Control system

Details Control system Control system

1979-02-16

1980-10-07

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

137109, 137115, E21D 2312

Patent

active

042265584

ABSTRACT:
A control system for a hydraulically powered self advancing mine roof support, which system ensures that a hydraulically extensible chock leg of 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 sensing a higher predetermined pressure.

REFERENCES:
patent: 3168010 (1965-02-01), Thomas
patent: 3359043 (1967-12-01), Papin
patent: 3410295 (1968-11-01), Malott
patent: 3866623 (1975-02-01), Klimek

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