What should I do if the metering pump malfunctions while adding medication?

When adding chemicals, precision requirements are quite important, so dosing pumps often use metering pumps, which can accurately control the amount of chemicals added. So when using a metering pump, what aspects and details should be carefully checked to avoid malfunctions?
Since not all metering pumps are equipped with a discharge valve, it is necessary to first check whether it exists, and then require it to be opened during the metering pump suction phase. If it is found that there may be gas leakage at the suction end of the metering pump, it is likely that the hydraulic end suction side connection may lack an O-ring or the suction valve connection may be loose, so it is also important to check here.
During use, it is important to avoid cleaning the hydraulic end of the metering pump with chemicals to prevent the ball and seat of the one-way valve from working properly. If there is indeed a malfunction in the metering pump, it must be promptly identified and resolved as soon as possible.
The first thing to do is to unscrew the screw fixing the pump head of the metering pump, and adjust the stroke length to 0% after the pump head is loose and before removing the pump head; At the same time, ensure that the electromagnetic shaft of the metering pump has sufficient pressure to maintain a stable connection, so that the diaphragm can be unscrewed.
Once the diaphragm is removed, check the safety diaphragm of the metering pump to ensure that it is intact and undamaged.
If there is any damage, it needs to be removed and replaced with a new one. Rotate the back plate and diaphragm clockwise until they are tightly attached; At the same time, it is necessary to adjust the back plate so that the leakage discharge hole is located at the bottom of the pump.
After the diaphragm in the metering pump is installed and the backplate leakage discharge hole is placed in a vertical position, install the pump head, ensuring that the suction valve is aligned with the leakage discharge hole, and the screws on the hydraulic end are aligned with the corresponding four holes. Then rotate to the position of 100% stroke length; Adjust the hydraulic end and diaphragm to the proper position during the operation of metering pump.

Inlet filters of EVP piston pumps