Regulatory device comprising a threshold valve control valve

Details Regulatory device comprising a threshold valve control valve Regulatory device comprising a threshold valve control valve

2008-03-11

2008-03-11

Kramer, Devon C. (Department: 3746)

Pumps

Condition responsive control of drive transmission or pump...

Adjustable cam or linkage

C417S212000

Reexamination Certificate

active

10505208

ABSTRACT:
The invention relates to a regulatory device for a pump (2), whose delivery volume can be adjusted, said device comprising a control valve unit (3) for regulating a control pressure that operates in a control pressure chamber (21) of an actuator (4, 5). The control valve unit (3) comprises a threshold value control valve (22) and a delivery flow control valve (23). The threshold value control valve (22) is subjected to a pressure from a working line (7) on the delivery side and the delivery flow control valve (23) can be subjected to a consumer input pressure taken from a consumer supply line (8), at a comparison pressure connection (29). In addition, the delivery flow control valve (23) is subjected to a control pressure that counteracts the consumer input pressure, at a regulatory pressure measurement connection (27). A control pressure feed connection (38) of the delivery flow control valve (23) can be connected to the working pressure line (7) on the delivery side in a variable manner, by means of the threshold value control valve (22).

REFERENCES:
patent: 4810171 (1989-03-01), Krebs
patent: 6311489 (2001-11-01), Stangl et al.
patent: 43 29 164 (1995-03-01), None
patent: 100 06 659 (2001-08-01), None

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