Automatic back to the water valve itself has a buffer performance, under normal circumstances, the effect is very good, but because of some of the more complex pipeline, but also a very small number of water hammer phenomenon. Automatic backwater valve is a kind of opening and closing valve installed in the boiler backwater system tube, mainly to solve the existing boiler backwater manually opening and closing valve can not be opened and closed with the boiler circulating pump, often caused Boiler overflow problem and design. The main method is to set a piston shaft in the valve body, an upper end of the shaft is connected with the piston, a lower end of the piston is connected with a conical valve, and a pressure spring is arranged under the conical valve. When the boiler circulating pump works, the piston moves downward by the pressure of hot water, the conical valve opens, the water pump loses pressure when the pump stops, and the conical valve rises to close the valve, thus fundamentally solving the problem of boiler overflow.
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