Flat gate valve by driving can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve. According to the purpose and use occasions can be divided into a diversion orifice plate gate valve, no diversion orifice plate gate valve, oil field plate gate valve, pipeline flat gate valve and gas flat gate valve. Gate valve can not open the fault condition Introduction Gate valve can be installed in the horizontal pipe or vertical pipe, single and double gate valve should be installed in the horizontal pipe, and the hand wheel should be located above the valve, not allowed to install down. Gate valve medium flow direction is not limited. Gate valve common fault analysis is as follows: 1, T-slot fracture (casting or machining failure) 2, the gate stuck 3, the internal screw nut corrosion failure 4, the valve stem is closed after the top heat 1, allowed to open more than Upper dead point 2, closing force appropriate, not allowed to use long levers 3, the correct selection of media 4, the operation of the corresponding unloading provisions to prevent heat top 5, T-slot fracture (over the top dead center, still vigorously Open operation
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