F - Mech Eng,Light,Heat,Weapons – 15 – B
Patent
F - Mech Eng,Light,Heat,Weapons
15
B
138/80.13
F15B 21/00 (2006.01)
Patent
CA 1142414
ABSTRACT Hydraulic control apparatus serves to operate roof support props of a mineral mining installation and employs a manually-operable main valve device which can be set to various positions to selectively connect fluid pressure and return lines to the working chamber of at least one associated prop to thereby cause extension and retraction of the prop. A pressure-relief valve device is connected to the particular prop chamber charged with pressure fluid by the main valve device to effect extension of the prop. The relief valve device is automatically set by pressure control means to respond to a significantly higher pressure whilst the prop is actually being extended and set by the main device and reverts back to its normal response pressure once the prop is set.
409547
Bechmann Klaus
Grisebach Hans-Theodor
Weirich Walter
Gewerkschaft Eisenhutte Westfalia
Macrae & Co.
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