Spring is on the exhaust pipe due to wrong operation or unwashed blocked and set up the device. The relief Industrial Valves spring is restricted to exhaust pressure cooker in safety pressure scope, ensure the safe use of devices. Spring of the structure, performance is the key to this valve. In accordance with the valve disc to open the biggest height and diameter of the relief valve flow ratios, spring safety valve and can be divided into micro rev closed high pressure safety valve spring and spring and all safety Industrial Valves two kinds. 1. Spring micro rev enclosed micro high pressure relief valve and safety valve opening height less than a quarter, the diameter of the flow channel is usually 1/40 a 1/20 the diameter of the runner. Raise safety valve movement process is proportional action, it is mainly used for liquid occasions, sometimes also used in the gas situation of emissions is small. 2. Spring full rev safety valve full rev safety valve opening height is greater than or equal to the runner diameter of a quarter. Rev. All safety valve discharge valve seat throat is the size of minimum cross-sectional area. Its action process is to belong to two acting, must use a lifting mechanism to achieve full open, full and safety valve is mainly used in the occasion of gas medium. 3. Rev. Safety valve in the opening height between micro and type with qi type. Made two paragraphs, which can be also used as the proportional action type. Spring loaded safety valve common faults and eliminate method ( 1) After discharge disc does not return. Mainly spring bending the valve stem, valve installation position is not straight, or stuck. Should be reassembled. ( 2) 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. ( 3) 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 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. 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) 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) 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.
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