Selection of hydraulic solenoid change-over valve
As a common hydraulic control element, the hydraulic solenoid change-over valve has many model specifications. Flow, control mode, function, voltage and other specifications should be considered when selecting the type.
The following factors should be considered in the selection:
1. Control mode
Hydraulic solenoid change-over valves are generally divided into electromagnetic and manual control modes, which should be selected according to the convenience of operation and the level of system automation.
2. Pressure and Flow
The pressure and flow rate of the hydraulic solenoid change-over valve shall meet the following requirements:
The working pressure and flow rate of the system should be less than the rated working pressure and flow rate of the valve, otherwise the operation will be abnormal.
The rated flow of solenoid change-over valve is relatively small. When the system flow exceeds the rated flow, the electro-hydraulic change-over valve should be selected.
Back pressure at outlet T must not exceed the maximum allowable value, otherwise the solenoid change-over valve will be difficult to change direction.
3. Spool function
The different reversing functions of the solenoid hydraulic change-over valves are realized by different spool designs. The correct function of the spool should be selected according to the working requirements of the Hydraulic System.
4. Commutation accuracy and smoothness
When working ports A and B are both plugged, commutation is prone to hydraulic shock, but the commutation accuracy is high. When ports A and B are connected with the return port, the actuating element is not easy to brake during commutation, but the hydraulic shock is small.
5. Start-up smoothness
The starting performance of solenoid hydraulic change-over valves with different neutral functions is different. If a chamber of the Hydraulic Cylinder is connected with the oil tank in the neutral position, it is easy to cause uneven starting due to the absence of hydraulic oil as a buffer during starting.
The above are several aspects to be paid attention to when selecting the hydraulic solenoid change-over valve.