properties and application of the cut-off valve, the main results were as follows: ( 1) Simple structure than gate valves, manufacturing and maintenance more convenient. ( 2) Sealing surface is not easy to wear and tear, sealed performance is good. When the valve opening and closing, there is no relative sliding between the disc and body sealing surface, wear and scratches not serious, good sealing performance, long service life. ( 3) When the valve is opened and closed, the disc stroke is small, so the height of the cut-off valve is less than the height of the gate, but the length of the structure is greater than the length of the structure of gate valve. ( 4) The opening and closing torque, opening and closing time, is the main opening and closing time. ( 5) Body medium channel bend, resistance, power consumption is big, big resistance. ( 6) Medium flow direction when the nominal pressure PN 16 MPa or less, the medium flow upstream from the footwall direction, when nominal pressure PN acuity 20 MPa, usually adopt reflux, medium flows down from the top disc, the energy increases the seal. When using, the ball valve medium flows in one direction only, can't change the direction of flow. ( 7) When the disc completely open, tend to erosion. Globe valve is only applicable to full open and close, are not allowed to adjust and throttling. Globe valve has the following advantages: 1. Simple structure, convenient manufacturing and maintenance. 2. Working time is little, opening and closing time is short. 3. Sealing performance is good, sealing surface friction small, long service life.

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In various different types of cast iron gate valve, resilient gate valve flow control valve is one of the most commonly used.