• F316 Forged Stainless Steel Body:Constructed from ASTM A182 F316 austenitic stainless steel via integral die forging, featuring a dense grain structure with mechanical strength superior to cast valve bodies. Containing 2%–3% molybdenum, F316 offers significantly better resistance to chloride pitting, crevice corrosion and intergranular corrosion than 304, making it suitable for media containing H₂S, CO₂, seawater and chemical fluids.

• Reduced Bore Design (3" × 2"):With a nominal valve size of 3" and a flow passage bore of 2", the reduced bore design cuts valve weight by 30%–40%, operating torque by 25%–35% and manufacturing costs, while meeting flow requirements for most process pipelines and improving economic efficiency.

• Double Block & Bleed (DBB) Function:A single valve achieves dual-seat double sealing with a relief port in the intermediate cavity, complying with API 6D Appendix H DBB requirements. Pipeline isolation and cavity testing are realized without dual-valve series connection, simplifying system structure and reducing potential leakage points by more than 50%.

• Trunnion-Mounted Ball:The ball is secured in the body bearings by upper and lower trunnions, maintaining precise positioning under 600LB high pressure differential conditions. It eliminates ball offset and eccentric wear of sealing surfaces common in floating ball valves, ensuring long-term reliable sealing.

• Optional Double Piston Effect Seat (DPE):DPE seat design is available to provide bi-directional double sealing, with cavity pressure supported by both upstream and downstream seats. It is ideal for high-pressure natural gas pipelines and critical isolation services requiring zero leakage.

• Optional Flanged / Welded Ends:Flanged connections in RF (Raised Face) or RTJ (Ring Type Joint) face finish, as well as butt weld (BW) ends are provided. Flanges conform to ASME B16.5, and RTJ ring grooves ensure reliable metal-to-metal sealing under high pressure.

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

• Anti-Static Device:Built-in anti-static spring ensures effective static discharge between the ball, stem and body, with electrical resistance < 10Ω, preventing explosions caused by static accumulation from high-pressure, high-velocity fluid flow.

• Blowout-Proof Stem Design:Bottom-loaded stem is equipped with a blowout-proof retaining shoulder. The stem remains secured in the body even if the packing gland is accidentally removed, guaranteeing operational safety under high-pressure conditions.

3x2 600LB F316 DBB Ball Valves 3D Diagram

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.