Vent for reducing seal pressure in pump assembly

Details Vent for reducing seal pressure in pump assembly Vent for reducing seal pressure in pump assembly

2006-11-21

2006-11-21

Stashick, Anthony D. (Department: 3746)

Pumps

With condition responsive pumped fluid control

Pressure responsive relief or bypass valve

C417S440000, C418S104000, C418S206100

Reexamination Certificate

active

07137789

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.

REFERENCES:
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patent: 4813853 (1989-03-01), Otto et al.
patent: 5244367 (1993-09-01), Aslin
patent: 5419686 (1995-05-01), Wissmann et al.
patent: 5482441 (1996-01-01), Permar
patent: 6123531 (2000-09-01), Blume et al.
patent: 41 25 128 (1992-02-01), None
patent: 0 785 361 (1997-07-01), None
patent: 2 172 339 (1986-09-01), None

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