.~ With other condition responsive valve control {1}
52
.~.~ Governor drive failure responsive
DEFINITION
Classification: 137/52
(under subclass 51) Control systems wherein the additional condition responsive means comprises a control device responsive to the breaking or failure of the driving means for the speed responsive governor to effect closing or substantial closing of a valve.
(1) Note. The valve which is closed or substantially closed on failure of the driving means may be the valve controlled by the speed responsive governor or another valve.
SEE OR SEARCH CLASS
73, Measuring and Testing,
508, for a governor having drive failure responsive means.
251, Valves and Valve Actuation, 27, for fluid pressure servo operated valves having means to close the valve on failure of the servo means, and subclass 69 for biased trip valves having the trip actuated on failure of the electric power.
