A liquid storage system and control valve

Abstract

This utility model discloses a liquid storage system and a control valve, including a storage tank having a liquid inlet channel and a gas channel for receiving liquid; an air filter; and a control valve including a valve body, a first channel and a second channel disposed on the valve body, and an opening communicating with the gas channel. The control valve also includes a first control unit disposed on the first channel for communicating with the atmosphere; the control valve further includes a second control unit for controlling the opening and closing of the second channel and the valve body. The air filter is connected to the end of the second channel away from the valve body. The first control unit is open when the gas pressure inside the valve body is greater than the atmospheric pressure; the second control unit is open when the gas pressure inside the air filter is greater than the gas pressure inside the valve body. The control valve of this utility model, with its first and second control units, can open or close when the gas pressure inside and outside the valve body is inconsistent.

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