Stainless steel security pneumatic valve common fault reason analysis

security pneumatic valve is a kind of very important protection with pneumatic valve, widely used in all kinds of pressure vessels and piping systems, when the pressure in the system pressure than specified value, it can automatically open, the medium of excess emissions into the atmosphere, in order to assure the safe operation of the pressure vessel and pipeline system, prevent the happening of the accident, and when the pressure in the system is back to work stress or slightly below the work pressure can automatically shut down again. Safe reliable pneumatic valve work or not directly related to the equipment and personal safety, so must give attention. Pneumatic valve, safe common failure analysis and solution.

pneumatic valve leakage under the pressure equipment to work normally, and pneumatic pneumatic valve seat valve sealing surface occurred more than allow degree of leakage, the safety of the pneumatic valve leakage not only causes loss of medium. In addition, the dielectric constant leakage will cause the hard sealing material damage, however, the safety of commonly used pneumatic valve sealing surface is metal to metal material, while trying to do is bright and clean level off, but in the medium with pressure circumstances do not leak is also very difficult. Therefore, for the safety of the working medium is steam pneumatic valve, under prescribed pressure value, if the outlet invisible to the naked eye, also don't recognize have leakage, thought that the sealing performance is qualified.

the general causes of pneumatic valve leakage mainly has the following three conditions: one is that dirt on sealing surface impurities, the sealing surface mat, pneumatic valve core and there are gaps between pneumatic valve seat, and pneumatic valve leakage. Method of eliminating the fault is cleared dropped a seal surface dirt and impurities, general big improvements in boiler for boiler stop, first do exit lead test run, if leakage is found after the furnace to overhaul the, if is the furnace after the leakage found in testing the run lead the security, estimation is caused by this kind of situation, can be in running tuo cooling minutes after rudder, scour on sealing surface. Another case is the sealing surface damage. The main reason for the sealing surface damage has the following points: one is the bad sealing surface material. In boiler no. ~ the main exit, for example, due to the maintenance for many years, the main exit pneumatic valve core and valve seat sealing surface has developed very generally low, and make the sealing surface hardness also greatly reduced, thus cause the loss of sealing performance, the best way to eliminate this phenomenon is the original seal face turning down, then according to the drawing requirements to welding processing, improve the surface of the sealing surface hardness. Note must ensure the quality of processing, in the process of machining, defects such as cracks on sealing surface, trachoma, must be reprocessed after turning it down. The new processing of pneumatic valve core seat must conform to the requirements of the drawings. Currently using YST general steel electrode welding processing of pneumatic valve core sealing surface effect is good

second, poor quality of maintenance, pneumatic valve core seat grinding can not meet the quality standard requirement, method of eliminating the fault according to the damage degree is taking a sealing surface grinding or turning after grinding repair methods. Another cause of the safety of pneumatic valve leakage is due to improper assembly or related parts size is not appropriate. Pneumatic valve core in the process of assembling pneumatic seat not entirely on or in combination with surface phenomenon of pervious to light, or the pneumatic valve core pneumatic valve seat sealing surface is too wide for seal. Elimination method is to check the size of the pneumatic fitting clearance around the valve core and the uniformity, the pneumatic valve core hole top with sealing surface is degrees, check each gap are not allowed to lift the pneumatic valve core. Appropriately reduce the width of the sealing surface according to your drawings to realize effective seal.