(ball valve) any valve that checks flow by the seating of a ball
(Ball valve) A ball valve is a valve with a spherical disc, the part of the valve which controls the flow through it. The sphere has a hole, or port, through the middle so that when the port is in line with both ends of the valve, flow will occur.
(Ball valve) used to regulate the flow of water and to shut off skimmers, drains and other lines in order to vacuum or run a spa or water feature.
A one-way valve that is opened and closed by pressure on a ball that fits into a cup-shaped opening