Vent for reducing seal pressure in pump assembly
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United States of America Patent
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Nov 21, 2006
Issued Date -
N/A
app pub date -
Apr 7, 2003
filing date -
Jul 18, 1997
priority date (Note) -
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Abstract
An engine pump is provided which operates with an internal combustion engine or as a supplemental pump or as used in a stand alone device, and includes an internal vent for improved pump and motor durability. The pump is operably and sealably connected to a motor and adapted for connection with a source of fluid and a discharge means. An internal vent is positioned in between an armature shaft of bore along an inlet port thereby decreasing the pressure in the area of the seal. Alternatively, a valve is positioned between the inlet and outlet ports to selectively permit fluid pumped between the inlet and outlet ports to pass through when the outlet port is flow restricted.
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