| 摘要 |
PURPOSE: A check valve disc is provided to reduce impact noise or load of a shifting pump and to prevent lifetime degradation of a pipe by smoothly and slowly opening a disc. CONSTITUTION: A check valve disc comprises a disc(200) and a check valve casing(100a). A sealing member(202) of the disc is inserted into a rubber ring(201). The outer diameter of a rear circumferential surface of the disc and the outer diameter of the sealing member inserted into the rubber ring are contacted at a same line with a pipe seat(113). The outer diameter of the front circumferential surface(203) of the disc is inclined inward an axial direction of a pipe. A step(T) is formed in the circumferential surface of the disc because the outer diameter of the front circumferential surface of the disc is smaller than the outer diameter of the rear circumferential surface of the disc The outer diameters of the front and rear circumferential surfaces are formed at equal angles to an X-axis of the disc. The pipe seat contact with the sealing member and the rear circumferential surface of the disc is located in the check valve casing.
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