Check valve

摘要

A check valve includes a tubular casing, an abutment member, a valve member and a resilient member. The abutment member is flexible, is disposed in the tubular casing, and defines a central opening interconnecting first and second spaces that are defined in the tubular casing. The valve member is disposed in the tubular casing and is movable between a blocked position where the valve member blocks the central opening to isolate the first space from the second space, and an unblocked position where the valve member is spaced apart from the abutment member such that the first and second spaces communicate with each other. The resilient member is mounted to the tubular casing and biases the valve member toward the blocked position.

主权项

1. A check valve adapted for use in a hydraulic system, comprising: a tubular casing extending along an axis and having a first inner surrounding surface that surrounds the axis and that defines a first space therein, a second inner surrounding surface that surrounds the axis and that defines a second space therein, and an annular first shoulder surface that interconnects said first and second inner surrounding surfaces; an abutment member made of a flexible material and having an annular section that clings to said first shoulder surface and that defines a central opening interconnecting said first and second spaces; a valve member disposed in said tubular casing and movable along the axis between a blocked position where said valve member blocks said central opening of said abutment member to isolate said first space from said second space, and an unblocked position where said valve member is spaced apart from said abutment member and is retained in said first space such that said first and second spaces communicate fluidly with each other; and a resilient member mounted to said tubular casing and biasing resiliently said valve member toward the blocked position; wherein, said central opening of said abutment member has a diameter greater than that of an opening that is defined by said first shoulder surface of said tubular casing such that when said valve member is at the blocked position, said valve member abuts against said annular section of said abutment member and said first shoulder surface of said tubular casing simultaneously; and wherein said abutment member further has a tubular section connected to said annular section and clinging to said first inner surrounding surface, wherein at least a portion of said resilient member is located within said tubular section of said abutment member.