Low-resistance reverse flowing preventer

Abstract

The invention relates to a low-resistance reverse flowing preventer. The low-resistance reverse flowing preventer comprises a valve body consisting of a water inlet valve body and a water outlet valvebody, a first-grade check valve positioned in a valve inlet of the water inlet valve body, and a second-grade check valve positioned in a valve outlet of the water outlet valve body; and a middle cavity is formed between the first-grade check valve and the second-grade check valve. Water currents of the reverse flowing preventer can flow out of the valve body only by once overturning in the valve, so that the total flowing resistance of the reverse flowing preventer is reduced; and the whole device is simple in structure and convenient to disassemble and maintain.

Description

technical field [0001] The invention relates to the field of valve devices, in particular to a low-resistance backflow preventer. Background technique [0002] As a control valve, the check valve is mainly used to prevent the backflow of fluid in the pipeline. Various check valves are disclosed in the prior art. For example, the Chinese utility model patent CN205534421U discloses an improved check valve. A first-stage valve flap and a second-stage valve flap are respectively installed between the water end and the water outlet end, the water inlet end and the water outlet end are provided with a fixing frame, and a spring is arranged between the first-stage valve flap and the fixing frame, and the There is also a spring between the first-stage disc and the second-stage disc. The double-disc design forms a double check function, which can quickly and effectively prevent the medium from flowing back, and can also prolong the service life of the valve and the connecting pipelin...

AI Technical Summary

Problems solved by technology

[0002] As a control valve, the check valve is mainly used to prevent the backflow of fluid in the pipeline. Various check valves are disclosed in the prior art. For example, the Chinese utility model patent CN205534421U discloses an improved check valve. A first-stage valve flap and a second-stage valve flap are respectively installed between the water end and the water outlet end, the water inlet end and the water outlet end are provided with a fixing frame, and a spring is arranged between the first-stage valve flap and the fixing frame, and the There is also a spring between the first-stage disc and the second-stage disc. The double-disc design forms a double check function, which can quickly and effectively prevent the medium from flowing back, and can also prolong the service life of the valve and the connecting pipeline, but still has The following disadvantages: because the double disc backflow preventer uses two identical discs, when the water flow passes through the valve body, it needs to be flipped twice before it can flow out of the valve body.

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