(under the class definition) Subject matter wherein the valve is provided with a device which converts heat energy into motive power or in which energy from a variation in buoyancy of a body is used to actuate the valve.
(1) Note. An example of a buoyancy motor is a hollow shell which when full of liquid sinks in the liquid but which floats when the liquid is pumped out of the shell.
SEE OR SEARCH CLASS
60, Power Plants,
495+, for motors having a buoyant working member motivated by the vertical rise and fall of the surface of a body of fluid, and subclasses 508+ or 516+ for motors which transduce temperature variation to work through the expansion or contraction of a confined solid, liquid or gas.
137, Fluid Handling,
76, for heating means for heat destructible or fusible control elements, subclasses 334+ for means for supplying or exchanging heat in fluid handling means, especially subclass 341 for electric heating elements and see the search notes to subclass 334, subclasses 386+, and the subclasses mentioned in the notes thereto, especially subclass 404 for sinking or bucket type floats and subclass 409, for float actuated, liquid level responsive valves, and see the search notes to subclass 404 and subclass 468 for temperature responsive means controlling valves, and see the search notes thereto.
