This document discusses different types of hydraulic valves and components. It covers pressure control valves like relief valves, reducing valves, and unloading valves. It also covers direction control valves like check valves, 3/2 valves, 4/2 valves, and 5/2 valves. Additionally, it discusses flow control valves, manual and pilot operated valves, poppet and spool valves, actuators, pipes and hoses, fittings, seals, accumulators, and pressure boosters.

1. a) According to function:
1. Pressure control valves:
Relief valve Reducing valve Unloading valve
Sequence valve .
Counter balanced valve
2. Direction control valve:
check valve
4/3 valve
2/2 valve 3/2 valve 4/2 valve
5/2 valve.
Variable restriction FCV
Pressure compensated
3. Flow control valve :
Fixed restriction FCV
FCV with Reverse free flow
valve
Temperature compensated valve Cam operated FCV

2. b) According to the method actuation:
1. Manual operated:
Palm operated Push button operated
operated
Hand lever operated. Foot pedal
Cam(roller) operated
b.Double pilot.
2.Pilot operated:
a.Single pilot
3.Solenoid operated:
Single solenoid Double solenoid.
c) According to construction:
1. Poppet type:
2. Spool type:
Ball type, conical poppet type.
Sliding spool type, rotary spool type.
3. Flow control : Gate valve, plug valve, needle valve, poppet
valve, butterfly valve etc.

3. 1. Flow rate of oil.
2. Pressure of oil.
3. Force required by cylinder.
4. Speed of operation of cylinder
5. Type of actuation of the valve.
6. Port size.
7. Space requirement.
8. Temperature of oil
9.Oil under pressure compatibility.
10.Environment conditions.

4. Pressure Relief Valve Pressure Reducing Valve
PressureReliefValves.mp4
PressureReducingValve-Pilot Operated.mp4

5. Comparison between Pressure Relief Valve and Pressure
Reducing Valve

6. Unloading Valve
UnloadingValveBasics.mp4

7. Comparison between Pressure Relief Valve and
Unloading Valve

8. Counter Balance Valve Sequence Valve

9. a) According to the method actuation:
1. Manual operated:
Push button operated
Foot pedal operated Cam(roller)
b.Double pilot.
Double solenoid.
Palm operated
Hand lever operated.
operated
2. Pilot
operated:
a.Single pilot
3. Solenoid operated:
Single solenoid
b) According to ype of spool:
1. Poppet type.
2. Sliding Spool type.
3. Rotary spool type.
a)According to number of ports and position:
3/2 valve 4/2 valve
check valve
4/3 valve
2/2 valve
5/2 valve.

10. Check Valve
CheckValveAnimation.mp4

11. Sliding Spool type 2/2 DCV Rotary Spooltype 2/2 DCV
2/2 Direction Control Valve

12. Sliding Spool type 3/2 DCV Rotary Spool type3/2 DCV
3/2 Direction Control Valve
usinga32valveNO tocontrolacylinder.mp4

13. Sliding Spool type 4/2 DCV Rotary Spool type 4/2 DCV
4/2 Direction ControlValve
4-2 Directionalcontrolvalve.mp4 rotaryspooldirectionalvalves work.mp4

14. Sliding Spool type 4/3 DCV Rotary Spooltype 4/3 DCV
4/3 Direction Control Valve
4-3 Directionalcontrolvalve.mp4

15. Sliding Spool type 5/5 DCV Rotary Spool type5/2 DCV
5/2 Direction Control Valve
52valve.mp4

16. Method of Actuation and there Symbol

17. Variable Restriction FCV
FCVwith Reverse Free
Flow
Flow Control Valve
Fixed Restriction FCV
Flowcontrolvalves work.mp4

18. Pressure &Temp.
Compensated FCV
Cam operated FCVwith
integral check valve
PressureCompensatedValve- Part2.mp4
Camshaft_ ValveAnimation.mp4

19. 1.Time Delay Valve 2. Shuttle Valve
Special Type Valves
Shuttlevalve.mp4

20. 3.Twin Pressure Valve 4. Pilot Operated check
valve (Open &Closed)
Special Type Valves
PilotOperatedReliefValve Animation.mp4

21. 3/2 Poppet type Direction
Control Valve
Comparison

22. Classification of Actuators 2. Rotating Cylinder

23. Single acting cylinder Double acting cylinder
SingleActingCylinder.mp4
DoubleActingCylinder.mp4

24. Diaphragm cylinder Double rod end cylinder
DiaphragmCylinder.mp4

25. Tandem cylinder Cylinder with cushioning
TandemCylinder.mp4

26. Telescope cylinder Cylinder Mountings
Telescopiccylinder2.mp4

27. A) Vane type
B) Piston type(Rack and
pinion type
Rotary Actuators
PistontypeActuator.mp4

28. External Gear Motor Radial Piston Motor
EXTERNALGEARPUMP.mp4
InternalGearPump.3gp

29. Gerotor Motor Vane type Motor
GerotorOperation.mp4

30. Axial PistonMotor
SWASHPLATEPISTONPUMP.mp4

31. Flexible Hose

32. a) Rigid pipe:
Cast iron, Low carbon steel, Alloy steels, stainless
steel, Copper and its alloy, Aluminum and its alloy.
b) Flexible hoses :
Nylon braided hoses, steel wire reinforced rubber
hoses, poly-urethene tubes, Nylon tubes, polyethylene
tubes, PVC tubes, polypropylene etc.
a)According to strength:
Standard pipe (STD), Extra strong pipe(XS),
Double Extra strong Pipe (XXS).

33. Flare-Less type fitting (Ferrulefitting)

34. a) According to method of sealing:
1. Positive seal: perfect seal, 100 % leak proof.
2. Non- positive seal: allow small amount of leakage.
b) According to application:
1. Steel seal : used between mating parts having no
relative motion.
E.g. sealing between flange, gasket etc.
2. Dynamic seal: used between mating parts with relative
motion.
E.g. rotary motion seal between pump shaft and casing.
a)According to shape configuration:
O-ring, quad-ring, T-ring, V-ring, U-cap, Hat ring etc.

35. Following are the reason for failure of hydraulic seals.
Excessive heat.
Excessive load.
Excessive clearance.
Excessive pressure.
Improper fitting.
Improper groove gravity.
Improper filter rating.
Contamination of fluid.
Idle storage of seals
Age hardening.
Abrasion.

36. A) Dead weight accumulator
B) Spring loaded
accumulator
Classification of accumulators:
C) Separator type accumulator

37. Accumulators: Circuit

38. A) Single acting Booster B) Double acting Booster
Pressure Boosters: