Installation and debugging of pressure reducing valve

1. Installation and debugging 1. Before installing the pressure reducing valve, check whether the nameplate certificate matches the required valve, and whether the appearance is seriously damaged. Fully flush the pipeline and flush the pressure reducing valve. If the pressure reducing valve is stored for a long time, the inside of the pressure reducing valve should be fully cleaned. 2. If the valve itself does not have a pressure gauge, a pipeline pressure gauge should be installed before and after the valve. 3. In order not to affect the use effect of pressure reducing, and considering the convenience of installation and maintenance, the general pressure reducing valve should be installed on the horizontal pipeline, and the bellows type pressure reducing valve should be installed upside down. 4. Before installation, you must pay attention to the direction of the arrow on the valve body. The arrow points to the direction of the flow of the medium. It cannot be installed reversely. If the medium contains impurities, it may block the valve hole. A pipeline filter must be installed about 1 meter before the inlet of the pressure reducing valve. , the filter mesh number above 20 mesh is the best. 5. In order to prevent accidents caused by overpressure behind the valve, a safety relief valve should be installed 4 meters from the outlet end of the relief valve. Second, common faults and maintenance methods 1. The medium cannot pass or the throughput is very small. In this case, the channel is generally blocked, and the dirt in the channel can be removed. 2. Pass through. a. Piston stuck. Method: Remove the dirt between the cylinder liner and the piston. b. The main and pilot valve stems are stuck in the pilot holes. Method: Grind the main and pilot valve stems with gauze paper to a small outer diameter. c. The sealing surfaces of the main and pilot valves are stuck with dirt. Method: Remove dirt. d. Diaphragm damage. Method: replace the new diaphragm. 3. The pressure cannot be adjusted. a. The clearance between the cylinder liner and the piston is too large. Method: Replace the cylinder liner or piston. b. The adjustment spring is strained or the adjustment range exceeds the upper and lower limit values ​​of the spring. Method: Replace with new or suitable spring. 4. The pressure behind the valve is unstable. a. The inlet pressure fluctuation range is too large. Method: try to keep the inlet pressure fluctuating within a small range. b. The difference between the required flow and the actual flow is too large. Method: Recalculate the flow rate and select a suitable caliber.
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