Diaphragm pump with a diaphragm clamped in pressure-balancing arrangement
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United States of America Patent
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-
Feb 7, 1984
Grant Date -
N/A
app pub date -
Dec 29, 1981
filing date -
Dec 29, 1980
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
In a diaphragm pump the diaphragm separating the delivery chamber from the working chamber is clamped between a cylinder body and a cylinder cover in pressure-balancing arrangement. For this purpose a pressure-balancing space is provided to be radially outside and to encircle said diaphragm clamping surface, the pressure balancing space communicating with the working chamber through at least one communicating passage. Furthermore, a separate annular seal member is disposed to be radially outside the pressure balancing space chamber between the cylinder cover and the cylinder body to seal-off the pressure balancing space and the working chamber from the outside. This enables the diaphragm pump to be used at discharge pressures far greater than 350 bars and simultaneously permits the use of plastic diaphragms which are reliable in operation and have a large displacement capacity.
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