Flow range extending valve

Details Flow range extending valve Flow range extending valve

G - Physics

01

F

G01F 7/00 (2006.01)

Patent

CA 2076595

ABSTRACT OF THE DISCLOSURE A valve arrangement for use in measuring a wide range of gas flow rates, comprises a valve housing including one inlet for a gas flow and two outlets, one for a low flow rate and the other for high flow rate. A plug is vertically moveable in the housing and includes a large diameter lower end engageable against a seat for closing a large port in the housing, and a small diameter upper end for engagement against an upper small diameter seat in the housing. The large and small seats communicate with the high and low flow rate outlets. Ferromagnetic material forms at least part of each seat with the plug being magnetic for retaining either its upper or lower position depending on the inlet flow rate. With a high inlet flow rate, the plug is lifted from its lower seat to close its low flow rate outlet and open its high flow rate inlet. At low flow rate, gravity causes the plug to drop. This permits the passage of the low flow rate gas through the low flow rate outlet. A diaphragm connected between the plug and the housing separates the outlets from each other. small or low flow rate flowmeter is connected to the low flow rate outlet for measuring the low flowrate range and a large or high flow rate flowmeter is connected to the high flow rate outlet for measuring the high flow rate range. Thus a broad range of gas flow rates can be measured.

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