Control valve

Details Control valve Control valve

1997-09-18

1998-12-29

Richter, Sheldon J.

Power plants

Pressure fluid source and motor

Condition responsive control of pump or motor displacement

60422, F15B 1302

Patent

active

058529357

ABSTRACT:
The invention concerns a control valve with a housing, having a pump connection, a tank connection device, a working connection device and a load pressure connection device, each connected with an opening device in a control surface, and with a slide, arranged movably in the housing and co-operating with the control surface, the slide having grooves and/or channels, so that it connects or separates predetermined opening devices with/from each other. In such a control valve the tightness must be improved. For this purpose an additional auxiliary tank connection device is provided, which is connected with an auxiliary tank opening device in the control surface. The slide has an auxiliary tank pipe or groove, which, in its neutral position, connects the auxiliary tank opening device with the load pressure opening device.

REFERENCES:
patent: 5279121 (1994-01-01), Barber
patent: 5673557 (1997-10-01), Yoshida et al.

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