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A normally closed valve opening at a set inlet pressure.
Also known as: Sequencing valve symbol, Pressure sequence valve
In ISO 1219 fluid power diagrams a sequence valve is drawn as a normally closed square that opens when inlet pressure reaches a set value, starting a second action only after the first has completed.
Denotes a valve that opens at a preset inlet pressure to begin a second circuit action after the first has finished.
Contexts: Technical drawing
Uses pressure as an indication that a preceding movement has completed, for instance clamping a workpiece before drilling begins.
Contexts: Technical drawing
A square with a blocked flow path, a spring on one side and a dashed pilot line taken from the inlet.