Valve seats and valve assemblies for fluid end applications
AssigneeKennametal Inc.
InventorsRoger M. Stark, Carrie Bartkowiak, John Brosnahan, Michael Kelly
Life of this patent
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Abstract
In one aspect, valve seats are described herein having structure and design addressing degradative stresses encountered by valve seats during installation and operation in fluid ends. In some embodiments, a valve seat for use in a fluid end comprises a first section for insertion into a fluid passageway of the fluid end and a second section extending longitudinally from the first section, the second section has an outer diameter greater than the outer diameter of the first section. The second section also comprises a frusto-conical valve mating surface, wherein the second section is encased in a ring imparting a compressive stress condition to the second section.
Claims28
A valve seat for use in a fluid end comprising:
- a first section for insertion into a fluid passageway of the fluid end;
- and
- a second section extending longitudinally from the first section, the second section having a compressive stress condition and an outer diameter greater than outer diameter of the first section and comprising a frusto-conical valve mating surface, wherein the second section is encased in a ring imparting the compressive stress condition to the second section and the first section comprises an outer surface for engaging the fluid passageway.
A valve assembly for use in a fluid end comprising:
- a valve in reciprocating contact with a valve seat, the valve seat comprising a first section for insertion into a fluid passageway of the fluid end and a second section extending longitudinally from the first section, the second section having a compressive stress condition and an outer diameter greater than outer diameter of the first section and comprising a frusto-conical valve mating surface, wherein the second section is encased in a ring imparting the compressive stress condition to the second section and the first section comprises an outer surface for engaging the fluid passageway.
A fluid end comprising:
- a suction fluid passageway and a discharge fluid passageway;
- and
- a valve assembly in at least one of the suction and discharge fluid passageways, the valve assembly comprising a valve in reciprocating contact with a valve seat, the valve seat comprising a first section for insertion into the suction or discharge fluid passageway and a second section extending longitudinally from the first section, the second section having a compressive stress condition and an outer diameter greater than outer diameter of the first section and comprising a frusto-conical valve mating surface, wherein the second section is encased in a ring imparting the compressive stress condition to the second section and the first section comprises an outer surface for engaging the fluid passageway.
A valve seat for use in a fluid end comprising:
- a first section for insertion into a fluid passageway of the fluid end;
- a second section extending longitudinally from the first section, the second section having an outer diameter greater than outer diameter of the first section and comprising a frusto-conical valve mating surface;
- and
- a ring encasing only the second section, wherein the second section comprises a compressive stress condition imparted by the ring.
Dependencies are inferred from the claim text.