• Integral Forged Body:Both valve body and end caps are manufactured from forged steels including ASTM A105, A350 LF2, A182 F304 and F316. Featuring refined grain and compact structure free of casting defects such as blowholes and sand inclusions, it provides significantly higher pressure resistance and fatigue performance than cast valves.

• Three-Piece Symmetrical Structure:Consists of a main body and two side end caps connected by bolts for easy disassembly. Trim parts can be maintained and replaced online without removing the entire valve from the pipeline, greatly reducing downtime.

• Fixed Ball / Trunnion Supported Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of line pressure. Operating torque is low and stable, completely eliminating ball deformation under 2500LB ultra-high pressure conditions.

• 12×10 Reduced Bore Design:With nominal size 12” and flow bore diameter 10” (reduced bore), the design cuts weight by approximately 20%, operating torque by 15% and cost while maintaining process flow capacity. It is ideal for ultra-high pressure piping systems that do not require full-bore pigging.

• Double-Seat Ultra-High Pressure Sealing:Adopts metal seal with flexible graphite or PEEK composite seats to deliver reliable bi-directional sealing. Double Piston Effect (DPE) or Double Isolation and Bleed (DIB‑1/DIB‑2) configurations are available to meet the strictest isolation requirements.

• RTJ Flange Connection:Equipped with ASME B16.5 RTJ (Ring Type Joint) flanges. When used with metal ring gaskets (octagonal / oval type), it ensures absolutely secure sealing at 2500LB ultra-high pressure, with excellent resistance to thermal cycling and vibration.

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

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.