• F316L Low-Carbon Stainless Steel Valve Body: Forged or cast from ASTM A182 F316L or A351 CF3M (316L) with carbon content ≤ 0.03%. No post-weld solution annealing is required to prevent chromium carbide precipitation, providing excellent intergranular corrosion resistance. Containing 2%–3% molybdenum, it offers significantly better resistance to chloride pitting corrosion, crevice corrosion and stress corrosion cracking than 304, making it suitable for chloride-containing media, acid-alkali-salt solutions and marine environments.

• DN300 Large-Bore Design: Nominal diameter 300mm (12") to meet large-flow medium delivery requirements. Full bore design allows smooth passage of pigs and intelligent inspection devices; reduced bore is optional for optimized cost efficiency, lower weight and reduced operating torque.

• Trunnion-Mounted Ball: The ball is secured in body bearings by upper and lower trunnions, maintaining precise positioning under differential pressure, temperature fluctuations and frequent operation. It prevents ball deflection and uneven wear of sealing surfaces common in large-bore floating ball valves, ensuring long-term reliable sealing.

• Double Seat Bi-Directional Sealing: Independent upstream and downstream seats provide bi-directional sealing with unrestricted installation orientation. Seats are available in soft seal or metal seal to accommodate various media and temperature conditions.

• Optional Flanged / Welded Ends: Flanged connections include RF (Raised Face) or RTJ (Ring-Type Joint) in accordance with DIN EN 1092-1 / ASME B16.5; butt weld (BW) ends comply with ASME B16.25, adapting to different installation requirements.

• Welding-Friendly Installation: Low-carbon F316L material avoids sensitization in the weld heat-affected zone. No post-weld heat treatment is needed, simplifying on-site installation and lowering construction costs. It is especially suitable for large-bore piping systems with welded installation.

DN300 F316L Stainless Steel Trunnion Mounted 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.