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Three squares side by side with four connections.
Also known as: 4/3 valve symbol, Four way three position valve
In ISO 1219 fluid power diagrams three squares with four ports denote the common directional valve of a double-acting cylinder circuit: extend, retract and a centre position.
Denotes a four-port valve with three positions, the usual arrangement for driving a double-acting cylinder in both directions with a defined rest state.
Contexts: Technical drawing
Takes its character from what the centre square contains, which the standard defines as several distinct centre conditions.
Contexts: Technical drawing
Three squares drawn side by side sharing edges, the outer two containing crossed or parallel flow arrows and the centre one the rest condition, with four lines entering from outside.