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

• Reduced Full Bore Design (4x3" Full Bore):4-inch valve body matched with a 3-inch full bore flow passage. The valve body provides a large pressure-bearing area and sufficient wall thickness to meet the 1500LB pressure class requirement. The 3-inch full bore ball matches the pipeline inner diameter, ensuring high flow capacity and smooth passage of pipeline pigs, while reducing operating torque and actuator cost.

• Trunnion Mounted Ball Design:The ball is supported and fixed by upper and lower trunnions. Initial sealing is achieved by seat spring preloading, with medium pressure further enhancing the sealing effect. Operating torque is significantly lower than that of a floating ball design, preventing ball displacement caused by pressure differential under high pressure that may result in seal failure, ensuring stable and controllable opening and closing.

• Three-Piece Forged Structure:The valve body consists of a main body and two side end caps, facilitating maintenance and replacement of internal components. The forged structure offers much higher pressure resistance than castings, satisfying the 1500LB high-pressure requirement.

• Buried Installation:The valve stem is extended to ground-operating height, allowing direct buried installation with ground operation without a valve pit or with reduced pit depth.

• Low-Temperature Service:The extended stem reduces the temperature gradient at the stuffing box, protecting the packing and actuator to adapt to low-temperature media.

• Insulation Compatibility:The stem passes through equipment or pipeline insulation layers for easy operation outside the insulation.

• Heat Radiation Protection:Keeps operators away from the heat radiation zone of the valve body under high-temperature conditions, ensuring operational safety.

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

4x3"1500LB A105N Full Bore Trunnion Mounted Ball Valve with Extended Stem 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.