• A105 Forged Carbon Steel Material:The valve body is forged from ASTM A105 carbon steel with refined grains and dense structure, free of casting defects. Its strength and toughness are significantly superior to cast steel products, maintaining excellent structural integrity even under 900LB ultra-high pressure.

• Full Forged Structure:The valve body is integrally machined from a single forging, completely eliminating casting defects such as blowholes and sand inclusions. It delivers outstanding pressure-bearing capacity and anti-fatigue performance, especially suitable for ultra-large bore and ultra-high pressure service conditions.

• 30×30 Full Bore Large Bore Design:The 30-inch full bore design features a flow passage diameter identical to the pipeline inner diameter, ensuring maximum flow capacity with near-zero pressure drop, allowing unobstructed passage of pigs and intelligent pipeline inspection gauges.

• Trunnion-Mounted Ball Design:The ball is precisely supported and fixed by upper and lower trunnions, achieving sealing independent of medium pressure. It provides low and consistent operating torque, completely eliminating the risk of ball deformation and seal failure for the 30-inch ultra-large bore under 900LB ultra-high pressure.

• Double Piston Effect (DPE) Seats:Bi-directional sealing design. The seats automatically tighten against the ball in case of abnormal pressure buildup in the valve cavity to prevent overpressure, supporting DBB (Double Block & Bleed) functionality.

• RTJ Ring-Type Joint Flange:Equipped with ASME B16.5 RTJ (ring-type joint) flanges. Under 900LB ultra-high pressure, it forms absolutely reliable sealing with metal ring gaskets (octagonal/oval type), offering excellent resistance to thermal cycling and vibration.

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.