Glossary of Terms
Back Siphonage - Occurs when a negative pressure (below atmospheric pressure, or a vacuum) develops in the distribution system which can allow pollutants or contaminants to be siphoned into the water system.
Quick Facts
Ball Valve - A valve with a ball resting in a cylindrical seat. A hole is bored through the ball to allow water to flow when the valve is open. When the ball is rotated 90 degrees, the valve is closed.
