Positive displacement pump including an unloading device
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United States of America Patent
Stats
-
Sep 28, 2021
Grant Date -
Sep 19, 2019
app pub date -
Jun 3, 2019
filing date -
Apr 27, 2016
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A fluid transfer pump that has a housing, a body portion movable within the housing between a first position and a second position, a gear coupled to the housing, a body cavity defined partially between the body portion and the housing, and an aperture defined in the housing that selectively provides a fluid to the body cavity. When the fluid is applied to the body cavity at or above a pilot pressure, the body portion is in the first position adjacent to the gear and when the fluid is applied to the body cavity at a fluid pressure lower than the pilot pressure, the body portion is in the second position and spaced from the gear.
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