• F316 Forged Stainless Steel Body: Constructed from integrally die‑forged ASTM A182 F316 austenitic stainless steel with a dense grain structure and excellent low‑temperature toughness, achieving Charpy V‑notch impact energy ≥27 J at ‑196℃. Containing 2%–3% molybdenum, F316 offers significantly better resistance to chloride pitting, crevice corrosion and intergranular corrosion than 304, making it suitable for chloride‑containing low‑temperature media and marine environments.

• Oversized Reduced Bore Design (20×16 Inches): The valve has a nominal size of 20 inches (DN500) and a flow bore of 16 inches (DN400). This reduced bore design cuts valve weight by 30%–40%, operating torque by 25%–35% and manufacturing costs, while meeting flow requirements for most large‑bore low‑temperature process piping and improving economic efficiency.

• Three‑Piece Body Structure: The valve body consists of a central main body and two side bodies connected by bolts. Internal components such as the ball, seats and stem can be replaced without removing the valve from the pipeline, greatly reducing downtime and maintenance costs for low‑temperature large‑bore systems — especially ideal for continuous LNG production facilities that cannot be shut down.

• 900LB Ultra‑High Pressure Class: Class 900 (PN150) pressure rating with a maximum working pressure of 15.3 MPa at ambient temperature, satisfying severe service requirements including high‑pressure LNG export and large cryogenic pump discharge, representing a high‑pressure specification in cryogenic ball valves.

• Trunnion‑Mounted Ball: The ball is secured in body bearings via upper and lower trunnions, maintaining precise positioning under ‑196℃ low‑temperature contraction, 900LB ultra‑high differential pressure and thermal cycling conditions. This prevents ball deflection and sealing face eccentric wear seen in large‑bore floating ball valves, ensuring long‑term reliable sealing under extreme operating conditions.

• Extended Cryogenic Bonnet: The bonnet is extended above the seat to keep the packing gland area away from ‑196℃ low‑temperature media. The temperature gradient ensures packing operates above 0℃, preventing stem freezing and operational sticking. Extended dimensions comply with BS 6364 / ISO 28921‑1, with a typical length ≥800 mm for 20‑inch size.

• Optional Vacuum Insulation: Vacuum jacket or polyurethane foam insulation can be applied to the bonnet and body, reducing cold loss by over 60%, preventing external surface frosting and personnel frostbite, and improving overall system energy efficiency.

3piece Cryogenic 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.