Safety Valve Manufacturer in India
Designed for overpressure protection, a safety valve automatically opens when system pressure reaches its predetermined set point and releases excess pressure to protect pressure-containing equipment. After the pressure falls below the required reseating level, the valve closes to restore system integrity. Speciality Valve offers safety valve solutions for steam, gas, liquid and industrial process services. Choosing a Safety Valve Manufacturer in India requires evaluation of operating pressure, set pressure, temperature, discharge capacity, fluid properties and applicable standards.
What Is a Safety Valve and How Does It Work?
Safety valve is an automatic device used for release of excess pressure through an automatic process. A spring-loaded device holds the disc in contact with the nozzle. In case of pressure being higher than set pressure, the disc will lift, allowing the fluid to be released.
This device works in reverse manner compared to regulating valves that work in open position up to the set pressure.
Safety Valve Types and Their Uses:
Bellow Safety Valve: Makes use of metallic bellows to eliminate the effect of variable back pressure and separates the spring chamber from the process fluid.
Conventional Safety Valve: Directly operates through spring loading where back pressure is within design limits.
Pilot Operated Safety Valve: Employs pilot for control of the main valve with high relief capacity close to operating pressure.
Pressure Safety Valve: Guards gas, vapor, air, and suitable liquid systems.
Steam Safety Valve: Ensures quick opening of boiler, steam drum, header, and steam line applications.
Thermal Safety Valve: Offers venting of trapped liquid due to thermal expansion
Safety Valve Technical Specifications:
Parameter | Available configuration |
Size range | ½ inch to 24 inches |
Pressure rating | Class 150–2500; PN10–PN420 |
End connections | Flanged, threaded, or butt-weld |
Body materials | WCB, LCB, CF8, CF8M, alloy steel, duplex, and approved alloys |
Design options | Conventional, bellows, pilot-operated, steam, pressure, and thermal designs |
Required data | Medium, set pressure, relieving capacity, temperature, and back pressure |
Available sizes, materials, ratings, and connections vary by valve type and project specification.
Safety Valve Set Pressure, Blowdown and Back Pressure:
Correct selection requires understanding these operating terms:
Set pressure: Inlet pressure at which opening action begins.
Accumulation: Pressure increases above maximum allowable working pressure during relief.
Overpressure: Pressure above set pressure required to achieve rated capacity.
Blowdown: Difference between set and reseating pressure, expressed as a percentage.
Back pressure: Pressure present at the valve outlet.
Relieving capacity: Flow the valve must discharge during the defined emergency.
These values influence spring selection, orifice area, stability, and discharge-system design.
Safety Valve Sizing and Selection:
A reliable safety valve is determined using an overpressure situation. These may come from an obstructed outlet, fire on the exterior, faulty control valves, ruptured exchanger tubes, utility failures, or thermal expansion.
Some of the information that is required in order to size a safety valve are the physical properties of the fluids, relieving temperature, operating pressure, allowable overpressure, capacity for discharging, inlet pressure drop, static back pressure, superimposed back pressure, and where to discharge.
Applicable Standards for Safety Valve:
Applicable requirements may be ASME BPVC Sec. XIII on overpressure protection, API 520 for sizing and location, API 521 for design of relief systems, API 526 for flanged steel valve dimensions, and API 527 for seat tightness tests. IBR requirements will apply to boilers and steam applications if specified.
Inspection may involve testing of the shell, seat leakage testing, setting pressure verification, blowdown testing, lift verification, and functionality testing.
Safety Valve Uses:
Oil and gas production and processing
Refineries and petrochemical complexes
Thermal power stations and boiler systems
Chemical and fertilizer plants
Steel, cement, and mining operations
Compressed-air and industrial gas systems
Pressure vessels, storage systems, and process pipelines
Speciality Valve helps domestic export projects with material selection, orifice review, set-pressure verification, testing, drawings, and traceability records. Share the medium, the pressure-relieving situation, the set pressure, the temperature, the needed capacity, the back pressure, the connection, and the relevant code in order to get a technical datasheet and quotation for engineering review.
