Failure is one of the valve. The reasons are: (1) the control channel is sundry jam ( Channel small, easy to plug) ; (2) piston for rust stains card at the highest position; Is the upper bearing, but can't move down, can't open the main. So, the piston pressure reducing valve must be installed before the filter; For new installations or discontinuation of the pressure reducing valve for a long time, be sure to disassemble and clean. Can't afford to direct fault another, valve, decompression. The reasons are: (1) the piston at a particular location ( Not the top) Stuck; (2) the main valve valve handle guide hole in cylinder set a location ( Not closed position) Stuck; (3) lower part of the main valve disc spring fracture or failure; (4) pulse valve handle in one seat hole position ( Not closed position) Always stuck to the piston by pressure; Between 5 main disc and the main seat sealing surface, dirt stuck or Nick; 6 diaphragm failure due to fatigue or damage. For pressure reducing valve, in particular emphasis on regular inspection. If found dirt, rust stains will remove in time; Piston ring damage should be updated; A spring failure need available; If not closed on sealing surface, should be reground; Diaphragm is ineffective to replace; Confirmed by the use, such as valve handle coarser, application of sand paper burnish. Three, the valve after pressure cannot be adjusted. In addition to the above various reasons, there are: (1) the adjusting spring failure; (2) the cap joint leakage, unable to maintain pressure. Imports of metering pump which depends on timely inspection process to prevent. In addition, there is a phenomenon, that is, after the valve pressure pulse wave and unstable. This is the difference in input medium and output quantity is too big, should choose to valve diameter of the valve. There is a cause of valve after pressure instability, adjusting spring improper selection; A nominal pressure reducing valve, adjust the spring there are a few, such as the nominal pressure of 16 kg/cm2, adjusting spring there is 1 2-3 kg/cm2, 8 kg/cm2, 7 - 11 kg/cm2 three, if only 1 - valve after pressure 3 kg/cm2, and spring is 7 11 kg/cm2, no the valve pressure is adjustable. 2, spring safety valve failure, one of the leakage of sealing surface. The reasons are: (1) between the sealing surface with sundry; (2) the sealing surface damage. This must depend on the preventive maintenance to prevent failure. The second failure, sensitivity is not high. The reasons are: (1) spring fatigue; (2) spring improper use. Spring fatigue, no doubt, should be replaced. Spring use undeserved, it is the users do not pay attention to a nominal pressure of the spring type safety valve, there are several pressure, pressure of each section has a corresponding spring. Such as nominal pressure relief valve for 16 kg/cm2, working pressure is 2. 5 - 4 kg/cm2 pressure section, 10 - installed 16 kilograms per square centimeter of the spring, although also can make open, but the high and low, is not very sensitive. 6. 2. 3 check valve or check valve common faults are: (1) the disc break; (2) medium. The cause of disc break is: medium pressure before and after the check valve in close to equilibrium and 'see-saw' state of each other, flap disc frequently with seat, some brittle material ( Such as cast iron, brass, etc. ) The disc was broken. Prevention method is to use the disc check valves for ductile materials. Medium backflow of the reasons are: (1) sealing surface damage; (2) the clip into the impurities. Repair the sealing surface and cleaning impurity, can prevent backflow. Above narration about common fault and prevention methods, only plays a role of inspiration, in practical use, will also have other trouble, to do active flexibility to prevent the happening of the Industrial Valves failure, the most fundamental one is familiar with its structure, material and movement theory.
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