Adjustable air valve
US4828169A · kind A · utility
Inventor
Key dates
| Filing date | Sep 9, 1988 |
| Grant date | May 9, 1989 |
| Priority date | — |
| Expiry date | Sep 9, 2008 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF24D19/081
- WIPO fieldThermal processes and apparatus
- WIPO sectorMechanical engineering
Abstract
An adjustable air valve for steam radiators, comprising a cylindrical valve body of seamless brass having a predetermined outer diameter; an upper circular disc cap closing off the top end of said valve body; a lower circular disc cap closing off the lower end of said valve body; a frusto-conical vent wall portion defining a vent orifice of fixed diameter formed integrally within said valve body proximate to said upper cap; said orifice lying in a vertical plane disposed radially inwardly of the outer cylindrical envelope of said valve body; a U-shaped bi-metallic spring cantilevered from inner portions of said valve body opposite said vent orifice; an elastomeric sealing member having a flat circular sealing surface of diameter in excess of the diameter of said vent orifice; said spring being adapted to expand and to contract in response to temperature variations to move said sealing surface selectively into and out of seal contact with said orifice; a cylindrical band having a series of apertures of graduated size; said band mounted externally of said valve housing for circular movement thereabout and in juxtaposition with the outer portion of said frusto-conical vent, whereby th…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.