US PATENT SUBCLASS 251 / 27
.~.~ Servo failure responsive control of main valve

Current as of: June, 1999
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251 /   HD   VALVES AND VALVE ACTUATION

12  DF  FLUID ACTUATED OR RETARDED {12}
25  DF  .~ Pilot or servo type motor {8}
27.~.~ Servo failure responsive control of main valve

DEFINITION

Classification: 251/27

(under subclass 25) Subject matter in which means are provided for causing the main valve to assume a position other than biased open or biased closed upon a loss of servo operating pressure, i.e., a position other than that which the uncontrolled valve would assume under pressure of the material flowing through the line.