Valve arrangement for driving powered cylinder of stope supporting structure in underground mines, has damping valve provided between pressure connection and cylinder connection, and comprising throttle

摘要

The valve arrangement (12) has a releasable non-return valve (14) provided between a pressure connection (PB) and a cylinder connection (B). A damping valve (18) comprising a throttle (16) is provided between another pressure connection (PA) and another cylinder connection (A). A control line (20) of the non-return valve is connected with the latter pressure connection. A throttle non-return valve (24) is arranged in the control line. A control line (32) of the damping valve is connected with the latter cylinder connection.