| 摘要 |
<p>A stop valve to terminate flow of a liquid on the actuation of sensing means on the level of liquids. The valve comprises a diaphragm main valve controlled by a diaphragm pilot valve operated by the sensing means. The diaphragm pilot valve has a control sealing portion on a valve seat, the diaphragm pilot valve having a plurality of radial arms extending from the sealing portion thus ensuring that the sealing portion centrally seals on valve seat.</p> |
