The document discusses hydraulic and pneumatic systems, specifically focusing on pilot-operated check valves, which allow flow in one direction but can be released with pilot pressure. It compares pilot-operated check valves to normal check valves, highlighting advantages such as high pressure ratings and low leakage. Additionally, it mentions applications of three-way valves in various industries including agriculture and pharmaceuticals.

1. Mechatronics Department
Third Year
Second Semester
Hydraulic & Pneumatic
Systems ‘MT 312’
Done By: 1-Ahmed Zabarah.
2- Ahmed Al-Oqabi.
3- Zyad Al-Himi

2. 8- Hydraulic Valves

10. Pilot operated check valve

11. Pilot operated check valve
 -Discribtion
It is a valve that allow a flow to move
in either of one directions.
-This can be done using the normal
principal .
-In addition to that a pilot is used.

12. *What is the difference between
check valve and pilot operated
check valve?
-normal check valve allow the flow in one direction.
-p.o.check valve are unique In that they block the flow in
one direction ,like normal, but can be released as soon as
the right level of pilot pressure is applied.

13. Normal check valve

14. Pilot operated check valve

15. Pilot operated check valve
 -Advantiges
1-High pressure rating
2-virtually zero leakage
3-flixability of usage

16. Pilot operated check valve
Application
1-Agriculture machinery
2-Costruction machines
3-General mechanical engineering

18. Valves that contain three ports are
called three-way valve

19. Two positions 3-way valves

21. Mixing three way valve

22. Diverting three-way valve

23. Symbols:

24.  A 3-way valve is normally provided with an electrical,
pneumatic or thermal actuator to control the ratio of
mixing or diverting . Some applications does not
require high accuracy such as mixing hot and cold
water , while other applications like food and
pharmaceutical industrys.

25. Thanks