Conventional Safety Valve Manufacturer in India

Conventional spring-loaded safety valves use direct spring force to maintain the closed position until the set pressure is reached. They are widely applied where outlet back pressure remains within the limits allowed by the valve design. The key engineering considerations are set pressure, blowdown, relieving capacity, temperature, spring range and the effect of superimposed or built-up back pressure. Speciality Valve manufactures conventional spring-loaded safety valve configurations for industrial pressure-relief applications, with the valve arrangement selected according to the protected equipment and service conditions.

Spring-Loaded Valve Technical Data:

Blowdown and Back Pressure:

• Set pressure: The pressure at which the valve is calibrated to open under the specified test conditions.

• Overpressure: The pressure increase available to develop the required relieving capacity.

• Blowdown: The pressure difference between opening and reseating.

• Superimposed back pressure: Outlet pressure present before the valve opens.

• Built-up back pressure: Outlet pressure generated by flow through the discharge system.

• Stability: Excessive back pressure or incorrect inlet/discharge piping can affect valve performance.

• Inlet pressure loss: Excessive pressure loss upstream of the valve can affect opening characteristics and stability.

• Spring range: The spring must be appropriate for the required set-pressure range and temperature conditions.

A conventional arrangement is generally most straightforward where the outlet pressure conditions are predictable and remain within the limits established for the selected valve.

Body Materials and Service Grades:

Material selection must account for the relieving temperature, process fluid and corrosion conditions. Seating, spring and internal trim materials can require separate consideration from the pressure-containing body.

Typical Relief Duties:

• Boiler and steam headers: Protects steam systems against pressure exceeding the permitted limit.

• Compressed gas systems: Provides relief for pressure-containing gas equipment.

• Process vessels: Protects vessels against credible overpressure scenarios.

• Hydrocarbon equipment: Used on compatible refinery and process equipment.

• Utility pressure systems: Suitable where the pressure and back-pressure conditions remain within the valve's design limits.

• Gas and vapour systems: Used where the required relieving capacity and discharge arrangement can be accommodated by the selected design.

Connection and Installation Considerations:

Codes, Testing and Certification:

• ASME BPVC Section XIII: Applicable rules for pressure-relief devices.

• API 520: Sizing and selection guidance for applicable services.

• API 521: Relief-system considerations for process installations.

• API 526: Applicable dimensions and configurations for flanged steel pressure-relief valves.

• API 527: Seat-tightness testing for applicable safety-valve designs.

• Testing: Set-pressure verification, seat-tightness testing and pressure testing should follow the applicable specification.

Send the valve set pressure, relieving medium, operating temperature and required capacity to Speciality Valve to discuss a suitable conventional safety valve configuration and obtain a quotation.