• A105 Forged Carbon Steel Body:Manufactured from ASTM A105 standard forged carbon steel via integral die forging, it features a dense grain structure free of casting defects and higher mechanical strength than cast steel. It is suitable for medium-low to medium-high pressure conditions and offers an economical and practical cost solution.

• Reduced Bore Design (8" × 6"):The nominal valve size is 8 inches with a 6-inch flow bore. This reduced bore design reduces valve weight by 25%–35%, operating torque by 20%–30% and manufacturing costs, while meeting flow requirements for most medium-to-large bore process pipelines and improving economic efficiency.

• Trunnion-Mounted Ball:The ball is secured in the body bearings by upper and lower trunnions, maintaining precise positioning under Class 150 pressure differential conditions. It avoids ball deflection and uneven wear of sealing faces common in floating ball valves, ensuring long-term reliable sealing for medium-to-large bore valves.

• Dual-Seat Bi-Directional Sealing:Independent upstream and downstream seats provide bi-directional sealing with no installation orientation restrictions. Soft or metal seats are available to suit various media and temperature conditions.

• Flanged Connection:RF (Raised Face) or RTJ (Ring-Type Joint) flanged connections are adopted in accordance with ASME B16.5, facilitating integration with existing medium-to-large bore piping systems and online maintenance.

• Fire-Safe Design:Compliant with API 607 / ISO 10497 standards. In the event of fire damage to soft seats, metal seats come into contact with the ball to form a metal-to-metal seal, preventing media leakage during fire incidents.

• Anti-Static Device:Built-in anti-static spring ensures effective discharge of static electricity between the ball, stem and valve body, preventing explosions caused by static accumulation from media flow in medium-to-large bore pipelines.

8x6"150LB A105 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.