| 摘要 |
A valve that controls the speed of a turbine that is moved by an oscillating air column. This turbine's speed is constantly being compared with the constant output of a digital oscillator. The deference between this two is an error voltage that is amplified and applied to the servomotor. That will increase or decrease the air flow to meantime the speed of the turbine constant and in phase with the digital oscillator. This valve is placed between the input of the turbine and the output of the pressure chamber or the oscillating air column.
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