Valves, which are devices that regulate flow in a pipeline, are staples of plumbing projects everywhere. Each valve needs a way that it can be opened (or actuated). There are many different types of opening methods available, but the most common actuating device for valves 14" and under are gears and levers. These manual operating devices are fairly inexpensive and easy to implement. Additionally, they don't require any extra planning or effort beyond simple installation (this article goes into more detail about the specifics of gear operation). This blog post gives a basic rundown of both gear operated valves and lever operated valves.
