Asking questions about solenoid valve power supply

Power supply conditions 4. 1 According to the type of power supply, AC and DC solenoid valves are selected respectively. Generally speaking, AC power is easy to access. 4.2 For voltage specifications, give priority to AC220V or DC24V. 4.3 Power supply voltage fluctuation is usually +%10%.-15% for AC, and ±%10 is allowed for DC. If it exceeds the tolerance, voltage stabilization measures must be taken or special ordering requirements must be made. 4.4 The rated current and power consumption should be selected according to the power supply capacity. It should be noted that the VA value is higher during AC starting. When the capacity is insufficient, the indirect pilot solenoid valve should be preferred.

AC power supply (AC220V) is easy to use, but it is not as safe as DC power supply (DC24V)

It depends on how the designer chooses. AC220V and DC24V each have their own advantages. AC220V is convenient, and DC24V is safe. However, DC24V has high requirements on relay contacts, because its electric shock current is large, so it is best to reversely connect a diode to the valve coil.

There are many types of voltages for solenoid valves, but the same type of solenoid head, or the same solenoid valve, can generally only respond to one voltage. I have been buying solenoid valves for many years, and at least I have never seen one solenoid valve that can respond to multiple voltages. As for the general category, generally speaking, 220V AC and 24V DC are used in the most situations. In addition, in some special occasions, I have encountered 220V DC and 24V AC. However, these situations are relatively rare and may be due to special process requirements. I do not have an in-depth understanding of this and cannot give you a reference. There are many other voltages such as 48V, 110V, etc. For special applications, what I currently know is that if the solenoid valve is used directly to control steam, due to the limitation of the insulation level, generally speaking, there is no DC, and the conventional one is 220V AC. I hope it will be helpful to you.

Design and Selection of Solenoid Valve The voltage of the solenoid valve control coil usually includes AC220V and DC24V. There are no strict design specification requirements for use. It is mainly based on the user's requirements. * Habits are related to the overall design configuration. I usually design and select DC24V solenoid valves. The main reason is: 1. Security: When instrument maintenance workers are not in normal working conditions (such as working with power, working overtime, late at night, etc.), the risk of electric shock accidents when using AC220V power supply is much greater than that of DC24V power supply. ； 2. Identity: In the automatic control devices I designed, all DC24V was selected. Based on the principle of identity, DC24V solenoid valves were continuously selected to avoid confusion and safety accidents. 3. Things to note: In the application of battery valves with DC24V power supply, attention must be paid to long-distance control solenoid valves, because when the distance is long, the line pressure loss must be calculated to avoid accidents in which the solenoid valve refuses to move due to insufficient driving force due to excessive line pressure loss.

Solenoid valve coil power supply: 24VDC: Smooth operation, small coil temperature rise, high power (generally large-diameter solenoid valves use 24VDC), and will not be disturbed by 220V AC 220VAC: Commonly used 110VAC: 220VDC: Power consumption: Foreign products can achieve low power consumption, but it is difficult to achieve low power consumption in China. It is said that it is a problem of the coil material. The same valve can be equipped with multiple coils of different voltages, but you must pay attention to the starting power of the solenoid valve, the height of the coil, and the diameter of the valve stem.