| 摘要 |
<p>A check valve includes: a valve body (12) having an inlet (14), an outlet (16), and an internal cavity (13), wherein the inlet, outlet and cavity are in fluid communication and define a flow path (F); a disk (21) positioned within the cavity, a hinge pin assembly (30a, 30b) pivotally interconnecting the valve body and the disk; biasing means associated with the disk for biasing the disk toward the closed position; and an indicator associated with the hinge pin assembly and attached to the valve body. The disk pivots about a pivot axis between a closed position, in which the disk contacts a seat surface within the cavity, thereby preventing fluid flow along the flow path between the inlet and the outlet, and an open position, in which the disk does not contact the seat surface, thereby enabling fluid flow along the flow path between the inlet and the outlet. The hinge pin assembly includes: a substantially cylindrical hinge pin having a longitudinally-extending bore formed therein and attached to one of the disk and the valve body; and a substantially cylindrical hinge pin core attached to the other of the disk and the valve body. The hinge pin extends substantially parallel to the pivot axis, and the hinge pin bore is eccentrically located within the hinge pin. The hinge pin core extends within the hinge pin bore substantially parallel to the pivot axis. The hinge pin assembly also includes means for eccentrically and rotatably mounting the hinge pin to one of the valve body and the disk. The indicator, preferably an indicator member, extends through a bore in the hinge pin core and is attached to the disk and an indicating device, such as a rheostat or dial, mounted on the valve body.</p> |
