Safety Valves

Pilot Operated Safety Relief Valve

Pilot-operated safety relief valve for high-pressure gas and liquid service requiring tight seat sealing at pressures close to set point. A small pilot valve controls the main valve piston, providing modulating action, reduced operating losses, and high blowdown accuracy. Suitable for natural gas, LPG, steam, and critical process fluids where conventional spring-loaded valves cannot maintain seat tightness near set pressure.

Key Applications

Natural Gas CompressionLPG Storage and TransferHigh Pressure Steam SystemsRefinery Process OverpressureChemical Plant Relief
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Technical Specifications

Valve Type Pilot-operated safety relief valve
Design Standard API 526 / API 520
Size Range 25 mm to 300 mm
Pressure Rating Class 150 to Class 2500
Set Pressure Accuracy ±1% of set pressure
Seat Tightness Bubble-tight to 95% of set pressure
End Connection Flanged RF/RTJ
Manufacturer Supreme Valves India

Material of Construction (MOC)

Component / Part Available Materials
Body ASTM A216 WCB / A351 CF8M / A217 WC6
Main Valve Piston / Seat SS 316 with Stellite trim optional
Pilot Valve SS 316 internals
Diaphragm / Seals PTFE / Viton per service

Purchase Options

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Features & Benefits

Near-Set-Point Sealing

Pilot-operated design maintains bubble-tight shutoff up to 95% of set pressure, reducing media loss.

Modulating Relief

Proportional opening reduces hammer and reclosure shock on high-capacity gas service.

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  • Valve type: Pilot-operated safety relief valve
  • Size: 25 mm to 300 mm
  • Pressure class: Class 150 to Class 2500

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