| 摘要 |
A diaphragm valve has an asymmetric compressor (14) for moving the diaphragm between open and closed positions. The asymmetric compressor is movable carried by an operating spindle (15) so that if, for any reason, the diaphragm is destroyed, the asymmetric compressor (14A, 14B) makes emergency sealing with the valve body (10), preferably downstream of the valve body in the direction of fluid flow through the valve. An emergency "indestructible" sealing member (20) is preferably mounted in the compressor or valve body. |
