Reciprocable piston with a fluid scavenging system and method of scavenging a fluid
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United States of America Patent
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Oct 10, 2006
Grant Date -
Aug 18, 2005
app pub date -
Mar 26, 2003
filing date -
Mar 28, 2002
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A reciprocable piston comprises a cylindrical body reciprocable within a hollow cylinder and at least two spaced ring seals disposed around the circumference of the cylindrical body. Within the cylindrical body there is a scavenging system that comprises: an internal chamber that is in fluid communication with a space between the spaced ring seals; and a one-way fluid passage that allows one-way fluid flow from the internal chamber to the cylinder chamber when fluid pressure within the internal chamber is greater than fluid pressure within the cylinder chamber. A method of scavenging fluid comprises collecting fluid that leaks by a piston seal and returning the collected fluid to the cylinder chamber from which it originated, through a scavenging system disposed within the piston.
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