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Application of Spring Safety Valve and Fault Analysis
Spring safety valve is for the exhaust pipe due to misoperation or unclean was clogged set up device. Spring safety valve is to limit the pressure cooker in the safe pressure range of exhaust, to ensure safe use of the device. The structure of the spring, the performance is the key to the valve. Divided according to the ratio between the maximum height of the valve flap and the diameter of the safety valve runner, the spring safety valve can be divided into two types: the spring micro-opening closed high-pressure safety valve and the spring full-opening safety valve. 1. Spring micro-Kai closed high-pressure safety valve Micro-Kai safety valve opening height is less than 1/4 of the diameter of the runner, usually the flow diameter 1/40 a 1/20. Micro-Kai-type safety valve action is proportional action type, mainly for liquid applications, and sometimes also for small emissions gas occasions. 2. Spring all-in-one safety valve All-in-one safety valve opening height greater than or equal to 1/4 of the runner diameter. The full relief valve discharge area is the smallest cross-sectional area of ​​the valve seat throat. The action process belongs to the two-stage action type, must be resorted to a lift mechanism to achieve full open, all-purpose safety valve is mainly used for gas media occasions. 3 Kai-type safety valve opening height between the micro-Kai and Kai-wide between. That can be made into two sections, can also be made into a proportional action. Spring-loaded safety valve failure and elimination of common methods (1) after the valve flap is not back seat. This is mainly the spring bent stem, the disc is not installed properly or stuck. Should be reassembled. (2) leakage. In the normal working pressure of the equipment, the valve flap and seat sealing surface occurred more than the allowable degree of leakage. The reasons are: there is dirt between the valve disc and the sealing surface of the valve seat. Use the lift wrench to open the valve a few times and rinse the dirt off; seal surface damage. Should be based on the degree of injury, grinding or turning grinding method to be repaired; stem bending, tilting or lever deflection with the fulcrum, so that the valve core and valve dislocation. Should be reassembled or replaced; spring elasticity is reduced or lost. Should take to replace the spring, re-adjust the opening pressure and other measures. (3) Do not open to the specified pressure. The reason for this situation is the pressure is not allowed. Should re-adjust the amount of spring compression or hammer position; valve flap and seat stick. The safety valve should be deflated or discharged manually on a regular basis; the lever of the lever safety valve is stuck or the weight is moved. The hammer should be readjusted and the lever should be moved freely. (4) After the exhaust pressure continues to rise. This is mainly due to the selection of safety valve discharge Xiaoping equipment safety relief should re-select the appropriate safety valve; stem neutral or spring rusty valve so that the valve can not be opened to the proper height, the valve stem should be reassembled Or replace the spring; Exhaust pipe cut enough, should be taken to meet the safety of the exhaust area of ​​the exhaust pipe. (5) Valve flap or vibration. Mainly due to the spring stiffness is too large. Should use the appropriate stiffness of the spring; adjust the adjustment circle inappropriate, so that the back seat pressure is too high. Should adjust the adjustment ring position; exhaust pipe resistance is too large, causing excessive emissions back pressure. Should reduce the discharge pipe resistance. (6) less than the prescribed pressure to open. Mainly constant pressure is not allowed; spring aging elastic decline. Tighten the adjustment screw should be appropriate or replace the spring.