Type MR105
2
The Specications section on this page provides the ratings and other specications for the Type MR105. 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
Class VI (Soft Seat)
Maximum Inlet, Outlet and Emergency
Casing Pressures
(1)
See Table 3
Outlet Pressure Ranges
(1)
5 to 300 psig / 0.34 to 20.7 bar; see Table 2
Maximum Setpoint
(1)
Low-Pressure Actuator: 43 psig / 3.0 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 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
Maximum Differential Pressures
(1)
See Table 4
Temperature Capabilities
(1)
Nitrile (NBR): -20 to 180°F / -29 to 82°C
Fluorocarbon (FKM)
: 20 to 250°F / -7 to 121°C
Ethylene Propylene (EPDM)
: -20 to 225°F /
-29 to 107°C
See Table 5
Pressure Registration
External
Downstream Control Line Connection Size
1/2 NPT
Spring Case Vent
Type Y602-12
Pressure-Loaded Spring Case Vent
1/2 NPT
Approximate Weights
For Type MR105 with Low-Pressure Actuator
NPS 1 / DN 25 : 86 lbs / 39 kg
NPS 2 / DN 50: 116 lbs / 53 kg
NPS 3 / DN 80: 165 lbs / 75 kg
NPS 4 / DN 100: 174 lbs / 79 kg
For Type MR105 with High-Pressure Actuator
NPS 1 / DN 25: 76 lbs / 34 kg
NPS 2 / DN 50: 105 lbs / 48 kg
NPS 3 / DN 80: 155 lbs / 70 kg
NPS 4 / DN 100: 164 lbs / 74 kg
Options
• Visual Travel Indicator
• Drain Valve
• Pressure-Loaded Actuator
• NACE Construction
• Bleed Valve (for High-Pressure Actuator Only)
• Ethylene Propylene (EPDM) Elastomer
Trim Parts
1. The pressure/temperature limits in this Instruction Manual and any applicable standard or code 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 250°F / -7 to 121°C when used with Low Pressure Actuator.
Introduction
Scope of the Manual
This instruction manual provides installation,
adjustment, maintenance and parts ordering
information for Type MR105 direct-operated
pressure reducing regulators.
Description
The Type MR105 direct-operated pressure reducing
regulators are high capacity multi-purpose regulators.
They are designed to handle pressures up to 400 psig /
!
WARNING
To avoid possible personal injury,
equipment damage or leakage due to
an external load to the actuator or any
part of the regulator while working
around the regulator.
Note
To avoid cavitation, it is recommended that
the customer follow the capacity sizing
(20 pages)
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