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A valve bowtie with an open circle at its centre.
Also known as: Quarter turn valve symbol, Ball pattern valve
On a piping diagram a ball valve is drawn as the valve bowtie with an open circle at its centre, marking a quarter-turn valve with a bored ball as its closure.
Denotes a ball valve, opened and closed by a quarter turn of a bored ball.
Contexts: Technical drawing
Differs from the globe valve symbol only in whether the centre circle is filled, which is a fine distinction on a crowded drawing.
Contexts: Technical drawing
Two triangles meeting point to point with an unfilled circle drawn at their junction.