• Forged Integral Valve Body:The valve body and bonnet are made of forged steel materials such as ASTM A105 / A350 LF2 / A182 F304 / F316, featuring refined grains and compact structure free from casting defects such as blowholes and sand inclusions. Its pressure-bearing capacity and fatigue resistance are significantly superior to castings.

• API 607 Fire-Safe Certification:The valve has passed strict fire tests in accordance with API 607 6th or 7th Edition, including fire exposure, cooling and operating cycle tests. It is verified that metal-to-metal contact between the metal seats and ball remains effectively sealed after soft seal burnout, preventing secondary disasters caused by medium leakage under fire conditions.

• 3-Piece Symmetrical Structure:Composed of the main valve body and two side end caps connected by bolts for easy disassembly. The internal trim can be maintained and replaced in-line without removing the entire valve from the pipeline, greatly reducing downtime.

• Fixed Ball / Trunnion Mounted Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure to load the seats. Operating torque is low and stable, completely eliminating the risk of ball deformation under high-pressure and large-size conditions, ensuring long-term sealing reliability.

• Double-Seat Bi-Directional Sealing:Optional Dual Piston Effect (DPE) seats or Double Isolation and Bleed (DIB‑1 / DIB‑2) structure provides reliable bi-directional sealing, meeting DBB (Double Block and Bleed) requirements and supporting on-line inspection and venting.

• Flanged Connection:RF (Raised Face) or RTJ (Ring Type Joint) flanges are adopted in compliance with ASME B16.5, ensuring reliable connection and sealing performance under high-pressure working 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.