Water Filtration

An automatic screen filter, also known as a self-cleaning screen filter, is a type filtering system that uses system pressure to clean itself.

Cooling water enters the filter through an inlet, then passes through a rigid cylindrical screen from the inside out, causing particles larger than the openings of the screen to accumulate on the inside surface and form a filter cake. Filtered water leaves the filter body through the outlet. The buildup of the filter cake in the upstream side of the screen causes a difference in pressure between the inlet and outlet of the filter.

A controller monitors the pressure in the filter and opens a flush valve when it senses a differential pressure threshold has been exceeded. When the flush valve opens to atmosphere, the difference between the higher pressure of water inside the filter and the atmosphere outside the filter body causes high suction forces at the openings of each of the suction scanner nozzles. The suction force causes water to flow backward through the screen in a small area at very high velocity at each nozzle, pulling the filter cake off the screen and forcing it into the suction scanner and out the exhaust valve to waste.

Fully automatic self-cleaning screen filters provide an economical means of removing suspended solids down to 10 microns from cooling tower water. The use of weave-wire screens as the filtering media provides a positive removal system eliminating all particles larger than the filtration degree of the screen from the cooling system. The efficient suction scanning principle allows the filter cake to be removed completely from the screen surface within seconds without physically touching the cake or screen. During the suction scanning cleaning cycle the filtration process is uninterrupted; thereby, providing filtered water downstream of the filter at all times, eliminating the need for duplex systems. Water and chemical losses are kept to a minimum, and organic and inorganic solids are removed with equal efficiency.

Automatic self-cleaning screen filters lend themselves to many industrial, commercial and power generation cooling tower applications.

Contact us TODAY to discuss practical and effective water filtration solutions for the cooling tower water in your factory.

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