Air displacement apparatus for use with a fluid transfer device
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United States of America Patent
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Oct 13, 2009
Grant Date -
Oct 27, 2005
app pub date -
Apr 25, 2005
filing date -
Apr 23, 2004
priority date (Note) -
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Abstract
A liquid sealed air displacement apparatus may be used in a fluid transfer device to transfer volumes of fluid. The air displacement apparatus may include a piston and a cylinder defining a displacement chamber for receiving the piston. The air displacement apparatus may be used to displace precise volumes of air into the air displacement chamber. Displacing the air creates a negative pressure in the air displacement chamber (i.e., suction), which may cause a precise volume of fluid to be drawn into the fluid transfer device. The piston and the cylinder may define a diametrical clearance for receiving sealing fluid, which may prevent air leakage and wear.
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