Motor and control equipment of electrically operated valves
H. M. Gassman · Proceedings of the American Institute of Electrical Engineers · 1912
Valves of 24 in. (60 cm.) diameter and larger are usually operated other than by hand for the reason that generally such valves must be closed in a very short time, which is impossible by hand-operation, and also because such valves are frequently located in out of the way places and more conveniently controlled from some operating point more or less remote from the valves.