Fisher Type MR105 | High-Capacity Direct-Operated Multi-Purpose Regulator

Key Benefits and Advantages

• High-Capacity Liquid Control: Specifically optimized for high-volume liquid service, the MR105 manages large flow rates with a low pressure drop, ensuring system efficiency in cooling and lubrication circuits.

• Fast Speed of Response: Because the sensing diaphragm is directly linked to the valve plug, the MR105 reacts immediately to changes in downstream demand, preventing pressure spikes in sensitive equipment.

• Dirty Service Reliability: The robust internal design is less susceptible to clogging or sticking than pilot-operated alternatives, allowing it to perform reliably in “dirty” service where particulates may be present in the fluid.

• API 614 Compliance: Available in Steel and Stainless Steel constructions that meet the stringent requirements of API 614 for lubrication, shaft-sealing, and control-oil systems.

• NACE Sour Gas Readiness: Optional constructions are available to meet NACE MR0175 and MR0103 standards, providing essential safety and durability in sour gas environments or corrosive chemical processes.

• Operational Versatility:

  1. Pressure-Loaded Actuator: Allows for remote setpoint adjustment or differential pressure control by loading the actuator with an external gas source.

  2. P1 = P2 Capability: On high-pressure actuator versions, the design allows the inlet pressure to equal the outlet pressure rating, providing a higher safety margin for the casing.

• Integrated Maintenance Tools: Features like the standard drain valve and optional bleed valve (for high-pressure units) simplify the depressurization and cleaning process during routine maintenance.

• Visual Travel Indicator: A standard travel indicator allows operators to monitor the valve plug position in real-time, facilitating easier troubleshooting and performance verification.

Technical Properties

• Operation: Direct-operated (Spring-loaded or Pressure-loaded).

• Media Compatibility: Liquids (Lube oil, Water), Air, and Gases.

• Body Materials: WCC Steel, CF8M Stainless Steel, and other alloys.

• Maximum Pressure: Available with high-pressure actuators for demanding industrial headers.

• Temperature Range: Broad temperature capabilities depending on elastomer selection.

• Shutoff Class: Designed for tight shutoff to prevent downstream pressure buildup.

Field of Application

The MR105 is a “multi-purpose” workhorse, frequently found in heavy industrial machinery and fluid distribution systems where reliability is paramount.

Primary Industries and Uses:

• Lubrication Systems: Serving as the primary pressure regulator for API 614 lube oil consoles on turbines and compressors.

• Pump Bypass: Functioning as a high-speed bypass regulator to protect pumps from dead-heading and to maintain system pressure.

• Cooling Water Management: Regulating the flow of cooling water to heat exchangers and industrial machinery.

• Fuel Gas Regulation: Reliable pressure reduction for high-volume fuel gas headers in power plants and refineries.