• F11 Chrome-Molybdenum Alloy Steel Material:The valve body is made of ASTM A182 F11 (1.25Cr-0.5Mo) forged steel. The chrome-molybdenum alloy design delivers excellent high-temperature creep strength, rupture strength and thermal fatigue resistance. Its strength retention rate exceeds 80% at 600℃, which is significantly superior to carbon steel and stainless steel.

• Integral Forged Three-Piece Structure:The main valve body and both side end caps are fully machined from forgings with compact grains and no casting defects. The symmetrical three-piece design ensures uniform stress distribution and allows online disassembly and maintenance without removing the entire valve from the pipeline.

• Fixed Ball / Trunnion Supported Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure. The operating torque is low and stable, completely eliminating the risk of ball deformation and sealing failure under 8-inch large-bore and 2500LB ultra-high pressure conditions.

• High-Temperature & High-Pressure Metal Sealing:Adopts Stellite alloy overlay with flexible graphite energy rings or nickel-based alloy hard sealing, realizing zero-leakage metal-to-metal sealing at 600℃ high temperature and 42MPa ultra-high pressure.

• RTJ Ring Type Joint Flange:Equipped with ASME B16.5 RTJ (Ring Type Joint) flanges. When matched with metal ring gaskets (octagonal / oval type), it provides absolutely reliable sealing at 2500LB ultra-high pressure, with excellent resistance to thermal cycling and vibration.

• Pressure Seal Bonnet:The bonnet and valve body adopt a pressure self-sealing structure (Pressure Seal Bonnet). The higher the medium pressure, the more reliable the sealing, completely eliminating leakage risks caused by flange bolt relaxation under high temperature and high pressure.

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.