• A105N Normalized Cast Steel Body:Precision-cast from carbon steel normalized to ASTM A105N standard. The normalization process refines grains and relieves casting stresses, improving low-temperature impact toughness by over 50% compared to standard A105, with excellent weldability. It is suitable for low-temperature service down to -46°C and welded installations. The casting process is ideal for small-bore complex configurations such as 2-inch size, reducing costs by 15%–25% and shortening delivery lead times compared to forging.

• 2-Inch Standard Bore:DN50 nominal diameter is designed for medium to small flow high-pressure media transmission. Full bore design facilitates pigging and system purging, while reduced bore is available for improved economy.

• 1500LB Ultra-High Pressure Class:Class 1500 (PN260) pressure rating with a maximum working pressure of 25.5 MPa at ambient temperature, suitable for extreme applications including high-pressure gas fields, hydrogenation units and high-pressure test benches.

• Trunnion-Mounted Ball:The ball is secured in body bearings via upper and lower trunnions, maintaining precise positioning under 1500LB ultra-high differential pressure and thermal cycling conditions. This prevents ball deflection and eccentric wear of sealing surfaces common in floating ball valves, ensuring long-term reliable sealing under ultra-high pressure.

• Optional Dual Piston Effect (DPE) Seats:DPE seat design is available to achieve bidirectional double sealing, with cavity pressure supported by both upstream and downstream seats, ideal for ultra-high pressure pipelines and critical isolation services where zero leakage is required.

• Threaded Connection:NPT (ASME B1.20.1) or BSP (ISO 7-1), enabling quick on-site installation.

• Socket Weld (SW):Conforms to ASME B16.11, suitable for high-pressure welded piping.

• Butt Weld (BW):Conforms to ASME B16.25, suitable for permanent high-pressure systems.

2"1500LB A105N Cast Trunnion Mounted Ball Valve 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.