• A105 Forged Carbon Steel Material:The valve body is made of ASTM A105 forged steel with refined grains and compact structure, free of casting defects. Its strength and toughness are significantly superior to castings, maintaining excellent structural integrity even under 900LB ultra-high pressure.

• Forged 3-Piece Structure:The main valve body and both side end caps are fully machined from forgings. The symmetrical three-piece design ensures uniform stress distribution and allows easy in-line disassembly and maintenance without removing the entire valve from the pipeline.

• Full Bore Large Size Design:The 30×30″ full bore design features a flow passage diameter identical to the pipeline inner diameter, guaranteeing maximum flow capacity with near-zero pressure drop and enabling unobstructed passage of pigs and intelligent inspection gauges.

• Fixed Ball / Trunnion Mounted Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure. Operating torque is low and consistent, completely eliminating the risk of ball deformation and seal failure for the 30-inch large-bore valve under 900LB ultra-high pressure.

• Double-Seat Ultra-High Pressure Sealing:Bi-directional reliable sealing is achieved using metal seal with flexible graphite or PEEK composite seats. Dual Piston Effect (DPE) or Double Isolation and Bleed (DIB‑1 / DIB‑2) structures are available as options to meet the most stringent isolation requirements.

• RTJ Ring Type Joint Flange:Flanges conforming to ASME B16.5 RTJ (Ring Type Joint) are adopted. With metal ring gaskets (octagonal / oval type), they provide absolutely reliable sealing under 900LB ultra-high pressure and exhibit excellent resistance to thermal cycling and vibration.

• Fire-Safe Design:In compliance with API 6FA standard, direct contact between the metal ball and metal seats forms a metal-to-metal seal after the soft seal is burned out, ensuring effective shut-off of the medium 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.