27.6.5Hand (manual) actuators

Valves may also be actuated by hand power alone. The following valves are all “manual” valves, requiring the intervention of a human operator to actuate:

Note the threaded stem of the lower-left valve. This stem rises and falls with the handle’s turning, providing visual indication of the valve’s status. Such an actuator is called a rising-stem design. Also note the chain on the upper-right actuator wheel, allowing operation of the high-mounted valve from a ground-level position.