| 摘要 |
<p>A mixing valve for mixing airstreams of different characteristics in an air distributing system, and wherein the mixing valve is provided with first and second groups of louvers so arranged that one group of louvers is moved toward an open position as the other group of louvers is moved toward a closed position and vice versa, and means is responsive to movement of either group of louvers toward and into closed position for exerting an opposing force thereon for aiding in subsequently opening the same against the force of an airstream impinging thereon.</p> |
