Proportional control closed circuit gas admission system
First Claim
1. Apparatus for controlling partial pressure of a controlled gas in a gas -containing system, which comprises nozzle means for producing a jet of gas, means for providing a substantially constant pressure drop through said nozzle means irrespective of the pressure at the output of said nozzle means, means for variably interposing a surface into said jet of gas, sensor means responsive to said partial pressure in said system for adjusting said interposing means, means responsive to said jet for producing an output which varies with said interposing of said surface into said jet, and means responsive to said output for controlling the admission of controlled gas to said system.
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Accused Products
Abstract
Partial pressure of oxygen in a closed gas-containing system is controlled automatically. Unique electro-mechanical transducers employ electric meter movements to vary the angle of a surface in a jet of gas in response to a signal from an oxygen sensor, thereby to vary the direction of the jet and the stagnation pressure in a receiver. The kinetic energy of the jet is maintained constant irrespective of ambient pressure by a constant differential pressure regulator. A pneumatically operated servo valve responsive to the stagnation pressure in the receiver controls the admission of oxygen to the system.
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Citations
5 Claims
- 1. Apparatus for controlling partial pressure of a controlled gas in a gas -containing system, which comprises nozzle means for producing a jet of gas, means for providing a substantially constant pressure drop through said nozzle means irrespective of the pressure at the output of said nozzle means, means for variably interposing a surface into said jet of gas, sensor means responsive to said partial pressure in said system for adjusting said interposing means, means responsive to said jet for producing an output which varies with said interposing of said surface into said jet, and means responsive to said output for controlling the admission of controlled gas to said system.
Specification