• WCB Cast Carbon Steel Valve Body: Made from austenitized heat‑treated ASTM A216 WCB cast steel, it features excellent mechanical strength, pressure resistance and castability. Suitable for valve bodies of various sizes, it is cost‑effective and ideal for general industrial applications.

• Double‑acting Type: Operated by air supply for opening and closing, with high torque and fast action, suitable for frequent cycling applications.

• Spring‑return Type: Automatically resets upon air failure (normally open or normally closed), suitable for safety shut‑off and emergency isolation.

• Pneumatic Modulating Type: Equipped with electro‑pneumatic positioner to achieve 4–20mA proportional control with a regulation accuracy of ±1%.

• Air Supply Requirement: 0.4–0.7 MPa clean compressed air, supplied with filter regulator.

• Ingress Protection: IP67/IP68, suitable for outdoor and harsh environments.

• Class 600 Medium‑High Pressure Rating: Class 600 (PN100) pressure class with a maximum working pressure of 10.0 MPa at ambient temperature, suitable for severe applications including high‑pressure natural gas, chemical media and steam.

• Trunnion‑mounted Ball: The ball is secured in body bearings by upper and lower trunnions, maintaining precise positioning under Class 600 high differential pressure and frequent operation. It prevents ball deflection and uneven sealing surface wear common in floating ball valves, ensuring long‑term reliable sealing.

• Double Seat Bi‑directional Sealing: Independent upstream and downstream seats provide bi‑directional sealing with unrestricted installation orientation. Seats are available in soft seal or metal seal to accommodate various media and temperature conditions.

• Flanged Connection: RF (Raised Face) or RTJ (Ring‑Type Joint) flanged ends complying with ASME B16.5, facilitating integration with existing high‑pressure piping systems and online maintenance.

Pneumatic Trunnion Mounted Ball Valve 3D Diagram

J-VALVESSPE can supply a range ofseat types and configurationsto meet specific process needs:

J-VALVES trunnion mounted ball valves standard seat ringsare soft-seated by the use of athermoplastic or elastomeric or Meta

Seats-Tungsten /Chrome carbide /ENP

Single Piston (SPE) , Double Piston effect (DPE) and Combination (SPE x DPE) seats are available.

Seat Princlple

Two independent seat rings grant the sealing, barrieragainst the line pressure actingon the upstream and downstreamsides of the valve which allows the valve tobe bidirectional.

A set ofcoil springs acting, between the upstream side ofeach seatring,andthe body,generate an uniform thrust on theseat which push the same against the ball and grant the sealingfeature with no orverylow pressureinthe line,when the line pressure increasethe thrust actingon theseat increases proportionally and the sealing leatureis granted throughout the fullpressure range.

The J-VALVES SPE trunnion mounted ball valves are available with Double

Block & Bleed in dependent oftheseat type.

Valve seating variations

Seat Design	Single piston effect (SPE)	Double piston effect(DPE)-DIB 1	Combined DIB 2
Bi-directional sealing	Yes	Yes	Yes
Body-Cavity Self relieving	Yes	No	Yes
Double Barrier	No	Yes	Yes (preferred direction only)

Single Piston Effect

Single piston effect (SPE) is the stand ard feature for theseat rings of the J-VALVES SPE trunnion mounted ball valves.

On a SPE seat ring:

The pressure ac tingon the upstream side ofthe seat ringgenerates aforce which push theseattowards the ball.The pressure actingon the downstream side ofthe seatring generates a force which pull theseatring away fromthe ball.

Anyoverpressure which may be generated by the thermal expansion of the fluid trapped in thebodycavity with the ballin fully closed position, will beautomatically dischargedinthe line on the lower pressure side.

Double Piston Effect

Double piston effect(DPE) is a stand ard feature fortheseat rings ofthe J-VALVES trunnion mounted ball valves & recommended forwelded body valves. Ona DPE seat ring, both the pressure acting on the upstream sideof theseatring andthe pressure acting on thedownstreamside of the  seatring, generatea forcewhich push the seattowards the ball.

With th is type ofseat ring,the eventual over press ure whichmay be generated by the thermal expansion ofthe fluidtrappedinthebodyeavitywith theball in fullyclosed position,can be discharged by the use of:

An external safetyrelief device.

The Double Piston Effect grants a double sealingfeature,iftheupstreamseat ringisdamaged, thedown stream seatgrant the sealingfeature of the valve.