• F51 Duplex Stainless Steel Body:Constructed from integrally die-forged ASTM A182 F51 (2205) duplex stainless steel with austenitic-ferritic dual-phase microstructure, combining excellent toughness and high strength. Its resistance to chloride-induced stress corrosion cracking (SCC) far exceeds that of 316 stainless steel, with a pitting resistance equivalent number (PREN) ≥ 35, making it suitable for seawater, chloride-containing media and high-pressure corrosive environments.

• Reduced Bore Design (0.75" × 0.5"):The valve has a nominal size of 0.75" (DN20) and a flow bore of 0.5" (DN15). This reduced bore design reduces valve weight by 20%–30%, operating torque by 15%–25% and manufacturing costs, while meeting flow requirements for most high-pressure small-bore process piping and improving economic efficiency.

• 600LB High Pressure Class:Class 600 (PN100) pressure rating, with a maximum working pressure of 10.0 MPa at ambient temperature, suitable for severe applications including high-pressure natural gas, chemical injection and seawater systems.

• Double Block & Bleed (DBB) Function:Achieves dual-seat double sealing in a single valve, with a bleed port in the intermediate cavity, complying with API 6D Appendix H DBB requirements. It enables pipeline isolation and cavity testing without series installation of two valves, simplifying high-pressure small-bore system structure and reducing potential leakage points by more than 50%.

• Trunnion Mounting (For High Differential Pressure / Frequent Operation):The ball is precisely positioned, suitable for extreme pressure differential and frequent cycling service conditions.

• Threaded Connection:NPT (ASME B1.20.1) or BSP (ISO 7-1), facilitating quick on-site installation and replacement.

• Socket Weld (SW):Conforms to ASME B16.11, suitable for high-pressure welded piping.

• Butt Weld (BW):Conforms to ASME B16.25, suitable for permanent high-pressure systems.

F51 0.75x0.5"600LB DBB Ball Valve 3D Diagram

J-VALVESSPE can supply a range ofseat types and configurationsto meet specific process needs:

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

Seat Design	Single piston effect (SPE)	Double piston effect(DPE)-DIB 1	Combined DIB 2
Bi-directional sealing	Yes	Yes	Yes
Body-Cavity Self relieving	Yes	No	Yes
Double Barrier	No	Yes	Yes (preferred direction only)

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.