Boiler safety valve to valve malfunction solution


From:Shandong Huayuan boiler Co., Ltd. Release Date:2012/5/24 Statistics:2699

Boiler safety valve valve leakage, the valve body with surface leakage impulse safety valve the emperor safety valve action, impulse safety valve back seat emperor safety valve to delay the back seat for too long, and safety valve, low pressure back seatfrequency jump and flutter common cause of the malfunction, and a solution for the cause of the malfunction. Abstract: The boiler safety valve valve leakage, the valve body with surface leakage impulse safety valve the emperor safety valve does not act, the impulse relief valve back seat emperor safety valve delay back seat for too long and the back seat of a safety valve pressure is low, the frequency jump and flutter common cause of the malfunction, and a solution for the cause of the malfunction.

Foreword safety valve is a very important protection valve, widely used in a variety of pressure vessels and piping systems, compression system pressure exceeds the set value, it can automatically open, the excess medium emitted into the atmosphere in order to ensure the safe operation of pressure vessels and piping systems, to prevent accidents, but can automatically shut down when the pressure in the system back down to the work pressure or slightly lower than the working pressure. Reliable safety valve work is directly related to equipment and personal security, and so must be given attention. 2, the safety valve common cause of failure analysis and solutions

2.1, valve leakage in the device to work under pressure, the valves and valve seat sealing surface exceeds the allowable degree of leakage, the safety valve leakage will not only cause the dielectric loss. In addition, the media continues to leak will make the hard seal material destruction, however, the safety valve sealing surface are metallic materials of metal materials, although strive to do is smooth, but in the case of media pressure is very difficult to absolutely no leakage. Therefore, the working medium is steam safety valve in the value of the specified pressure, if at the exit of the naked eye can not see, not hear there is leakage, the sealing performance is qualified. Generally caused by valve leakage because of the following three cases: In one case, dirt impurities fell on the sealing surface of the sealing surface of the pad to live, cause there is a gap between the spool and the valve seat to valve leakage. To eliminate this failure is to remove dirt and impurities fall to the sealing surface, usually prepared in the boiler shutdown size of the repair, the first thing to do security door run ram test, if you find leakage shutdown after the disintegration of the overhaul, if it is The point of the furnace after running ram test security gate leakage, it is estimated that this is the case, can be in the running of the mound to cool for 20 minutes and then run the rudder once the erosion of the sealing surface. Another case is the damage of the sealing surface. The main reason for the sealing surface damage are the following: First, poor sealing surface material. The second is the maintenance of poor quality, the valve seat grinding up less than quality standards, to eliminate this failure to repair the sealing surface according to the degree of injury after grinding by grinding or turning. Another reason is safety valve leakage due to improper assembly or the relevant parts of the wrong size. Valve seat is not in the assembly process or a combination of surface light transmission phenomenon, or the valve seat sealing surface is too broad and not conducive to seal. Elimination method is to check the spool around with the size and uniformity of the gap to ensure the spool top hole and seal the surface Far, check the gap ministries is not allowed to lift the spool; drawings appropriate to reduce the width of the sealing surface to achieve an effective seal

 

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