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

• Integral Forged 3-Piece Structure:The main valve body and both side end caps are fully machined from forgings with a dense grain structure and free of casting defects. The symmetrical three-piece design ensures uniform stress distribution and allows easy online disassembly and maintenance without removing the entire valve from the pipeline.

• Fixed Ball / Trunnion Mounted Design:The ball is precisely supported and fixed by upper and lower trunnions, independent of medium pressure for seat loading. It provides low and consistent operating torque, completely eliminating the risk of ball deformation and seal failure in 6-inch large-bore and 900LB high-pressure service.

• Bi-Directional Dual-Seat Sealing:Adopting double piston effect (DPE) seats or double isolation and bleed (DIB-1/DIB-2) structure, it achieves reliable bi-directional sealing, meets DBB (Double Block & Bleed) requirements, and supports online pressure relief and testing of the valve cavity.

• Flanged Connections:RF (Raised Face) or RTJ (Ring Type Joint) flanges are applied in accordance with ASME B16.5, ensuring reliable connections under 900LB high pressure and compatibility with standard piping systems.

• Fire-Safe Design:In compliance with API 6FA and API 607 standards. In the event of soft seal burnout, a secondary metal-to-metal seal is formed between the metal ball and metal seat to prevent medium leakage under fire conditions.

• Anti-Static Device:Conductive springs or pins are installed between the stem, ball and valve body to ensure continuous static dissipation, suitable for flammable and explosive media such as natural gas and oil-gas mixtures.

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.