1. Automatic valve fault handling method
One of the faults, the valve is blocked
The reasons are as follows: 1 The control channel is blocked by debris (the channel is small and easy to block); 2 The piston is stuck in the highest position due to the rust stain; although the upper part is stressed, it cannot move downward and cannot open the main channel. Therefore, the filter must be installed before the piston pressure reducing valve; for new or long-term decompression valves, it must be opened for inspection and cleaning.
The second fault, the valve is straight through, no decompression
The reasons are as follows: 1 the piston is stuck at a certain position (not the highest position); 2 the main valve valve stem is stuck at a certain position (not the close position) of the cylinder disc guide hole; 3 the lower spring of the main valve flap is broken or invalid; 4 pulse valve valve stem is stuck at a certain position (not close contact position) in the seat hole, so that the piston is always under pressure; 5 between the main valve flap and the main valve seat, there is dirt stuck or there is Scoring; 6 diaphragm failed due to fatigue or damage. For pressure reducing valves, special emphasis should be placed on periodic inspections. If dirt and rust stains are found to be removed in time; piston ring damage should be updated; spring failure should be replaced with usable; if the sealing surface is not tight, it should be re-ground; if the diaphragm is not working properly, replace it; Thick, apply sandpaper to polish.
In the third fault, the pressure behind the valve cannot be adjusted. In addition to the above various reasons
Also: 1 adjustment spring failure; 2 cap seam leakage, can not maintain pressure. Imported metering pumps are also subject to timely inspection and prevention. In addition, there is a phenomenon that the pressure pulse after the valve fluctuates and is extremely unstable. This is because the difference between the input medium and the output medium is too large, and the valve with the same valve diameter should be re-selected. Another reason for the instability of the post-valve pressure is that the adjustment spring is not properly selected; a pressure relief valve with a nominal pressure has several types of adjustment springs, such as a nominal pressure of 16 kg/cm 2 and an adjustment spring of 1-3. Kg/cm2, 2-8 kg/cm2, 7-11 kg/cm2, if the pressure behind the valve is only 1-3 kg/cm2, and the spring is 7-11 kg/cm2. Kind, the pressure behind the valve is not adjusted.
2. One of the failures of the spring type safety valve, the sealing surface leaks.
The reasons are: 1 there is debris between the sealing surfaces; 2 the sealing surface is damaged. This type of failure is prevented by regular maintenance.
The second fault is that the sensitivity is not high.
The reasons are: 1 spring fatigue; 2 improper use of springs. Spring fatigue, no doubt should be replaced. The improper use of the spring is a spring-type safety valve that the user does not pay attention to a nominal pressure. There are several pressure sections, and each pressure section has a corresponding spring. For example, a safety valve with a nominal pressure of 16 kg/cm 2 uses a pressure of 2.5-4 kg/cm 2 and a spring of 10-16 kg/cm 2 is installed, although it can be opened, but it is high or low. Very insensitive.
Common faults of the check valve or check valve are: 1 the valve is broken; 2 the medium is reversed. The reason for causing the valve to break is: the medium pressure before and after the check valve is in a state of close to balance and "saw" with each other. The valve flap is often tapped with the valve seat, and some brittle materials (such as cast iron, brass, etc.) are made. The flap is broken. The precautionary approach is to use a valve flap as a check valve for ductile materials.
The reasons for the backflow of the medium are: 1 the sealing surface is broken; 2 the impurities are trapped. Repairing the sealing surface and cleaning impurities can prevent backflow. The above description of common faults and preventive methods can only be inspiring. In actual use, other faults will be encountered. To actively and flexibly prevent valve faults, the most fundamental one is familiar with its structure and material. And the principle of action.
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Label: Automatic valve troubleshooting method
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