• Two-Piece Carbon Steel Body: The valve body consists of a main body and a side body with a simple and compact bolted connection. Cast or forged construction is available. Made of A216 WCB / A105 carbon steel, it is economical and practical, with mechanical strength meeting medium-pressure service requirements.

• Top Entry Design: Internal components including the ball, seats and stem can be disassembled and replaced from the top of the valve body without removing the valve from the pipeline, greatly reducing maintenance downtime and repair costs.

• Trunnion-Mounted Ball: The ball is fixed in the body bearings by upper and lower trunnions, maintaining precise positioning under differential pressure conditions and eliminating ball migration encountered in floating ball valves. The sealing surfaces are evenly loaded, making it suitable for medium differential pressure and frequent operation applications.

• 300LB Medium-Pressure Class: Class 300 (PN50) pressure rating with a maximum working pressure of 5.0 MPa at ambient temperature, suitable for medium-pressure steam, oil, gas and chemical process piping systems.

• ANSI Standard Flanged Connection: RF (Raised Face) or RTJ (Ring Type Joint) flanged ends are adopted, complying with ASME B16.5, facilitating integration with North American and global ANSI standard piping systems.

• Double-Seat Bi-Directional Sealing: Independent upstream and downstream seats provide bi-directional sealing with unrestricted installation orientation. Soft or metal seats are available to suit various media and temperature conditions.

• Fire-Safe Design: Compliant with API 607 standard. In case of fire damage to soft seats, metal seats contact the ball to form a metallic seal, preventing media leakage during fire incidents.

• Anti-Static Device: Built-in anti-static spring ensures effective static discharge between the ball, stem and valve body, preventing 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.