• F11 Chrome-Moly Alloy Forged Steel Material:The valve body is integrally machined from ASTM A182 F11 (1.25Cr-0.5Mo) forged steel, featuring excellent high-temperature strength, creep resistance, oxidation resistance and erosion resistance. It is suitable for high-temperature and high-pressure steam service at 540℃~580℃, performing significantly better than carbon steel and stainless steel.

• Three-Piece (3PC) Forged Structure:The valve body consists of a main body and two side end caps, facilitating online maintenance, internals replacement and seat inspection without removing the valve from the pipeline, greatly reducing system downtime. The forged structure offers much higher pressure-bearing capacity than castings, meeting 2500LB ultra-high pressure requirements.

• Trunnion Mounted Ball Design:The 8" large-bore ball is supported and fixed by upper and lower trunnions. Initial sealing is achieved by seat spring preloading, with medium pressure further enhancing the sealing effect. Operating torque is considerably lower than that of a floating ball design, preventing ball displacement caused by extreme pressure differential under ultra-high pressure and large-bore conditions that could result in seal failure, ensuring stable and controllable opening and closing.

• Metal Hard Seal Structure:Sealing surfaces of the seat and ball are hardfaced with Stellite alloy, Inconel nickel-based alloy or tungsten carbide, providing high temperature resistance, wear resistance and erosion resistance with durable and stable sealing performance, suitable for high-temperature, high-pressure conditions and media containing solid particles. Soft seal options are not applicable.

• RTJ Ring Type Joint Flange:RTJ (Ring Type Joint) flanged connection is adopted in accordance with ASME B16.5. The 2500LB ultra-high pressure class ensures reliable sealing under high-temperature and high-pressure service. Oval or octagonal metal ring gaskets adapt to thermal cycling conditions.

• Pressure-Self-Sealing Bonnet:The bonnet and body adopt a pressure-self-energized sealing structure (wedge gasket or octagonal gasket). The higher the medium pressure, the more reliable the sealing, accommodating thermal expansion and contraction cycles under high-temperature and high-pressure conditions.

8"2500LB High Temperature And High Pressure 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.