• F316 Fully Forged Body:Manufactured from ASTM A182 F316 austenitic stainless steel by integral die forging, featuring a dense grain structure free of casting defects, with mechanical strength improved by over 30% compared to cast valve bodies. Containing 2%–3% molybdenum, F316 delivers excellent resistance to chloride pitting corrosion, crevice corrosion and intergranular corrosion, making it suitable for sour, chlorinated and offshore marine environments.

• Full Bore Design (6" × 5"):The valve has a nominal size of 6 inches, with a bore diameter matching the inner diameter of 5-inch standard pipelines. The flow resistance coefficient is nearly zero (maximized Cv value) with extremely low pressure drop, allowing smooth passage of pigs and intelligent inline inspection tools, supporting pipeline in-line inspection and internal inspection.

• Class 2500 Ultra-High Pressure Rating:With a pressure class of Class 2500 (PN420) and a maximum working pressure of 42.0 MPa at ambient temperature, it is designed for extreme applications including ultra-high pressure natural gas gathering and transportation, hydrocracking, and supercritical power generation.

• Trunnion-Mounted Ball:The ball is fixed in the body bearings via upper and lower trunnions, maintaining precise positioning under ultra-high pressure differentials and temperature fluctuations, preventing uneven wear and deformation of sealing surfaces, ensuring long-term reliable sealing in large-bore high-pressure service.

• Dual Piston Effect Seat (DPE):Standard DPE seat design provides bi-directional double sealing, with cavity pressure supported by both upstream and downstream seats, ideal for ultra-high pressure pipelines and critical isolation services where zero leakage is required.

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

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

6x5"2500LB F316 Full Bore 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.