Spool Symbols

This chart provides a visual representation of various spool configurations used in hydraulic and pneumatic systems. It categorizes them into two main types: Transition Spool and Slide Valve Spool.

Transition Spool

• Symbol: Typically represented by a rectangular block with arrows indicating flow direction.
• Configuration: Includes different arrangements of ports (A, B, P, T) and the position of the spool (a or b).
• Function: Controls the flow of fluid between ports, enabling various functions like directional control, pressure control, and flow control.

Slide Valve Spool

• Symbol: Similar to the Transition Spool but often with additional details like notches or grooves.
• Configuration: Features different arrangements of ports and spool positions.
• Function: Similar to the Transition Spool, used for controlling fluid flow in hydraulic and pneumatic systems.

Additional Notes:

• The chart includes examples of specific spool configurations with their corresponding codes (e.g., EA for spool E with core position a).
• The “PT” symbol typically indicates a pressure port.

Summary Table