• Three-Piece Body Structure:The valve body consists of a central main body and two side bodies connected by bolts. Internals such as the ball, seats and stem can be replaced without removing the valve from the pipeline, reducing maintenance downtime by more than 70%. This design is especially suitable for continuous production systems that cannot be shut down.

• Ball Sealing Surface:HVOF sprayed tungsten carbide, nickel-based alloy or Stellite alloy hardfacing, with hardness ≥ 68 HRC, providing excellent wear resistance and high-temperature performance.

• Seat Sealing Surface:Inconel 718, Stellite 6 or tungsten carbide hardfacing, forming a precision-matched metal sealing pair with the ball.

• Seat Class:Leakage Class V or VI in accordance with API 598, with no risk of softening, decomposition or cold flow under high temperatures.

• Trunnion-Mounted Ball:The ball is secured in the body bearings by upper and lower trunnions, maintaining precise positioning under high pressure differential and fluctuating temperature conditions. It prevents eccentric wear and deformation of sealing surfaces found in floating ball valves, ensuring long-term reliable sealing.

• Spring-Loaded Seats:Disc springs or coil springs are installed behind the seats to automatically compensate for thermal expansion differences and wear of metal sealing surfaces, maintaining constant sealing specific pressure and extending service life.

• Flanged Connection:RF (Raised Face) or RTJ (Ring Type Joint) flanged connections complying with ASME B16.5, facilitating integration with existing piping systems and online maintenance.

• Scraper-Type Seat Design:A hard alloy scraper ring is fitted at the front of the seat, which automatically removes deposits during ball rotation and prevents solid particles from entering the sealing surfaces. It is suitable for abrasive media containing catalysts, coke, slurry and other particles.

• Fire-Safe Design:The metal seal is inherently fire-safe, complying with API 607 / ISO 10497. Sealing performance is maintained in fire conditions without the need for a soft seal backup.

3 Piece Metal Sealed Flange 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.