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Ball valve

a valve controlling flow by means of a ball pierced with an opening in one direction and fixed to rotate on a spindle at right angles to the opening.
any valve that checks flow by the seating of a ball.
Historical Examples

Near the bend is an outlet tube, c, provided with “ball valve” or pinch cock.
Scientific American Supplement, No. 508, September 26, 1885 Various

The plunger is loaded with a spiral spring, and has a ball valve, as shown.
Gas and Oil Engines, Simply Explained Walter C. Runciman

An overflow is provided, discharging into the open air to allow the water to escape should the ball valve become defective.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 2 Various

a one-way valve consisting of a metal ball with a cylindrical hole fitting into a concave seat over an opening

ball valve n.
A valve regulated by the position of a free-floating ball that moves in response to fluid or mechanical pressure.


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