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US 9,435,454 B2Granted
Fluid end with carbide valve seat and adhesive dampening interface
OwnerGeorge H Blumeinventor
Life of this patent
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Abstract
A tungsten carbide seat for high-pressure oilfield well service pumps is disclosed. A bonding agent, in conjunction with an interference tapered fit between the valve seat and fluid end housing eliminates stresses created in prior art interference fits. Three interface embodiments are disclosed: a shallow taper combined with a shoulder, a steep taper without a shoulder, and a compound surface in which the seat has an external concave surface and the housing surface that mates with the seat has a convex surface.
Claims15
A fluid end assembly comprising:
- a fluid end housing;
- a valve body;
- a valve seat, wherein said valve seat is formed with a cemented tungsten carbide;
- wherein:
- said valve body comprises a first mating surface configured to be received in a nested position against a second mating surface on said valve seat in response to compressive fluid pressure;
- said valve seat further comprises a third mating surface that is secured by a bonding agent to a fourth mating surface on said fluid end housing, wherein said third and fourth mating surfaces comprise first and second complementary tapers, respectively, and wherein said bonding agent is evenly distributed between said third and fourth tapered mating surfaces by pressure applied to said valve seat during insertion of said valve seat into said fluid end housing;
- and
- said bonding agent is operable to absorb a portion of said compressive fluid pressure on said valve body when said valve body is compressed in said nested position by said compressive fluid pressure.
5 more elements
A fluid end assembly comprising:
- a fluid end housing;
- a valve body;
- a valve seat, wherein said valve seat is formed with a cemented tungsten carbide;
- wherein:
- said valve body comprises a first mating surface configured to be received in a nested position against a second mating surface on said valve seat in response to compressive fluid pressure;
- said valve seat further comprises a third convex mating surface that is secured by a bonding agent to a fourth concave mating surface on said fluid end housing, wherein said third convex mating surface and fourth concave mating surfaces comprise first and second complementary tapers, respectively, and wherein said bonding agent is evenly distributed between said third convex mating surface and said fourth concave mating surface by pressure applied to said valve seat during insertion of said valve seat into said fluid end housing;
- and
- said bonding agent is operable to absorb a portion of said compressive fluid pressure on said valve body when said valve body is compressed in said nested position by said compressive fluid pressure.
5 more elements
Dependencies are inferred from the claim text.