How to distinguish between normally open solenoid valve and normally closed solenoid valve

What is the difference between normally open solenoid valve and normally closed solenoid valve? Distinguish

1. Different control methods

(1) The normally open solenoid valve is a solenoid valve, Its characteristic is that the solenoid valve closes when the coil is energized, and opens after the coil is powered off. The solenoid valve in the pipeline is open for a long time. When it is occasionally closed, the normally open type should be selected. Control mode: Normally open;International standard voltage: AC (380, 240, 22.0, 24) V, DC (110, 24).

(2) Normally closed solenoid valve is suitable for actuators that use steam as the heat medium for automatic temperature control. It can perform two-position automatic control and remote control on boiler steam pipelines of steam heaters, radiators, dryers and other steam equipment as well as various types of temperature controllers, steam setting machines, steam engines, steam resurgence machines and other complete sets of equipment.

2. Different usage methods

Normally open solenoid valve means that when the coil is powered off, the solenoid valve opens;when the coil is powered on, the solenoid valve is closed;normally closed solenoid valve means that when the coil is powered off, the solenoid valve is closed;the coil When energized, the solenoid valve opens

3. Different scope of use

(1) When the solenoid valve needs to be closed for a long time, and the closing time is more than the opening time. And when the continuous opening time is not very long, you can choose the normally closed type. When it needs to be opened for a long time and closed for a long time, a maintaining solenoid valve should be selected, which is a normally open and normally closed solenoid valve.

(2) When the solenoid valve needs to be opened for a long time, and the opening time is more than the closing time, and the continuous opening time is not very long, you can choose the normally open type. Or for gas alarm systems, a normally open gas emergency shut-off solenoid valve with manual opening should be used.

(3) For some working conditions that need to be used for safety protection, such as furnace and kiln fire monitoring, the normally open type cannot be selected, and the type that can be energized for a long time should be selected.

Normally open and normally closed refer to the state of the solenoid valve when no power is supplied.

Normally open: ON state when there is no power, also That is, the valve is straight through and gas and liquid can flow

Normally Closed: OFF state when there is no power, the valve is closed and no circulation is possible.

By letters Discrimination

The surface of the solenoid valve will generally There is thisSolenoid valve Some text introductions are mostly in English, and those containing the word "CK" are generally normally open solenoid valves, that is, "changkai" The first letter of the full spelling of often open. The other one is normally closed. Or just follow the manufacturer's instructions to tell the difference.

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