A brief article outlining the diffences between various types of venting valves is available by clicking here.
Series DGV -- Automatic Degassing Valve -- UNITED STATES PATENT #7,481,238 B2 -- Vents trace amounts of gas continuously, as they occur and accumulate in the valve. Recommended for applications prone to outgassing, ozone processes, etc. This is a normally open valve -- vents in or out -- increasing liquid pressure forces air/gas out. Rising liquid lifts a natural polypropylene float, which acts on an armature and seal to close the valve bubble tight. When air or gas accumulates again, the float drops and the valve reopens. Liquid pressure forces the gas to be expelled, and then re-closes the valve. The process repeats over and over, automatically, as gas accumulates.
The valve has a very small orifice and is designed for trace amounts of gas. To expel large volumes of air such as at system start-up, see Series ARV above. If your application requires expulsion of a large amount of air, as well as periodic venting of smaller amounts, you may require both the Series ARV and Series DGV.
For a web page with complete specifications, please click here.
For a Self-Training PowerPoint presentation on Series DGV, please click here.
To see a Video of this valve operating, please click here. For demonstration purposes, the video shows a clear acrylic valve with an attached streamer. This is only for demonstration purposes.