Hydraulic solenoid valve is through the coil power or not to control the spool of the internal action, and then control the hydraulic oil circuit of hydraulic products. The main components are the coil, solenoid, and action spool.
The solenoid coil forms an electromagnetic force when energized, which then drives the solenoid, causing the spool to move accordingly. The limited electromagnetic force theoretically imposes an upper limit on the force pushing the spool, which in turn affects the maximum flow rate and maximum pressure of the hydraulic valve.
Many people assume that solenoid operated directional valves can achieve the nominal maximum pressure and maximum flow rate simultaneously. However, in reality, some solenoid valves do not operate properly at the maximum flow rate or maximum pressure.
This happens because the nominal maximum flow rate and maximum pressure do not actually determine the power limit of each solenoid valve.
Here, we will introduce the concept of the “power domain.” The maximum power of a fixed solenoid is a constant value. The solenoid force will also have a maximum value. In most cases, the maximum solenoid force does not guarantee that the solenoid valve will operate at maximum pressure. It also does not ensure that the valve will achieve maximum flow.
The figure below shows the SUN solenoid directional valve DWDF-*A*. If the liquid flow direction is from port 2 to port 1, the valve will have a slash area in the power domain. That means the valve can only keep working normally within the power domain. Note: Different liquid flow directions change the power domain. Additionally, the power domain varies depending on whether the valve is normally closed or normally open.
So, the next time you choose a hydraulic solenoid valve, make sure to check the power domain of the solenoid valve. It is crucial to ensure proper operation and performance. If it is a three-position four-way solenoid directional valve, its neutral function will also affect the power domain. The power domain will not be the same in this case. The following figure shows the power domain curve of each different spool of SUN three-position four-way solenoid directional valve DNCA.
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