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A three-port valve venting a cylinder locally.
Also known as: Rapid exhaust valve symbol, Quick dump valve symbol
In ISO 1219 fluid power diagrams a quick exhaust valve is drawn as a three-port valve fitted at a cylinder, venting its air directly to atmosphere rather than back through the control valve.
Vents cylinder air locally to atmosphere instead of returning it through the directional valve.
Contexts: Technical drawing
Increases retraction speed by removing the restriction of a long return line, a gain available only in pneumatics.
Contexts: Technical drawing
A three-port square body with a small shuttle circle inside it and an exhaust port drawn as a widening triangle.