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A ball in a tee, passing the higher of two pressures.
Also known as: Double check valve symbol, Higher pressure selector, OR valve symbol
In ISO 1219 fluid power diagrams a shuttle valve is drawn as a ball in a tee-shaped body, automatically connecting whichever of two inlets carries the higher pressure to the single outlet.
Denotes a valve that passes the higher of two inlet pressures to its outlet, the ball sealing the lower one.
Contexts: Technical drawing
Performs a logical OR on two pressure sources, which is why it is sometimes named for that function rather than for its construction.
Contexts: Technical drawing
A tee of three lines meeting at a junction, containing a single small circle that seats against whichever of the two inlet ports carries the lower pressure.