What is a chemical pump filter?

The operational principle of chemical pump filters is elegantly simple yet incredibly efficient:

1. Inlet Flow: The liquid enters the filter through the inlet.
2. Precision Filtration: The liquid proceeds through the internal filter element for precision filtration.
3. Effective Filtration: Fine particles are meticulously filtered out as the liquid passes through the filter cartridge.
4. Clear Water Output: The result is the discharge of clear, filtered water from the outlet.

While akin to the operation of a cartridge vacuum filter, the filter’s surface structure varies slightly. The filtration surface comprises a disk composed of numerous individual cartridges. Each cartridge functions as a distinct filtration unit, with impurities being captured and adsorbed by the filter element’s surface during the process.

Selecting an appropriate chemical pump filter involves several key considerations:

1. Filter Material Selection: The choice of pump or filter material should align with the chemical solution’s composition, concentration, and temperature. For instance:
   • PPH material suits conditions up to 70 degrees Celsius and resists most acids and alkalis.
   • PVDF material can withstand temperatures of up to 90 degrees Celsius and is resistant to strong acids.
2. Application-Specific Selection: Tailor your choice of pump or filter to match customer requirements and specific applications. For example:
   • Magnetic pumps excel in applications like electrophoretic paint and pearl nickel plating.
   • Self-priming pumps are ideal for electroplating liquid transfer and wastewater treatment.
3. Flow and Filtration Requirements: Select pumps based on head and flow requirements, while filters should be chosen according to the desired filtration volume. Calculate the filtration volume by multiplying the cartridge tank’s capacity by the number of cycles per hour.

To ensure the safe and efficient operation of Chemical Pump Filters, adhere to these crucial precautions:

1. Pressure Prohibition: Never use the electroplating filter under pressure or when materials are present. Operate in the correct sequence, commencing with the opening of the vibration device followed by the bottom valve.
2. Proper Installation: During filter installation, place a filter bottom valve at the inlet of the conveying equipment or the filter’s inlet. This precaution prevents pipeline debris from entering the filter, safeguarding acid- and alkali-resistant pumps and filters.

Chemical pump filters are critical components in various industrial applications, but like any equipment, they can encounter issues. Here, we address three common filter failures and provide corresponding solutions:

1. Leakage of the Upper Cover of Precision Chemical Filters

1. Aging or Breakage of Top Cover Feet: If the top cover feet are aged, lost elasticity, or broken, the solution is simple—replace them with new ones.
2. Filter Element Deformation: In cases of slight leakage due to filter element deformation, you can modify the upper cover, secure the handle tightly, and carefully replace the filter element.
3. Loose Handle and Excessive Pressure: If the handle is not tightened properly, causing excessive pressure, we recommend regular cleaning of the cartridge, securing the handle, and avoiding prolonged high-pressure treatment of the cartridge.
4. Seal Issues: Leakage can also result from debris, damage, or scratches at the seal. Address this by inspecting and cleaning the gasket, removing any debris within the cylinder, and if necessary, welding and replacing the cartridge carefully.

2. Precision Chemical Filters Fails to Absorb Water

1. Foreign Matter in Suction Pipe: If the plating filter isn’t absorbing water, check and remove foreign matter from the suction pipe and ball valve.
2. Shaft Seal Issues: Avoid burning out or idling the shaft seal. If it occurs, replace the shaft seal. The same applies to self-priming pumps; do not let them idle, and replace the shaft seal if needed.
3. Pipeline Blockage: Sometimes, foreign matter may block the pipeline. Open the main unit and clean out any foreign matter.
4. Vertical Pump Considerations: For vertical pumps, consider installing a liquid level foot valve and non-return valve or adjusting the liquid level. Reducing the pump’s height can also help.
5. Chemical Pump Installation: When installing chemical pumps or water pumps higher than the liquid level of the bottom valve, ensure the pipeline pumps water injection. Additionally, increase the self-priming tank and position the pipeline as low as possible relative to the liquid level.
6. Motor Rotation: Check and adjust the motor to ensure it’s rotating in the correct direction.
7. Asynchronizer Issues: If you observe a separation of the asynchronizer and bushing or asynchronization of the motor shaft, replace the asynchronizer and asynchronization key. Inspect for any damage to the shaft seal.

3. High Pressure in Precision Chemical Filters

1. Filter Blockage: Observe the water output; if the pressure is lower than the water output, it’s likely due to filter blockage. Clean or replace the filter cartridge as needed.
2. Elevator Height: High pressure can occur if the elevator height is excessive. This is a normal phenomenon as higher lift results in smaller flow and higher pressure.
3. Pressure Gauge Issues: If the pressure gauge isn’t reading correctly or can’t be zeroed, test and replace it as necessary.
4. Outlet Blockage: Check for blockages in the outlet pipe and ball valve if there’s high pressure without water. Replace or clear any obstructions found.

Addressing these common failures promptly and effectively ensures the continued reliable performance of chemical pump filters, enhancing the efficiency and safety of various industrial processes.