Inherently flushing piston rod for a reciprocating pump
This patent describes an inherently flushing piston rod for use in a reciprocating pump. It comprises: a piston portion having an axial bore formed therethrough, the axial bore having a first end and a second end, the first end of the axial bore lying in fluid contact with the external environment of the piston portion; a flexible diaphragm disposed within the axial bore through the piston portion whereby the flexible diaphragm and the piston portion define a reserve flushing zone; a pair of annular wiper elements extending radially from the piston portion, the annular wiper elements and the piston portion defining an annular flushing space therebetween; the piston portion having a radially-extending channel formed therethrough, the radially-extending channel fluidly connecting the axial bore through the piston portion and the annular flushing space; and a means for providing flushing fluid to the second end of the axial bore through the piston portion; a means for preventing flow from the axial bore through the piston portion to the means for supplying flushing fluid.
- Assignee:
- Dresser Industries, Inc., Dallas, TX (USA)
- Patent Number(s):
- US 4965042; A
- Application Number:
- PPN: US s 7-474156
- OSTI ID:
- 6470370
- Resource Relation:
- Patent File Date: 2 Feb 1990
- Country of Publication:
- United States
- Language:
- English
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