• Forged Stainless Steel Body: Constructed from integrally die-forged ASTM A182 F304/F316/F316L austenitic stainless steel, featuring a dense grain structure free of casting defects, with mechanical strength more than 30% higher than cast steel. Grade 316 contains 2%–3% molybdenum, delivering excellent resistance to chloride pitting, crevice corrosion and intergranular corrosion, making it suitable for sour, chloride-containing and marine environments.

• 6-Inch Large Bore Design: DN150 nominal bore satisfies high-flow, high-pressure fluid transportation requirements. Full bore design enables smooth passage of pigs and intelligent inspection devices; reduced bore is available as an option for improved economy, lower weight and reduced operating torque.

• 900LB High Pressure Class: Class 900 (PN150) pressure rating, with a maximum working pressure of 15.3 MPa at ambient temperature, suitable for severe applications including high-pressure natural gas gathering and transportation, hydrocracking, and high-pressure chemical processing units.

• Trunnion-Mounted Ball: The ball is secured in body bearings via upper and lower trunnions, maintaining precise positioning under 900LB high pressure differential and thermal cycling conditions, preventing eccentric wear and deformation of sealing surfaces, and ensuring long-term reliable sealing in large-bore high-pressure service.

• Optional Dual Piston Effect (DPE) Seats: DPE seat design is available to achieve bidirectional double sealing, with cavity pressure supported by both upstream and downstream seats, ideal for high-pressure pipelines and critical isolation services where leakage is prohibited.

• Flanged / Welded End Options: Offered with RF (Raised Face) or RTJ (Ring Type Joint) flanged ends, as well as BW (Butt Weld) ends. Flanges conform to ASME B16.5, and RTJ ring grooves ensure reliable metal-to-metal sealing under high pressure.

6"900LB 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.