Pressure Relief Valve, Spring-Loaded, 2 in × 150# RF, 285 psi, Standard Service

The Pressure Relief Valve, Spring-Loaded, 2 in × 150# RF, 285 psi, Standard Service is a spring-loaded conventional pressure relief valve rated for 285 psi working pressure (ANSI 150 class), 2 in 150# ANSI Raised-Face Flange. Standard service rated.

Spring-loaded conventional relief design — line pressure acts directly on the disc; the spring sets the opening (set) pressure. When line pressure exceeds set, the disc lifts off the seat and discharges to atmosphere or to the relief header until line pressure drops below the reseat (blowdown) pressure. Simple, robust, and field-serviceable.

Set pressure is made-to-order. Specify the required set pressure on the RFQ — typical setpoints range from 50% to 100% of the body pressure rating. Indus calibrates and seals the valve at the spec'd setpoint with a witness-test certificate.

Construction

• Type: Pressure Relief — Spring-Loaded
• Nominal size: 2 in
• Body material: Cast WCB carbon steel
• Trim (disc + seat + nozzle): 316SS disc + nozzle, hardness-controlled spring
• Seal / soft goods: RPTFE back-up + Viton (FKM) primary seals
• Inlet: 2 in 150# ANSI Raised-Face Flange
• Outlet: 3 in 150# ANSI Raised-Face Flange

Performance

Working pressure 285 psi. Set pressure factory-calibrated and witness-tested per ASME B16.34. Standard service rated.

Applications

• Utility-system over-pressure
• Fire-water pump discharge relief
• Low-pressure process protection
• Tank-farm over-pressure venting

Compliance

• API 526 (steel pressure relief valves) and / or ASME Section VIII Division 1
• Calibration and witness-test certificate at specified set pressure
• Mill test reports per EN 10204 3.1 / 3.2

How to order

Confirm (a) line operating pressure (typically 90% of set pressure), (b) required set pressure (the over-pressure protection threshold), (c) line fluid and temperature (affects orifice sizing per API 520), (d) discharge routing (atmosphere / relief header / closed flare), (e) service class (standard vs sour), (f) any required certifications (ASME UV stamp, API monogram, witness-test attendance). Indus quotes ex-works OEM with calibration and pre-shipment test certificates.

Companion products

Pair with a matched-rated isolation valve upstream (typically a manual gate or ball valve, locked-open) and a manual block valve on the discharge line for service / maintenance access. For relief headers handling H₂S, ensure the discharge piping is also NACE MR0175 compliant. Indus also supplies relief-system engineering services (orifice sizing per API 520, blowdown / over-pressure analysis) on request.