Fluid handling – Line condition change responsive valves – Direct response valves
Patent
1991-12-31
1993-10-05
Nilson, Robert G.
Fluid handling
Line condition change responsive valves
Direct response valves
137902, 251334, 251359, F16K 1506
Patent
active
052496007
ABSTRACT:
An improved valve seat which significantly decreases the impact stress caused by the impact of a mud pump valve body against the valve seat. The valve seat comprises a generally cylindrical body portion with a sealing surface which is sloped from the outer surface of the cylindrical body portion toward an interior throat of said cylindrical body portion. The valve body comprises a generally disc-shaped portion and a truncated conical portion. An elastomer insert is received in a groove in the valve body. The conical portion of the valve comprises a sloped face, including a metal portion and an elastomeric portion formed by the elastomeric insert. In the valve seat of the present invention, an annular pressure relief groove in the cylindrical body portion of the valve seat allows the sloped face of the valve seat to flex thereby relieving a significant amount of the impact load between the opposing face of the valve assembly.
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