| 摘要 |
<p>A unidirectional valve includes a generally tubular housing through which fluid can flow substantially in a straight line. The housing has an interior valve seat portion at the inlet end, in the direction of desired flow, and a valve member which is axially movable by the fluid medium. The valve member includes a rigid annular part and a flexible part and is carried by an axially movable guide member to which the rigid part of the valve member is attached The flexible portion consists of a tapered control skirt extending outwardly from the rigid part. Small differences in pressure or flow volume in the reverse direction cause the flexible part to move outwardly against a sliding surface on the interior of the housing, moving the valve member axially toward the valve seating surface in the closed position. Flow in the desired direction causes the skirt to move axially and fold toward the rigid portion. Various embodiments of the valve member and guide arrangements are shown.</p> |
