Solenoid valves are divided into two types: normally closed solenoid valves and normally open solenoid valves.
1. A normally closed solenoid valve refers to a valve where the air path is disconnected when the coil is not energized.
2. A normally open solenoid valve means that the air path is open when the coil is not energized.
Normally open solenoid valves or normally closed solenoid valves are usually selected based on the duration of continuous operation.
1. When the solenoid valve needs to be open for a long time and the duration is longer than the closing time, a normally open solenoid valve should be selected.
2. If the opening time is short or the opening and closing times are not long, then a normally closed solenoid valve should be selected.
The working principle of a normally closed solenoid valve: When the coil is energized, the air path is connected. Once the coil is de-energized, the gas path will be disconnected.
The working principle of a normally open solenoid valve: When the coil is energized, the air passage is disconnected. Once the coil is de-energized, the gas path will be connected.
When there is no power supply, if the valve is in the open state, it is of the normally open type; if it is in the closed state, it is of the normally closed type. The working principle is to supply power to the coil of the solenoid valve to generate a magnetic force, which drives the valve core to act, thus connecting or disconnecting the pipeline.
Normally open and normally closed are just two states of a switch, that is, a relay. These two states can be set by oneself. For example, when the pressure is lower than a certain value, it is in the normally open state. When the pressure is higher than this value, the switch operates and the normally open state becomes normally closed.
It can also be in the normally closed state when the pressure is lower than a certain value, and when it is higher than this pressure value, the switch operates and the normally closed state changes to the normally open state. It depends on how it is set up.
Two-way valves are divided into normally open and normally closed types. However, they are either solenoid valves or manual valves. I have never seen a valve with both types of control. By reversing the valve core of a normally open valve, it becomes a normally closed one.
Above is the difference between a normally closed solenoid valve and a normally open solenoid valve. For learn more related information are available https://www.joosungauto.com/.
