The main function of mobile directional control valves is to turn on and off the oil circuit or switch the direction of the oil flow to meet the requirements for the start, stop and movement direction of the actuator. According to their use, it can be divided into two categories: check valves and directional valves.
Check valves, also known as check valves, have the function of making oil flow only in one direction. According to the different spool structure, check valves can be divided into two types: ball valve type and poppet valve type. Fig. 5-1 shows the structure of two check valves and the symbol of the check valve. The ball valve type spool has a simple structure, but it is easy to deteriorate the sealing due to friction, and is only used in low-pressure occasions. The poppet valve type is more used and has good sealing. According to the channel situation in the valve, it can be divided into straight type and right angle type. The straight-through fluid flow resistance is small, and it is more convenient to replace the spring, and the tube connection is generally used; The right-angle version can be connected in a tube. It can also be connected by plate type or flange. The main function of the spring in check valves is to help the valve close quickly when no oil flows through or oil back flows. But it also increases the resistance when the valve is opened and becomes a major part of the pressure loss when the oil flows through the check valve. While not affecting the sensitivity and reliability of the valve, the spring should be made softer. 'Generally, the opening pressure of the check valve is 0.035~0.05MPa, and the pressure loss when the total flow is passed is about 0.1~0.3MPa. In some cases, a check valve is required to allow the oil flow to pass in the opposite direction, in which case a hydraulically controlled check valve is used. The hydraulic control check valve is mainly composed of two parts: right angle check valve and control piston.The function of the directional valve is to use the relative movement of the spool and the valve body to turn on, close the oil circuit or change the flow direction of the oil to the actuator, so that the actuator starts, stops or changes the direction of movement. The directional valve is divided into rotary valve type and spool valve type according to the structure;
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