| 摘要 |
<p>A valve for use with breathing apparatus the valve comprising a rigid circular disc (1) having a solid central area (2) and a plurality of apertures (3) between the solid central area (2) and the circumference of the disc (1), and a valve member (7) which is an annular member of elastomeric material, the valve member (7) being secured over a circumferential edge of the disc (1) such that the annular valve member (7) is under tension and, in the absence of a pressure difference between opposite surfaces of the annular valve member (7) tending to move the annular valve member (7) away from the disc (1), the annular valve member (7) is maintained in a plane covering the apertures (3) in the disc (1). The valve is shown in use in breathing apparatus as an inhale valve in conjunction with a demand valve, but may also be used as an exhale valve. <IMAGE></p> |
