• F304 Forged Stainless Steel Body:Manufactured from ASTM A182 F304 austenitic stainless steel by integral die forging, it features a dense grain structure and excellent low-temperature toughness. Charpy V‑notch impact energy is ≥27 J at -196℃, eliminating the risk of brittle fracture under cryogenic service. Grade 304 provides outstanding resistance to uniform corrosion and intergranular corrosion, making it suitable for clean low‑temperature media.

• Three-Piece Body Structure:The valve body consists of a central main body and two side bodies connected by bolts. Internal components such as the ball, seats and stem can be replaced without removing the valve from the pipeline, greatly reducing downtime and maintenance costs for cryogenic systems. It is especially ideal for continuous production systems that cannot be shut down.

• 8‑Inch Large‑Bore Design:DN200 nominal size meets the requirements of high‑pressure LNG export and large‑flow cryogenic medium transportation. Full bore design facilitates pigging operations, while reduced bore is available for optimized cost efficiency.

• Class 900 High‑Pressure Rating:With a pressure class of Class 900 (PN150) and a maximum working pressure of 15.3 MPa at ambient temperature, it satisfies high‑pressure applications including high‑pressure natural gas transmission after LNG vaporization and cryogenic pump discharge.

• Trunnion‑Mounted Ball:The ball is secured in body bearings by upper and lower trunnions, maintaining precise positioning under low‑temperature contraction, high differential pressure and thermal cycling conditions. It prevents ball deflection and uneven seal wear common in floating ball valves, ensuring long‑term reliable sealing for large‑bore cryogenic valves.

• Extended Cryogenic Bonnet:The bonnet is extended above the seat ring, keeping the packing gland area away from the -196℃ cryogenic medium. The temperature gradient ensures the packing operates above 0℃, preventing stem freezing and operational sticking. Extended dimensions comply with BS 6364 / ISO 28921‑1.

• Optional Vacuum Insulation Jacket:Vacuum jacket or polyurethane foam insulation is available for the bonnet and body to reduce cold loss, prevent external surface frosting and personnel frostbite, and improve overall system energy efficiency.

8" 900LB F304 3PC Cryogenic Trunnion Mounted Ball Valve 3D Diagram

J-VALVESSPE can supply a range ofseat types and configurationsto meet specific process needs:

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

Seat Design	Single piston effect (SPE)	Double piston effect(DPE)-DIB 1	Combined DIB 2
Bi-directional sealing	Yes	Yes	Yes
Body-Cavity Self relieving	Yes	No	Yes
Double Barrier	No	Yes	Yes (preferred direction only)

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.