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Model Series DGV -Thermoplastic Degassing Valves
Safety: Allows safe expulsion of unwanted air in piping systems. Dependability: Patent-pending float mechanism assures minimal emission of system liquid prior to sealing. Minimal Closing Pressure: Closes at 0 PSI, as long as liquid is present. Cost Efficient: Designed to improve system performance and competitively priced. Superior Design: Valve opens and closes automatically, over and over and over. Corrosion Resistant: Top quality thermoplastics and elastomers resist chemical attack and protect system purity. No metal components in Series DGV.
Series DGV is a normally-open valve that closes when liquid is present. Function is diagrammed in the series of illustrations below, from left to right...
First, at left, the valve is shown in a system with no liquid present. Gravity keeps the float down and the valve open. Air flows freely in and out.
In the second illustration, the system is operational and the pipelines are filled with liquid (shown as light blue). The polypropylene float rises with the liquid and the valve closes.
In the third illustration, the liquid is outgassing, and gas collects in the highest point of the system...where Series DGV is located.
Fourth illustration (below right) sufficient air or gas has accumulated, and the float drops. The valve now opens, and liquid pressure forces the air or gas through the vent. Once the gas is expelled, the float rises and again closes the valve. This process can repeat over and over, as often as gas occurs.
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. 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.