Pneumatic Actuated Trunnion Ball valve

Pneumatic Actuated Trunnion Ball Valve manufacturer in USA 

SVR Global specializes in manufacture of trunnion mount pneumatic actuated ball valves, which are compliant with API 6D, API 608, and ASME B16.34 standards. The valves are offered to customers across the USA for use in the pipeline, petrochemical, gas transmission, and process piping industry. Every valve has a trunnion supported ball and is equipped with a double acting or spring return pneumatic actuator.

What is a Trunnion Mounted Ball Valve?

The trunnion ball valve keeps the ball in position on top and bottom stub shafts called trunnions, which prevent axial movement of the ball because of differential pressure acting on the ball. The sealing action is by means of spring loaded, adjustable seats that keep the ball closed regardless of the line pressure. This design is distinct from the floating ball valve, in which the ball is pushed into the seat for sealing and requires more torque.

Design Advantages Over Floating Ball Valves:

• Lower and more uniform operating torque across the full pressure range

• Reduced seat wear since the ball does not bear directly against the seat under full line pressure

• Suitability for larger diameters (up to 48 in. and beyond) and higher pressure classes (up to Class 2500)

• Bi-directional sealing with independent upstream and downstream seats

• Cavity self relief to prevent overpressure from thermal expansion of trapped media

Pneumatic Actuation Overview:

Actuator Types Supplied-

• Double acting pneumatic actuators - use supply air on both strokes for open and close require a fail last or fail in place configuration on air loss

• Spring return pneumatic actuators - fail safe close (or fail safe open) on loss of air supply, using a mechanical spring to drive the valve to its safe position

• Rack and pinion and scotch yoke actuator types, sized per valve breakaway, running, and end torque values

Control and Accessory Options-

• Solenoid valves (single or dual coil) for remote actuation

• Limit switch boxes for open/close position feedback

• Positioners for modulating or throttling duty

• Volume boosters and quick exhaust valves for faster stroke times

• Air filter regulators for supply air conditioning

• Declutchable manual override gearboxes for actuator failure conditions

Product Design Features:

• Full bore and reduced bore (standard bore) configurations

• Side entry, two piece and three piece body construction top entry design for in-line maintenance

• Metal seated and soft seated (PEEK, RPTFE) seat options depending on service temperature

• Double block and bleed (DBB) function with independent seat sealing

• Anti static device (conductive spring path between ball, stem, and body) for electrostatic grounding

• Anti blowout stem design to retain the stem under internal pressure

• Fire safe design per API 607 / API 6FA, with secondary metal to metal sealing on primary seat failure

• Sealant injection fittings on stem and seat for emergency sealing and lubrication

• Locking device for manual override and actuator mounting per ISO 5211

Materials of Construction:

Design and Test Standards:

• API 6D - Specification for Pipeline and Piping Valves

• API 608 - Metal Ball Valves, Flanged, Threaded, and Welding End

• API 598 - Valve Inspection and Testing

• API 607 / API 6FA - Fire Test for Soft Seated and Metal Seated Quarter Turn Valves

• ASME B16.34 - Pressure Temperature Ratings

• ASME B16.5 / B16.47 - Flange Dimensions

• ASME B16.25 / B16.10 - Butt Weld Ends and Face to Face Dimensions

• ISO 17292 - Metal Ball Valves for Petroleum, Petrochemical, and Allied Industries

Pressure classes range from Class 150 through Class 2500 (PN 20 to PN 420), in sizes from 2 in. through 48 in. NPS, with shell and seat hydrostatic testing performed per API 598 and additional low pressure air seat testing for tight shutoff verification.

Pneumatic Actuated Trunnion Ball Valve Applications:

• Pipeline mainline block valve stations and pig launcher/receiver isolation

• Petrochemical process unit isolation and ESD service

• Gas transmission and distribution metering and regulation stations

• LNG and gas processing plant piping

• Offshore platform and subsea pipeline isolation with corrosion resistant trims

• Terminal and tank farm loading/unloading lines

• Power generation plant fuel gas and utility piping

• Water injection and produced water handling systems in upstream operations