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US 2010/0074780 A1Published application
A Reciprocating Pump Having a Piston Assembly
AssigneeNational Oilwell Varco, L. P.
InventorsAndrew Dale Riley, Randall Ferrain Weaver
Life of this patent
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Abstract
A reciprocating pump including a piston is disclosed. In some embodiments, the piston includes an annular hub, a flexible sealing element coupled to an outer surface of the hub, and a sleeve seated on the outer surface of the hub adjacent the sealing element. The sleeve is axially moveable relative to the hub to compress the sealing element. The sealing element includes a lip, which is displaced radially outward when the sleeve compresses the sealing element.
Claims21
A piston comprising:
- an annular hub having an outer surface;
- a flexible sealing element coupled to the outer surface of said hub, said sealing element having a lip;
- and
- a sleeve seated on the outer surface of said hub adjacent said sealing element and axially moveable relative to said hub to compress said sealing element;
- wherein the lip of said sealing element is displaced radially outward when said sealing element is compressed by said sleeve.
2 more elements
A piston rod assembly comprising:
- a piston having an axial throughbore, the piston comprising:
- an annular hub having an outer surface;
- a flexible sealing element coupled to the outer surface of the hub, the sealing element having a front face, the front face comprising an angled portion and a substantially vertical portion, wherein the surface area of the vertical portion is less than ten percent of the combined surface area of the vertical and angled portions;
- and
- a sleeve seated on the outer surface of the hub adjacent the sealing element and axially moveable relative to the hub to compress the sealing element over the angled portion of the front face of the sealing element;
- and
- a rod inserted through the axial throughbore.
4 more elements
A pump comprising:
- a cylinder;
- and
- a piston moveably disposed within said cylinder, said piston comprising:
- an annular hub having an outer surface;
- a flexible sealing element coupled to the outer surface of the hub, the sealing element having an angled face;
- and
- a sleeve seated on the outer surface of the hub adjacent the sealing element and axially moveable relative to the hub to compress the sealing element, the sleeve having an angled face substantially parallel to the angled face of the sealing element and in contact with the angled face of the sealing element;
- wherein an angle between a normal vector extending from the angled face of the sealing element and a line extending from the angled face of the sealing element and parallel to a longitudinal axis of the piston is acute.
5 more elements
Dependencies are inferred from the claim text.