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US 8,561,523 B2Granted
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.
Claims20
A piston having a central axis and comprising:
- an annular hub having a first end, a second end, a throughbore extending axially between the first and second ends, and a radially outer surface;
- a flexible sealing element having a radially inner surface slidably engaging the radially outer surface of said hub, said sealing element having a lip;
- and
- a sleeve slidably engaging 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;
- wherein said hub further comprises a groove in the outer surface adjacent said sleeve and wherein a seal is disposed in the groove.
3 more elements
A piston rod assembly having a central axis, the assembly comprising:
- a piston comprising:
- an annular hub having a first end, a second end, a throughbore extending axially between the first and second ends, and a radially outer surface;
- a flexible sealing element coupled to the outer surface of the hub, the sealing element having a radially inner surface slidably engaging the radially outer surface of the hub, the sealing element having a lip and a front face comprising an angled portion and a substantially planar portion extending radially outward from the angled portion, wherein the surface area of the substantially horizontal portion is less than ten percent of the combined surface area of the substantially horizontal portion and the angled portion;
- and
- a sleeve having a radially inner surface slidably engaging the outer surface of the hub adjacent the sealing element, wherein the sleeve is configured to move axially relative to the hub and slidably engage the angled portion of the front face of the sealing element to compress the sealing element;
- wherein the lip of said sealing element is displaced radially outward when said sealing element is compressed by said sleeve;
- wherein said hub further comprises a groove in the outer surface adjacent said sleeve and wherein a seal is disposed in the groove;
- and
- a rod extending through the axial throughbore of the hub.
6 more elements
A pump comprising:
- a cylinder;
- and
- a piston moveably disposed within said cylinder, said piston having a central axis and comprising:
- an annular hub having a first end, a second end, a throughbore extending axially between the first and second ends, and a radially outer surface;
- a flexible sealing element coupled to the outer surface of the hub, the sealing element having a radially inner surface slidably engaging the radially outer surface of the hub, a lip, and an angled face;
- and
- a sleeve slidably engaging 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;
- wherein the lip of said sealing element is displaced radially outward when said sealing element is compressed by said sleeve;
- wherein said hub further comprises a groove in the outer surface adjacent said sleeve and wherein a seal is disposed in the groove.
7 more elements
Dependencies are inferred from the claim text.