The relief Industrial Valves is installed, as a result of improper use, often can cause many faults. These failures if not promptly eliminate will affect the function of safety valve and service life. The main common faults are: 1) After discharge disc not return mainly spring bending stem, valve installation position is not straight, or stuck. Should be reassembled. ( 2) 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 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. ( 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 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. ( 5) 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. ( 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. In this paper, the keyword search: relief valve
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