The grooved butterfly valve can be used for fire protection, and its function is very good. It lies in the structure of the grooved butterfly valve. We will introduce the specific structure details in the following. The gas filter is composed of a shell, a multi-element filter element, a backwashing organization, an electric control box, a reducer, an electric valve and a differential pressure controller.
The transverse partition in the shell divides the inner cavity into upper and lower cavities. The upper cavity is equipped with multiple filter elements, which makes full use of the filtering space and significantly reduces the volume of the filter. The lower cavity is equipped with a backwash suction cup . During operation, the turbid liquid enters the lower cavity of the filter through the inlet, and then enters the inner cavity of the filter element through the partition hole. The impurities larger than the gap of the filter element are intercepted, and the clean liquid passes through the gap to reach the upper cavity, and is finally sent out from the outlet.
The gas filter and the active sewage filter element use a high-strength wedge-shaped filter screen, which is actively cleaned by pressure difference control and punctual control. When the impurities in the filter accumulate on the surface of the filter element, the pressure difference between the inlet and outlet increases to the set value, driving the backwashing of the tissue. When the backwash suction cup is facing the inlet of the filter element, the blowdown valve is opened, and the system is now drained. The suction cup and the inner side of the filter element present a negative pressure zone where the relative pressure is lower than the water pressure outside the filter element.
Part of the net circulating water is forced to flow from the outside of the filter element to the inside of the filter element, and the impurity particles adsorbed on the inner wall of the filter element flow into the shank with the water and are discharged from the drain valve. The specially designed filter screen makes the inside of the filter element erupt, and any impurities will be washed away from the lubricated inner wall. When the pressure difference between the inlet and outlet of the filter recovers normally or the timing of the timekeeping device is completed, the material flows continuously during the whole process, and the backwashing consumes less water, completing the continuous operation and automatic production.
