Control system

Details Control system Control system

F - Mech Eng,Light,Heat,Weapons

15

B

138/80.13

F15B 20/00 (2006.01)

Patent

CA 1092946

ABSTRACT OF THE DISCLOSURE A control system for a hydraulically powered self advancing mine roof support, which system ensures that a hydraulically extensible chock leg Or the support is set to a predetermined pressure, irrespective of the length of time that a main inlet valve is held open comprises an auxiliary valve interposed between a main valve and a chock leg(s) in a fluid supply line extending from a high pressure line to the support, a bypass line connected to the high pressure line in advance of the main valve and extending to the auxiliary valve, the auxiliary valve being so constructed as to open upon sensing a predetermined pressure and to close upon sending a higher predetermined pressure.

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