Solenoid valves (click for more information of maintain solenoid valve) are electronically operated devices that are normally used to control and direct the flow of fluids. They are useful in situations that demand remote control of fluids or other media. There are several types of solenoid valves, and two way solenoid valve is the most common one.

Basic Operation of Two Way Valves

Normally Closed Solenoid Valve

In the Normally Closed (NC) operation, the coil is de-energized to shut off the fluid and it is energized to let the fluid flow through.

Normally Open Solenoid Valve

Then there is the Normally Open (NO) operation in which the fluid flows when the coil is de-energized and is cut off when the coil is energized.

Basic Types of Two Way Valves

Direct Acting Solenoid Valve

In direct acting construction,the diaphragm opens the NC valve or closes the NO valve when the
coil is energized.The operating pressures range from zero bar to the valve’s maximum.These types of valves do not rely on the pressure of the media to open and close the diaphragm.

Pilot Operated Solenoid Valve

For the Pilot Operated valve type,a line pressure is used to assist in the operation of the valve. In this case, de-energizing the coil in the NC valve closes the pilot orifice, and line pressure is applied to the diaphragm thereby closing the valve. Energizing the coil, on the other hand, has the effect of opening the pilot orifice, which reduces the pressure on the diaphragm. This construction means that it is the line pressure that is solely responsible for opening the valve as it acts on the diaphragm. This construction is useful in operating large orifices with relatively small coils.

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