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Two squares side by side with two connections.
Also known as: 2/2 valve symbol, Two way two position valve, Shut-off valve symbol
In ISO 1219 fluid power diagrams a valve is drawn as one square per position with the ports shown on the outside. Two squares and two ports denote a simple shut-off valve with an open and a closed state.
Denotes a valve with two ports and two positions, one passing flow and one blocking it.
Contexts: Technical drawing
Introduces the standard's valve grammar: one square per position, ports drawn against the square representing the rest state, and the whole block imagined as sliding to change position.
Contexts: Technical drawing
Two squares drawn side by side sharing their edges, one containing a through arrow and the other a blocked path, with two lines entering from outside.