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Pneumatic membrane regulating valve failure forms and solutions
Pneumatic membrane valve in operation, there will be a variety of process media flow through the automatic valve, including the process of raw materials, lumps, steam scouring of sediment, stones, iron filings, sheet metal, as well as instrumentation and technology installation Change the welding, gas cut into the pipe slag and so on. These foreign bodies and blocking substances, the automatic valve on the normal work and precision greater impact on the passage of time, will form a blockage, stuck. The scene generally take the following measures: 1, jam (1) cleaning method. This method is suitable for use in the process of parking inspection. Need to dismantle the regulating valve to remove dirt and foreign matter. It is noteworthy that, when dismantled, be sure to turn off the compressed air, so as to avoid unnecessary injury. Instrument seals and seals are also best replaced at the same time. (2) the use of scouring method. This method is more used in the field. When the control valve is clogged, it is usually the first to ask the chief technologist or OCC personnel if the valve can be repeatedly opened and closed, and the flow pressure of the existing process medium can be used to achieve the purpose of flushing. If the existing media and working conditions are not suitable, you can also use external steam or water under pressure to flush if the conditions are met. Flushing, pay attention to the opening of the valve control in place. (3) filter installed filter. In the process of installing filters on the pipeline is also a common measure of instrument automatic valve maintenance. In particular, the process is very important and smaller caliber control valve with this method, you can ensure that the automatic valve opening normal, stable conditions. 2, the internal leakage control valve seat into the smaller iron slag and hard objects, long-term stay can not be discharged, the valve pad, ring and valve will be subject to varying degrees of damage, affecting the ability of the leakage of the control valve. Especially for the autoclave of the high-pressure pipeline of the hydrogen production process of the reactor, a little damage or even scratches will cause internal leakage and affect safety in production. (1) grinding. Select the appropriate coarse sand and fine sand on the automatic valve pad and valve core grinding, improve the sealing surface of the valve pad and the valve smoothness and engagement. If the control valve is used in the high-pressure system, you need to pressure control valve after the test, and then normal use. (2) Enhancing the seal of the actuator. This method can ensure that the regulator valve closed tightly, sealed and reliable. Usually use the working range of moving springs, the selection of large power source of the implementing agencies and select a small stiffness of the spring to achieve. 3, leakage control valve packing is not replaced on schedule, the automatic valve locking device screws loose due to vibration, including just overhaul the control valve base screw is not tight or uneven force will cause the valve leakage. You can use the following methods: (1) replace the new filler to enhance the valve stem seal, you can also choose the seal grease to seal the stem. (2) can be properly used high-sealing metal wound gasket or PTFE packing, especially steam regulating valve, must use metal and graphite wound mats. (3) The lens pad to seal the upper and lower cover, if the valve seat and valve body seal is a flat seal, it is recommended to use a lens pad seal, the effect is significant. 4, control valve instability caused by instability control a lot of reasons, such as design selection is not reasonable, the valve diameter of the election is too small or too large; OCC process operators improper use of instruments and process parameters set unreasonable; configuration error Without debugging; process media pressure increases, flow instability, etc .; sometimes these are the result of several factors together. Often take the following specific methods: (1) select the appropriate valve diameter. If you take into account the economy and time, you can also consider the appropriate choice of variable diameter to increase or decrease the connection of the control valve and the process pipe diameter. (2) The PID value of a reasonable set, and after the actual commissioning of qualified operation, put into use. (3) to strengthen the stiffness of the control valve movement mechanism to ease the vibration of the control valve. (4) adjust the type of valve results to avoid the occurrence of resonance.