为了能只用一根操纵杆操纵船用液压甲板起吊机械的所有动作,我们把六只嵌入式二通阀装在一块阀体上,组成起吊机械的主换向阀。由一根手柄操作即能控制起吊机械的起吊、回转、吊杆起落等全部动作。为防止负载自行滑落,并使起吊有二档速度以及在电源故障时对液压马达进行机械制动和锁定,系统 In order to be able to handle all the movements of a hydraulic deck hoist with only one joystick, we put six embedded two-way valves on one valve body to form the main reversing valve of the hoisting machine. By a handle operation that is able to control lifting crane lifting, slewing, boom movements and all movements. To prevent the load from slipping off and causing the second gear to be lifted and the hydraulic motor to be mechanically braked and locked in the event of a power failure, the system