(1) Function:
Main control valve or multi-way valve, it is a combination valve composed of more than two reversing valves. According to the requirements of different systems, it is common to combine relief valves (safety valves), check valves, overload valves, charge valves, etc., which play a role in safety protection.
Control the flow, pressure and direction of hydraulic oil.
(2) The working process of single valve
Single valve working process
When there is no pilot oil on both sides of the main spool, the main spool is in the neutral position under the action of the return springs at both ends. The neutral function of the main valve (that is, the entire directional valve) is determined by the structure of the main spool. If pilot oil is passed to the left end of the pilot valve, the main spool moves to the right, so that the P port of the main spool communicates with the A port, and the T port communicates with the B port; when the right end of the pilot valve communicates with pilot oil, the main spool moves to the left The P port of the main review is connected to the B port, and the T port is connected to the A port.
