Pumps – With condition responsive pumped fluid control – Fluid flow rate responsive
Patent
1979-12-10
1981-11-03
Gluck, Richard E.
Pumps
With condition responsive pumped fluid control
Fluid flow rate responsive
417302, 417304, F04B 4900
Patent
active
042983150
ABSTRACT:
A positive displacement pump system provides first and second delivery 11, 12 passages of which the first passage 11 communicates with a main discharge passage 15 containing a discharge orifice 17. The second delivery passage 12 opens to a valve bore and is in permanently open communication with the first delivery passage through an axial passage 29 in a valve member 20 slidably mounted in the valve bore. Lifting of the valve member with increasing pressure drop across the orifice 17 places the first delivery passage in communication with an overspill port 14. The pressure at the upstream and downstream sides of the orifice are applied against the lower end and the upper end 28 of the valve member so that the valve operates to maintain the pressure difference constant. The pressure difference between passage 29 and that applied against the upper end 28 of the valve member is therefore also substantially constant, so that leakage from passage 29 past the upper end 28 is constant. A variable effect does not have to be allowed for, therefore, and manufacturing tolerances can be widened.
REFERENCES:
patent: 2755741 (1956-07-01), Erskine
patent: 3384020 (1968-05-01), Searle
patent: 3985472 (1976-10-01), Virtue et al.
patent: 4002027 (1977-01-01), Eley et al.
Bristow Ian T.
Petts Nigel J.
Gluck Richard E.
Hobourn-Eaton Limited
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