MULTI-WAY VALVE, HYDRAULIC DEVICE AND CONCRETE PUMP VEHICLE

摘要

A multi-way valve includes a plurality of parallel combination valves for controlling corresponding actuators (4-1-4-5). Each combination valve comprises a proportion throttle valve (2-1-2-5) and a reversing valve (3-1-3-5). An oil inlet of the proportion throttle valve is communicated with an oil main inlet (P), and an oil outlet of the proportion throttle valve is communicated with an oil inlet of the reversing valve. An oil outlet of the reversing valve is communicated with the oil main return port (T). Wherein, each combination valve also comprises an one-way control valve (9-1-9-5, 10-1-10-5) for obtaining the load pressure of corresponding acturator. One side of the one-way control valve is communicated with a pipeline between the proportion throttle valve and the actuator. The multi-way valve also includes a control element (8) which receives the load pressure fed back by each one-way control valve and reponds to the load pressure to control the supply of hydraulic oil for the actuators. The multi-way valve has the function of load sensitiveness, thereby reducing energy loss and system heat. A hydraulic equipment and a concrete pump vehicle corresponding to the multi-way valve are also provided.