| 摘要 |
A diaphragm valve includes a single layer, metal diaphragm cooperating with a plastic valve seat. The surface area and volume of the valve seat is limited. Additionally, the central portion of the diaphragm is generally hemispherically offset and extends axially from a planar periphery. The actuating stroke of the valve is maintained less than the offset that is formed in the diaphragm. Lastly, the valve seat is secured in such a manner to insure repetitive long term shutoff under a variety of operating conditions and limit entrapment and outgassing of potential system contaminants.
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