| 摘要 |
A metering pump for use on a printing press has a pumping chamber formed between a rigid support plate (26) and a flexible diaphragm (32). A piston acts through the diaphragm to vary the volume of the chamber (60) and flow to and from the chamber is controlled by respective valves. The valves are formed by co-operation between the diaphragm and support plate and are operated by pistons acting through the diaphragm.
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