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  • What is the structural design features of trunnion mounted ball valve?

     
    Design features of trunnion mounted ball valve
     
    Urgent grease injection device  trunnion mounted ball valves
     
            According to customers' requirement, the trunnion mounted ball valves made by QILONG company are provided with devices for urgent grease injection, which are on both the stem and seat for the trunnion mounted ball valves of DiN>150mm(NPS6), and in the body cavity for the valve of DN<125mm. When the O-ring of stem ol the body seat ring is damaged due to accident, the medium leakage between body and stem can be prevented by injecting the sealing grease through the device.
    sealing grease injection device trunnion type mounted ball valves

    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
    double block and bleed functions ball valves

    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.
    frie safe design of seat trunnion type mounted ball valves
    fire safer design trunnion type mounted ball valves
    fire safe design of stem trunnion mounted ball vlaves

    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.
    self relief in body cavity trunnion ball valves

     

    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.
    trunnion ball valves

            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.
    blow out proof stem

    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.
    anti static design trunnion ball valves

    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.

     

     

     

     
  • What are the structural characteristics of floating ball valve

     Reliable seat seal floating ball valves

     

            The structure design of elastic sealing ring has beeen adopted for floating ball valves. This seat design features a bigger sealing pressure ratio between thering surface and the ball when medium pressure gets lower, where the contacting area is smaller. Thus, the reliable seal is ensured. When the medium pressure gets higher, the contacting area between seat ring and ball becomes bigger as the Ball sealing ring transforms elastically to undertake the bigger force pushed by the medium without any damage.
    FLOATING RESILIENT SEATED
     

    Fire safe design floating ball valves

     

            With the valve heated in a fire application, the non--metal material parts such as seat sealing ring of PTFE, stem back seat gasket, gland packing, and ithe sealing gasket between body and bonnet might disintegrate or be damaged due to high temperature.J-VALVES's specially designed structure of auxiliary metal to metal seal is provided to effectively preventboth internal and external Ball leakage of the valve. As required by customers, J-VALVES's floating ball vallves with fire safe design can meet the requirement of API607,API 6FA,BS 6755 and JB/T 6899.
    fire safe floating ball valves

     

    Reliable stem seal floating ball valves

     

            The blow-out proof design has been adopted forthe stem to ensure that even if the pressure in the body cavity is risen accidently and the packing flange becomes invalid, the stem may,not be blown out by medium. The stem features the design with a back seat, being assembled from underneath. The sealing force against the backseat gets higher as the medium pressure becomes higher. So the reliable seal of the stem can be assured under variable medium pressure.
    blow out proof sesign of stem floating ball valves
     

            V type packing structure has been employed to efffectively transform the pushing force of the gland flange and the medium pressure into the sealing force against the stem.

    V type packing structure of stem floating ball vlaves

            The traditional packing flange design has been imoroved to be two-piece structure,i.e.,being as a gland flange and gland, the latter contacts the glarnd flange with spherical surface. Thus, the gland remains vertical always, and is lined internally with a PTFE bush to prevent the galling against and friction between the stem, which can also reduce the operation torque of the valve.

    stem galling prevented in application

           Based on customers' requirement, a packing tightening design may be employed to obtain more reliable stem packing seal, which is loaded by beveling spring.

    packing tightening design loaded by beveling

     

    Anti-staticfeature floating ball valves

     

          The traditional packing flange design has been imoroved to be of two piece structure, i.e., being as a packing flange plate and a follower, the latter contacts the flange plate with spherical surface. Thus, the follower remains vertical always, and is lined internallywith a PTFE bush to prevent the galling against and friction between the stem, which can also reduce the operation torque of the valve.
    anti static design floating ball valves
     

    Wrong operation prevention

     

            To prevent the ball valve from wrong operation, the key lock with 90 of open and close positioning pad has been provided, which can be lockable as required. At the stem head, where the lever fixes, a flat is so designed fhat the valve opens with the lever in parallelto piping, and with the lever right-angled to the piping, the valve is closed. So, it is ensured that the valve indicator of open and close can never make mistake.

    with locking floating ball valves

     

Manufacturer and supplier of industrial valves, including Floating Ball Valves, Trunnion Ball Valves, Flanged Gate Valves, Welded Gate Valves, High Pressure Gate Valves, Globe Valves, Swing Check Valves, Double Disc Wafer Check Valves, Y Strainers , etc. For more information, please send us your email .

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