• A105N Normalized Forged Carbon Steel Material:The valve body is manufactured from ASTM A105N forged steel. After normalization heat treatment, it features refined grains and uniform microstructure. Its low-temperature impact toughness is improved by more than 30% compared with conventional A105, satisfying requirements for low-temperature service from -29℃ to -46℃ and eliminating the risk of low-temperature brittle fracture.

• Full Forged 3-Piece Structure:The valve body is fully machined from forgings with dense grains and free of casting defects. The symmetrical 3-piece design allows for on-line disassembly and maintenance without removing the entire valve from the pipeline.

• 0.75×0.5 Reduced Bore Design:The valve has a 0.75-inch inlet and a 0.5-inch flow passage diameter (reduced bore). It reduces weight, operating torque and cost while ensuring process flow capacity, making it suitable for high-pressure piping systems with limited installation space.

• Floating Ball Self-Sealing Design:The ball floats freely under medium pressure and tightly contacts the downstream seat to achieve self-energized sealing. The sealing performance becomes more reliable under 800LB ultra-high pressure, with a simple structure and sensitive response.

• Threaded / Socket Weld / Butt Weld End Connections:Optional NPT female threaded, SW socket weld or BW butt weld ends, conforming to ASME B16.11 / B16.25 standards, ensuring high connection reliability under 800LB ultra-high pressure.

• Fire-Safe Design:In compliance with API 607 standards, a secondary metal seal is formed between the metal ball and the metal seat ring in the event that the PTFE/RPTFE seals are burned out, preventing medium leakage under fire 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.