Pilot Operated Safety Valve Manufacturer in India

Pilot operated safety valves use a pilot control system to regulate the pressure acting on the main valve and are used where conventional spring-loaded arrangements may be limited by high pressure, large capacity requirements or back-pressure conditions. Their performance depends heavily on pilot configuration, sensing arrangement, set pressure, blowdown control and the cleanliness of the process medium. Speciality Valve manufactures pilot operated safety valve configurations for industrial pressure-relief applications, with the valve arrangement selected according to the protected equipment and service conditions.

Pilot Valve Configuration:

Parameter	Technical Details
Valve Type	Pilot Operated Safety Valve
Main Valve	Piston or diaphragm-controlled, design dependent
Pilot System	Pressure-actuated pilot mechanism
Set Pressure	Application-specific
Relieving Medium	Gas, vapour or liquid, according to design
Sensing	Internal or external, configuration dependent
Connection	Flanged or specified process connection
Back Pressure	Evaluated during sizing and configuration
Blowdown	Controlled according to pilot and main-valve design

Where Pilot Operation Has an Advantage?

High-pressure gas systems: Pilot control can maintain tight seating until the defined opening condition is reached.
Large relieving capacities: Main-valve sizing can accommodate substantial flow while the pilot controls the operating condition.
Variable back pressure: Appropriate balanced configurations can reduce the effect of outlet pressure on the main valve.
Low operating-to-set-pressure margin: Pilot systems can provide tight operation where the normal operating pressure is relatively close to the set pressure.
Remote sensing arrangements: External sensing can be used where the pressure at the valve inlet does not accurately represent the protected equipment pressure.
High-capacity process equipment: Pilot-controlled main valves can be considered where conventional spring-loaded capacity would require a larger valve arrangement.

Materials for Pilot and Main Valve:

Material	Typical Service Consideration
Carbon Steel	General hydrocarbon and gas service
Low-Temperature Carbon Steel	Low-temperature process systems
Stainless Steel	Corrosive or moisture-sensitive services
Duplex Stainless Steel	Selected chloride-containing applications
Alloy Steel	Elevated-temperature duties
Nickel Alloys	Selected aggressive chemical services

Material Grades:

Grade	Classification
ASTM A216 WCB	Cast carbon steel
ASTM A352 LCC	Low-temperature carbon steel
ASTM A217 WC6	Chromium-molybdenum steel
ASTM A351 CF8M	Austenitic stainless steel
ASTM A890 4A	Duplex stainless steel
ASTM A182 F22	Forged chromium-molybdenum steel

High-Pressure Relief Applications:
Natural gas processing: Protection of separators, vessels and high-pressure gas equipment.
LNG facilities: Selected gas-service relief duties where the valve and materials are suitable.
Refinery process units: High-pressure hydrocarbon and gas protection.
Gas transmission systems: Overpressure protection for compatible high-pressure gas equipment.
Chemical processing: Process-gas relief where pilot components are compatible with the medium.
Pilot System Performance Checks:
Verify pilot sensing pressure at the required location.
Check the set pressure against the protected equipment MAWP.
Determine the required relieving capacity for the governing contingency.
Evaluate superimposed and built-up back pressure.
Confirm process cleanliness where small pilot passages could be affected by contaminants.
Check blowdown characteristics and reseating requirements.
Ensure inlet and discharge piping meet the applicable installation requirements.
Confirm sensing-line arrangement and pressure-loss limitations where external sensing is used.
Standards and Verification:
ASME BPVC Section XIII: Applicable overpressure protection requirements.
API 520: Sizing and selection of pressure-relieving devices.
API 521: Pressure-relieving system and disposal considerations.
API 526: Applicable where the valve falls within the flanged steel pressure-relief valve scope.
API 527: Seat-tightness requirements for applicable designs.
Functional testing: Pilot and main-valve operation should be verified according to the applicable product and project requirements.
Share the relieving medium, set pressure, operating pressure, temperature and required capacity with Speciality Valve to discuss the appropriate pilot-operated safety valve configuration and obtain a quotation.