Automatic pneumatic valve of common fault and prevention measures

fault, one of the pneumatic valve. The reasons are: (1) the control channel is sundry jam ( Channel small, easy to jam; (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 vacuum pneumatic valve must be installed before the filter; For new installations or stop using the reduced pressure pneumatic valve for a long time, be sure to disassemble and clean. Can't afford to direct fault another, pneumatic valve, decompression. The reasons are: (1) the piston at a particular location ( Not top stuck; (2) the main pneumatic valve pneumatic valve guide hole in cylinder set a handle position ( Is not a closed position stuck; (3) the lower main pneumatic valve pneumatic disc spring fracture or failure; (4) pulse pneumatic valve pneumatic valve handle pneumatic valve seat hole in a certain position ( Is not a closed position and make the piston is always affected by pressure; (5) the main pneumatic disc and the main pneumatic seat between the sealing surface, dirt stuck or Nick; 6 diaphragm failure due to fatigue or damage. For vacuum pneumatic 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 of pneumatic valve handle coarser, application of sand paper burnish. After three, pneumatic valve can not adjust pressure. 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, pneumatic valve after pressure pulse wave and unstable. This is the difference in input medium and output quantity is too big, should be to choose the pneumatic valve diameter of pneumatic valve. There is also a cause of pneumatic valve after pressure instability, adjusting spring improper selection; A nominal pressure relief pneumatic valve, adjust the spring there are a few, such as nominal pressure for kilogram per square centimeter, adjusting spring there is - Kg/cm2, - Kg/cm2, - Kg/cm2 three, if after the pneumatic valve pressure just - Kg/cm2, and spring is - Kilogram per square centimeter of that kind of, don't the pneumatic valve pressure is adjustable. , spring loaded safety pneumatic 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 pneumatic valve spring type safety, there are several pressure, pressure of each section has a corresponding spring. Such as nominal pressure pneumatic valve for kg/cm2 safety, working pressure is. - Kg/cm2 pressure section, installed - Kilogram per square centimeter of the spring, although also can make open, but the high and low, is not very sensitive. 。 。 Pneumatic valve or check pneumatic non-return valve common faults are: (1) pneumatic disc break; (2) medium. The causes of pneumatic valve broken is: medium pressure before and after the check pneumatic valve in close to equilibrium and 'see-saw' state of each other, often with pneumatic pneumatic valve seat valve flap, some brittle material ( Such as cast iron, brass made of pneumatic disc was broken. Prevention method is to adopt pneumatic disc check pneumatic valve 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 pneumatic valve failure, the most fundamental one is familiar with its structure, material and movement theory.