• WCB Carbon Steel Material: The valve body is cast from ASTM A216 WCB carbon steel, featuring high strength, good weldability and cost-effectiveness, suitable for general service conditions.

• Trunnion Mounted Design: The ball is supported by upper and lower trunnion shafts. Bearings bear the thrust generated by medium pressure, delivering low operating torque and stable sealing performance, especially ideal for large-bore and high-pressure working conditions.

• 12x10" Reduced Bore Design: With a reduced bore structure of 12" inlet and 10" outlet, the valve maintains flow capacity while reducing weight and cost, facilitating installation and transportation.

• Dual Piston Effect (DPE) Seat: The seat adopts a dual piston effect design, achieving reliable bi-directional sealing regardless of medium flow direction.

• Integrated Bleed Needle Valve: A bleed needle valve is integrated in the middle of the valve body. It enables safe cavity pressure relief and medium discharge after valve closure, meets DBB (Double Block and Bleed) functional requirements, and ensures maintenance safety.

• Flange Connection: Adopts RF (Raised Face) or RTJ (Ring Type Joint) flange connection complying with ASME B16.5 standard, guaranteeing sealing reliability under high-pressure conditions.

• Fire Safe Design: Compliant with API 607 / API 6FA standards. The valve can maintain sealing performance even in fire scenarios to prevent medium leakage.

• Anti-static Device: Built-in anti-static device effectively prevents static accumulation and reduces fire and explosion risks.

• Anti-blowout Stem Design: The valve stem features an anti-blowout structure to ensure operational safety.

• Emergency Sealant Injection System: Grease injection ports are equipped at the seat and stem areas. Sealant can be injected in emergency situations to realize temporary sealing.

• Actuator Interface: Fitted with ISO 5211 standard flange interface, compatible with manual worm gear, pneumatic, electric and hydraulic actuators.

12x10" WCB Trunnion Ball Valve with Needle Vent Valve API6D Standard 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.