Safety Valves

Spring Loaded Safety Relief Valve — Angle Discharge Full Lift

Conventional spring-loaded safety relief valve with angle discharge, full lift, semi-nozzle or full-nozzle design, open bonnet, and plain lifting lever. Top-guided unobstructed seat bore for high discharge capacity on steam, hot water, and liquid overpressure protection. Sized per API 520; manufactured and tested to API 526 and API 527. IBR certification available for boiler and autoclave duty in India.

Key Applications

Steam Boiler Overpressure ProtectionHot Water Boiler ReliefAutoclave SafetyProcess Steam PipelinesLiquid Hydrocarbon Relief
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Technical Specifications

Valve Type Angle discharge, spring loaded, full lift, conventional type
Design Standard API 526
Sizing Standard API 520 Part I / Part II
Testing Standard API 527 seat tightness
Size Range 25 x 50 mm to 250 x 350 mm (inlet x outlet)
Pressure Rating Class 150 to Class 2500; BS 10 Table H and E
End Connection Flanged RF/FF/RTJ or butt weld
Set Pressure Accuracy Per ASME Section VIII Div. 1 / IBR 1950
Orifice Diameter 9.5 mm to 190 mm seat bore
Accessories Balance bellows, packed lever, test gag, lead seal (optional)
Manufacturer Supreme Valves India

Material of Construction (MOC)

Component / Part Available Materials
Body ASTM A216 WCB / A217 WC6/WC9 / A351 CF8/CF8M
Bonnet / Cap / Lever WCB, SG iron, or stainless steel
Nozzle / Guide / Disc Holder ASTM A351 CF8 / CF8M
Disc SS 304 / SS 316
Stem / Adjusting Screw SS 410
Setting Spring Carbon steel / alloy steel / SS 302 / Inconel
Studs / Nuts ASTM A193 B7 / A194 2H
Gasket Aramid fibre, non-asbestos

Dimensions & Weights

Inlet x Outlet (mm)A (mm)B (mm)C (mm)
25 x 50105115456
50 x 80133124575
80 x 100155162674
100 x 150181229940
150 x 2002402411090

Service Media

Saturated SteamHot WaterLiquid

Purchase Options

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Features & Benefits

Full Lift High Capacity

Single-spring full-lift design delivers maximum rated discharge capacity with top-guided unobstructed seat bore.

Precision Metal Seat

Mirror-polished metal-to-metal seat with precision-lapped disc and nozzle for repeatable set and reset pressure.

API 526 Conventional Design

Open bonnet with plain lifting lever; optional balance bellows for variable back pressure service.

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  • Valve type: Angle discharge, spring loaded, full lift, conventional type
  • Size: 25 x 50 mm to 250 x 350 mm (inlet x outlet)
  • Pressure class: Class 150 to Class 2500; BS 10 Table H and E

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