• Nickel-Aluminum Bronze Material: The valve body is cast from C95800 or C95500 nickel-aluminum bronze. Containing aluminum, iron, and nickel, it forms a dense aluminum oxide protective film. Its seawater corrosion rate is only 1/50 that of carbon steel, and its resistance to cavitation and erosion corrosion far exceeds that of stainless steel and duplex steel.

• Floating Ball Design: The ball floats freely under medium pressure and tightly contacts the downstream seat to achieve a reliable seal. Featuring a simple structure, quick opening and closing, and low flow resistance coefficient, it is suitable for medium and low-pressure applications.

• Flanged Connection: RF (Raised Face) or RTJ (Ring Type Joint) flanged connections are adopted, complying with ASME B16.5 standards, facilitating integration with existing piping systems and online maintenance.

• Enhanced Seat Sealing: Valve seats are available in RPTFE, Devlon V-API, or reinforced PEEK (Polyetheretherketone), resistant to seawater penetration and biofouling. Paired with NAB balls, they deliver bubble-tight sealing.

• Corrosion-Resistant Valve Stem: The stem is made of Monel K500 or 316 stainless steel with surface hardening treatment, offering excellent seawater corrosion resistance, high torsional strength, and prevention of galvanic corrosion.

• Anti-Static Device: Built-in anti-static spring ensures effective discharge of static electricity 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.

• Fire-Safe Design: Complies with API 607 standards. In the event of soft seat burnout, the metal seat contacts the ball to form a metallic seal, preventing medium leakage during fire hazards.

• Anti-Biofouling Property: The slow release of copper ions inhibits marine organism attachment and bacterial growth, reducing risks of marine fouling blockage and microbiologically influenced corrosion (MIC).

• Compact & Lightweight Design: Nickel-aluminum bronze has a lower density than carbon steel, reducing valve weight by 15%–20% for the same size, lowering pipeline support loads and installation costs.

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.