The automatic water supply function is one of the signs of maturity and humanization of solar water heater products, and the solenoid valve is one of the key components that can realize the automatic water supply function, which is increasingly valued by manufacturers and consumers. This article discusses the structure and use of solenoid valves from a simple and practical perspective, hoping to arouse everyone's discussion and attention.

　　The solenoid valves used in the current water supply system of solar water heaters are all pilot solenoid valves, which have been used in washing machines, dishwashers and other household appliances industries for more than 20 years, indicating that they are relatively mature and reliable. The valve body of this kind of valve is divided into upper and lower chambers by a rubber flap with two small holes. The small holes on the edges are called pilot holes and the small holes in the middle are called pressure relief holes. To open or close the pressure relief hole, change the pressure of the upper and lower chambers of the valve body to obtain the pressure difference to push the rubber diaphragm to switch the valve. This structure has two characteristics: one is that the on-off valve is obtained by using the pressure difference of the water itself, without mechanical wear, simple and reliable control, low power consumption, and long life; the other is that the on-off valve must have a minimum water pressure and the water inlet must Add a filter device to filter out particles or suspended matter that may block the pores. In order to facilitate the use of solar water heaters, ordinary solenoid valves add a check device in the valve body, which also uses water pressure to check. The engineers and technicians of Sangle Solar Energy R&D Center put a lot of effort into the development and improvement of this kind of valve. Today, this type of solenoid valve has become a mainstream accessory product for automatic water supply.

　　Combined with the above characteristics, the solenoid valve should pay attention to the following points during installation and use:

1. The minimum switching water pressure of this kind of valve is 0.02 MPa (about 2 meters high water pressure. Because even the top-floor users, the height difference between the water heater tank and the nozzle is generally more than 2 meters, to ensure that the valve can be opened), if the water pressure is not enough, It is recommended that users install a booster pump. Users who have long-term low water pressure should inform that the water supply time may be prolonged.

　　 2. Before installation, check whether the outside of the solenoid valve is damaged, whether there are cracks, whether the filter is intact, whether there is damage or looseness, so you need to replace the filter. Pipes, especially metal pipes, must be flushed with water first to prevent dirt in the pipes from being blocked or affecting the switching effect and flow of the solenoid valve.

　　 3. When installing, distinguish the water inlet and outlet ends of the solenoid valve according to the markings. When screwing the threaded joints, they must be correct to avoid rough and brutal force that may affect the joint seal or even damage the valve body.

　　 Fourth, prevent the power cord from being loose, which may cause poor contact or short circuit. After installation, start the solenoid valve several times, hold the coil in your hand, and judge whether the magnetic coil is working normally (there will be slight vibration in normal). After the test is successful, install the protective cover to prevent it from loosening and falling off.

　　 5. The solenoid valve is best installed in a hidden place that is usually out of touch.

　　 6. After using for a period of time, if the water supply takes a long time or cannot be watered, remove the solenoid valve first, check whether the filter is blocked, and then check whether the wiring and power supply are normal, and take corresponding measures according to the actual situation.

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