Underwater ball valve

Filter (filter) is an indispensable device on the transmission medium pipeline, usually installed in the pressure reducing valve, pressure relief valve, water level valve, Fang Gong filter other equipment of the inlet end equipment. The filter is composed of a cylinder, a stainless steel filter screen, a sewage part, a transmission device and an electrical control part. After the water to be treated passes through the filter cartridge of the filter screen, its impurities are blocked. When cleaning is required, as long as the detachable filter cartridge is taken out and reloaded after treatment, it is very convenient to use and maintain.

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Underwater ball valve

The water to be treated by the filter enters the body from the water inlet, and the impurities in the water are deposited on the stainless steel filter screen, thereby generating a pressure difference. Through the differential pressure switch to monitor the inlet and outlet pressure change, when the pressure difference reaches the set value, the electric controller to the hydraulic control valve, drive motor signal. After the equipment is installed, the technicians will debug and set the filtering time and cleaning conversion time. The water to be treated enters the machine body through the water inlet, and the filter starts to work normally. When the preset cleaning time is reached, the electric controller will give signals to the hydraulic control valve and the drive motor to cause the following actions: the motor drives the brush to rotate to clean the filter element, and the control valve is opened to drain the water. The whole cleaning process only lasts for tens of seconds, when the cleaning is completed, the control valve is closed, the motor stops rotating, the system returns to its initial state, and the next filtration process begins. The inside of the shell of the filter is mainly composed of coarse filter screen, fine filter screen, suction pipe, stainless steel brush or stainless steel suction nozzle, sealing ring, anti-corrosion coating, rotating shaft, etc.

Separating the container into upper and lower chambers with a filter medium constitutes a simple filter. The suspension is added to the upper chamber and enters the lower chamber into the filtrate through the filter medium under pressure. The solid particles are trapped on the surface of the filter medium to form filter residue (or filter cake). During the filtration process, the filter residue layer accumulated on the surface of the filter medium gradually thickens, the resistance of the liquid passing through the filter residue layer increases, and the filtration speed decreases. When the filter chamber is full of filter residue or the filtration speed is too small, stop the filtration, remove the filter residue, and regenerate the filter medium to complete a filtration cycle.
The liquid passing through the filter residue layer and the filter medium must overcome the resistance, so there must be a pressure difference on both sides of the filter medium, which is the driving force for the filtration. Increasing the pressure difference can accelerate the filtration, but the deformed particles are easy to block the pores of the filter medium when the pressure difference is large, and the filtration slows down.

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