Common fault prevention measures, CNG pressure reducing valve, automatic valve failure, one of the valve. Especially in some impurities in more fluid transportation, most of the time the transmission fluid has certain impurities, in transport these fluid must often filter processing, so that it can be very good to avoid being blocked. 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. In the valve piston will often fail, in response to a pressure within the valve piston downward pressure, if the upper is a lot of pressure but not downward channel hard, this time will appear stuck phenomenon, appear such fault is mainly on the pistons were some rust, met a moist environment will be corrosion rust. 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. It also depends on inspection process to prevent in time. In addition, there is a phenomenon, that is, after the Industrial Valves 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 1-3 kg/cm2, 2-8 kg/cm2, 7-11 kg/cm2 three, if after the valve pressure just 1-3 kg/cm2, and spring is 7 to 11 kg/cm2, no the valve pressure is adjustable.
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