• API 607 Fire Safety Certification: Compliant with stringent API 607 fire test standards. Under fire conditions, the metal-to-metal sealing structure effectively prevents medium leakage and ensures system safety.

• Trunnion Mounted Ball Design: The ball is fixed and supported by upper and lower bearings, reducing operating torque. It is suitable for high-pressure and large-bore working conditions, ensuring long-term stable operation.

• Low-Emission Stem Sealing: Adopts high-performance packing combination and dynamic loading design, meeting the low-leakage requirements of ISO 15848-1 and EPA Method 21, and significantly reducing fugitive emissions.

• Quick Installation Structure: Features compact wafer-type or short face-to-face design with standardized flange interfaces, greatly simplifying the installation process and cutting on-site construction time and labor costs.

• Optional Double Block and Bleed (DBB) Function: An optional double block and bleed structure achieves double isolation of the pipeline, facilitating on-line pressure relief and maintenance, and improving overall system safety.

• Anti-Static Device: Built-in anti-static spring assembly ensures electrical continuity among the ball, stem and valve body, preventing fire or explosion risks caused by static accumulation.

• Blowout-Proof Stem Design: The stem adopts an integral blowout-proof structure, which prevents the stem from ejecting even under abnormal internal pressure, guaranteeing operational safety.

• Emergency Sealant Injection System: Emergency sealant injection ports are configured at seats and stems. Sealant can be injected under extreme working conditions or when sealing surfaces are damaged to restore sealing performance.

• Optional Full Bore / Reduced Bore Design: Full Bore or Reduced Bore options are available according to working condition requirements, optimizing flow capacity and cost efficiency.

API607 Certified Fire Safe Quick Install Trunnion Ball Valve Low Emission 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.