Control valve arrangements for variable stroke pumps

Details Control valve arrangements for variable stroke pumps Control valve arrangements for variable stroke pumps

1976-09-22

1978-02-07

Freeh, William L.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60452, F04B 4908

Patent

active

040724433

ABSTRACT:
A control valve arrangement for regulating a servo pressure which in turn controls the stroke of a variable displacement pump has a control element positioned by means of an operating pressure derived from the pressure at the pump outlet. A solenoid valve is operable to reduce the operating pressure and thereby to position the control element so as to cause the pump stroke to be reduced. Movement of the control element beyond a predetermined position in a pump stroke reducing direction opens a bypass connection which maintains a small cooling flow through the pump.

REFERENCES:
patent: 3067693 (1962-12-01), Lambeck
patent: 3732041 (1973-05-01), Beal et al.
patent: 3768928 (1973-10-01), Miller et al.
patent: 3784326 (1974-01-01), Lagana et al.
patent: 3784327 (1974-01-01), Lonnemo
Fluid Power Manual #1211 A, Delavan Manufacturing Company, 1969, p. 6, figure 2(right).

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