Double-block and bleed functions trunnion mounted ball valves
In general, J-VALVES's trunnion mounted ball valve features the front ball sealing design structure. Each seat of the ball valve can separately cut off the medium at both inlet and outlet of the valve to realize double-block functions.When the ball valve is closed, body cavity and two of the body ends can be blocked with eachother even if both the inlet and outlet are under pressure, when the medium left in the body cavity might be bled through the relief valve
Fire safe design trunnion mounted ball valves
With the valve heated in a fire application, the non-metal material parts such as seat sealing ring of PTFE, O ring for the stem, and sealing gasket for body and bonnet,might be damaged due to high temperature.J-VALVES's special design of auxiliary metal to metal or the graphite seal is provided for the trunnion ball valve to effectively prevent both internal and external leakage of the valve. As required by customers,J-VALVES's fire safe design for the trunnion ball valve meets the requirement of API 607,API 6Fa,BS 675 and JB/T 6899.
Self-reliefin the body cavity trunnion mounted ball valves
As the liquid medium left in the body cavity gasgifies due to increased temperature, the pressure in the body cavity becomes abnormally higher, when the medium itself in the cavity would propel the seat and self-relieves the pressure to ensure the safety of valve.
Trumion ball valve wihte B-sealmg design stucturele
According to some special working conditions and customers' requirement, J-VALVES has provided the trunnion mounted ball. Valve withthe double-sealing design structure, i.e. seat sealing in front of the ball and seat sealing behind the ball, thus the reliable sealing of the valve is ensured because the valve can perform normally even if one of the effective sealing designs becomes lost due to the abnormal condition.
Regarding the seat in front of the ball, the piston effect formed by the area difference between D1 and D2,plus the pre-tightened force of a spring would cause the seat in front of the ball by the pressure difference of the medium before and after the valve to touch the ball closely to form the tightness, of
Regarding the seat after the ball, the piston efffect formed by the area difference between D2 and D3,plus the pretightened force of a spring would cause the seat behind the ball to touch the ball closely to form the tightness, of which the seealing force will become bigger as the pressure difference gets higher.
Blow-out proof stem trunnion mounted ball valves
Blow-out proof structure is provided with for thestem, which is positioned by the up-end cap and screw, being guaranteed not to be blown-out by the medium even if at abnormal risen pressure in the cavity.
Anti-static design trunnion mounted ball valves
The ball of the trunnion mounted ball valve gets close contact with each other through the trunnion, adjusting cushion, and down-end cap, the passage of static electricity thus forms together with the valve, which may lead the staticelectricity caused by sparks generated by friction between the ball and seat during On and off perfc rmance to the ground to prevent the possible risk of fire or explosion.
Mounting pad provided trunnion mounted ball valves
J-VALVES company has provided for trunnion mouunted ball valve with a mounting pad for fixing the actuators, such as worm gear, pneumatic, electric, hydraulic, and pneumatic & hydraulic actuators.
