Hydraulic control apparatus

Motors: expansible chamber type – Fluid supply through diverse paths to single expansible chamber – Second path activated in response to pressure or flow in...

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91170MP, 91453, 91518, F15B 908

Patent

active

044857241

ABSTRACT:
Hydraulic control apparatus serves to operate roof support props of a mineral mining installation. An automatic setting arrangement with a valve device ensures the props become set against the roof with a high uniform force by connecting a prop pressure chamber to a pressure fluid source once a threshold pressure is exceeded signifying the prop has been extended. To disable the automatic setting arrangement during prop retraction the valve device thereof is provided with a control piston which is subjected to pressure during retraction to oppose the action of another control piston which responds to the threshold pressure.

REFERENCES:
patent: 4076210 (1978-02-01), Spielvogel
patent: 4391181 (1983-07-01), Weirich et al.

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