Back to results
US 2007/0163655 A1Published application
Low friction coatings for dynamically engaging load bearing surfaces
AssigneeVetco Gray Inc.
InventorRick Hunter
Life of this patent
Estimating the term…
Abstract
A gate valve has a body, the body having a cavity and a flow passage intersecting the cavity. A seat ring is mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face. A gate in the cavity has an engaging face that slidingly engages the face of the seat ring while being moved between open and closed positions. A friction-resistant coating is on at least one of the faces.
Claims20
An apparatus for controlling well fluids, comprising:
- a gate valve having a body, the body having a cavity and a flow passage intersecting the cavity;
- a seat ring mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face formed of a steel alloy;
- a gate in the cavity and having an engaging face formed of a steel alloy that slidingly engages the face of the seat ring while being moved between open and closed positions;
- a hardened outer layer formed on at least one of the engaging faces of the gate and seat ring;
- and
- a friction-resistant coating on the hardened outer layer.
3 more elements
A method of forming a coating on a metal load bearing surface, comprising:
- (a) providing a gate valve assembly having a valve body with a cavity and a flow passage intersecting the cavity, a seat ring mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face formed of a steel alloy, and a gate in the cavity and having an engaging face formed of a steel alloy that slidingly engages the face of the seat ring while being moved between open and closed positions;
- (b) hardening at least one of the engaging faces;
- and
- (c) applying a friction-resistant coating to the hardened engaging face.
1 more element
A method of forming a coating on a metal load bearing surface, comprising:
- (a) providing a gate valve assembly having a valve body with a cavity and a flow passage intersecting the cavity, a seat ring mounted to the body at the intersection of the flow passage and the cavity, the seat ring having an engaging face formed of a steel alloy, and a gate in the cavity and having an engaging face formed of a steel alloy that slidingly engages the face of the seat ring while being moved between open and closed positions;
- (b) hardening at least one of the engaging faces;
- and
- (c) applying a coating selected from a group consisting of molybdenum disulfide and tungsten disulfide to the hardened engaging face until the coating has a thickness in a range between about 2 microns and about 8 microns.
1 more element
Dependencies are inferred from the claim text.