Varian VHS-4 (VHS4) NRC 0183 Rebuilt Diffusion Vacuum Pump
These Varian model VHS-4 (VHS4) NRC 0183 diffusion high vacuum pumps are the primary industrial standard for high vacuum pumping mechanism. The Varian VHS-4 diffusion pumps have a high pumping speed for all gases and low cost per unit pumping speed when compared with other types of pump used in the same vacuum range. The bulge contour in the Varian VHS-Series maintains lower pressure for the process and increases the gas captured. VHS pumps feature glass fill and drain assemblies for easy maintenance of pump fluid and continuous monitoring. Finned boilers increase the surface area which prolongs fluid life. The full fractionating design allows vaporized fluid to be fractionated in the boiler and jet assembly. Contamination and decomposition products are pumped away and only the purest vapor reaches the top jet, assuring highest speed and lowest backstreaming These Varian diffusion pumps have been fully rebuilt. The heat and electrical components were replaced where needed and they have been repainted.