Vacuum anti-siphon backflow preventing valve

Abstract

The invention discloses a vacuum anti-siphon backflow preventing valve and relates to a fluid medium pipeline control part. The valve comprises a valve body, a water inlet and a water outlet are arranged on the valve body, a valve cavity communicated with the water inlet is arranged on the valve body, a valve opening is arranged between the valve cavity and the water outlet to communicate the valve cavity with the water outlet, and a valve clack component enabling media to flow unidirectionally from the valve cavity to the water outlet is arranged in the water outlet. An air outlet for communicating the valve cavity with the outside is arranged at the top of the valve body. A support filter screen covering the valve opening is arranged in the cavity. A buoyancy seal component is arranged at the air outlet for sealing the air outlet when media flow forward from the water inlet to the water outlet or opening the air outlet when media flow reversely from the valve cavity to the water inlet. By means of the vacuum anti-siphon backflow preventing valve, the structure is simplified, backflow is prevented effectively, air in the valve cavity can be discharged rapidly when media get back to forward flow, and functions of impurity filtering and purifying are provided. The valve is mainly applied to pipeline systems in need of anti-pollution check, such as urban water supply systems.

Description

technical field [0001] The invention relates to a fluid medium pipeline control component, in particular to a vacuum anti-siphon backflow prevention valve. Background technique [0002] The existing vacuum anti-siphon backflow prevention valves all include a valve body, the valve body is provided with a water inlet and a water outlet, the valve body is provided with a valve cavity connecting the water inlet and the water outlet, and a The air outlet where the valve cavity communicates with the outside world is provided with a valve core or valve disc in the valve cavity, and the position of the valve core or valve disc is changed according to the flow direction of the medium in the valve cavity to change the on or off of the valve body. In the prior art, the general structure is relatively complicated, and it does not have the function of discharging the gas in the valve chamber when the medium returns to the forward flow; and when the anti-siphon function is realized, the v...

AI Technical Summary

Problems solved by technology

In the prior art, the general structure is relatively complicated, and it does not have the function of discharging the gas in the valve chamber when the medium returns to the forward flow; and when the anti-siphon function is realized, the valve core or disc needs to be controlled by a spring, and the sensitivity lower

When a part of air is sucked into the valve chamber, the valve is closed. When the pipeline pressure is unstable, the valve core or disc moves repeatedly, which cannot realize the function of preventing backflow, and the noise is loud

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