What is a normally open solenoid valve? Normally open solenoid valve working principle

Normally open electromagnetic What is a valve?

Solenoid valve Usually divided into two types: normally open type and normally closed type. Special ones include self-retaining solenoid valves, also called normally open and normally closed solenoid valves. Normally open solenoid valve means that when the coil is powered off, solenoid valve opens;When the coil is energized, the solenoid valve closes. Normally closed solenoid valve means that when the coil is powered off, the solenoid valve closes;when the coil is powered on, the solenoid valve opens.

We can Choose normally closed or normally open type according to the length of continuous working time.

1. When the solenoid valve needs When it is closed for a long time, and the closed time is more than the open time, and the continuous open time is not very long, you can choose the normally closed type.

2. It needs to be turned on for a long time and at the same time When closed for a long time, a maintained solenoid valve should be selected, that is, a normally open and normally closed solenoid valve.

3. When the solenoid valve needs to be opened for a long time , and the open time is more than the closed time, and the continuous open time is not very long, you can choose the normally open type.

4. It may be used in gas alarm systems. Use a normally open gas emergency shut-off solenoid valve with manual opening.

5. But some need to be used for security protection For working conditions, 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.

Working principle of normally open solenoid valve

There is a closed cavity in the normally open solenoid valve, with through holes at different positions. Each hole leads to a different oil pipe. In the middle of the cavity It is a valve with two electromagnets on both sides. The valve body will be attracted to which side the magnet coil is energized. By controlling the movement of the valve body, it blocks or leaks different oil drain holes, while the oil inlet hole is normally open. , the hydraulic oil will enter different oil drain pipes, and then push the piston of the oil cylinder through the pressure of the oil. The piston in turn drives the piston rod, and the piston rod drives the mechanical device. In this way, the mechanical movement is controlled by controlling the current on and off of the electromagnet. The normally open solenoid valve is a solenoid valve. Its characteristic is that the solenoid valve closes when the coil is energized, and opens when the coil is deenergized. Solenoid Valve< /a> If it is open for a long time, if it is only closed occasionally, you should also choose a normally open solenoid valve.

Normally open solenoid valve action principle: When the coil is energized, the pipeline is connected;once the coil is deenergized, the pipeline is disconnected. Usually selected according to the length of continuous working time: normally closed, normally open, or continuously powered on.

1. When the pipeline needs to be opened for a long time, And if it lasts longer than the closing time, a normally open solenoid valve should be selected.

2. If the pipeline is open for a short time or When the opening and closing time is short, a normally closed solenoid valve is used.

3. Some working conditions for safety protection , such as furnace and kiln flame detection, etc., the normally open solenoid valve cannot be selected, and the long-term energized type should be selected.

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