Home > PRODUCT > Trunnion Ball Valves   Seat Sealing Soft seats are standard. Seat inserts of synthetic material such as Nylon,PTFE, RTFE or Peek are contained within a metal seat ring. With no or very low line pressure, sealing between the seats and ball is achieved by seat springs. With higher line pressure, the line pressure, in conjunction with the spring load, forces the upstream seat ring against the ball, which results in tighter sealing.0-ring seat insert design is available.    Self Relieving Seat This standard feature is designed to prevent excessive pressure buildup within the valve by automatically relieving pressure when body cavity pressure exceeds the spring load on the seats. Double Piston Seat is also available to option.    Sealant Inject Fitting This feature is standard except in sizes 2"-4" for pressure classes 150,300and 500, In case of seat ring damage, sealant injection provides a fast, reliable way to restore tight sealing, This injection system can also be used for routine flushing of the seat ring area while in service.    Double Seals at all joints All connecting parts employ a double sealing design incorporating a spiral wound 316ssigraphite gasket and o-ring to ensure positive sealing. Delta ring is used optionally for class1500-2500.    Stem Sealing & Sealant Injection Fitting Two o-rings and graphite packing are used for pressure classes 150 through 600. One each of lipseal and o-ring plus graphite packing are used for pressure classes 900 through 2500, In case of damage to the o-ring lip seal, sealant injection stops leaking and restores tight sealing.   Seat Ring Sealing All connecting parts employ a double sealing design incorporating a spiral wound 316ssigraphite gasket and o-ring to ensure positive sealing. Delta ring is used optionally for class1500-2500.   Actuation JMC ® Trunnion ball valves are designed to easily install a variety of actuators including pneumatic, hydraulic, electric actuators, electro-mechanical, electro-hydraulic, vane, Hand operated valves are normally etc supplied with a lever or gear operator High-performance hydraulic actuators, which have been specialty developed for JMC® trunnion ball valves, can be supplied directly from SAMJIN JMC Further information can be received on request.    Double Block and Bleed JMC ® Trunnion ball valves provide a positive seal at both upstream and downstream independently, Since pressure on each side of the ball is blocked from the body cavity, a pressure releasing device can be used by an operator to check the integrity of the upstream and downstream seats.   Low Friction Stem/ Trunnion Bea rings and Thrust Washers Heavy duty PTFE lined carbon or stainless steel bearing and thrust washers ensure durable and low torque operation.    Other Features - Anti Static Device for Grounding - Mounting pad and Adaptability for all types of Actuator mounting - Blow-Out Proof Stem - Stem extension pieces or pups