• Three-piece Design: The valve body is divided into three sections, facilitating maintenance and parts replacement, reducing downtime while enhancing the valve's overall structural strength and sealing performance.

• Side-mounted Design: The ball and valve seat are fixed to the valve body in a side-mounted configuration, providing additional support to ensure stable operation under medium and high-pressure conditions and reduce the load on the valve seat.

• Trunnion Mounted Design: The ball is fixed to the valve body via trunnions, providing extra support to ensure smooth operation under high-pressure conditions and alleviate the load on the valve seat.

• Sealing Performance: Equipped with high-performance elastic valve seats, it delivers outstanding bidirectional sealing performance and maintains a reliable seal under all operating conditions.

• Fire-Safe Design: Compliant with API 607 standard, the valve retains its sealing performance even in the event of a fire to prevent medium leakage.

• Anti-Static Device: A built-in anti-static device effectively prevents electrostatic accumulation and mitigates the risks of fire and explosion.

• Stem Blowout Prevention Design: The valve stem features a blowout-proof design to ensure operational safety and prevent ejection caused by medium pressure.

• Compact Design: The integral structure is compact, saving installation space and making it ideal for mounting in space-constrained environments.

• Flanged Connection: Flanged connection is adopted for reliable installation and superior sealing performance, facilitating seamless integration with existing pipeline systems.

• Multiple Operation Modes: Various operation modes including manual (handwheel operation), pneumatic and electric are available to meet the requirements of different working conditions.

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

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.