PNEUMATIC VALVE - Frequently Asked Questions (FAQ''s) Notes | EduRev

: PNEUMATIC VALVE - Frequently Asked Questions (FAQ''s) Notes | EduRev

 Page 1


LECTURE 38 
PNEUMATIC VALVE  
FREQUENTLY ASKED QUESTIONS 
 
1.  What is the function of a pneumatic valve? 
Answer:  
Function of pneumatic valve is to control the pressure, flow rate and direction of air flow in 
pneumatic circuits.  
 
 
2. How do you classify pneumatic valves? 
Answer  
We can classify the pneumatic valves as 
- Direction control valves 
- Non – return valves 
- Flow control valves 
- Pressure control valves 
 
3. What is the function of a Direction control valve? 
Answer  
Directional control valves start, stop or change the direction of flow in compressed air 
applications.  
 
4. Mention the application of a 2 way, 3 way and 4 way DCV 
Answer 
2 way valves are used for ON-OFF conditions. Three way DCV are used to control single acting 
cylinders. Four way DCV are used to control double acting cylinders 
 
5. What are functions of a check valve 
Answer 
The check valves are used to allow free flow of compressed air in only one direction and it 
prevents the flow of compressed air in the opposite direction. Since check valves blocks the 
reverse flow, they are also known as Non-return valves 
 
6. How do you classify the DCV based on construction? 
Answer  
Based on construction we can classify DCV as 
1) Poppet direction control valves 
2) Sliding spool valves 
3) Rotary spool valves 
 
Page 2


LECTURE 38 
PNEUMATIC VALVE  
FREQUENTLY ASKED QUESTIONS 
 
1.  What is the function of a pneumatic valve? 
Answer:  
Function of pneumatic valve is to control the pressure, flow rate and direction of air flow in 
pneumatic circuits.  
 
 
2. How do you classify pneumatic valves? 
Answer  
We can classify the pneumatic valves as 
- Direction control valves 
- Non – return valves 
- Flow control valves 
- Pressure control valves 
 
3. What is the function of a Direction control valve? 
Answer  
Directional control valves start, stop or change the direction of flow in compressed air 
applications.  
 
4. Mention the application of a 2 way, 3 way and 4 way DCV 
Answer 
2 way valves are used for ON-OFF conditions. Three way DCV are used to control single acting 
cylinders. Four way DCV are used to control double acting cylinders 
 
5. What are functions of a check valve 
Answer 
The check valves are used to allow free flow of compressed air in only one direction and it 
prevents the flow of compressed air in the opposite direction. Since check valves blocks the 
reverse flow, they are also known as Non-return valves 
 
6. How do you classify the DCV based on construction? 
Answer  
Based on construction we can classify DCV as 
1) Poppet direction control valves 
2) Sliding spool valves 
3) Rotary spool valves 
 
7. What are shuttle valves? 
Answer  
Shuttle valves, also known as double check valves, are used when control is required from more 
than one power source. It can be used as OR gate fluid logic control valve. 
 
 
8. What is a quick exhaust valve?. Mention its application. 
Answer  
  
A quick exhaust valve is a typical shuttle valve. The function of quick exhaust valve is to exhaust 
the cylinder air to atmosphere quickly. It is used with spring return single acting cylinder to 
increase the piston speed of the cylinders.  
 
 
9. Mention two functions of pressure control valve 
Answer:  
Limit the maximum system pressure 
Regulate the force or torque an actuator generates 
 
   
10. Mention five control elements used in valves 
Answer:  
Five control elements used in valves are Poppet (ball or disc), Spool, Piston, Diaphragm and 
sliding plates.  
 
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