How to Replace the Metering Pump Diaphragm?
Replacing a metering pump diaphragm is a common maintenance task that ensures the pump continues to operate efficiently. Here's a step-by-step guide to help you through the process:
1. Start by removing the four screws that secure the pump head. These screws are typically located on the back of the metering pump.
2. Once the pump head is loosened, adjust the stroke length to 0%. This helps release pressure from the solenoid shaft, making it easier to remove the diaphragm. Make sure the solenoid shaft is under enough pressure to stay in place while you work.
3. Carefully pull the hydraulic end out and remove the screw from its socket. Hold the liquid side of the diaphragm and turn it counterclockwise. You may feel some resistance, but with a bit of effort, the diaphragm should begin to loosen.
4. After removing the old diaphragm, inspect the safety diaphragm for any signs of damage or wear. If everything looks good, install the new diaphragm and turn both the backplate and the diaphragm clockwise until they are securely tightened. Adjust the backplate so that the drain hole is positioned at the bottom of the pump.
5. Reinstall the pump head after the diaphragm is in place. Ensure the drain hole is upright and aligned with the suction valve. Also, make sure the hydraulic end screw matches the corresponding holes on the pump head.
6. Set the stroke length back to 100%. This will help align the assembly properly within the pump. During operation, make sure the hydraulic end and diaphragm are correctly positioned.
7. Finally, tighten the four bolts diagonally, applying even force to ensure a secure fit. This helps maintain proper alignment and prevents future issues.
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I received a spare part kit and had trouble removing the old diaphragm. Can you provide some additional advice on how to remove the old diaphragm?
If you're struggling to remove the old diaphragm, start by loosening the four pump head screws. Rotate the stroke length to 0% and gently pull out the hydraulic end. Hold the backplate and diaphragm while turning them counterclockwise. There might be some resistance, but this should help loosen the diaphragm from the solenoid shaft.
If it still doesn't come off easily, try applying a small amount of lubricant to the contact surfaces between the diaphragm and the electromagnet. Let it sit for a few minutes, then use a plastic hammer to gently tap the diaphragm. This can help break it free without damaging the components.
When self-priming is used to measure hydrogen peroxide, cavitation occurs in the system. How to solve this problem?
Cavitation during self-priming can be caused by improper installation or long piping. To resolve this, make sure the pump is installed correctly, using the exhaust pump head for self-filling suction. Keep the tubing as short as possible to reduce air entrainment and improve performance.
Metering pump installed, after running does not measure liquid?
If your metering pump isn’t measuring liquid properly, check the following:
1. Is the drain pipe installed and the drain valve closed? The drain valve should be open during the dosing phase. Not all pumps have a drain valve, so check your model’s specifications.
2. A gas leak on the suction side could be the issue. Check for missing O-rings or loose connections on the suction valve.
3. The discharge valve might be blocked, preventing liquid flow.
4. The stroke length setting could be incorrect, leading to inaccurate dosing.
5. Crystallization of the chemical on the hydraulic side can cause check valves to malfunction.
I am using flow monitoring to measure a high viscosity medium and receive a flow fault indication during the priming process. What can I do to solve this problem?
High viscosity fluids can sometimes cause flow monitors to trigger false faults due to slow response times. To fix this, consider extending the pulse width of the flow monitor. The standard pulse width is 80 milliseconds, but you can increase it to 300 milliseconds for better accuracy.
To do this, activate the smart change-over switch, remove the cover of the circuit board, and take out the jumper X-1. This will enable the extended pulse width function, giving the system more time to respond before triggering a fault.
How to Prevent Stroke Positioning Motor Burn?
To avoid damaging the stroke positioning motor, always keep the metering pump motor running when adjusting the stroke position. If the motor is off, the adjustment lever will face resistance from the compression spring, which can lead to premature motor failure. Keeping the motor active ensures smooth and safe operation.
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