• F316 Forged Stainless Steel Material:The valve body is integrally machined from ASTM A182 F316 forged steel, featuring a dense metallic structure free of casting defects. It provides excellent corrosion resistance, high-temperature strength and mechanical properties, making it suitable for highly corrosive, high-temperature, high-pressure and alternating load conditions.

• Trunnion Mounted Ball Design:The 6" ball is supported and fixed by upper and lower trunnions. Initial sealing is achieved by seat spring preloading, with medium pressure assisting to enhance sealing performance. Operating torque is significantly lower than that of floating ball designs, preventing ball displacement caused by extreme pressure differentials under high-pressure conditions that could result in seal failure, ensuring smooth and controllable opening and closing.

• Three-Piece Forged Structure:The valve consists of a main body and two side end covers, facilitating convenient maintenance and replacement of internal components. The forged structure offers considerably higher pressure resistance than castings, meeting the requirements of 900LB high-pressure service.

• Metal Hard Sealed Structure:Seats and ball are overlaid with Stellite alloy, Inconel nickel-based alloy or tungsten carbide, providing high temperature resistance, wear resistance and erosion resistance, with durable and stable sealing performance. It is suitable for high-temperature, high-pressure conditions and media containing solid particles.

• Flanged Connection:RF (Raised Face) or RTJ (Ring Type Joint) flanged connections are adopted in accordance with ASME B16.5. The 900LB pressure rating ensures reliable sealing under high-pressure operating conditions.

• Fire-Safe Design:Compliant with API 6FA standard. In case of fire, the metal seal and graphite packing maintain sealing integrity to prevent catastrophic leakage.

• Anti-Static Device:Built-in anti-static spring and conductor ensure electrical continuity between the ball, stem and valve body, reducing the risk of explosion.

6"900LB 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.