• CF8 Austenitic Stainless Steel Construction:The valve body is precision-cast from ASTM A351 CF8 (0Cr18Ni9), offering excellent resistance to atmospheric corrosion, water corrosion and weak acid-alkali media. It is non-magnetic and free from low-temperature brittleness, making it suitable for applications with high hygiene requirements.

• Two-Piece Split Design:The valve consists of a main body and bonnet, featuring a simple and compact structure with light weight and low manufacturing and assembly costs. Compared with three-piece design, it eliminates one sealing pair, resulting in fewer potential leakage points.

• Trunnion Mounted Ball Design:The ball is precisely supported and fixed by upper and lower trunnions, independent of medium pressure to load the seats. It delivers low and consistent operating torque, completely eliminating ball deformation risks for the 16-inch large bore size under Class 300 medium-low pressure.

• Double-Seat Bi-Directional Sealing:Adopts double piston effect (DPE) seats or self-relieving seat design to achieve reliable bi-directional sealing, meeting the requirements of DBB (Double Block & Bleed) functionality.

• Flanged Connection:RF (Raised Face) flanges conform to ASME B16.5, providing reliable connections under Class 300 medium-low pressure, compatible with standard piping systems for easy installation and maintenance.

• Fire-Safe Design:In compliance with API 607, in the event of PTFE/RPTFE seal burnout, a secondary metal seal is formed between the metal ball and seat ring to prevent medium leakage under fire conditions.

• Anti-Static Device:A conductive spring is installed between the stem, ball and body to ensure continuous static dissipation, suitable for flammable and explosive media such as natural gas and oil-gas mixtures.

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.