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They are set up on pipelines as isolating valves

  • Gate valves are trusted for all sorts of applications and they are suitable for both above-ground and underground installation view more. Not least for underground installations, it really is paramount to find the right kind of valve in order to avoid high replacement costs.

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

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

    Installation and upkeep of rising-stem gate valve:
    Handwheels, handles and transmission mechanisms usually are not allowed to supply for lifting, and collisions are strictly prohibited.The double disc gate valve really should be installed vertically (that's, the valve stem influences vertical position along with the handwheel are at the top).The gate valve which has a bypass valve ought to be opened before opening (to balance the stress difference between the inlet and outlet reducing the opening force).The gate valve with transmission mechanism needs to be installed in accordance with the product manual.

    As the gate or wedge must travel over the entire cross-section from the valve bore, the complete height of gate valve is larger rather than a ball valve that is a quarter turn valve and will not require vertical movement on the stem.

    Gate valves are offered with renewable seats that happen to be usually challenging to change out in-situ.
    The valve flow characteristics of gate valve could cause high velocity of flow to take place for longer duration even though the opening or closing the valve on account of slow movement of wedge or gate ball valve . High velocities may cause erosion of seat and also the disc thereby lowering the design life on the valve. This condition can also be referred to as “wire drawing” effect.