Metering pumps may often have some minor faults during long-term use. If we can master the corresponding solutions, the metering pump efficiency will definitely be improved. The following describes the common faults and solutions of metering pumps:
First, the proposal to remove the old diaphragm:
Move the hydraulic end by loosening the 4 pump head screws. Rotating the stroke length to 0% and grasping the hydraulic end, then sliding out of the screw hole, the screws do not touch them, but also hold the back plate and diaphragm. Then turn the part counterclockwise, with a little resistance, the diaphragm will loosen from the electromagnetic shaft. If the diaphragm is not loose yet, use some lubricant on the contact surface of the diaphragm and the electromagnetic shaft. After a few minutes, gently tap the diaphragm with a plastic hammer. Then proceed again as described above.
Second, to solve the problem of generating cavitation in the system when self-priming is used to measure hydrogen peroxide:
The metering pump is installed from the exhaust pump head and uses self-priming aspiration. Keep the aspiration line as short as possible.
Third, replace the diaphragm pump method and steps:
A. Remove the 4 screws that secure the pump head. The screw position is on the back of the metering pump;
B. After the pump head is loose, adjust the stroke length to 0% position before removing the pump head. It can ensure that the electromagnetic shaft has sufficient pressure to keep its connection stable so that the diaphragm can be unscrewed;
C. Pull the hydraulic end outward to disengage the screw from the socket. Grab the liquid end and rotate it counterclockwise. With a little resistance, you can unscrew the diaphragm;
D. Once the diaphragm is removed, inspect the safety diaphragm of the metering pump to ensure it is intact without any damage. Install a new diaphragm and rotate the back plate and diaphragm clockwise until they are tight. Adjusting the back plate so that the leakage drain hole is at the bottom end of the pump;
E. Install the pump head after the diaphragm has been installed and the back plate leakage drain hole is placed in the vertical position. Make sure that the suction valve is aligned with the leaking discharge hole, and the screw at the hydraulic end is aligned with the corresponding four holes;
F. Rotate to the 100% position of the stroke length. This allows the entire set of components to be rotated to the back plate leakage drain hole to align with the bottom end of the pump. Adjust the hydraulic end and diaphragm to the proper position during pump operation;
G. When the hydraulic end is adjusted with the backing plate position, the four bolts are tightened diagonally until appropriate. Apply even force when doing this work.
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