Hydraulic control circuit design and analysis

The working principle of the application circuit of the device is shown in Figure 1. It can be used for automatic filling of household tap water. Nowadays, urban water use is relatively tight, and it is even more difficult for residents in high-rise buildings to use water. Often, only in the middle of the night when other people's homes do not need water, a small amount of water is pressed up to the high-rise buildings. However, people need to sleep and cannot always wait for water filling. With this circuit, you can sleep at ease. When the water level in the pool is lower than probe B, a current flows from the ① end of the controller DM through the resistor R to the ④ end. The controller is turned on, the solenoid valve YA is excited and attracted, and the faucet is turned on. When water is pressed up, it automatically flows into the pool. Once the water pollution is filled and the water level reaches the height of probe B, the resistance between the B and A probes and the R voltage divider make the voltage at the ④ end of the controller lower than 1.6V, so YA loses power and releases, and the faucet is automatically turned off. In this way, there is no need to worry about running out of water when you wake up the next morning. The A and B probes can be made of stainless steel.