Novel air valve type check valve

Abstract

The invention discloses a novel air valve type check valve. The novel air valve type check valve comprises a left flange, a right flange and an air valve assembly, and a valve body assembly is arranged inside the left flange and the right flange. Two annular grooves are correspondingly formed in the joints of the outer side of the valve body assembly with the left flange and the right flange, thetwo annular grooves are correspondingly formed in the upper and lower portions of the joints of the valve body assembly with the left flange and the right flange, and the two annular grooves are symmetrically formed in an up and down mode. The novel air valve type check valve improves a sealing gasket, an original annular sealing gasket is changed into a graphite-coated type tooth-shaped sealing gasket, and a fit clearance between a valve body and the air valve assembly is reduced; and a fluorine rubber O-ring is added for secondary sealing, and a trace of leakage is completely blocked in thevalve body. The novel air valve type check valve adopts an open type air valve structure of which sealing of the valve body and the air valve assembly is all completed on a valve seat, so that a leakage point between the valve cover and the valve seat on an air valve is avoided, and the structure is more excellent, reasonable and safe.

Description

technical field [0001] The invention relates to the technical field of check valves, in particular to a novel air valve type check valve. Background technique [0002] Check valve refers to a valve whose opening and closing disc relies on its own weight, spring force and medium pressure to block the backflow of the medium. According to the movement mode of the disc, it can be divided into lift type and swing type. 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 disadvantage is that the resistance is large and the sealing is poor when closed. At present, there are many structures of air valve check valves on the market, which can be roughly divided into two types: bell check valve and wafer check valve; due to the advantage of space, the pressure loss of bell check valve is very low, but Due to the bell body structure, the body size is too larg...

AI Technical Summary

Problems solved by technology

[0003] However, the check valves in the current market also have the following defects: the sealing gasket between the valve assembly and the valve body is designed by most manufacturers as ordinary metal ring gaskets, and the materials are mostly copper and 10# steel, which requires high sealing of the plane , need to have good roughness, and need too large pre-tightening force to ensure that most of the check valves have different degrees of leakage; most manufacturers design the seal between the valve seat and the valve cover as a grinding surface seal, and the manufacturing requirements are very high. High, and most of them have leakage; most check valve manufacturers do not have the ability to design air valves, and the air valve check valves produced have high pressure loss, poor flow capacity, and low service life

Images