment. To receive a copy
of the instruction manual, contact your local Sales
Ofce or view a copy at www.sherregulators.com. For
further information refer to Type MR108 Instruction
Manual, Form 5875, D103247X012.
P.E.D. Category
This product may be used as a pressure 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.
PRODUCT SIZE CATEGORY
DN 25 / NPS 1 SEP
DN 50 / NPS 2 II
DN 80 / NPS 3 II
DN 100 / NPS 4 II
Specications
Available Constructions
Type MR108 with low-pressure actuator:
Direct-operated large multi-purpose backpressure
regulator with 0.34 to 2.4 bar / 5 to 35 psig
pressure range
Type MR108 with high-pressure actuator:
Direct-operated large multi-purpose backpressure
regulator with 1.7 to 20.7 bar / 25 to 300 psig
pressure range
Body Sizes and End Connection Styles
DN 25 and 50 / NPS 1 and 2:
NPT, CL125 FF, CL250 RF, CL150 RF, CL300 RF,
CL600 RF and PN 16/25/40 RF
DN 80 and 100 / NPS 3 and 4:
CL125 FF, CL250 RF, CL150 RF, CL300 RF,
CL600 RF and PN 16 RF
Backpressure Control Ranges(1)
Low-Pressure Actuator:
0.34 to 0.97 bar / 5 to 14 psig; 0.55 to 1.7 bar /
8 to 24 psig; 0.83 to 2.1 bar / 12 to 30 psig;
1.0 to 2.4 bar / 15 to 35 psig
High-Pressure Actuator:
1.7 to 2.8 bar / 25 to 40 psig; 2.4 to 4.8 bar /
35 to 70 psig; 3.8 to 8.3 bar / 55 to 120 psig;
6.2 to 13.8 bar / 90 to 200 psig(2); 12.1 to 20.7 bar /
175 to 300 psig(3)
Maximum Set Pressure(1)
Low-Pressure Actuator: 2.4 bar / 35 psig
High-Pressure Actuator:
Nitrile (NBR) and Ethylene Propylene (EPDM)
Diaphragm: 20.7 bar / 300 psig
Fluorocarbon (FKM) Diaphragm:
10.3 bar / 150 psig
Temperature Capabilities(1)
Nitrile (NBR): -29 to 82°C / -20 to 180°F
Fluorocarbon (FKM): -7 to 121°C / 20 to 250°F(4)
Ethylene Propylene (EPDM): -29 to 107°C /
-20 to 225°F(6)
Maximum Emergency Casing Pressures(1)(7)
Low-Pressure Actuator: 4.8 bar / 70 psig
High-Pressure Actuator: 27.6 bar / 400 psig(5)
Maximum Inlet Pressures(1)(7)
Low-Pressure Actuator: 4.8 bar / 70 psig
High-Pressure Actuator: 27.6 bar / 400 psig(5)
Maximum Outlet Pressures(1)(7)
Low-Pressure Actuator: 4.8 bar / 70 psig
High-Pressure Actuator: 27.6 bar / 400 psig(5)
Maximum Differential Pressures(1)
Low-Pressure Actuator: 4.8 bar / 70 psig
High-Pressure Actuator: 27.6 bar / 400 psig or
maximum inlet pressure, whichever is lower
Maximum Pressures over Set Pressure to Avoid
Internal Parts Damage(1)
Low-Pressure Actuator: 1.4 bar / 20 psig
High-Pressure Actuator: 8.3 bar / 120 psig
Installation
!
WARNING
Only qualied personnel should
install or service a backpressure
regulator. Backpressure 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 using a backpressure regulator
on a hazardous or ammable uid
service, personal injury and property
damage could occur due to re or
explosion of vented uid that may
1. The pressure/temperature limits in this Installation Guide or any applicable limitation should not be exceeded.
2. Maximum set pressure is limited to 10.3 bar / 150 psig for constructions with Fluorocarbon (FKM) diaphragm.
3. Not applicable for constructions with Fluorocarbon (FKM) diaphragm.
4. Fluorocarbon (FKM) is limited to 93°C / 200°F hot water.
5. Maximum Inlet, Outlet and Emergency Casing Pressures for constructions with Fluorocarbon (FKM) diaphragm are limited to 15.8 bar / 230 psig or the body rating limit, whichever is lower.
6. Ethylene Propylene (EPDM) is limited to -7 to 107°C / 20 to 225°F when used with Low Pressure Actuator.
7. Pressure ratings are based on a maximum operating temperature of 121°C / 250°F.

2
Type MR108
have accumulated. To prevent such
injury or damage, provide piping or
tubing to vent the uid to a safe,
well-ventilated area or containment
vessel. Also, when venting a
hazardous uid, the piping or tubing
should be located far enough away
from any buildings or windows so to
not create a further hazard and the
vent opening should be protected
against anything that could clog it.
Personal injury, equipment damage
or leakage due to escaping uid
or bursting of pressure-containing
parts may result if this backpressure
regulator is overpressured or is
installed where service conditions
could exceed the limits given in
the Specications 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 backpressure
regulator could result in personal
injury and property damage due to
escaping uid. To avoid such injury
and damage, install the backpressure
regulator in a safe location.
Clean out all pipelines before installation of the
backpressure regulator and check to be sure the
backpressure regulator has not been damaged or
has collected foreign material during shipping. For
NPT bodies, apply pipe compound to the external
pipe threads. For anged bodies, use suitable line
gaskets and approved piping and bolting practices.
Vertical installation with the actuator oriented up
or down is recommended. The unit will operate in
horizontal installation with actuator on the side,
however, this could result in premature wear of parts.
Make sure that ow will be in the same direction as
that indicated by the body arrow. Orientation of the
two vents should always be down. Vents may be
rotated after regulator installation so that the vent
screens are down.
A control line must be installed to allow inlet pressure
to register on the actuator’s diaphragm. It should
be installed four to eight pipe diameters upstream
of the regulator and in an area of pipe that is free
of turbulence.
Note
It is important that the backpressure
regulator be installed so that the vent
hole in the spring case is unobstructed
at all times. For outdoor installations,
the backpressure regulator should be
located away from vehicular trafc and
positioned so that water, ice and other
foreign materials cannot enter the
spring case through the vent. Avoid
placing the backpressure regulator
beneath eaves or downspouts and
be sure it is above the probable
snow level.
Overpressure Protection
Maximum inlet pressures depend upon body end
connections, materials and temperatures. Refer
to the nameplate for the maximum inlet pressure
of the valve. The valve should be inspected for
damage after any overpressure condition. Fisher®
backpressure regulators are NOT ASME safety
relief valves.
Startup
The backpressure regulator is factory set at
approximately the midpoint of the spring range
or the pressure requested. If a pressure setting
other than specied is desired, be sure to change
the pressure setting by following the Adjustment
section. With proper installation completed, slowly
open the upstream and downstream shutoff valves
(if applicable).
Adjustment
To change the control pressure, loosen the locknut
and turn the adjusting screw clockwise to increase
pressure or counterclockwise to decrease pressure.
Monitor the control pressure with a test gauge during
the adjustment. Tighten the locknut to maintain the
desired setting.
Taking Out of Service (Shutdown)
!
WARNING
To avoid personal injury
resulting from sudden release of
pressure, isolate the backpressure
regulator from all pressure before
attempting disassembly.

3
Type MR108
Parts List
Key Description
1 Valve Body
2 Body Flange
3 Stud Bolt
DN 25 / NPS 1 (4 required)
DN 50, 80 and 100 / NPS 2, 3 and 4 (8 required)
4 Gasket
9 Valve Spring
11 Cage
12 Port Seal
13 Seat Ring
14 Piston Ring
15 Upper Seal
16 Valve Plug
17 Cage O-ring
20 Valve Plug O-ring
21 Adaptor O-ring
24 Drive Screw (6 required)
25 Flow Arrow
26 Vent (2 required/
1 required for Pressure-Loaded Actuator)
29 Hex Nut
DN 25 / NPS 1 (4 required)
DN 50, 80 and 100 / NPS 2, 3 and 4 (8 required)
30 Pipe Plug
33 NACE Tag (not shown)
34 Seal Wire (not shown)
38 Pipe Plug
39 Pipe Plug
40 Stem Actuator
41 Flange Nut
43 Nameplate
44 Lube Fitting
45 Wiper Ring
46 Bearing (2 required)
47 Valve Stem O-ring (2 required)
48 Jam Nut (2 required)
49 Spring Washer
51 Lower Diaphragm Head O-ring
52 Lower Spring Guide
53 Lower Diaphragm Head
54 Lower Spring Seat
55 Diaphragm Plate
56 Diaphragm
57 Cap Screw
Low-Pressure Actuator (16 required)
High-Pressure Actuator (8 required)
58 Hex Nut
Low-Pressure Actuator
Steel (16 required)
Stainless steel (16 required)
High-Pressure Actuator
Steel (8 required)
Stainless steel (16 required)
60 Bonnet O-ring
61 Bonnet
62 Lower Diaphragm Casing
63 Upper Diaphragm Casing
64 Upper Casing O-ring
65 Cap Screw (10 required)
66 Spring Case Spacer
67 Cap Screw (6 required)
68 Control Spring
Figure 1. Type MR108 Assembly Drawings
GE38436
72
70
43
44 L2
74 L1
1L1
73 L3
30
26
2
38 24 25
S
S
L1
57
L1
67
2443
HIGH-PRESSURE ACTUATOR OPTION
71
56
58
57
62
51
63
64
54
53
L1
L1
L1
L1
S
67
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L1
L3
S
S
S
S
12
29
39
84
74
65
53
57
55
26
76
68
71
69
52
64
66
65
63
62
56
58
51
61
21
40
11
4
3
9
13
16
17
SEE DETAIL X
SEE DETAIL Z
SEE DETAIL W
SEE DETAIL Y
SEE DETAIL V
APPLY LUBRICANT OR SEALANT(1):
L1 = MULTI-PURPOSE POLYTETRAFLUOROETHYLENE (PTFE) LUBRICANT
L3 = ANTI-SEIZE COMPOUND
S = MULTI-PURPOSE PTFE THREAD SEALANT
1. Lubricants and sealants must be selected such that they meet the
temperature requirements.
Note: Keys 64 and 71 are used only for pressure-loaded actuators.

Type MR108
©Emerson Process Management Regulator Technologies, Inc., 2010, 2015; All Rights Reserved
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 speci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.
Industrial Regulators
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Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]
Asia-Pacic
Shanghai 201206, China
Tel: [phone]
Europe
Bologna 40013, Italy
Tel: [phone]
Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]
Natural Gas Technologies
Emerson Process Management
Regulator Technologies, Inc.
USA - Headquarters
McKinney, Texas 75070 USA
Tel: [phone]
Outside U.S. [phone]
Asia-Pacic
Singapore 128461, Singapore
Tel: [phone]
Europe
Bologna 40013, Italy
Tel: [phone]
Chartres 28008, France
Tel: [phone]
Middle East and Africa
Dubai, United Arab Emirates
Tel: [phone]
TESCOM
Emerson Process Management
Tescom Corporation
USA - Headquarters
Elk River, Minnesota 55330-2445, USA
Tel: [phone]
[phone]
Europe
Selmsdorf 23923, Germany
Tel: [phone]
Asia-Pacic
Shanghai 201206, China
Tel: [phone]
For further information visit www.fisherregulators.com
Figure 1. Type MR108 Assembly Drawings (continued)
Parts List (continued)
Key Description
69 Upper Spring Seat
70 Spring Case
71 Sealing Washer (not shown)
72 Jam Nut
73 Square Head Adjusting Screw
74 Adaptor
76 Pipe Bushing
81 Pipe Nipple (not shown)
82 Drain Valve (not shown)
84 Internal Stiffener Plate
85 Bleed Valve (not shown)
87 Upper Casing Welding Assembly (not shown)
48
49
41
46
60
47
15
14
2
16
20
L1
L1 45
46
47
L1
L1
L1
DETAIL W
48
49
41
46
60
47
15
14
2
16
20
L1
L1
45
46
47
L1
L1
L1
DETAIL Y
48
49
41
46
60
47
15
14
2
16
20
L1
L1
45
46
47
L1
L1
L1
DETAIL Z
48
49
41
46
60
47
15
14
2
16
20
L1
L1 45
46
47
L1
L1
L1
DETAIL V
48
49
41
46
60
47
15
14
2
16
20
L1
L1 45
46
47
L1
L1
L1
DETAIL X
GE38436
72
70
43
44 L2
74 L1
1L1
73 L3
30
26
2
38 24 25
S
S
L1
57
L1
67
2443
HIGH-PRESSURE ACTUATOR OPTION
71
56
58
57
62
51
63
64
54
53
L1
L1
L1
L1
S
67
L1
APPLY LUBRICANT OR SEALANT(1):
L1 = MULTI-PURPOSE PTFE LUBRICANT
1. Lubricants and sealants must be selected such that they meet the temperature requirements.