• A105N Normalized Carbon Steel Forging Material:The valve body is integrally machined from ASTM A105N forged steel and normalized to improve toughness. It features a dense grain structure free of casting defects, excellent mechanical properties and high pressure-bearing capacity, making it suitable for high-pressure and low-temperature applications.

• Trunnion Mounted Ball Design:The 2" ball is supported and fixed by upper and lower trunnions. Initial sealing is achieved by seat spring preloading, with medium pressure assisting in enhancing sealing performance. Operating torque is significantly lower than that of floating ball designs, preventing ball displacement caused by extreme pressure differentials under 1500LB high-pressure conditions that could lead to seal failure. This ensures smooth and controllable opening and closing, while reducing actuator size and cost.

• Two-Piece or Three-Piece Forged Structure:The valve body consists of a main body and side end covers, facilitating convenient maintenance and replacement of internal components. The forged structure offers considerably higher pressure resistance than castings, meeting the requirements of 1500LB high-pressure service.

• Flanged Connection:RF (Raised Face) or RTJ (Ring Type Joint) flanged connections are adopted in accordance with ASME B16.5. The 1500LB pressure rating ensures reliable sealing under high-pressure operating conditions.

• Soft Seal:PTFE, RPTFE, PPL, suitable for ambient temperature applications and services requiring tight shut-off.

• Metal Hard Seal:Overlaid with Stellite alloy or nickel-based alloy, suitable for high-temperature, high-pressure conditions and media containing solid particles.

• Fire-Safe Design:Compliant with API 607 / API 6FA standards. In the event of fire, the metal seal or graphite packing maintains sealing integrity to prevent catastrophic leakage.

2"1500LB A105N 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.