Pumps – With condition responsive pumped fluid control – Pressure responsive relief or bypass valve
Patent
1989-12-04
1991-08-20
Smith, Leonard E.
Pumps
With condition responsive pumped fluid control
Pressure responsive relief or bypass valve
417286, 417287, F04B 2102, F04B 2306
Patent
active
050409514
ABSTRACT:
An oil pump includes a pair of pump cartridges, one of which can be unloaded. Oil which is discharged from one of the pump cartridges is supplied to an accumulator through a supply passage in which an orifice is provided. The orifice is opened and closed in response to a pressure which prevails in the accumulator. A spool is operated upon by a pressure differential across the orifice to return the discharged oil to the suction side of the pump. A clearance is formed between the outer surface of the spool and the inner surface of the valve opening in which the spool is fitted, permitting the oil in a chamber into which a pressure prevailing downstream of the orifice is introduced to be returned to the return path.
REFERENCES:
patent: 2280392 (1942-04-01), Herman et al.
patent: 2700397 (1955-01-01), Compton
patent: 4412789 (1983-11-01), Ohe et al.
H. L. Stewart, Practical Guide to Fluid Power; Jun. 1968; p. 430.
Jalali Laleh
Jidosha Kiki Co. Ltd.
Smith Leonard E.
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