| 摘要 |
The present invention relates to pressure adjustment valves for circuits for the manual administration of gas mixtures in the medical field, such valves including a body that can be interposed on the circuit of a manual respiration unit and which has an intake port and a discharge port. Means are provided in the body of the valve which means can be positioned to vary the useful passage section of the gas stream within the valve in order to modify the resistance created by the adjustment valve to the gas steam.
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