Valve control system for an air displacement type pump
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United States of America Patent
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Apr 30, 1991
Grant Date -
N/A
app pub date -
Apr 5, 1990
filing date -
Apr 5, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A valve control system for an air displacement type pump operates the inlet or outlet valve in accordance with the pressure differential between the inlet line and the main pump chamber or the outlet line and the main pump chamber respectively such that the inlet valve is open when the pressure in the pump chamber is less than the pressure in the inlet line and the outlet valve is opened when the pressure in the chamber is greater than the pressure in the outlet line.
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