1. Directional Valves

2. Spool Valves
Bonded Spool Design
Provides a positive seal

3. Spool Valves
Overlap Design
Can be shifted with only a solenoid

4. Spool Valves O-ring Design
O-rings are fitted inside grooves in the spool or body

5. Spool Valves O-ring Design
O-rings are fitted inside grooves in the spool or body

6. Spool Valves O-ring Design
O-rings are fitted inside grooves in the spool or body

7. Spool Valves O-ring Design
O-rings are fitted inside grooves in the spool or body

8. Spool Valves O-ring Design
O-rings are fitted inside grooves in the spool or body

9. Solenoid Operated Spool Valves

10. Solenoid Failures The plunger can bind or stick when energized
The valve spool may stick due to contamination
Low Voltage
Over Voltage
Cycling Rate
High Ambient Temperature
Energizing both Solenoids at the same time

11. Checking the Solenoid
When operating properly, the housing should be warm
A bad solenoid will have a burnt smell
Check the solenoid with an ohmmeter
For a 110V Solenoid, about 50 ohms or less but not 0 ohms.
0 ohms means the solenoid is shorted
Infinity means the solenoid is open

12. Solenoid Operated Poppet Valve

13. Solenoid Operated Poppet Valve

14. Solenoid Operated Poppet Valve

15. Solenoid Operated Poppet Valve

16. Two Position, Two Way Valves

17. Two Position, Two Way Valves

18. Two Position, Two Way Valves

19. Two Position, Two Way Valves

20. Two Position, Two Way Valves

21. Two Position, Two Way Valves

22. Two Position, Three Way Valves

23. Two Position, Three Way Valves

24. Two Position, Three Way Valves

25. Two Position, Four Way Valves

26. Two Position, Four Way Valves

27. Two Position, Five Way Valves

28. Two Position, Five Way Valves

29. Five Way Valves Used as Two Way Valves
Normally Open
Normally Closed

30. Five Way Valves Used as Three Way Valves
Normally Open
Normally Closed

31. Double Solenoid Valves
Detent

32. Double Solenoid Valves
Three Position, Closed Center

33. Double Solenoid Valves
Three Position, Closed Center

34. Double Solenoid Valves
Three Position, Float Center

35. Double Solenoid Valves
Three Position, Float Center

36. Solenoid Controlled, Air Piloted
Poppet Valves

37. Solenoid Controlled, Air Piloted
Poppet Valves

38. Solenoid Controlled, Air Piloted
Poppet Valves

39. Solenoid Controlled, Air Piloted
Poppet Valves
Internally Piloted
Externally Piloted

40. Valve Actuators
Solenoid
Manual
Palm Button

41. Valve Actuators
Manual Lever
Cam Roller
Foot Pedal
Remote Air Pilot

42. Valve Actuators Solenoid Controlled, Internally Air Piloted
Proportional
Servo
Detent

43. Troubleshooting Directional Valves and Cylinders

44. Troubleshooting Directional Valves and Cylinders
Directional Valve Testing
Over time, tolerances can increase due to o-ring wear
Shift the valve to extend the cylinder and maintain
in the shifted position
If air is exhausting out of the valve, then the valve is
excessively worn