Key Benefits and Advantages
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High-Capacity Multi-Purpose Performance: The MR108 is built to manage high flow rates while maintaining precise pressure control. It is equally effective in liquid lubrication circuits as it is in high-volume gas headers.
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Critical Speed of Response: Because the sensing element acts directly on the valve plug without the delay of a pilot system, the MR108 reacts immediately to upstream pressure changes. This is vital for protecting pumps from dead-heading or managing surges in process lines.
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Reliable in Dirty Service: The robust internal architecture is designed to function even when the process fluid contains impurities. This makes it more reliable than pilot-operated valves in applications like wellhead gas or recycled cooling water.
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API 614 Compliance: Steel and Stainless Steel constructions are available that specifically meet API 614 requirements. This makes the MR108 a standard component for lubrication, shaft-sealing, and control-oil systems in the oil and power industries.
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Sour Gas Capability: To ensure safety in hazardous environments, the MR108 can be specified in constructions that meet NACE MR0175 and MR0103 standards for H2S service.
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Pressure-Loaded Actuator: For applications requiring remote setpoint adjustment or differential pressure control, the actuator can be pressure-loaded with an external gas source rather than relying solely on spring tension.
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High Pressure and Temperature Ratings: Capable of managing pressures up to 400 psig (27.6 bar) and temperatures up to 250°F (121°C), the MR108 is suitable for demanding industrial utility headers.
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Maintenance Features: Standard units include a drain valve for easy cleaning and a visual travel indicator for in-service performance monitoring. High-pressure versions also include a bleed valve for safe depressurization.
Technical Properties
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Operation: Direct-operated (Spring-loaded or Pressure-loaded).
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Service: Backpressure or Relief.
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Maximum Inlet Pressure: 400 psig / 27.6 bar.
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Maximum Temperature: 250°F / 121°C.
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Body Materials: WCC Steel, CF8M Stainless Steel, and other alloy options.
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P1 = P2 Capability: On high-pressure actuator models, the design allows the inlet pressure to equal the outlet pressure rating for maximum safety.
Field of Application
The MR108 is an industrial workhorse found wherever upstream pressure stability is non-negotiable, particularly in high-speed rotating equipment.
Primary Industries and Uses:
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Lube Oil Systems: Maintaining constant oil header pressure for large turbines, compressors, and pumps in refineries and power plants.
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Pump Bypass: Releasing excess flow to the suction side of a pump to prevent over-pressurization during low-demand periods.
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Gas Gathering: Managing backpressure on separators and wellhead equipment in upstream oil and gas production.
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Industrial Cooling Loops: Controlling the pressure of cooling water or heat transfer fluids across industrial heat exchangers.
