Metering pump installation precautions

Common precautions for metering pump installation: 1. Exports are higher than imports, avoiding siphon phenomenon 2. The pump head and the injection valve are required to be installed vertically. 3. The attached pipe fittings can be tightened by hand, do not use tools; do not use raw tape on the thread 4. The power supply voltage is stable and grounded 5. The installation environment is clean and spacious, well-ventilated. Common faults in metering pump installation: 1) The metering pump does not absorb liquid normally. Rotate to the position of 100% of the stroke length. This allows the complete assembly to be rotated until the back plate leak drain hole is aligned with the end of the pump. Adjust the liquid end and diaphragm to the proper position while the pump is running. The pulse duration may not be long enough for reaction time. Compared to the standard pulse width of 80msec, the flow monitor pulse width extension can be activated to increase the pulse width to 300msec. To activate the smart transfer switch, remove the cover securing the circuit board and remove jumper X-1. This activates the extended function, allowing more time before a fault is indicated. The metering pump is equipped with a self-venting pump head and adopts self-priming suction. Keep the aspiration line as short as possible. 2) Removing and replacing the metering pump diaphragm When removing the old diaphragm, troubles are often encountered. Now for some additional advice on how to remove the old diaphragm. 1. After the pump head is loose, before removing the pump head, adjust the stroke length to 0% position. This ensures that there is enough pressure on the solenoid shaft to keep it firmly attached so that the diaphragm can be unscrewed. 2. Pull the fluid end outward to disengage the screw from the socket. Grab the liquid end and twist counterclockwise. With a little resistance, the diaphragm can be unscrewed. 3. Metered chemicals may crystallize at the fluid end, causing the ball and seat of the check valve to fail to work properly. 4. There may be a gas leak at the suction side of the metering pump. Liquid end suction side connection may be missing O-ring or suction valve connection may be loose. 3) When using flow monitoring to measure a high-viscosity medium, a flow fault indication signal is received during the priming process. How can this problem be solved? Loosen the 4 pump head screws and move the liquid end. Rotate the stroke length to 0% and grab the fluid end, then slide it out of the screw holes so the screws are not in contact with them, but are still holding the backplate and diaphragm. Then turn the part counterclockwise, with some resistance, the diaphragm will loosen from the solenoid shaft. If the diaphragm has not loosened, apply some grease to the contacting surfaces of the diaphragm and the solenoid shaft. After a few minutes, gently tap the diaphragm with a small plastic hammer. Then proceed as described above again. 4) How to prevent the stroke positioning motor of the metering pump from burning out? 1. Remove the 4 screws fixing the pump head. The screw location is on the back of the metering pump. 2. See if the drain pipe is installed and the drain valve is closed? The drain valve needs to be open during the priming phase of the metering pump. NOTE: Not all metering pumps have a drain valve. 3. Install the pump head after the diaphragm is installed and the leak drain hole on the back plate is placed in a vertical position. Make sure that the suction valve is aligned with the leakage discharge hole, and the screw of the liquid end is aligned with the corresponding 4 holes. 5) The flow rate of the hydraulic metering pump becomes smaller or inaccurate? 1. Unscrew the air release valve in the three valves. 2. Sufficiently replenish oil through the oil replenishment valve.