On-off pressure cutoff control for a variable displacement hydra

Details On-off pressure cutoff control for a variable displacement hydra On-off pressure cutoff control for a variable displacement hydra

1992-01-16

1993-03-30

Smith, Leonard E.

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

4172221, F04B 126

Patent

active

051978644

ABSTRACT:
High pressure cutoff controls are useful for variable displacement hydraulic pumps for reducing power losses at high pressure levels. Some operators, however, believe that they get more work from pumps not having the high pressure cutoff control. The subject on-off high pressure cutoff control includes an on-off valve disposed in a pilot passage connected to an output port of a pump and to an end of a high pressure cutoff valve. The on-off valve is selectively movable between a first position at which pressurized fluid passes through the pilot passage to the end of the high pressure cutoff valve to prevent it from functioning as a high pressure cutoff valve. Thus, an operator has the option of operating the hydraulic pump with or without the high pressure cutoff control.

REFERENCES:
patent: 4523430 (1985-06-01), Masuda

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