• F316 Austenitic Stainless Steel Material:The valve body is forged from ASTM A182 F316 (0Cr17Ni12Mo2) with a molybdenum content of 2–3%. Its resistance to pitting corrosion, crevice corrosion and chloride stress corrosion is significantly superior to 304 stainless steel. It features excellent high-temperature creep strength, suitable for sour, chloride-containing and high-temperature corrosive media.

• Forged Three-Piece Structure:The main body and side end caps are all fully machined from forgings, featuring dense grain structure and free of casting defects. The symmetrical three-piece design ensures uniform stress distribution, allowing easy in-line disassembly and maintenance without removing the entire valve from the pipeline.

• Trunnion-Mounted Ball Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure. It provides low and consistent operating torque, completely eliminating the risk of ball deformation and seal failure under 2500LB ultra-high pressure.

• Double-Seat Ultra-High Pressure Sealing:Adopts metal seal with flexible graphite or PEEK composite seats to realize reliable bi-directional sealing. Double piston effect (DPE) or double isolation and bleed (DIB-1/DIB-2) structures are available to meet the strictest isolation requirements.

• RTJ Ring-Type Joint Flange:Equipped with ASME B16.5 RTJ (ring-type joint) flanges. Under 2500LB ultra-high pressure, it forms absolutely reliable sealing with metal ring gaskets (octagonal/oval type), delivering excellent resistance to thermal cycling and vibration.

• Fire-Safe Design:In compliance with API 6FA, in the event of soft seal burnout, direct contact between the metal ball and metal seat creates a metal-to-metal seal, effectively blocking media flow even under ultra-high pressure fire conditions.

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.