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How to replace the diaphragm of a metering pump? 1. Remove the 4 screws fixing the pump head. The screw location is on the back of the metering pump. 2. After the pump head is loose and before removing the pump head, adjust the stroke length to the 0% position. It can ensure that there is enough pressure on the solenoid shaft to keep its connection stable, so that the diaphragm can be unscrewed. 3. Pull the fluid end outward to disengage the screw from the socket. Grasp the liquid end and twist counterclockwise. With some resistance, the diaphragm can be unscrewed. 4. Once the diaphragm is removed, inspect the metering pump’s safety diaphragm to make sure it is intact and without any damage. To install the new diaphragm, rotate the backing plate and diaphragm clockwise until they are snug. Adjust the backing plate so that the leakage drain hole is at the bottom of the pump. 5. After the diaphragm is installed and the leakage discharge hole of the back plate is placed in a vertical position, install the pump head. Make sure the suction valve is aligned with the leakage discharge hole, and the screws on the liquid end are aligned with the corresponding 4 holes. 6. Rotate to the 100% position of the stroke length. This allows the entire assembly to be rotated so that the leak drain hole in the back plate is aligned with the lowest end of the pump. Adjust the liquid end and diaphragm to the proper position while the pump is running. 7. After the positions of the fluid end and the backing plate are adjusted, tighten the four bolts diagonally until they are suitable. Use even pressure when completing this job. More content: ProMinent leads the new trend in precision metering I received a spare parts package and am having trouble removing the old diaphragm. Can you give me some additional advice on how to remove the old diaphragm? Move the fluid end by loosening the 4 pump head screws. Rotate the stroke length to 0% and grasp the fluid ends, then slide them out of the screw holes so that the screws are not in contact with them but are still holding the backing plate and diaphragm. Then rotate this part counterclockwise and with some resistance, the diaphragm will loosen from the solenoid shaft. If the diaphragm is not loose yet, apply some lubricant to the contact surface between the diaphragm and the solenoid shaft. After leaving it for a few minutes, tap the diaphragm lightly with a small plastic hammer. Then proceed again as described above. When the self-priming method is used to meter hydrogen peroxide, air pockets are generated in the system. How to solve this problem? The metering pump is equipped with a self-venting pump head and adopts self-priming liquid suction. Keep the aspiration line as short as possible. The metering pump is not metered after installation and operation? 1. Is the discharge pipe installed and the discharge valve closed? The drain valve needs to be opened during the priming phase of the metering pump. Notice: Not all metering pumps have drain valves. 2. There may be gas leakage at the suction end of the metering pump. The liquid end suction side connection may be missing an O-ring or the suction valve connection may be loose. 3. The bottom valve of the metering pump may be blocked and the metered liquid cannot pass through. 4. The stroke length setting of the metering pump is inappropriate. 5. The metered chemicals may crystallize at the liquid end, causing the check valve ball and seat to not work properly. I am using flow monitoring to meter a high viscosity medium and I received a flow failure indication signal during the priming process. What can I do to solve this problem? The pulse duration may not be long enough for the reaction time. Compared to the standard pulse width of 80msec, the flow monitor pulse width extension can be activated, increasing the pulse width to 300msec. Activate the smart transfer switch, remove the protective cover holding the circuit board, and remove jumper X-1. This activates the extended functionality, allowing more time before a fault is indicated. How to prevent the stroke positioning motor from burning? When adjusting the stroke position, ensure that the metering pump motor is always running. If the metering pump motor is not running, the stroke length adjustment rod will resist the tension of the compression spring, which will cause premature damage to the stroke positioning motor.