What is the difference between a single control solenoid valve and a double control solenoid valve?

What is the difference between a single control solenoid valve and a double control solenoid valve?

The single electronically controlled valve has a coil, which changes to another state when energized, and automatically returns to the original state when it is not energized. The double solenoid valve has two coils, one state is energized on one side, the state before the power off is maintained when the power is off, the other side is energized and transposed to another state, and the state before the power off is maintained when the power is 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, the coil needs to be energized for a long time, and the coil will be energized for a long time and then it will heat up and burn out the coil. In this case You can choose a double control valve; > If you need to reset after power off, use a single electric control. If you need to maintain after power off, then use dual control solenoid valve!

A. The principle of single electric control
The single solenoid valve controls the movement of the valve core 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! Left spring extended.

B. The principle of double electric control
The double electric solenoid valve controls the opening and closing through the power-on and power-off of the solenoid coils on both sides. When one coil is powered off and the other is not powered, the valve core can be kept still, which is called a valve with memory function. The right side loses power, the left side loses power, the right side loses power, and the left side loses power.