Flat gate valve according to the drive mode can be divided into manual flat gate valve, pneumatic flat gate valve and electric flat gate valve. According to the purpose and use of the occasion can be divided into flat gate valve with flow guide hole, without diversion hole plate gate valve, oil field flat gate Industrial Valves, flat gate valve and gas pipe line, flat gate valve and so on. Gate Industrial Valves cannot open the failure condition of gate valves can be installed in horizontal or vertical pipe lines, single and double disc gate valves should be installed in a horizontal pipeline, and the hand wheel shall be located above the valve, don't allow the install. Gate valves flow direction of medium is not restricted. Gate valves particularity common failure analysis is as follows: 1, T slot rupture ( The casting processing or unqualified) 2, 3 gate is jammed, the screw nut is corrosion failure after 4, close the Industrial Valves stem heated top 1, open die no more than 2 top dead center, closing force properly, are not allowed to use the long lever 3, according to the medium correct selection of 4, corresponding unloading rules applied to the top to prevent heat die fracture (5, T slot More than top dead center, still vigorously open twist operation)
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