Gate valve with its pressure, heat resistance, High and low temperature) , corrosion resistance, A variety of material configuration) , have two-way sealing function, wear resistance, and the advantages of long service life is more and more widely used in all kinds of industrial system, open and closed, the medium for the system's stability and control play an important role. Gate valve stem fracture stem fracture usually occurred in the thread root, the minimum sectional area and is easy to appear stress concentration and the phenomenon of excessive. Especially when working conditions significantly deviate from the design parameters. As has repeatedly occurred in one power plant stem after 6 electric gate valve open ladder type screw thread relief groove snap accident. The survey found that the valve bonnet nut loose, cover up, stem nut jammed, obviously this is a debug denso trip, protect too much torque caused by the accident. Another type of valve stem fracture accident happened in open moment. Show the ram is not out of the seat, the valve stem is under or on the thread root fracture. The reason for this is usually attributed to ram gets stuck, this is just part of the reason or secondary causes. One important reason is that following the closure of the valve body lumen abnormal booster, when the Industrial Valves is turned off, closed between upstream and downstream sides sealing surface midplane fluid pressure is much higher than the upstream pressure. There are two reasons for this phenomenon. One lumen fluid heated by upstream fluid heating expansion, result in higher pressure drastically. A second gate closing moments fluid sealed in the lumen, unable to drain, lumen space was further squeeze stem, due to the compressibility of the liquid is very limited, also can make pressure surge, this phenomenon is especially easy to occur in power plant Z962 class main feed gate valves. At the same time, the abnormal pressure in general will increase in geometric series, far more than the stem strength design limit. Gate Industrial Valves stem stem bending generally appear in denso debugging is not at the time of electric Industrial Valves, such as closing torque too big and not set trip protection or disorders, such as the damage to the valve is very big. In this paper, the keyword search: more technical articles valve product supply information
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