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How to replace the diaphragm of the metering pump diaphragm

2018-12-18 14:04:40

Metering pumps are used more and more in the current pump market. Diaphragm metering pumps are used in special environments, but in the course of use, diaphragms may be damaged due to unsuitable operation or other reasons. Then, once the diaphragm of the metering pump is found to be damaged and not replaced in time, it will cause unsatisfactory results. How to replace the diaphragm of the metering pump?


1. Remove the 4 screws that secure the pump head. The screw is located on the back of the metering pump.

2. After the pump head is loose, adjust the stroke length to 0% position before removing the pump head. It is possible to ensure that the electromagnetic shaft has sufficient pressure to keep its connection stable so that the diaphragm can be unscrewed.

3. 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.

4. 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. Adjust the backing plate so that the leaking drain hole is at the bottom of the pump.

5. Install the pump head after the diaphragm has been installed and the backing fluid drain hole is in the vertical position. Make sure the suction valve is aligned with the leak drain hole and the screw on the hydraulic end is aligned with the corresponding 4 holes.

6. 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.

7. 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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