Welch Belt-drive vacuum pumps are known for their ruggedness world-wide in the most demanding applications.Belt-drive vacuum pump are available in three types: DUOSEAL, CHEMSTAR and CAPTURE. DUOSEAL vacuum pumps are used in most common lab and industrial applications. DUOSEAL pumps are available in 6 models of two-stage vacuum pumps and 2 models of one-stage pumps.CHEMSTAR pumps are designed to tolerate harsh chemical contamination with vital parts corrosion resistant and uses Welch Gold oil, a synthetic pump oil designed to resist chemical attack.CAPTURE pump is used for refrigerant recovery and transfer.On special requests, both DUOSEAL and CHEMSTAR vacuum pumps can be fomblinized for oxygen service.Applications: Schlenk lines, freeze dryers, glove boxes, degassing, vacuum ovens, high boiling point distillations, HVAC service.
CRVpro vacuum pumps are two-stage direct-driven vacuum pumps. They are nine models of CRVpro available with free air displacement from 1.8 cfm to 45.9 cfm. Ultimate pressure to 2x10-3 torr.Depending on model, motor options include 1 Ph TEFC, 3 Ph TEFC, and 1 Ph ex proof motors. Available on request are fomblinized CRVpro pumps for oxygen service. Contact us for more information.Applications: Freeze dryer, short path, vacuum oven, glove box, schlenk line, mass spectrometer, HVAC service, surface coating, degassing.
Reliable WOB-L Piston pumps are perfect for many common laboratory vacuum applications. Features: Vacuum and Pressure - to 100 Torr (26"Hg). Includes Vacuum and Pressure Regulators and Gauges - simple to adjust and monitor vacuum level and delivery pressure.
Inlet Water Trap - float ball rises to seal off pump from accidental ingestion of water. Muffler quiets pump and filters discharge air. For use with dry or aqueous vapor applications only.
Clean operation (oil free), low cost of ownership, highest reliability – these are just a few benefits that customers can appreciate when they use a diaphragm pump for laboratory or industrial applications. With a broad range of diaphragm pumps – ultimate vacuum from 75 to 1 mbar and peak flow rates up to 138 l/min – Welch offers specific pump families and models for a variety of uses.
Diaphragm pumps work completely without oil which has several advantages for the user, Less maintenance compared to other technologies saves time and money, Dry vacuum allows cleaner workplace and environment, Uncontaminated pumping of gases results in cleaner samples and no risk of oil back-streaming.
