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US 5,307,835 AGranted
Top-entry check valve with threaded fasteners
OwnerJohn P. Scaramucciinventor
Life of this patent
Estimating the term…
Abstract
A top-entry check valve having a seat, cage, disc and removable bonnet utilizes threaded fasteners to prevent movement of the seat, cage and disc in the downstream direction. An annular shoulder in the valve body prevents movement of the seat, cage and disc in the upstream direction. The disc has a hinge pin which is cradled in hinge pin supports of the cage. Removal of the bonnet allows access to the valve chamber for replacement of the seat, cage, disc or threaded fasteners.
Claims13
A top entry check valve, comprising:
- a disc having at least one hinge pin extending along a tangent thereto;
- a seat having an upstream end, a downstream end and a seating surface, the seating surface facing downstream and being shaped to mate with said disc;
- a body having an upstream end, a downstream end, a valve chamber therein communicating with the upstream and downstream ends thereof, and an access opening in a side wall thereof communicating with the valve chamber of a size to accommodate the entry and removal of said disc and said seat therethrough, said body also having an annular shoulder therein facing downstream sized to engage the upstream end of said seat and prevent said seat from moving upstream;
- a bonnet removably attached to said body over said access opening forming a wall of the valve chamber;
- a cage-retainer having a pair of hinge pin supports receiving opposite end portions of the hinge pin of said disc;
- and
- threaded fastener means for securing said cage-retainer to said body within the valve chamber;
- wherein said cage-retainer engages the downstream end of said seat and prevents said seat from moving downstream.
5 more elements
Dependencies are inferred from the claim text.