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plunger pump : ウィキペディア英語版 | plunger pump
A plunger pump is a type of positive displacement pump where the high-pressure seal is stationary and a smooth cylindrical plunger slides through the seal. This makes them different from piston pumps and allows them to be used at higher pressures. This type of pump is often used to transfer municipal and industrial sewage.〔(Plunger vs piston pumps )〕 ==History== The invention of the plunger pump is attributed to Samuel Morland based on a patent of 1675.
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