What is the difference between single control solenoid valve and dual control solenoid valve

The single electric control valve has a coil, which changes to another state when energized, and automatically restores to the original state when it is not energized.

The double solenoid valve has two coils. One side is energized in one state, the state is maintained before the power is cut off, and the other side is energized and transposed to another state, and the power is cut off to keep the state before the cut off. The difference in application can be seen from the function.

If the valve commutation time is not long, you can choose single control> If the commutation time is long, then the coil needs to be energized for a long time. If the coil is energized for too long, it will generate heat and burn out the coil. In this case You can choose a dual control valve;> If you need to reset after power off, use a single electric control. If you need to keep after power off, then use a dual-control solenoid valve!

A. Single electric control principle

The single solenoid valve controls the movement of the spool by controlling the current on and off of the solenoid coil and the action of the spring to achieve the opening and closing of the control valve! The coil on the right side of the action diagram is energized, and the coil on the left side is compressed by the spring and the right coil is de-energized. Left spring extended

B. Principle of double electric control

The double electronically controlled solenoid valve controls the opening and closing through the power and loss of the solenoid coils on both sides. When one coil is de-energized and the other is not energized, the valve core can be kept in place, which is called a valve with memory function. The right side loses power, the left gets power, the right gets power, and the left loses power.