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They are set up in pipelines as isolating valves

  • Gate valves are widespread for all kinds of applications and so are suitable for both above-ground and underground installation view more. Not least for underground installations, it truly is paramount to find the right style of valve to stop high replacement costs.

    Gate valves are equipped for fully open or fully closed service. They are placed in pipelines as isolating valves, and may not be used like a control or regulating valves.Operation of an gate valve is finished doing an either clockwise to seal (CTC) or clockwise to look at (CTO) rotating motion with the stem. When operating the valve stem, the gate moves up- or downwards within the threaded part from the stem.

    The sorts of gate valves may be divided into wedge disc gate valves and parallel disc gate valves based on the sealing surface configuration. Wedge disc gate valves might be further split into: single gate, double disc and elastic disc; parallel disc gate valves might be Divided into single disc type and double disc type. According to the thread position with the valve stem, it may be divided into rising-stem gate valve and non rising-stem gate valve.

    Installation and repair off rising-stem gate valve:
    Handwheels, handles and transmission mechanisms will not be allowed to be utilized for lifting, and collisions are strictly prohibited.The double disc gate valve must be installed vertically (which is, the valve stem is within the vertical position plus the handwheel is in the top).The gate valve using a bypass valve needs to be opened before opening (to balance pressure difference between the inlet and outlet minimizing the opening force).The gate valve with transmission mechanism must be installed in accordance with the product manual.

    As the gate or wedge must travel through the entire cross-section from the valve bore, the entire height of gate valve is larger than the ball valve that is a quarter turn valve and require vertical movement on the stem.

    Gate valves are offered with renewable seats that are usually tough to change out in-situ.
    The valve flow characteristics of gate valve could potentially cause high velocity of flow that occur for longer duration as the opening or closing the valve as a result of slow movement of wedge or gate ball valve . High velocities could cause erosion of seat and also the disc thereby decreasing the design life on the valve. This condition is usually referred to as “wire drawing” effect.