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A flow-regulating valve is described. It can keep the air flow constant at a desired rate, even if the feeding pressure varies from 3 to 70 cm H2O. It can also be used as a solenoid operated shutter. Square flow waves can be obtained if the shutter is intermittently opened during, e.g., a continuous breathing effort against the valve.
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B. Jonson (1969) studied this question.
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