Valve arrangement for plunger of support frame in mining industry, has check valves connected at output side with piston surface line of plunger, where inputs of check valves are connected with return line and/or control line, respectively

摘要

The arrangement has a set of parallel switched unlockable check valves (24, 26), where inputs of the check valves is connected with a return line (R) and a control line (A1) of a valve, respectively. The valve is connected at an output side with a piston surface line (A') of a plunger (10). A set of parallel switched unlockable check valves (22, 28) is connected at the output side with the piston surface line of the plunger, where inputs of the check valves (22, 28) are connected with the return line and/or a control line (A2) of the valve, respectively.