Pressure Safety Valve Manufacturer in India

Speciality Valve is a leading Pressure Safety Valve Manufacturer and Supplier in India, delivering high-performance valves for critical applications in oil & gas, power, petrochemical, marine, LNG, and industrial plants. Our safety valves automatically relieve excess pressure to protect pipelines, vessels, and equipment. Designed and manufactured in compliance with API 526, API 520, ASME Sec. VIII, ISO 4126, and DIN EN 4126, these valves ensure safety, accuracy, and long service life.

Function & Working

Pressure safety valves (PSVs) operate on a spring-loaded or pilot-operated mechanism. When system pressure exceeds the set value, the valve opens automatically to vent fluid or gas until normal conditions are restored, after which it reseats to maintain tight shut-off. This self-actuating design ensures continuous protection without external power or manual intervention.

Advantages

Manufactured in ASME Class 150 to 4500 and PN 10 to PN 420 • Available in spring-loaded, pilot-operated, balanced-bellows, and thermal relief designs • Suitable for liquid, gas, steam, cryogenic, and high-temperature applications • Fully compliant with international standards • Offered with flanged, butt-weld, socket-weld, and threaded ends • Long service life with Stellite-hardfaced trims and corrosion-resistant alloys

Types Offered

Conventional Spring-Loaded Safety Valve – for steam, gas, and liquid service • Balanced Bellows Safety Valve – compensates for backpressure in chemical and offshore use • Pilot-Operated Safety Valve – precision control for high-pressure or large-capacity systems • Thermal Safety Valve – protects closed systems from thermal expansion • Cryogenic Safety Valve – extended bonnet design for –196 °C LNG and cryogenic duties

Industries Served

Oil & Gas Production and Refining • LNG and Cryogenic Terminals • Power Generation (Thermal, Nuclear, Renewable) • Marine and Offshore Platforms • Petrochemical and Fertilizer Plants • Water Treatment and Desalination • Steel, Pulp & Paper, and Cement Industries

Technical Specifications

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: DN15 – DN600 (½″ – 24″)
Orifice Area: As per API 526 Designation D–T
Temperature Range: –196 °C to +600 °C
End Connections: Flanged (RF/RTJ), Butt Weld (BW), Socket Weld (SW), Threaded (NPT/BSP)
Seat Options: Metal-to-Metal, Soft-Seated, Stellite Trim

Material of Construction

Body and Bonnet: Carbon Steel (WCB, WCC, LCB, LCC), Stainless Steel (CF8, CF8M, CF3M, F304, F316, F321, F347), Duplex and Super Duplex (F51, F53, F55), Nickel Alloys (Alloy 20, Monel, Inconel, Hastelloy), Titanium, Zirconium, Aluminium Bronze (C95800)
Trim: Stellite 6, 316 SS, Monel, or Tungsten Carbide Hardfacing
Spring: Chrome-Vanadium or Inconel X-750
Gaskets and Packing: Graphite or PTFE for fire-safe sealing

Testing & Certification

Each valve is hydrostatically tested at 1.5 times design pressure. Set pressure is calibrated for precise lift and reseating. Seat leakage testing is performed per API 527. Cryogenic testing down to –196 °C is carried out for LNG service when required. Non-destructive examinations such as RT, UT, MPI, and LPT are performed as per project specifications. All valves are supplied with EN 10204 3.1 or 3.2 material test certificates, QAP, ITP, and calibration documentation.

Why Choose Speciality Valve

As a trusted Pressure Safety Valve Manufacturer in India, Speciality Valve ensures that each PSV meets stringent safety, performance, and reliability standards. With precision engineering, robust materials, and thorough quality inspection, our valves deliver consistent pressure protection and long service life across demanding process environments