US PATENT SUBCLASS 137 / 77
.~.~.~ With external closing means

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

67  DF  DESTRUCTIBLE OR DEFORMABLE ELEMENT CONTROLLED {2}
72  DF  .~ Heat destructible or fusible {3}
75  DF  .~.~ Safety cut-off {2}
77.~.~.~ With external closing means

DEFINITION

Classification: 137/77

(under subclass 75) Apparatus including a means for closing the valve by manual or external means in addition to the operation in response to the fusible or heat destructible element.

(1) Note. See the class definition, Automatic Control, and Subclass References to the Current Class for search notes on combined automatic and nonautomatic control of a fluid handling device.

SEE OR SEARCH THIS CLASS, SUBCLASS:

76, for manual or external closing by heating the fusible or heat destructible element.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

66+, for biased trip valve actuators not responsive to a condition change.