Backflow preventer with low water loss

Abstract

The invention provides a backflow preventer with low water loss, and belongs to the technical field of valves. The backflow preventer comprises a valve body, a water inlet check valve, a water outlet check valve, a water inlet, a water outlet, a water inlet cavity, a middle cavity, a water outlet cavity, a water escape valve, an elastic part and a water escape valve, wherein the water inlet and the water outlet are arranged at two ends of the valve body, a diaphragm cavity is arranged in the middle cavity and communicates with the water inlet cavity through a water pipe, the lower end of the water escape valve is arranged in the middle cavity, the upper end of the water escape valve is arranged in the diaphragm cavity, the water inlet check valve comprises a valve plate, the side, close to the middle cavity, of the valve plate is perpendicularly and fixedly connected to the inner wall of a valve deck through the elastic part, a magnetic assembly is arranged on the side, close to the water inlet, of the valve plate, and the opening and closing of the water inlet check valve is controlled through joint control of the elastic part and the magnetic assembly by the valve plate. The backflow preventer is simple in structure and easy to install and maintain, a check mechanism formed by combining magnetic force and spring force is adopted, the resistance characteristic of the check valve is changed, and the pursuit of closing reliability and low resistance of the check valve is effectively achieved.

Description

technical field [0001] The invention belongs to the technical field of valves, and relates to a backflow preventer, in particular to a low water loss backflow preventer. Background technique [0002] Existing backflow preventers are divided into two types, one is decompression type and the other is low resistance type. The two products implement two different standards, namely GB / T25178 (decompression type) and JB / T11151 (low resistance type). The two standards define products differently. From the perspective of safety against backflow pollution, the decompression type is safer, among which GB50015 has a clear description, the decompression type is safer, and can be applied to all anti-backflow pollution media, while low resistance is not suitable for dangerous working conditions; From the perspective of adaptability, because the water supply pressure in my country is not high, and in recent years, the country has strictly controlled the water supply pressure in order to sa...

AI Technical Summary

Problems solved by technology

From the perspective of safety against backflow pollution, the decompression type is safer, among which GB50015 has a clear description, the decompression type is safer, and can be applied to all anti-backflow pollution media, while low resistance is not suitable for dangerous working conditions; From the perspective of adaptability, because the water supply pressure in my country is not high, and in recent years, the country has strictly controlled the water supply pressure in order to save energy and reduce consumption, reduce leakage losses, so the water loss of the decompression type backflow preventer in the water supply network is unacceptable.

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