Pressure Safety Valve Manufacturers in India
Speciality Valve is a leading Pressure Safety Valve Manufacturers and Supplier in India, delivering high-performance solutions for critical applications across oil & gas, power, petrochemical, marine, LNG, and industrial sectors. Our safety valves are designed to automatically release excess pressure, protecting equipment, pipelines, and plants from overpressure conditions. Built in compliance with API 526, API 520, ASME Sec. VIII, ISO 4126, and DIN standards, our valves ensure safety, reliability, and long service life.
Function & Working
Pressure safety valves (PSVs) are spring-loaded or pilot-operated devices designed to open at a preset pressure, venting excess fluid until system pressure returns to safe levels. Once normal pressure is restored, the valve reseats automatically, ensuring continuous protection without operator intervention.
Advantages of Speciality Valve Pressure Safety Valves
Manufactured in all pressure classes from ASME 150 to 4500 and PN 10 – PN 420
Available in spring loaded, pilot operated, balanced bellows, and thermal relief designs
Built to handle liquids, gases, steam, cryogenic, and high-temperature services
Full compliance with API, ASME, ISO, DIN, and PED standards
Options for flanged, threaded, butt weld, and socket weld connections
Long service life with stellite-hardfaced trim and corrosion-resistant alloys
Types Offered
Conventional Spring Loaded Safety Valve – widely used for liquid, gas, and steam applications
Balanced Bellows Safety Valve – eliminates backpressure effects, ideal for offshore and chemical plants
Pilot Operated Safety Valve (POSV) – precise set pressure, suitable for high-pressure and large capacity applications
Thermal Safety Valve – protects pipelines, pumps, and vessels from thermal expansion
Cryogenic Safety Valve – extended bonnet design for –196 °C LNG and cryogenic systems
Industries Served
Oil & Gas Production and Refineries
LNG and Cryogenic Terminals
Power Generation (Thermal, Nuclear, Renewable)
Marine and Offshore Platforms
Petrochemical and Chemical Processing
Water Treatment and Desalination Plants
Pulp & Paper, Fertilizer, Steel, and Cement Industries
Technical Specifications
| Specification | Details |
|---|---|
| Design Standards | API 526, API 520, ASME Sec. VIII Div. 1 & 2, ISO 4126, DIN EN 4126 |
| Pressure Class | ASME 150 – 4500, PN 10 – PN 420 |
| Size Range | DN 15 – DN 600 (½” – 24”) |
| Orifice Area | As per API 526 designation (D – T) |
| Body Materials | WCB, WCC, LCB, LCC, CF8, CF8M, CF3M, F304, F316, F321, F347, F51, F53, F55, Alloy 20, Monel, Inconel, Hastelloy, Titanium, Zirconium, Aluminium Bronze |
| End Connections | Flanged (RF, RTJ), Butt Weld (BW), Socket Weld (SW), Threaded (NPT, BSP) |
| Seat Options | Metal-to-metal, soft-seated, stellited trims |
| Temperature Range | –196 °C to +600 °C |
Standards & Testing
Every pressure safety valve is tested and certified to ensure long-term reliability and safety:
Hydrostatic Testing: Body tested at 1.5 × design pressure
Set Pressure Testing: Adjusted and calibrated for precise opening at required set point
Seat Leakage Testing: As per API 527
Cryogenic Testing: Valves tested down to –196 °C for LNG service
NDE Options: RT, UT, MPI, and LPT as per project requirements
Documentation: Complete MTCs (EN 10204 3.1/3.2), ITPs, QAPs, and calibration certificates supplied
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