Structure of check valve

摘要

Provided is an attachment structure of a check valve that is easily attached to piping, and does not need time and effort of manufacturing. A valve casing having a collar part is attached so as to be sandwiched between a pair of flanges joined to each other through an annular seal body in an upstream side in a fluid flow direction. In this valve casing, a valve is biased in a seating direction to a valve seat through a shaft and a biasing means.

主权项

1. A check valve comprising:
a valve casing that has a collar part at an outer periphery of one end of a cylindrical part, and has a valve seat at an other end opening of the cylindrical part; a shaft support part that has an insertion part for a shaft at a center, and in which a coupling part is formed that extends outwardly in a radial direction from the insertion part, and in which an end of the coupling part is connected to an inner periphery of the valve casing; the shaft whose one end is inserted and secured to the insertion part of the shaft support part, and whose other end is projected; a valve in which the shaft is inserted in a center hole in a liquid-tight manner, and that is removably seated on the valve seat; and a biasing means that biases the valve in a seating direction, wherein the valve of the check valve is arranged inside a flexible rubber pipe body having respective metal flanges at respective ends, and the collar part of the check valve is attached so as to be sandwiched between the flange and a flange of piping facing the flange through an annular seal body; and the shaft remains in a fixed position when the valve is opened and closed; and wherein an outer diameter of the cylindrical part of the valve casing is smaller than an inner diameter of an end of an insertion side of the flexible rubber pipe body,and wherein
the collar part of the valve casing is arranged between the flanges and an annular passage is formed between the cylindrical part and the flexible rubber pipe body,and wherein
the collar part is of sufficient thickness to accommodate a bypass path,and wherein
a bypass path is formed in the collar part and openably communicates with an inlet/outlet port provided at an inner periphery of the cylindrical part at which the collar part is located with an inlet/outlet port provided at a flat surface of the collar part,and wherein
the bypass path and the annular passage communicate with each other.