Float-bowl type lifting valve for filter tank

Abstract

The invention discloses a float-bowl type lifting valve for a filter tank. A water inlet / outlet pipe which is used for enabling to-be-filtered water to flow into the filter tank and back-washing waterto flow out of the filter tank is vertically arranged in the filter tank; a valve seat is arranged in an upper port of the water inlet / outlet pipe; a valve core which can be driven by a driving mechanism to be moved up and down so as to control opening / closing of valve is arranged above the valve seat; a float bowl which can be suspended in water is arranged at the upper end of the water inlet / outlet pipe in a sleeving manner; the upper end of the float bowl is opened to form a water inlet / outlet; an inner side wall of the float bowl is connected with an outer side wall of the water inlet / outlet pipe in a sliding and sealing manner, so that the float bowl can be changed along a water level in the filter tank so as to be floated up and down along the water inlet / outlet pipe, and thus, theheight of the water inlet / outlet formed in the upper end of the float bowl is changed. The height of the water inlet / outlet is changed along with the change of the liquid level, so that the water inlet / outlet is always adapted to the liquid level of the filter tank in a back-washing water drainage process, and therefore, loss of filter water along with the water is prevented. In addition, the back-washing efficiency is higher, the back-washing times can be reduced, the back-washing time is shortened, and the using efficiency of the filter tank is improved.

Description

technical field [0001] The invention relates to a filter tank valve, in particular to a water valve used for filter tank water to be filtered and backwashing drainage. Background technique [0002] In the water purification process, filter filtration is an important part. During the filtration process, the impurities filtered out of the water will continue to accumulate in the filter material layer. Excessive accumulation will lead to unqualified effluent quality and lower water production efficiency. Therefore, it is necessary to remove the accumulated impurities in the filter material layer by backwashing. During the backwashing process, water or air flow reversely impacts the filter material layer, so that the impurities deposited in the filter material layer are loosened, released and suspended in the water, and then discharged with the water to achieve the purpose of cleaning. During the backwashing process, not only the impurities will be washed out from the filter m...

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to overcome the problem that the height of the outlet of the existing filter tank is fixed, it cannot adapt to the change of the liquid level of the filter tank, and the loss of the filter material is large during drainage, and to provide a float type lift valve for the filter tank

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