Hydraulic symbols diagram I Fluid circuit diagram for hydraulic system

Hydraulic symbols

Without symbol it is much more difficult to understand any circuit diagram that's why hydraulic system have several's of symbol like others. ANSI (American National Standards Institute) has responsibilities for this symbols. This standard symbols will helps anyone to understand properly how the system design and how they works. Lets see the hydraulic symbols name with diagram. 

Hydraulic symbols 

Hydraulic symbols

1. Piping line
2. Pilot line
3. Crossing line
4. Connected Line
5. Junction connection
6. Tank/reservoir below fluid level
7. Tank/reservoir above fluid level
8. Check valve
9. Pilot operated check
10. Spring loaded check valve
11. ON/OFF manual shut off valve
12. Direction of flow
    Fluid circuit diagram

    13. Hydraulic pump fixed displacement Directional
    14. Bi directional Hyd. pump
    15. Directional Hyd motor
    16. Bi Directional Hyd motor
    17. Pneumatic pump
    18. Bi Directional Pneumatic motor
    19. Variable displacement directional Hyd Pump
    20. Variable displacement Bi directional Hyd Pump
    21. Electric motor 

    Fluid circuit diagram for hydraulic system


    22. Engine
    23. Filter
    24.Accumulator
    25. Cooler
    26. Hand lever
    27. Push button
    28. Foot pedal 
    29. Mechanical operation 
    30. Solenoid valve
    31. Orifice
    32. Variable orifice
    33. Pressure gauge

    Fluid circuit diagram for hydraulic system

    34. Relief valve
    35. Reducing valve
    36. Sequence valve
    37. Compensator valve
    38. Shuttle valve
    39. Single position two-way valve
    40. Two-way two position
    41.3 Way two position
    42.4-way 2 position valve
    43. 4-way 3 position valve
    44. Single acting cylinder
    45. Double acting cylinder 

    Also read
    What is the Components of hydraulic system? Details of components
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