Safety Valve

Safety valve manufacturers in USA 

SVR Global designs, manufactures, and tests safety valves for boilers, pressure vessels, and process systems that require overpressure protection. Our facilities operate in United States, and our valves are engineered, assembled, and tested to meet ASME and National Board requirements, giving customers documented traceability from design through final certification.

What Is a Safety Valve?

Safety valves are devices which automatically vent fluid from a system whenever there is excessive pressure in the system to prevent any possible failure due to overpressure in the boiler, pressure vessel, or pipe lines. The safety valve will close after the pressure in the system becomes safe again.

Types of Safety Valves We Manufacture:

• Bellow Safety Valve

• Conventional Safety Valve

• Pilot Operated Safety Valve

• Pressure Safety Valve

• Steam Safety Valve

• Thermal Safety Valve

Safety Valve Design and Components:

1)Nozzle and Disc

The nozzle forms the flow path through the valve body, and the disc seats against the nozzle to seal the valve closed until lifted by system pressure.

2)Spring and Spindle

The spring provides the force holding the disc closed, while the spindle transmits that force and guides disc movement during lift and reseating.

3)Bellows (Balanced Designs)

Isolates the spring chamber from backpressure and process fluid, protecting the spring from corrosion and maintaining consistent set pressure regardless of downstream conditions.

4)Lifting Lever and Cap Options

A lifting lever allows manual testing of valve operation, while cap options (screwed or bolted) control access to the spring adjustment mechanism for tamper resistance or field adjustment.

5)Set Pressure, Blowdown, and Accumulation Explained

• Set pressure - the pressure at which the valve begins to open

• Blowdown - the difference between set pressure and the pressure at which the valve recloses

• Accumulation - the pressure increase above set pressure that occurs while the valve is relieving, expressed as a percentage of set pressure per the applicable code

Applications by System Type:

1)Boiler and Steam System Safety Valve

Protect boiler drums, superheaters, and steam lines from overpressure, typically built to ASME Section I requirements.

2)Pressure Vessel Safety Valve

Protect process vessels, storage tanks, and reactors from exceeding design pressure, typically built to ASME Section VIII requirements.

3)Compressed Air and Gas System Relief Valve

Protect compressors, receivers, and pneumatic distribution systems from pressure buildup caused by control malfunctions or downstream blockages.

4)Cryogenic and LNG Service Valve

Protect storage and transfer systems for liquefied gases, where material selection must account for extreme low-temperature embrittlement.

5)Hydraulic and Thermal Expansion Relief

Protect hydraulic systems and liquid-filled piping segments from pressure spikes caused by thermal expansion or system malfunction.

Safety Valve Codes, Standards, and Certifications:

ASME Section I Certification (Boilers)

• ASME Section VIII Certification (Pressure Vessels)

• National Board "VR" Repair Stamp

• National Board "UV" and "UV3" Stamps

• API 526, API 520, and API 527 Standards

• Capacity Certification and Third Party Testing

Our Engineering and Testing Capabilities:

Safety valves are life safety equipment, and the manufacturer's testing and certification record matters as much as the design itself. At SVR Global, engineering, assembly, and testing take place under a documented quality system, with set pressure and capacity verified before a valve ships. 

• In-House Testing Facility

• Set Pressure Verification and Capacity Testing

• Experienced engineering team

• Operation and Manufacturing Track Record

Industries That Rely on Our Safety Valve:

• Power Generation and Boiler Systems

Used to protect boiler drums, steam headers, and turbine systems from overpressure conditions.

• Oil and Gas Processing

Used across upstream, midstream, and downstream operations to protect vessels, separators, and pipelines from overpressure.

• Chemical and Petrochemical Plants

Used to protect reactors, storage tanks, and process piping handling hazardous or corrosive fluids.

• Compressed Gas and Industrial Air Systems

Used to protect compressors, receivers, and distribution piping from pressure buildup.

• Marine and Defense Applications

Used in shipboard and military systems requiring documented compliance with mission-specific pressure protection standards.

Safety Valve Testing, Inspection, and Repair:

1)Jurisdictional Inspection Requirements

• Many states require periodic inspection by an authorized inspector

• Intervals are set by jurisdiction, not a single national standard

2)Recommended Testing Intervals

• Annual testing is common for boiler and process safety valves

• More frequent testing needed for valves in fouling or corrosive service

3)In-Plant vs Bench Testing

• In-plant testing checks performance without removing the valve

• Bench testing removes the valve for controlled testing on a dedicated stand, giving more precise set pressure verification