• Austenitic Stainless Steel Forged Valve BodyThe valve body is forged from ASTM A182 F304/F316/F316L stainless steel, providing excellent resistance to general corrosion, pitting corrosion and stress corrosion cracking. The molybdenum-bearing F316/F316L grade offers significantly better chloride resistance than 304, making it ideal for seawater, chemical and high-chloride environments.

• Top-Entry In-Line Maintenance StructureAn independent bonnet is mounted on the top of the valve body. All internal components, including the ball, seats and seals, can be disassembled and replaced from the top without removing the pipe flanges on both sides. Maintenance time is reduced by more than 80% compared with side-entry valves.

• Three-Piece Symmetrical StructureComposed of a main body and two side end caps, it features bolted connections for easy disassembly and uniform stress distribution. Internal parts can be maintained in-line without removing the entire valve from the pipeline.

• Trunnion-Mounted Ball DesignThe ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure to load the seats. It delivers low and stable operating torque, completely eliminating ball deformation under high-pressure and large-bore conditions and ensuring long-term sealing reliability.

• Double-Seat Bi-Directional SealingOptional double piston effect (DPE) seats or double isolation and bleed (DIB-1/DIB-2) structure ensures reliable bi-directional sealing, meets DBB (Double Block & Bleed) requirements, and supports in-line testing and bleeding.

• Flanged ConnectionRF (Raised Face) or RTJ (Ring-Type Joint) flanges are applied in accordance with ASME B16.5, guaranteeing reliable connection and sealing performance under high-pressure service.

• Fire-Safe DesignIn compliance with API 6FA/API 607 standards, metal-to-metal sealing remains effective in blocking media flow after soft seals are burned out, preventing secondary disasters caused by media leakage under 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.