Well pump
Patent
·
OSTI ID:6069947
A pump is described comprising a pump cylinder, a piston within the cylinder, an entrance for fluid below the piston, an outlet above the piston, and means for raising and lowering the piston, the piston comprising a cylindrical body or organic polymer having a diameter such as to fit closely in the cylinder, the piston including a first check valve so constructed and arranged as to permit flow of fluid only upwardly through and relative to the body; the body comprising radially flexible flanges extending upwardly and downwardly from its periphery and extending completely about the periphery in close-fitting engagement with the cylinder; the first check valve comprising a substantially planar screen having numerous closely spaced small openings on the top of the body and a thin, flexible disc of organic polymeric material fixed on the upper surface of the planar screen and substantially covering the area bounded by the upwardly extending flange; the body being provided with a cavity immediately below and covered by the planar screen member and at least one passage extending from the cavity to the bottom of the body.
- Assignee:
- Battelle Development Corp., Columbus, OH
- Patent Number(s):
- US 4688999
- OSTI ID:
- 6069947
- Country of Publication:
- United States
- Language:
- English
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