Welch Vacuum Technology, once a part of Sargent Welch Scientific Co, is a global leader in the OEM compressor and vacuum pump industries. Since the sale of its first vacuum pump, 100 hundred years ago, the Welch vacuum pump has become a standard facet on the vacuum production lines. The line includes oil lubricated rotary vane, dry piston, and diaphragm vacuum pumps. The company has since changed its name to Welch Rietschle Thomas.

The Sargent Welch pump is widely used today. They have been employed for chemical and biological laboratories, high vacuum manufacturing, air conditioning/ refrigeration, aerospace, and electronics production. Most commonly the Welch vacuum pump is remarkably well known in the chemical and life science research laboratories.

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