Anderson Greenwood Series MLCPPilot Operated Pressure Relief Valves

The Anderson Greenwood Series MLC Pilot Operated Pressure Relief Valves (PRVs), designed by Emerson, provide precise overpressure protection, tight sealing, and reliable performance for liquid, gas, and steam applications across multiple process industries. Built for critical service conditions, the Series MLC valve combines advanced pilot-operated technology with robust construction, offering superior sealing performance and stable operation even under fluctuating pressure conditions.

The MLC series uses a modulating pilot design that allows the main valve to open proportionally to the system overpressure, delivering smooth, controlled pressure relief. This results in reduced product loss, lower noise levels, and minimal system pressure fluctuations compared to conventional spring-loaded safety valves. The soft seat options provide bubble-tight sealing, extending valve life and reducing emissions.

With a compact, service-friendly design, the Anderson Greenwood MLC valve is ideal for refineries, petrochemical facilities, power generation plants, and other process industries requiring high accuracy, repeatability, and reliability in pressure protection systems.

Feature of Anderson Greenwood Series MLCPPilot Operated Pressure Relief Valves

• Rigid integral pilot mounting eliminates the need for mounting brackets and lowers the center of gravity.
• FKM soft seats and seals reduce emissions and product loss while minimizing maintenance costs.
• Simple design helps reduce maintenance time.
• Full bore orifices provide for maximum capacity, reducing valve and associated piping.
• Internal sensing helps reduce maintenance time, provides for a more compact design and eliminates tubing and fittings.
• Modulating action helps reduce product loss and maintains pressure stability in the system.
• Full rated capacity at 10% overpressure allows for increased set pressures and/or a smaller valve in a given application.
• Manual blowdown via field test connection.
• Normally-closed solenoid valve at field test connection for remote valve opening (optional).

Technical Specification of Anderson Greenwood Series MLCPPilot Operated Pressure Relief Valves

• Valve Type: Pilot Operated Pressure Relief Valve (Modulating)

• Series: MLC

• Set Pressure Range: 15 psig to 6,000 psig (1 to 414 bar)

• Temperature Range: -196°C to +427°C (-320°F to +800°F), depending on material and seat type

• Body Materials: Carbon steel, stainless steel, Monel®, Inconel®, or special alloys

• Seat Options: Metal or soft (PTFE, PEEK, or elastomer)

• Connections: Flanged, threaded, or welded (ASME, ANSI, or DIN standards)

• Flow Medium: Gas, vapor, liquid, or steam

• Orifice Sizes: API standard designations (D–T)

• Certifications: ASME Section VIII, PED, ISO 4126, and API 520/526 compliant