In a pneumatic system, an AND gate is known as _____.
![In a pneumatic system, an AND gate is known as _____.](http://storage.googleapis.com/tb-img/production/20/09/F1_Krupalu_Madhu_10.09.20_D6.png)
| In a pneumatic system, an AND gate is known as _____.
A. non return valve
B. gate valve
C. check valve
D. dual-pressure valve
Please scroll down to see the correct answer and solution guide.
Right Answer is: D
SOLUTION
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.
- 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.
- 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.
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.