| 摘要 |
<p>A regulator for the optimal ventilation of any enclosed space, comprising an air passage formed in an annular casing, a portion of which passage, at one end of the annulus, is closed by a partition, the other portion of which passage is sealable by means of a control valve in the shape of a disc having through passages, the disc being coaxial with the casing and rotatably mounted therein, the ventilation being effected by making use of the difference in air pressure on both sides of the passage.</p> |
