| 摘要 |
PURPOSE:To effectively prevent damage on the surface of a valve body and ensure its sealing characteristic when a valve is closed, by extending an end, in the side adapted to the valve body, of a coil spring wire rod so as to prevent the end from coming into contact with the valve body. CONSTITUTION:A coil spring 3 forms in its end, in the side adapted to a valve body 2, a ring-shaped part 31 serving as a seat of the valve body 2, while the end 3A of a wire rod, being extended to the outer from an external diameter of the coil spring and positioned outside the ring-shaped part 31, is prevented from coming into contact with the valve body 2. In this way, a check valve, when it is actuated to be opened and closed, enables the end 3A of the wire rod of the coil spring 3 to be prevented from rubbing the valve body 2, preventing a surface of the valve body 2 from flawing by an edge in the end 3A of the wire rod. |
