发明授权
US4666378A Diaphragm type pump device having a cushion member 失效
具有缓冲构件的隔膜式泵装置

Diaphragm type pump device having a cushion member
摘要:
A diaphragm type pump device has an elastic material imparting elasticity by the change of its volume which is placed in an operation chamber to decrease residual volume in the operation chamber when a diaphragm reaches the upper dead point.
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