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Adjacent boxes whose arrows show each switched position.
Also known as: Spool valve symbol, Four-way valve symbol
A directional control valve is drawn as a row of boxes, one for each position it can take, with arrows inside showing the flow paths in that position. The boxes slide across the ports in the reader's imagination, which is the convention that makes fluid-power diagrams readable.
Draws each switching position of a valve as a separate box, the arrows inside showing which ports connect in that position.
Contexts: Technical drawing
Is read by imagining the boxes sliding so that the active position lines up with the fixed ports, which is how the symbol represents a spool moving.
Contexts: Technical drawing
Is named by its port and position count, so a four-three valve has four ports and three positions.
Contexts: Technical drawing
Two or three squares drawn side by side sharing their vertical edges, each containing arrows or blocked-off lines.