| 摘要 |
<p>A counterflow valve means, comprising: a) four-way valve means having a first and second input and a first and second output, and containing a first position wherein the first input is connected to the first output and the second input is connected to the second output, and a second position wherein the first input is connected to the second output and the second input is connected to the first output; b) first inlet duct means, containing a first leg, and a second leg, said first leg being connected to said first input, said first inlet duct means being adapted to receive a flow of a first gas or gas mixture, c) second inlet duct means, containing a first leg and a second leg, the first leg being connected to the second input, the second inlet duct means being adapted to receive a flow of a second gas or gas mixture, d) pressure regulation means having an input connected to the first output and an output connected to a first vent gas means, e) adjustable flow control orifice means having an input connected to said second output and an output connected to a second vent gas means, and f) valve outlet duct means having an input connected to said second leg of said first inlet duct means and to said second leg of said second inlet duct means and an output for connection to a device adapted to receive a flow of a mixture of said first gas or gas mixture and said second gas or gas mixture. <IMAGE></p> |
