• A105N Normalized Forged Carbon Steel Construction:The valve body is forged from ASTM A105N carbon steel. After normalization heat treatment, the grain structure is refined and uniform, and low-temperature impact toughness is improved by more than 30% compared with conventional A105. It meets service requirements from -29℃ down to -46℃, eliminating the risk of low-temperature brittle fracture.

• Solid Forged Structure:The valve body is fully machined from a single forging with dense grain structure and free of casting defects. Its pressure-bearing capacity and fatigue life are significantly superior to cast valves, making it especially suitable for 1500LB ultra-high pressure pulsating service conditions.

• 4×3 Reduced Bore Design:Nominal valve size: 4 inches, flow bore diameter: 3 inches (reduced bore). While ensuring sufficient process flow capacity, this design reduces weight by approximately 20%, operating torque by 15%, and overall cost. It is ideal for ultra-high pressure piping systems that do not require full-bore pigging.

• Trunnion-Mounted Ball Design:The ball is precisely supported by upper and lower trunnions, with seating force independent of medium pressure. Operating torque is low and consistent, completely eliminating ball deformation and sealing failure risks under 1500LB ultra-high pressure.

• Dual-Seat Ultra-High Pressure Sealing:Adopts Double Piston Effect (DPE) seats or Double Isolation and Bleed (DIB‑1/DIB‑2) structure to achieve reliable bi-directional sealing. It satisfies DBB (Double Block & Bleed) requirements and supports online cavity pressure relief and testing.

• 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 1500LB ultra-high pressure, with 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.