| 摘要 |
In a pumping apparatus having a flexible diaphragm a disc is arranged for supporting the diaphragm. The support disc has holes through which the pump liquid passes. For preventing the diaphragm from being drawn into the holes plugs are inserted in the holes in such a way that openings or slots are formed which are sufficiently wide for the liquid to flow therethrough but are not wide enough for the diaphragm to be sucked into the support disc. The diaphragm is thus prevented from becoming damaged. Various embodiments of suitable plugs are illustrated which either form the narrow openings in combination with the surrounding wall of the holes in the support disc or are provided with holes or slots in the plug body.
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