| 摘要 |
A weir-type diaphragm valve having a valve body, a flexible diaphragm and a valve stem. The valve body has an inlet end, an outlet end and an internal flow path disposed between the inlet end and the outlet end. Within the valve body is a weir disposed transverse to the flow path. Along the top edge of the weir is disposed a raised bead extending substantially along the entire length of the top edge of the weir. The flexible diaphragm is disposed above the valve seat. The diaphragm is flexible between a closed diaphragm position wherein the diaphragm is in tight abutment with the valve seat (so that the valve path is sealed closed) and an open diaphragm position wherein the diaphragm is spaced apart from the valve seat (so that the valve path is open). The valve stem and handle assembly is adapted to alternatively flex the diaphragm between the closed diaphragm position and the open diaphragm position.
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