8x6 150LB A105Trunnion Mounted Ball Valve

• Forged ASTM A105 carbon steel construction: The valve body is made of forged ASTM A105 carbon steel with a dense grain structure, delivering better mechanical properties than cast valve bodies, high impact resistance and pressure strength. It is suitable for medium-low to medium-high pressure applications with cost-effective performance.

• Reduced-bore design (8×6 inches): With a nominal size of 8 inches and a flow passage bore of 6 inches, the reduced-bore design lowers valve weight, operating torque and manufacturing cost, while satisfying flow requirements for most process pipelines and improving economic efficiency.

• Trunnion-mounted structure: The ball is secured in the body bearings by upper and lower trunnions, maintaining precise positioning under differential pressure conditions and eliminating ball migration issues seen in floating ball valves. The sealing surfaces are evenly loaded, making it ideal for large-bore, high differential pressure and frequent operation scenarios.

• Double-seat sealing: Independent upstream and downstream seats provide bi-directional sealing, allowing safe pressure relief of the valve cavity and supporting DBB (Double Block & Bleed) function expansion.

• Flanged connection: RF (Raised Face) flanged connection conforming to ASME B16.5, facilitating integration with existing 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 contact the ball to form a metallic seal, preventing medium leakage.

• Anti-static device: Built-in anti-static spring ensures effective discharge of static electricity between the ball, stem and valve body, avoiding sparks caused by static accumulation.

• Blowout-proof stem design: The bottom-entry stem is equipped with an anti-blowout shoulder. Even if the packing gland is accidentally removed, the stem remains retained by the valve body, ensuring operational safety.

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.