• F316 Fully Forged Body;Constructed from ASTM A182 F316 austenitic stainless steel via integral die forging, featuring a dense grain structure free of casting defects. Mechanical strength is improved by more than 30% compared with cast valve bodies. With molybdenum content, F316 delivers outstanding resistance to chloride pitting, crevice corrosion and intergranular corrosion, making it suitable for sour, chloride-containing, high-temperature and high-pressure media.

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

• 8-Inch Large Bore Design:DN200 nominal bore satisfies high-flow high-pressure fluid delivery requirements. Full bore design enables smooth passage of pigs and intelligent inspection devices, while reduced bore is available for optimized cost efficiency.

• Trunnion-Mounted Ball:The ball is secured in the body bearings by upper and lower trunnions, maintaining precise positioning under ultra-high pressure differentials and thermal fluctuations. This prevents eccentric wear and deformation of sealing surfaces, ensuring long-term reliable sealing.

• Double Piston Effect Seat (DPE):Optional double piston effect seat design provides bi-directional double sealing, with cavity pressure supported by both upstream and downstream seats. Ideal for high-pressure natural gas pipelines and critical isolation services where zero leakage is required.

• Optional Flanged / Welded Ends:Supplied with RF/RTJ flanged ends or butt weld (BW) ends. Flanges conform to ASME B16.5, and RTJ ring grooves ensure reliable metal-to-metal sealing under high pressure.

• Fire-Safe Design:Compliant with API 607 / ISO 10497. In the event of fire damage to soft seats, metal seats come into contact with the ball to form a metal-to-metal seal, preventing media leakage during fire hazards.

• Anti-Static Device:Built-in anti-static spring ensures effective discharge of static electricity between the ball, stem and body, eliminating static accumulation caused by high-pressure high-velocity fluid flow that could lead to explosion.

• Blowout-Proof Stem Design:Bottom-loaded stem is equipped with a blowout-proof shoulder. The stem remains retained in the body even if the packing gland is accidentally removed, guaranteeing operational safety under ultra-high pressure conditions.

8" 2500LB F316 Forged 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.