Safety valve is open-close part under the action of external force in a normally closed state, when the equipment or piping within the medium pressure than specified value, through a discharge medium system to prevent the pipeline or equipment within the medium pressure in excess of the prescribed special valves. Relief Industrial Valves belong to automatic valve class, mainly for the boiler, pressure vessel and piping, control pressure shall not exceed the specified value, to protect personal safety and equipment operation plays an important role. Note the relief valve must pass through pressure test to use. Spring safety valve in the equipment under normal working pressure, occurred more than allow degree between disc and seat sealing surface leakage. The reasons are as follows: there is a dirt between disc and seat sealing surface. Can improve wrench open valve a few times, use the dirt away; The sealing surface damage. Should be used according to the damage degree, grinding or turning after grinding method to repair; Stem bending, tilt or lever to pivot deflection, the valve core and valve disc displacement. Should be repackaging or replacement; Spring elasticity decreased or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure, etc. 1. Leak: in the equipment under normal working pressure, occurred more than allow degree between disc and seat sealing surface leakage. The reasons are as follows: there is a dirt between disc and seat sealing surface. Can improve wrench open valve a few times, use the dirt away; The sealing surface damage. Should be used according to the damage degree, grinding or turning after grinding method to repair; Stem bending, tilt or lever to pivot deflection, the valve core and valve disc displacement. Should be repackaging or replacement; Spring elasticity decreased or loss of elasticity. Should be taken to replace the spring, readjust the opening pressure, etc. 2. Disc vibration or frequency jump: is mainly due to the spring stiffness is too big. Should convert the appropriate spring stiffness; Improper adjustment ring, make the back pressure is too high. Should readjust the adjusting ring position; Drain line resistance is too large, cause excessive emissions back pressure. Should reduce the discharge pipe resistance. 3. To stress are not open: the causes of this situation is a constant pressure is not allowed. Should readjust the amount of compression spring or the position of heavy hammer; Disc and seat stick. Should be conducted on a regular basis for manual vent or drain relief valve test; Lever of the relief valve lever stuck or heavy hammer has been moved. Should be to adjust heavy hammer position and make the lever movement. 4. After discharge disc don't return: this is mainly spring bending the valve stem, valve installation position is not straight, or stuck. Should be reassembled. 5. After the exhaust pressure continues to rise: spring type safety valve that is largely because of chosen displacement xiaoping equipment safety relief valve discharge volume, should be to choose a suitable safety valve; Stem midline deviation or spring rusting, the valve cannot open due to high, should be reassemble the valve stem or change the spring; The exhaust pipe section is not enough, should be taken to meet safety discharge area of the exhaust pipe. 6. Open: less than stipulated pressure spring safety valve is primarily a constant pressure are not allowed to be; Spring aging elastic decline. Should be appropriate tightening the adjustment screw or replace the spring.
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