The predecessor to the vacuum pump was the suction pump. Dual-action suction pumps were found in the city of
By … See more

Pumps can be broadly categorized according to three techniques: positive displacement, momentum transfer, and entrapment. Positive displacement pumps use a mechanism to repeatedly expand a cavity, allo… See more

Pumping speed refers to the volume flow rate of a pump at its inlet, often measured in volume per unit of time. Momentum transfer and entrapment pumps are more effective on some gases than others, so the pumping ra… See more

Vacuum pumps are combined with chambers and operational procedures into a wide variety of vacuum systems. Sometimes more than one pump will be used (in series or in parallel) in a single application… See more

Vacuum pumps are used in many industrial and scientific processes, including:
• Vacuum deaerator
• Composite plastic moulding processes;
• Croduction of most types of electric lamps, vacuum tubes, and CRTs where … See more

Old vacuum-pump oils that were produced before circa 1980 often contain a mixture of several different dangerous polychlorinated biphenyls (PCBs), which are highly toxic, carcinogenic, persistent organic pollutants. See more