Replaceable floating gate valve seat seal
AssigneeVetco Gray Inc.
InventorDavid Daniel Comeaux
Life of this patent
Estimating the term…
Abstract
A gate valve includes a floating gate valve seat that effects a seal between a gate of a gate valve and a gate valve body using a metal seal. The gate valve includes a floating gate valve seat interposed between a gate and a gate valve body. The gate valve seat has a spring member with a cylindrical portion secured to the gave valve seat. The spring member has a leg that exerts a spring force against the gate valve body to maintain a seal between the floating gate valve seat and the gate. A metal-to-metal seal seals between the cylindrical portion of the spring member and a cylindrical portion of the gate valve seat.
Claims20
A gate valve seat for reception in a gate valve passage counterbore comprising:
- a tubular body having a face for contact with a gate, and an outer end for location in the counterbore;
- an annular cylindrical surface defining a recess extending inward from the outer end of the tubular body;
- a spring member having a cylindrical portion that fits on the cylindrical surface of the recess and a leg having a free end for abutting a shoulder of the counterbore;
- and
- a metal-to-metal seal between the cylindrical portion of the spring member and the cylindrical surface of the recess.
A gate valve having a flow passage intersected by a chamber containing a gate and a counterbore formed in the flow passage, the gate valve comprising:
- a tubular body having a face for contact with a gate, and an outer end for location in the counterbore;
- an annular cylindrical surface defining a recess extending inward from the outer end of the tubular body;
- a spring member having a cylindrical portion that fits on the cylindrical surface of the recess and a frustoconical leg having a free end for abutting a shoulder of the counterbore;
- and
- a metal-to-metal seal between the cylindrical portion of the spring member and the cylindrical surface of the recess;
- and
- wherein the tubular body is adapted to fit loosely in the counterbore for axial movement relative to an axis of the passage.
A method of sealing around a seat ring of a gate valve, comprising:
- (a) providing a tubular body having a face for contact with a gate, an outer end for location in a counterbore, and an annular cylindrical surface defining a recess extending inward from the outer end;
- (b) fitting a spring member having a cylindrical portion on the cylindrical surface of the recess and abutting a frustoconical leg having a free end against a shoulder of the counterbore;
- (c) creating a metal-to-metal seal between the cylindrical portion of the spring member and the cylindrical surface of the recess;
- and
- (d) adapting the tubular body (27) to fit loosely in the counterbore for axial movement relative to an axis of the passage.
Dependencies are inferred from the claim text.