• F316 Forged Integral Body:Constructed from integrally die-forged ASTM A182 F316 austenitic stainless steel with a dense grain structure and free of casting defects, delivering over 30% higher mechanical strength than cast bodies. Containing 2%–3% molybdenum, F316 offers significantly better resistance to chloride pitting, crevice corrosion and intergranular corrosion than 304, making it suitable for media containing H₂S, CO₂, seawater and chemical substances.

• 8‑Inch Large Bore Design:DN200 nominal bore satisfies high‑flow ultra‑high‑pressure media transmission requirements. The full bore design allows smooth passage of pigs and intelligent inspection devices, while a reduced bore option is available for improved economy.

• 2500LB Ultra‑High Pressure Class:Class 2500 (PN420) pressure rating with a maximum working pressure of 42.0 MPa at ambient temperature, suitable for extreme applications including ultra‑high‑pressure natural gas gathering and transportation, hydrocracking and supercritical power generation.

• Trunnion‑Mounted Ball:The ball is secured in body bearings via upper and lower trunnions, maintaining precise positioning under ultra‑high differential pressure and thermal cycling conditions to prevent eccentric wear and deformation of sealing surfaces, ensuring long‑term reliable sealing for large‑bore valves under ultra‑high pressure.

• Dual Piston Effect (DPE) Seats:DPE seat design comes as standard to provide bidirectional double sealing, with cavity pressure supported by both upstream and downstream seats, ideal for ultra‑high‑pressure pipelines and critical isolation services requiring zero leakage.

• Optional Flanged / Welded Ends:Available with RF (Raised Face) or RTJ (Ring Type Joint) flanged connections as well as butt weld (BW) ends. Flanges conform to ASME B16.5, and RTJ ring grooves ensure reliable metal sealing under ultra‑high pressure.

8"2500LB F316 Stainless Steel 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.