Hydraulically operated mine roof support and a control arrangement thereof

A mine roof support installation including a hydraulically operated mine roof support having first consumers which require a small amount of a working medium per time unit and second consumers which require a large amount of the working medium per time unit;

• a neighboring mine roof support located adjacent to said first-mentioned mine roof support;
• first control means for said first consumers which require a small amount of a working medium per unit time, said first control means including a first bundle of hoses having a relatively small inner diameter for passing the working medium and arranged to select and to apply pressure to the first consumers directly from said neighboring mine roof support;
• and second control means for all second consumers which require a large amount of the working medium per unit time, said second control means including a second bundle of hoses extending between said first-mentioned mine roof support and said neighboring mine roof support, main control valves which are indirectly remotely controlled through said second bundle of hoses and arranged to select said second consumers, and conduits extending between said second consumers and said main control valves and arranged to apply pressure to the former, said further conduits having an inner diameter which exceeds the inner diameter of the hoses of said bundles.