| 摘要 |
<p>The non-return valve has a sealing surface (7) that is provided on outer circumference of a valve disc (6) of a valve housing (1), and a mating sealing surface (5) that is provided on inner circumference of a seat ring (4) along circumferential direction. The lateral surface is of an oblique truncated cone shape. A plane (y) is extended orthogonally along longitudinal axis (3) of a circular passage opening (2), such that the quotient of minor axis and major axis is greater than 0.98. The sealing surfaces of the valve disc and the seat ring are made of metal.</p> |
