Common Locations and Types of Main Shutoff Valves Reviewed by Deane BiermeierA main water shutoff valve usually uses a lever ...

Ball valves are simpler inside. A ball with a hole through it opens and closes with a quarter turn. Fewer complex parts, fewer things to go wrong. Ball valves almost never let you down.

An example of the latter is offered by Crane, which suggests using the loss coefficient model: The conversion to flow coefficient C is given by the derived equation Where d = inside pipe diameter (or ...