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. Leakage under the pressure equipment to work normally, 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 Industrial Valves 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 jump frequency or vibration 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. The open pressure are not the cause of this situation is the constant pressure are inaccurate. 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 not return mainly spring bending stem, valve installation position is not straight, or stuck. Should be reassembled. 5. After the exhaust pressure continues to rise mainly because the use of the relief valve discharge xiaoping equipment safety relief measures, 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 Industrial Valves 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 mainly constant pressure not less than stipulated pressure; Spring aging elastic decline. Should be appropriate tightening the adjustment screw or replace the spring.
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