Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
April 3, 2012
Patent Application Number
12390517
Date Filed
February 23, 2009
Patent Citations Received
Patent Primary Examiner
Patent abstract
Tapered valve guide and spring retainer assemblies are described for use in plunger pump housings that incorporate corresponding outwardly flared discharge and suction bores, as well as structural features for stress-relief. Plunger pumps so constructed are relatively resistant to fatigue failure because of stress reductions, and they may incorporate a variety of valve styles, including top and lower stem-guided valves and crow-foot-guided valves, in easily-maintained configurations. Besides forming a part of valve guide and spring retainer assemblies, side spacers may be shaped and dimensioned to improve volumetric efficiency of the pumps in which they are used.
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