Pneumatic diaphragm pump structure are similar, so the problems are similar. Pneumatic diaphragm pumps are now more widely used to be accepted by the public. In many companies such as chemical industry, spraying, ceramics and other factories have many diaphragm pumps. Diaphragm pump can be broadly divided into two categories, one is the electric diaphragm pump, one is the pneumatic diaphragm pump. And pneumatic diaphragm pump is applied most. So here I am going to talk about the maintenance of pneumatic diaphragm pump experience. Hope that the majority of equipment maintenance staff helpful. And I hope this article will play a valuable role. Let everyone come together to explore together to improve. common problem: First, the pump can not start how to repair: 1, is a serious valve spool wear and tear. 2, is the shaft sleeve wear. At this point should be replaced copper sleeve. 3, is the shaft screw down at both ends. 4, two layers of diaphragm are broken. 5, is the diaphragm pump upside down or flat. Spool can not be reversed (first and second generation) Second, the flow is too low How to repair: 1, the import and export one-way valve (plastic ball) wear smaller. Or a bar, large particles stuck plastic ball. As a result, when the material is discharged from the material discharge port, the liquid material is recharged again and the materials are pressed back from the material supply port. 2, Diaphragm is the usual tensile deformation, resulting in smaller volume of the material chamber. Third, black, thick layer of membrane damage. Axis driven not go in place. Third, the pump moves slowly, pumping speed slow How to repair: 1, the gas pressure is reduced. Take a look at the pressure of the inlet pressure gauge, the pressure value of 4 to 7 kg for normal. Then check the position of the gas valve opening, such as the gas source is opened and closed solenoid valve, then check the solenoid valve plastic valve is damaged, resulting in plastic valve can not be fully open. 2, the muffler is blocked, the gas can not be quickly discharged, resulting in a slow pumping speed. 3, compressed air is too much water or impurities. Into the diaphragm pump valve blockage after the intake, or stuck with valve. Fourth, with the upper and lower end caps with valve due to the impact of the valve spool often lead to damaged valve cover leakage. Five is the pump inner four ring seal wear and tear. Fourth, the material inside the impurities or oil how to repair: 1, cleaning impurities or oil 2, this is generally caused by rupture of the diaphragm. Fifth, how to repair the leakage of imports and exports: 1, the screw is not fastened 2, ball seat deformation or O-ring damage 3, both ends of the pump casing is not tilted on the hole, resulting in two discharge port or feed port is not in the same plane Six, export liquid contains a lot of bubbles 1, please check the diaphragm is broken. 2, check whether the pump body and pipeline leak. Pneumatic diaphragm pump is a compressed air-powered, through the diaphragm reciprocating deformation volume changes caused by the volume of the pump, the working principle is similar to the piston pump. The use of pneumatic diaphragm pump operation should pay attention to the following points: 1, to ensure that the maximum particles contained in the fluid does not exceed the maximum safety diaphragm through the particle diameter standard. 2, the intake pressure Do not exceed the maximum allowable pressure pump, compressed air above the rated pressure may result in personal injury and property damage and damage the performance of the pump. 3, to ensure that the diaphragm pump pressure system can withstand the highest output pressure to ensure that the drive air system clean and normal working conditions. 4, sparks may cause explosion caused by personal injury and property damage, as needed, use a large cross-sectional area of ​​the wire, the diaphragm pump grounding screw properly and reliably grounded. 5, grounding requirements in line with local laws and regulations and site requirements of some special requirements. 6, fasten the diaphragm pump and the connecting pipe joints to prevent electrostatic sparks due to vibration impact. Use antistatic hose. 7, to periodically check and test the reliability of the grounding system, grounding resistance requirements of less than 100 ohms. 8, to maintain good exhaust and ventilation, away from flammable and heat sources. 9, the pump exhaust may contain solids, do not face the work area or exhaust port, so as to avoid personal injury. 10, when the diaphragm failure, the delivery of materials from the exhaust muffler squirting. 11, When transporting flammable and toxic fluids, please connect the outlet to a safe place away from the work area. 12, Please use at least 3/8 "inner diameter smooth pipe wall outlet and muffler. 13, high pressure fluid can cause serious personal injury and property damage, please do not pump the pressure and the pump and the pipe system for any maintenance work, such as to be repaired, the first cut off the pump intake, open The bypass pressure relief mechanism depresses the piping system and slowly loosens the connected pipe connections. 14, such as the delivery of harmful toxic fluid pump, please do not send the pump directly to the manufacturer to repair. Properly handle according to local laws and regulations, and use the pure parts of Shanghai Guangzheng Valve Co., Ltd. to ensure the service life. 15, liquid delivery part of the use of aluminum alloy pump, please do not use for the delivery of liquid containing Fe3 + and halogenated hydrocarbons and other halogenated hydrocarbon solvents, it will produce corrosion caused by burst pump. 16, to ensure that all operators are familiar with the operation and use of pump safety precautions, if necessary, rationing necessary protective equipment. 17, to ensure that all contact with the transport body parts will not be transported corrosive fluid damage. 18, the correct diaphragm pump, do not allow long-term air operations. Dead pump how to repair: 1. Gas source is not gas, or air inlet leaks. Disconnect the tubing from the pump connection and repair Fuxu Coating provided 2. Pump at the dead point (a few pumps, rarely appear). Open the main valve, push the valve spool to one end by hand, and reassemble it. 3. The main gaskets pad back (due to SKYLINK 1 inch pump SANDPIPER 1 to 3 inch pump main gaskets are positive and negative). Open the main valve, reassemble the gasket, pay attention to the hole can be relative 4. The main valve spool wear serious, leak. 5. Gas source is dirty, debris blocked pilot valve vent. Clean or replace the pilot valve. 6. Due to debris into the stuck main valve spool. Replace the valve sleeve. 7 pilot valve seal wear serious, leak. Change the seal. 8. U-seal pump shaft damage is serious, leak. Change the U-ring. Fu Xu paint provided. 9. silencer blocked, the pressure can not form the middle of the body. Remove muffler pump can work properly. Replace the new silencer. 10. Thimble seal damage, thimble seat wear serious thimble bending thimble problems. replace. 11 intermediate corrosion serious holes leak. Replace the intermediate. Diaphragm rupture or platen loose leakage, leakage. Replace the damaged parts, the pressure plate. 13. Valves, pilot valves, gas cap gasket damage leak. Replace the damaged gasket. 14. Pump cavity material dry. Open the cavity clean.