Anderson Greenwood Safety Selector Valve
The Anderson Greenwood Safety Selector Valve by Emerson is a precision-engineered isolation device that allows continuous overpressure protection when servicing dual relief valves. Built to ASME and API standards, it ensures fail-safe operation, bubble-tight sealing, and compliance in critical process systems.
The Anderson Greenwood Safety Selector Valve, engineered by Emerson, is a high-integrity isolation and selection device designed to ensure continuous system protection when using dual pressure relief valves. This valve enables operators to safely isolate one safety relief valve for maintenance or inspection while keeping the other valve fully operational, ensuring uninterrupted overpressure protection in critical process systems. Built to ASME and API standards, the Safety Selector Valve provides a fail-safe, positive sealing mechanism that prevents accidental isolation of both relief valves simultaneously — a vital feature for safety compliance in refineries, power generation, petrochemical, and process industries. Its compact design, low torque operation, and bubble-tight sealing deliver unmatched performance and reliability under high-pressure and high-temperature conditions. With precision-engineered internal passages and optimized flow characteristics, the Anderson Greenwood Safety Selector Valve minimizes pressure drop and ensures accurate relief valve performance. Available in manual or remotely operated designs, it integrates easily with Anderson Greenwood’s pressure relief and safety valve systems for comprehensive overpressure protection.
Technical Specification of Anderson Greenwood Safety Selector Valve
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Type: Safety Selector Valve (2-way or 3-way design)
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Size Range: 1/2” to 4” (DN15 – DN100)
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Pressure Class: ASME Class 150 to 2500
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Body Materials: Stainless Steel, Carbon Steel, or Nickel Alloys
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Temperature Range: -46°C to +400°C (-50°F to +752°F)
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Connections: Flanged, Threaded, or Butt-Weld per ASME standards
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Sealing: Metal-to-metal or soft-seat options
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Operation: Manual handwheel or automated (pneumatic/hydraulic actuator)
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Compliance: ASME Section VIII, API 520/526, PED, and ISO 4126
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Leakage Class: ANSI/FCI 70-2 Class VI (soft seat)
Feature of Anderson Greenwood Safety Selector Valve
- Provides high Cv values, resulting in less than 3% pressure drop to the active PRV inlet, reducing destructive valve chatter.
- One minimally sized penetration into the vessel or pipe reduces costs.
- Reduces field installation costs and space requirements through preassembled and compact design.
- Provides process isolation of standby PRV.
- Allows PRV maintenance without process shutdown.
- Bleed valve under each PRV vents entrapped process effectively and safely prior to removal for maintenance.
- Clear, positive indication of active PRV.
- Foolproof provisions for dual padlocking in either PRV position.
- Tested packing design and minimal leak points reduce fugitive emissions.
- No seat lapping required for maintenance. Minimal spare parts reduce cost of ownership.
- Simple operation with built-in seat equalization and no special tools minimizes total valve operating time.
- Tandem system available for dual PRV’s discharging to a closed header system.