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The shut-off part in the gate valve is created in the form of y

  • A Gate valve is usually a linear motion on-off or shut-off valve. The gate-valve consists of a disc or wedge having two seating surfaces that will in contact with all the valve seats to make a seal for stopping the flow check here. The pressure differential between upstream flow direction and downstream side of wedge causes the wedge or disc to just make against the downstream seat creating more effective sealing within the downstream side with the wedge. Gate valve sits dormant to regulate flow as erosion of disc and seat might result in leakage. A gate valve in partially open or closed position is usually susceptible to vibration.

    The shut-off part with the gate valve is created in the form of any wedge, which may be flexible, with multiple plates or rigid.

    Let us look at each in the subcategories:
    Rigid wedge
    To ensure an increased hermiticity of gate valves, experts recommend to choose a stiff wedge. In this case, it is very important pay attention to your accuracy of wedge processing, that allows to coordinate the seat angle with all the wedge angle without obstacles. In addition to that, rigid wedge application could potentially cause dangerous events like gate jamming, or there might be problems with all the opening of gate valves in case there is temperature fluctuations, corrosion build-up or sealing damages.

    Wedge with 2 plates
    The wedge is made up of several plates that happen to be securely likely to each other and they are situated in an angle. Thanks to self-adjustment, the problem with the gate hermiticity within the closed position is usually avoided.

    Flexible wedge
    Connected with the elastic part, the plates can clamp down and help the sealing tightness in closed position. The advantage of gate valves having a flexible wedge for mounting inside pipeline is there is no need of any complex adjustment on the valve body.

    The varieties of rising-stem gate valve is usually divided into wedge disc gate valve and parallel disc gate valve in line with the sealing surface configuration. Wedge disc gate valve may be divided into: single disc type, double disc type and elastic disc type; parallel disc Type gate valve is usually divided into single disc type and double disc type. According to your thread position from the valve stem, it might be divided into rising-stem gate valve and non rising-stem gate valve.

    When the rising-stem gate valve is closed, the sealing surface are only able to rely for the medium pressure to seal, that's, only rely for the medium pressure to press the sealing surface from the disc on the valve seat for the other side to be sure the sealing on the sealing surface, that's self-sealing. Most gate valves adopt forced sealing valve, that's, if your valve is closed, the disc need to be forced towards the valve seat by external force to guarantee the tightness from the sealing surface.