| 摘要 |
<p>In a membrane valve fluid flow control device (10) which includes a pair of superimposed surfaces (42, 42') wherein the membrane (20) is interposed between the surfaces under compression and further serves as a seal. A raised rib portion (102, 104, 106, 128, 130, 134) is provided to impact limited areas of the membrane and localize compression along a narrow band (108, 110) apart from and surrounding valve chambers (24) and any associated openings (26, 28, 38) through the surface. The raised rib portion will localize compression forces along a narrow band on the membrane and limit lateral flow of the membrane material to prevent thickening or bulging of the material over the valve seat (32) area.</p> |
