Anti-backflow type novel check valve

Abstract

The invention discloses an anti-backflow type novel check valve, and belongs to the technical field of check valves. According to the anti-backflow type novel check valve, the backflow phenomenon can be sensed through an anti-backflow ball arranged on the side wall of a valve element, in a positive flow state, the anti-backflow ball is triggered to move outwards by extruding a triggering film, a sensing mode is closed in cooperation with a backflow plate, in the closed state, the triggering film recovers the shape, the anti-backflow ball is separated from the backflow plate and recovers the sensing mode, when the backflow phenomenon occurs, moisture is guided and conveyed into the anti-backflow ball, the moisture is utilized in turn based on the physical dissolution action, then the cooling phenomenon is triggered in the anti-backflow ball, and back flowing water is forced to be frozen at the valve element through rapid cooling, so that sealing is formed, the water is prevented from further flowing back, the sealing performance of the valve element in the closed state is improved, and the backflow phenomenon is not prone to occurring.

Description

technical field [0001] The invention relates to the technical field of check valves, in particular to a new type of anti-reflux check valve. Background technique [0002] Check valve refers to a kind of valve whose opening and closing parts are circular discs, which can block the reverse flow of medium by acting on its own weight and medium pressure. It is an automatic valve, also known as check valve, one-way valve, return valve or isolation valve. The disc movement mode is divided into lift type and swing type. The lift check valve is similar in structure to the globe valve, except that it lacks the valve stem to drive the disc. The medium flows in from the inlet port (lower side) and flows out from the outlet port (upper side). When the inlet pressure is greater than the sum of disc weight and its flow resistance, the valve is opened. Conversely, the valve is closed when the medium flows backwards. The swing check valve has an oblique disc that can rotate around the ...

AI Technical Summary

Problems solved by technology

Check valves are automatic valves, mainly used in pipelines with one-way flow of medium, and only allow the medium to flow in one direction to prevent accidents, but the disadvantages of check valves are also very obvious, that is, their sealing performance is poor, Although the reverse flow of fluid can be prevented, the problem of reverse leakage often occurs, which severely limits the application of check valves

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