Pressure and volume-flow control for variable pump

Details Pressure and volume-flow control for variable pump Pressure and volume-flow control for variable pump

1976-11-12

1979-01-02

Croyle, Carlton R.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

60450, 60452, 417 53, F04B 4900

Patent

active

041325060

ABSTRACT:
A hydraulic system has a pump whose outlet is connected to a load and which has a pilot port whose pressurization is proportional to the pressure at the outlet. A restriction is provided between the outlet of the pump and the load. A differential valve is provided connected to the conduit between the pump and the load to both sides of the restriction and serves to compare the difference between pressure upstream and downstream of this restriction with a set point so as to depressurize the pilot port of the pump when this difference exceeds the set point. Furthermore, another valve is provided which compares the pressure in the feed conduit downstream of the restriction through yet another set point and also serves to depressurize the pilot port when this downstream pressure exceeds the second set point.

REFERENCES:
patent: 2823614 (1958-02-01), Lapsley
patent: 2865397 (1958-12-01), Chenault
patent: 3067693 (1962-12-01), Lambeck
patent: 3623321 (1971-11-01), Schwerin
patent: 3635021 (1972-01-01), McMillen et al.
patent: 4035105 (1977-07-01), Dantlgraber

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