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    Superior performance of eccentric hemispherical valve
    SendTime:2017-01-05  Views:

    1 fluid resistance is small, and its resistance coefficient is equal to the length of the pipe section.

    2 simple structure, small size, light weight.

    3 close and reliable, the current ball valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.

    4 easy operation, open and close rapidly, from fully open to fully closed as long as 90 degree rotation, facilitate remote control.

    5 easy maintenance, ball valve structure is simple, seals are generally active, disassembly and replacement are more convenient.

    6 in the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, the medium through, will not cause erosion of the valve sealing surface.

    7 a wide range of applications, from small to a few millimeters in diameter, up to a few meters from the high vacuum high pressure can be applied.

    Gaoping billiards valve position according to their channels can be divided into straight through three and right angle type. After the two ball valve for the distribution of media and change the flow of media. Three piece ball

    1 to leave the valve handle rotation position.

    Valve installation and maintenance should pay attention to the following matters:

    2 cannot be used as a throttle.

    3 ball valve with transmission mechanism should be installed upright.

    Two, eccentric hemisphere valve works:

    By rotating the valve chain to make the valve flow or occlusion. Valve switch light, small size, can be made large caliber, reliable sealing, simple structure, easy maintenance, sealing surface and spherical often in the closed state, the media can not easily be eroded, widely used in various industries.

    Three, eccentric hemispherical valve in the pipeline is mainly used for cutting and distribution and change the direction of the flow of media. Ball valve is widely used in recent years, a new type of valve, it has the following advantages:

    1 fluid resistance is small, and its resistance coefficient is equal to the length of the pipe section.

    2 simple structure, small size, light weight.

    3 close and reliable, the current ball valve sealing surface material widely used plastic, good sealing, in the vacuum system has also been widely used.

    4 easy operation, open and close rapidly, from fully open to fully closed as long as 90 degree rotation, facilitate remote control.

    5 easy maintenance, ball valve structure is simple, seals are generally active, disassembly and replacement are more convenient.

    6 in the fully open or fully closed, the ball and valve seat sealing surface and the dielectric isolation, the medium through, will not cause erosion of the valve sealing surface.

    7 a wide range of applications, from small to a few millimeters in diameter, up to a few meters from the high vacuum high pressure can be applied. When the ball is rotated 90 degrees, the surface of the inlet and outlet should be completely spherical, thus cutting off the flow.

    Eccentric half ball valve is a new type of ball valve, it has its own unique advantages of the structure, such as the switch without friction, seal is not easy to wear, opening and closing torque is small. This reduces the size of the actuator. Equipped with multi turn electric actuator, which can adjust the medium and cut off tightly. It is widely used in petroleum, chemical industry, urban water supply and drainage, etc.

    Four, eccentric hemisphere valve works as follows:

    A, opening process

    1 in the closed position, the ball by the stem [wiki] mechanical [/wiki] pressure, pressure on the seat.

    2 when the handwheel counterclockwise, the stem is the reverse movement, the bottom of the angular plane to disengage the ball seat.

    3 stem continues to rise, and with the stem spiral groove guide pin interaction, so that the ball began to spin without friction.

    4 until fully open position, the valve stem to the limit position, the ball to the full open position.

    B, closing process

    1 turn the handwheel clockwise when the valve is closed, the stem begins to fall and the ball begins to rotate.

    2 continue to rotate the hand wheel, the valve stem is embedded in the spiral groove on the role of the guide pin, the stem and the ball at the same time rotate 90 degrees.

    3 close, the ball has no contact with the valve seat in the case of rotation of 90 degrees.

    4 hand wheel rotation of the last few laps, the bottom of the valve stem to the angle of the plane mechanical wedge to the pressure of the ball, so that it is tightly pressed on the seat, to achieve full sealing.

    Five, the structure characteristics of eccentric hemispherical valve:

    1, open and close without friction. This feature completely solve the traditional [wiki] valve [/wiki] sealing surface due to friction between each other and affect the sealing problem.

    2, jacket type structure. The valve installed on the pipeline can be directly online inspection and maintenance, can effectively reduce the device parking, reduce costs.

    3, single seat design. The problem that the medium in the valve cavity is affected by the abnormal boost is eliminated.

    4, low torque design. Special structural design of the stem, just with a small hand can easily open and close the valve.

    5, wedge sealing structure. The valve is provided by the mechanical force of the stem, the ball wedge pressure to the valve seat and seal, so that the valve seal is not affected by the pressure difference in the pipeline, in a variety of operating conditions have a reliable guarantee of sealing performance.

    6, sealing surface self-cleaning structure. When the ball roll off the seat when the fluid in the pipeline along the sealing surface of the sphere into 360 degrees evenly through, not only eliminates the high speed fluid on the seat of local scour, also washed away the sediment on the sealing face, achieve the purpose of cleaning.


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