• Cast Steel Material: The valve body is made of high-quality cast steel, featuring high strength and excellent corrosion resistance, and can operate stably for a long time under harsh working conditions.

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

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

• Superior Sealing Performance: Equipped with high-performance elastic valve seats, it delivers outstanding bidirectional sealing performance, ensuring the valve maintains a tight seal under various operating conditions.

• Fire-safe Design: Compliant with API 607 standard, the valve can retain its sealing performance even in the event of a fire, preventing medium leakage.

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

• Stem Blowout Prevention Design: The valve stem adopts a blowout-proof design to ensure operational safety and prevent the stem from being blown out due to medium pressure.

• Compact Design: The overall structure is compact, saving installation space, and is particularly suitable for mounting environments with limited space.

• Flanged Connection: Flanged connection is adopted to ensure reliable installation and excellent 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.

• 2-3 piece body

• Full andreduced bore trunnion mounted

• Double block and bleed

• Single or double piston effect design anti-blow out stem

• Anti-static device

• Firesafe to AP1-607/6FA/IS0 10497 springloaded seats

• Sealant in jection on request NACE MR-01-75

• API Licenses:

  API6D

  API6DSS

  API6A-PSL4

• Pressure Class:

  ASME 150-2500

  API 2000-15000

• Service Type:

  Standard Temperature:-29℃ to 220℃/-20°F to 428°F

  Low Temperature:-46℃ to 150℃/-50°F to 302°F

  Cryogenic Temperature: -47℃ to -196℃/-52°F to-320°F

  Subsea(Shallow &Deep Water)

  Underground

  High Temperature:Above 220℃/428°F

J-VALVES SPE 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.