Change-over valve for hydraulic walking mine-roof supports

Details Change-over valve for hydraulic walking mine-roof supports Change-over valve for hydraulic walking mine-roof supports

1986-11-14

1988-07-19

Michalsky, Gerald A.

Fluid handling

Self-proportioning or correlating systems

Self-controlled branched flow systems

91 33, 91447, F15B 1304

Patent

active

047578351

ABSTRACT:
A change-over valve for hydraulic walking mine-roof supports comprises a valve housing containing a sealed-off operating piston in which a valve member supported on a helical spring is displaceably arranged, the piston being responsive to the supply of small quantities of hydraulic fluid through an end connection in the housing and having a sealing cone adapted to close a connection of large throughflow cross-section at the opposite end of the housing which also has a side connection for the supply of pressurized fluid to a working cylinder of a mine-roof support, the large throughflow cross-section at the connection thereby guaranteeing brisk pushing-in of a piston rod of a piston in the cylinder.

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