US PATENT SUBCLASS 137 / 51
.~ With other condition responsive valve control

Current as of: June, 1999
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137 /   HD   FLUID HANDLING

47  DF  SPEED RESPONSIVE VALVE CONTROL {5}
51.~ With other condition responsive valve control {1}
52  DF  .~.~> Governor drive failure responsive

DEFINITION

Classification: 137/51

(under subclass 47) Control systems including additional means responsive to another operating condition which may actuate the same valve which is actuated by the speed responsive means, or another valve.

SEE OR SEARCH CLASS

73, Measuring and Testing,

509, for a speed responsive device that is also responsive to a nonspeed condition.