US PATENT SUBCLASS 137 / 75
.~.~ Safety cut-off

Current as of: June, 1999
Click HD for Main Headings
Click for All Classes

Internet Version by PATENTEC © 1999      Terms of Use


137 /   HD   FLUID HANDLING

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

DEFINITION

Classification: 137/75

(under subclass 72) Apparatus in which the valve controlling the fluid flow is biased toward a closed position but is held open by a restraining means, the fusion or destruction of the heat destructible or fusible means causing a release of the restraining means.

SEE OR SEARCH THIS CLASS, SUBCLASS:

457, for other cut-offs which are operated in response to a change in thermal condition in the fluid within the controlled line.

SEE OR SEARCH CLASS

251, Valves and Valve Actuation,

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