Patent ID: 8418732
Filing Date: 2013-04-16
Classification: G05D

Abstract:
1. An apparatus for delivering a blend of two or more compressed gases to a receiving vessel, the apparatus comprising: one or more compressed as storage vessels containing a first compressed gas; a first pressure regulated flow control valve in downstream fluid flow communication with the one or more compressed gas storage vessels containing the first compressed gas; a first critical flow venturi in downstream fluid flow communication with the first pressure regulated flow control valve; one or more compressed as storage vessels containing a second compressed gas; a second pressure regulated flow control valve in downstream fluid flow communication with the one or more compressed gas storage vessels containing the second compressed gas; a second critical flow venturi in downstream fluid flow communication with the second pressure regulated flow control valve; and a mixing junction in downstream fluid flow communication with the first critical flow venturi and also in downstream fluid flow communication with the second critical flow venturi for receiving the first compressed gas and the second compressed gas, the mixing junction in upstream fluid flow communication with the receiving vessel; a first flow meter operatively disposed between the one or more compressed as storage vessels containing the first compressed gas and the receiving vessel for measuring the flow rate of the first compressed as independent of the flow rate of the second compressed gas; and a second flow meter operatively disposed between the one or more compressed gas storage vessels containing the second compressed gas and the receiving vessel for measuring the flow rate of the second compressed gas independent of the flow rate of the first compressed gas; a first current-to-pressure transducer operatively connected to the first pressure regulated flow control valve for adjusting the first pressure regulated flow control valve; a second current-to-pressure transducer operatively connected to the second pressure regulated flow control valve for adjusting the second pressure regulated flow control valve; and a controller operatively connected to the first flow meter for receiving a signal representing the flow rate of the first compressed gas, the controller operatively connected to the second flow meter for receiving another signal representing the flow rate of the second compressed gas, the controller operatively connected to the first current-to-pressure transducer and the second current-to-pressure transducer for sending control signals to the first current-to-pressure transducer and the second current-to-pressure transducer; wherein the first compressed gas and the second compressed as have different compositions.