• CF8 Stainless Steel Valve Body: Precision-cast from ASTM A351 CF8 (304) austenitic stainless steel, featuring excellent resistance to general corrosion and intergranular corrosion, high surface finish, meeting general hygienic requirements. Suitable for water, steam, petroleum products and various chemical media.

• Double-acting Type: Driven by compressed air for opening and closing, with high torque and fast action, ideal for frequent operation applications.

• Spring-return Type: Automatically resets upon air failure (normally open or normally closed), suitable for safety shut-off and emergency isolation.

• Air Supply Requirement: 0.4–0.7 MPa clean compressed air, equipped with filter regulator.

• Ingress Protection: IP67/IP68, suitable for outdoor and harsh environments.

• DN50 Standard Bore: Nominal diameter 50mm (2"), designed for medium-flow fluid delivery. Full port design provides extremely low flow resistance; reduced bore is available for optimized cost efficiency. Especially suitable for laboratories, skid-mounted equipment, small production lines and space-restricted installations.

• PN16 Pressure Class: PN16 pressure rating in accordance with DIN EN 1092-1, with a maximum working pressure of 1.6 MPa at ambient temperature, suitable for general industrial media such as water, oil and gas.

• Floating Ball Design: The ball floats freely under medium pressure and seals tightly against the downstream seat for reliable shut-off. Simple structure, quick opening and closing, low operating torque, ideal for PN16 low-pressure service.

• European Standard Flanged Connection: Adopts DIN EN 1092-1 Type 11 B1 (raised face) flanged ends, fully compatible with European and global DIN-standard piping systems, ensuring high installation interchangeability.

• Bi-directional Sealing Design: Independent upstream and downstream seats provide bi-directional sealing with no installation direction limitation, simplifying piping design and on-site construction.

DN50 PN18 CF8 Pneumatic Floating 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.