• Jacketed Insulation Structure: The valve body is integrally cast or welded with a jacket layer on the exterior to form a uniform flow channel for heating medium. It maintains a constant temperature around the valve body and ball, effectively preventing medium solidification and crystallization inside the valve cavity.

• Full Bore / Reduced Bore Design: Optional Full Bore or Reduced Bore structure. Full bore minimizes flow resistance and is ideal for high-viscosity media; reduced bore lowers cost and suits general working conditions.

• 2-Piece / 3-Piece Design: The valve body adopts two-piece or three-piece construction with an integrated jacket and body design, facilitating easy maintenance and parts replacement to reduce downtime.

• Floating Ball Design: The ball floats freely under medium pressure and closely fits the seat to achieve excellent sealing performance, maintaining reliable tight shutoff even under low-temperature and high-viscosity working conditions.

• Flange Connection: Adopts RF (Raised Face) flange connection complying with ASME B16.5 standard. The jacket is equipped with independent flange ports (usually 1/2″ to 2″) for easy inlet and outlet connection of heating medium.

• Fire Safe Design: Compliant with API 607 standard, the valve maintains stable sealing performance under fire conditions to avoid medium leakage.

• Anti-Static Device: Built-in anti-static structure effectively prevents static accumulation and reduces fire and explosion risks.

• Blowout-Proof Stem Design: The stem features a blowout-proof structure to ensure safe operation.

• Low Emission Packing System: High-performance packing is adopted to meet ISO 15848 low-emission requirements and prevent leakage of process medium or heating medium.

• Compact Structure: Integrated design of jacket and valve body features small size and light weight, easy for installation and integration into existing thermal insulation systems.

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.