the relief valve fault is the main reason of the design, manufacture, selection or improper use. These failures if not promptly eliminate, can affect the effect of valve and life expectancy, even can not ensure the safety protection. The common faults and processing methods are as follows: ( 1) Leaks. Under pressure from 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 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) To the provisions of the pressure is 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 Industrial Valves 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. ( 3) Pressure to open less than regulation. The constant pressure mainly inaccurate; Spring aging elastic decline. Should be appropriate tightening the adjustment screw or replace the spring. ( 4) After the exhaust pressure continues to rise. This is mainly because 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 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. ( 5) After discharge disc does not return. Mainly spring bending the valve stem, valve installation position is not straight, or stuck. Should be reassembled.

( 6) 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.

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