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Two Solenoid Valves Working Principle

A solenoid valve is an electro-mechanical device in which the solenoid uses an electric current to generate a magnetic field and thereby operate a mechanism which regulates the opening of fluid flow in a valve.

Two Solenoid Valves

Two Solenoid Valves are used in order to have redundant air supply arrangement to valve.

Two Solenoid Valve Redundancy

Now consider following cases:

Both SOV A & B are Energized:

In this case air supply is through SOV A, since SOV B exhaust is blocked because vent port of SOV A is closed.

SOV A Failed and SOV B Energized:

Since SOV A is failed so vent/exhaust port of SOV A is now open, hence exhaust of SOV B will go via vent port of SOV A to SOV exhaust port.

SOV A Energized and SOV B Failed:

Now SOV B vent port/exhaust port is open and SOV A is in line, but at the time of SOV A  de-energizing vent of SOV A will pass via exhaust port of SOV B to vent port of SOV A.

Hence depresurizing the system.

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Two Solenoid Valves Working Principle

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