3PC High-temperature And High-pressure Trunnion Ball Valve

• Forged Steel Material: The valve body is made of forged steel grades including A105, F304, F316, or F22, boasting excellent mechanical strength and impact resistance.

• Three-piece Structure: Composed of three sections, the valve body allows internal inspection by disassembling the middle section online, eliminating the need for pipeline cutting.

• Trunnion Mounted Design: The ball is fixed by upper and lower support shafts, preventing displacement caused by medium pressure, reducing operating torque, and making it ideal for high-pressure and large-diameter applications.

• Flange Connection: Available with RF, RTJ, or BW connection types, compliant with ASME B16.5/B16.25 standards to meet the requirements of different pipeline systems.

• Dual Seal System: The primary seal combines metal and soft sealing; the metal seal can function independently under fire-safe conditions.

• Fire-safe Design: Compliant with API 607/6FA standards, maintaining reliable sealing performance after fire incidents to prevent medium leakage.

• Anti-static Device: Equipped with a standard anti-static spring, ensuring the resistance between the ball, stem, and valve body is less than 10 ohms.

• Stem Blow-out Prevention: The stepped stem structure completely prevents stem ejection due to internal pressure, ensuring operational safety.

• Emergency Seal Greasing System: Grease injection valves are installed at the seat and stem positions, allowing temporary sealing by injecting sealant in emergency situations.

• Automatic Pressure Relief Function: When overpressure occurs in the valve cavity, the medium can be automatically discharged to the pipeline through the valve seat, protecting the valve.

• 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.