This document describes different types of valves and their functions, including: - On-off valves like gate valves, plug valves, ball valves which are used to fully open or close flow. - Throttling valves like globe valves and butterfly valves which are used to control the rate of flow. - Check valves which allow flow in only one direction to prevent backflow. - Pressure relief valves which open at a set pressure to relieve excess pressure and protect systems. - Control valves and the components that are used in pneumatic pressure control systems.

1. 1
VALVES TYPE &
FUNCTION
VALVES

2. 2
Valves
 On-Off Service
 Throttling (Regulating) Service
 Prevention of back flow
 Pressure control (Control Valve)

3. 3
ON – OFF
SERVICE

4. 4
Gate valve.

5. 5
Gate Valve :-
ON – Off Valve ,Used in:
1-Water.
2- Oil.
3- Gas
4- Steam
And Other Fluid Services.

6. 6
Wedge gate valve and parallel
slide valve

7. 7
Gate valve 2.

8. 8
Plug valve (on-off) or Cock
low-pressure

9. 9
Plug valve (on-off) or Cock

10. 10
Plug valve Applications
 Gas and liquid fuel
 Water.
 Extreme temperature flow
 Boiler feed water.
 Low Pressure Steam .
 Corrosive Liquids and Gases

11. 11
Ball Valve (on-off)

12. 12

13. 13
Ball Valve Quarter-Turn
Hydraulic systems .
Water .
Air.
Oil .
Petrochemical .
High volume, high pressure and high
temperature flow .

14. 14
THROTTLING
(Regulating)
SERICE

15. 15
Globe Valve
(High pressure & value )

16. 16
Globe Valve.

17. 17
Globe Valve Ops.

18. 18
Needle Valve
 Fine accurate flow Cont.

19. 19
Butterfly Valve
 Flow Control
 Low Speed
 Both Side flow

20. 20


21. 21
Butterfly Valve 2

22. 22
Prevention of
back flow

23. 23
split disc check

24. 24
Split disc check valve
operation

25. 25
lift check valve (Recommended for
Vapor service)

26. 26
Swing check valve (liquids)
installed horizontal & vertical

27. 27
Swing check valve Ops.

28. 28
Piston check valves

29. 29
check valves

30. 30
Ball check valve (for heavy fluids)
installed horizontal ,vertical & angle

31. 31
Check valve (Ball)

32. 32
Pressure
Relive valves

33. 33
safety valves and relief valves
 Safety valves are primarily used with
compressible gases and in particular for
steam and air services .
 Relief valves are commonly used in liquid
systems

34. 34
Pressure Relief Valves
 Releases excess pressure to protect system.
 Use with Gases & Vapors & liquid.
 Open Full at once at set pressure.
 Outlet port larger than inlet port.
 Never adjust whilst in service.

35. 35
Type of Pressure Relief Valve
 Safety valve :Used with compressible gases .steam and air services .
 Relief valve : Used in liquid systems. as pressure overspill devices .
 Safety relief valve : used either for liquid or compressible fluid.

36. 36
Pressure Relieve valve (safety
valve) for clean air
 Releases excess pressure (clean air)

37. 37
Safety valve - liquid applications,
opens in proportion to the

38. 38
Typical examples of safety valves
used on steam & Air systems

39. 39

40. 40
pneumatic pressure reducing

41. 41
 Control system would normally consist of the
following components:
 Control valves.
 Actuators.
 Controllers.
 Sensors.

42. 42
Globe Valve.

43. 43

44. 44
Valve positions

45. 45
Orifice plate

46. 46
pressure gauge