In a pneumatic system, an AND gate is known as _____.

Explanation:

AND Function

• In a pneumatic system, a two pressure-valve or dual-pressure valve works as an AND gate.
• If a compressed air signal is applied to input X and input Y at the same time, this will produce a signal at output Z.

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• However, if there is no signal, there is also no output signal. 
• If only one input signal is applied, there will be no output signal.

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• In case of time differences between the input signals, the signal arriving last reaches the output.
• In case of pressure differences between the input signals, the signal with the lower pressure reaches the output. 

Important Points

OR Function

• The single-acting cylinder in Fig can be operated by two different circuits.
• Examples include manual operation and relying on automatic circuit signals, that is, when either control valve or control valve is operated, the cylinder will work.
• Therefore, the circuit in Fig. possesses the OR function. However, if the output of two 3/2 directional control valves is connected through the port of a triode, the air current from the control valve will be released through the exhaust of the control valve, and so the cylinder will not work.
• This problem can be solved by connecting a shuttle valve to the port of the triode.
• The shuttle valve allows fluid flow from one of two sources just like OR logic. The basic structure of a shuttle valve is like a tube with three openings.