Valve arrangement for a walking mine roof support

Details Valve arrangement for a walking mine roof support Valve arrangement for a walking mine roof support

1978-11-27

1980-09-02

Taylor, Dennis L.

Hydraulic and earth engineering

Earth treatment or control

Ground stabilization or reinforcement

E21D 1544

Patent

active

042204240

ABSTRACT:
A valve arrangement for operating a walking mine roof support so as to automatically move the props of the mine roof support first to a collapsed position and advancing the mine roof support and only thereafter moving the props to their extended position and in which control of the valve arrangement is carried out with the pressure fluid which acts on the members of the walking mine roof support.

REFERENCES:
patent: 3309880 (1967-03-01), Potts et al.
patent: 3631681 (1972-01-01), Taylor

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