The gate valve several different structural performance comparison knowledge

Gate valve is the broad use of a valve in the pipeline, mainly play switched on and cut off media. Not used to adjust the flow of media, but the flow can be judged according to the level of the stem down to size (such as fire Flexible seat valve closure with headstock scale). Gate valve compared to other valves, the scope of application of pressure, temperature, caliber requirements should be broad.

    Gate valve according to the different internal structure can be divided into single-ram type: wedge, flexible gate-style, double plate, parallel ram type.

    Clear shot valve and dark rod valve stem bracket can be divided into:

    Gate valve performance advantages:

    Valve fluid resistance is small, the valve body through type, medium flow does not change direction, so compared to other valve flow resistance is smaller.

    2, the sealing performance than better shut-off valve to open and close than the cut-off valve and effort.

    3, wide application, suitable for containing granular solids and high viscosity of the medium, also apply to do a vent valve and low vacuum valve for steam, oil and other media.

    4, the gate valve having a dual-flow valve, regardless of medium flow restriction, and therefore suitable for the media may change the flow direction of the pipeline, and also easy to install.

    Gate valve performance shortcomings:

    1, the exterior design dimensions from the closed a long time. Open valve plate needs to be elevated to the upper part of the valve chamber, the closing time and need all fell on the seat of the valve plate, the opening and closing stroke of the valve plate, long time.

    2, since the two sealing surfaces of the gate valve of the valve plate and the valve seat there is friction in the opening and closing process, and therefore the sealing surface easily scratched, have an effect on the sealing performance and service life, and difficult to repair.

    Performance comparison of several different structural gate valve:

    (1) wedge single gate valve

    a more flexible structure gate valve

    b, at higher temperatures, the sealing performance is not as good flexible gate valve or a double plate valve.

    c, high temperature medium for easy coke.

    (2) elastic gate valve

    a, it is a special form of the wedge single gate valve. Wedge gate valve, high temperature, good sealing performance, can not be easily jammed ram heated;

    b, for the steam, high-temperature oil and hydrocarbon medium, and suitable for frequent site switching.
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    c, does not apply to easy media coke.

    (3) Gate Valve

    a sealing performance compared to the wedge-gate valve, when the inclination angle of the sealing surface and the valve seat is not very accurate, is still having a good sealing performance.

    gate sealing surface wear spherical top of the heart at the bottom of the metal pad replacement can be used, generally do not have the surfacing and grinding sealing surface, this is the do not have the advantage of a single gate and flexible gate.

    c, applies to the steam, high-temperature oil and hydrocarbon medium, and suitable for frequent site switching.

    d, does not apply to easy media coke.