Operation of metering pumps and diaphragm pumps
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:) Operation of metering pumps and diaphragm pumps 1. Startup procedure 1) Open the pump inlet/outlet valves. 2) Manually adjust the pneumatic regulator on-site to set the pump stroke to zero. 3) Start the motor. 4) Check the bearings and lubrication in all areas. 5) Manually adjust the stroke to meet the process requirements. 6) Check that the ejector pins and check valves show no jamming or leakage. 7) There are no abnormal noises such as impacts or collisions inside the cylinder. 8) Check for leaks in the sealing packing; the leakage rate should not exceed 20 drops per minute, and for metering pumps it should not be more than 3 drops per minute. There should be no leaks at the sealing surfaces of all connections. 9) The current and pump outlet pressure are stable, the check valve is functioning properly, meeting the design requirements or satisfying the production needs. 10) The lubrication and cooling systems are in good condition, with temperatures and pressures within the specified ranges; the temperature of sliding bearings should not exceed 65°C, while that of rolling bearings should not exceed 70°C. 11) Implement automatic adjustment of the controller. 2. Parking procedure: 1) Switch stroke control to manual mode. 2) Adjust it to zero stroke. 3) Stop the motor. 4) Close the inlet and outlet valves. 3. Routine maintenance: 1) Regularly check the temperature of all bearings. 2) Regularly check the pressure and temperature of each outlet valve. 3) Regularly check the lubricating oil pressure. 4) Check that all transmission components are free of looseness and abnormal noises. 5) Check the tightness of all connecting components to prevent loosening. 6) The pump shall not produce any abnormal vibration noises during normal operation; there shall be no leaks at the sealing parts, and the pressure gauge and safety valve shall function properly. :loveliness:
Thank you for sharing; I’m looking for information on this topic. .
Boss! Diaphragm pumps do not leak; otherwise we wouldn’t use them at such a high price
Operating Procedures for Diaphragm Metering Pumps 1. Preparations before startup 1. Check whether the quality and quantity of oil inside the pump meet the requirements (in the drive gearbox, it should be at the midpoint indicated by the oil level gauge; in the three-valve oil reservoirs and the diaphragm chamber, the oil level must not drop below the red indicator line)； 2. Check whether the welds on the inlet and outlet pipelines, the bolts at the connections, and the sealing surfaces are in good condition; also check whether the suction and discharge pipes of the pump are unobstructed ； 3. Before starting a pump for the first time, turn the coupling several times to ensure there is no sticking; check that the rotation direction of the motor at the control station matches that of the shut-off valve on the pump. 4. Run the pump under adaptive conditions; especially when it has been shut down for more than 5 days, it must be started from the “0” position. (For short-term shutdowns, starting from any position is acceptable.) After running without load for 5 minutes, adjust the piston stroke to the desired position before starting it under load ； 5. Pressurized operation: Close the vent valve in the oil cup of the diaphragm pump’s three valves, and gradually increase the pressure to the rated value. II. Normal Operation 1. During normal operation, the plug sealing area should not feel hot to the touch, there should be no leakage, and the oil temperature inside the transmission box must not exceed 65°C. 2. Regularly check whether the oil level and quality in the oil cups of the three valves meet the requirements, and observe whether there are any fluctuations in the oil level; if fluctuations are detected, it indicates that the valves are leaking. 3. After the safety valve has been adjusted, it is strictly prohibited to turn the adjustment screw, and it is also strictly prohibited to touch the oil filler valve ball; keep the oil in the oil cups of the three valves clean. 4. Regularly check the temperature of the feed liquid (generally ≤1000°C) and the pressure of the liquid after it passes through the pump (≤rated pressure). III. Parking and Other Matters 1. First, adjust the adjustment mechanism to the “0” position; the crankshaft stops rotating, but the motor continues to operate. When it is running, then the power is cut off, and the motor stops rotating. 2. If the pump is to be shut down for an extended period of time, the liquid inside the pump must be completely drained to prevent blockages and corrosion of the pump. 3. 20# or 30# mechanical oil is generally used in the gearbox; the oil level in the gearbox and the oil cups of the three valves should be maintained at the specified level. 4. The lubricating oil in the pump should be replaced every 6 months. When replacing it, the old oil must be completely removed; only after the tank is thoroughly cleaned should new oil be poured in. 5. Keep the exterior of the equipment clean and ensure good insulation of the motor. 6. Keep records of equipment operation, shutdown, accidents, and maintenance.
Thank you for sharing the information from floor 1 and floor 4! I learned it!
Diaphragm pumps aren’t very expensive these days, either, right? Imported ones are more expensive. But the quality is really good, huh
It is recommended to modify the title of the material to: Operation of Diaphragm Pumps, One Type of Metering Pump
I’ve learned it; now let’s talk about the applications of these two types of pumps, as well as selection criteria and so on