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US 4,765,537 AGranted
Radiator vent valve
AssigneeITT Corporation
InventorJohn R. Donovan
Life of this patent
Estimating the term…
Abstract
An improved radiator vent valve includes a freely movable float in a cylindrical casing. The float is formed from a solid sphere of polypropylene. The float normally rests on a bimetallic thermostatic strip which has its ends folded under. The thermostatic strip rests on the bottom wall of the casing and is held in place by gravity, i.e., no fasteners or mechanical connection is made to the thermostatic strip.
Claims8
An air vent valve comprising a cylindrical housing having a wall on one end;
- vent means on said one wall, said wall includes an aperture, and said vent means includes a resilient grommet captured in said aperture and having a vent hole therethrough;
- a bottom cap closing the other end of said housing;
- an inlet port in the sidewall of said housing for providing fluid communication with a steam heating system;
- a float within said housing, said float being freely movable within said housing, said float is a sphere of solid material having a specific gravity less than the specific gravity of water;
- said inlet port is positioned below the center of said float;
- a bimetallic thermostatic strip contained in said housing between said float and said bottom cap and being freely movable within said housing between said float and said bottom cap, said bimetallic thermostatic strip being responsive to fluid temperatures in said housing to raise said float into sealing engagement with said vent hole when said fluid temperature is at or greater than a predetermined operating temperature.
3 more elements
Dependencies are inferred from the claim text.