... pumps are also used in making electrical vacuum cases, vacuum jointing, printing, photoengraving, food packaging, vacuum forming, refrigeration equipment repair and instruments or ... . d. 2XZ-2 with small caliber, 2XZ-4 pump with vacuum drying oven, freezing dry machine and printing machine. e.Euipped ... small caliber transforming joints and KF joints.3. Parameters data Double stage acuum pump