Fluid handling – Self-proportioning or correlating systems – Self-proportioning flow systems
Patent
1974-06-06
1976-08-10
Nilson, Robert G.
Fluid handling
Self-proportioning or correlating systems
Self-proportioning flow systems
251122, 251276, G05D 1103
Patent
active
039735796
ABSTRACT:
Apparatus for controlling the flow ratio of two gases, such as carbon dioxide and air or oxygen, where the principal gas is subject to flow fluctuations and the second gas is added to it at a ratio which is to be kept constant despite the variations in flow of the first gas. From the upstream side of a fixed orifice in a main conduit, the first gas is conducted to a sealed chamber on one side of a very flexible diaphragm. The second gas is conducted to the other side of the diaphragm which serves, in conjunction with a valve controlled by the diaphragm, to equate the pressure of the second gas exactly to that of the first gas. An outlet from the pressure regulator leads to the inlet of a flow control valve, and the outlet of the flow control valve leads back to the main conduit to a point downstream from the fixed orifice. The flow control valve has a tapered metering stem which is movable relative to a stationary passage; adjustment means enables manually setting the position of the flow control stem relative to the passage.
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Nilson Robert G.
Veriflo Corporation
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