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AssigneeNordson Corporation
InventorsMark W. McCollough, Joseph J. Karbowniczek
Estimating the term…
Chromium nitride coating of machine components such as reciprocating pump plungers for continuous sliding contact with non-metallic packing and gasket materials greatly increases the performance life of fluid seals. In an air driven reciprocating constant pressure pump, exterior surfaces of the pump plunger are coated with chromium nitride to a thickness of seven to ten microns. The coating resists failure from repeated sliding contact against non-metallic packing and gasket materials for at least four million pump cycles, with no evidence of cracking or release of metallic particles which would embed in the packing or gasket material and score the plunger. In lower pressure pumps, interior walls of a housing against which a sliding gasket bears, when coated with chromium nitride, greatly increase the seal life of the sliding gasket.
A reciprocating type fluid pump having a hydraulic section including a housing and a plunger driven to reciprocate at least partially within the housing and to pass through an opening in the housing,
In a fluid pump having a plunger which reciprocates at least partially within a hydraulic housing,
In a fluid pump having a plunger which reciprocates at least partially within a hydraulic housing, with an outer surface of the piston being in direct sliding contact with a non-metallic seal, the improvement comprising:
Dependencies are inferred from the claim text.