Valves

Valves are flow-control components that open, close, or regulate the passage of gases and liquids through laboratory and vacuum systems. In the Questpair catalogue this category reaches beyond valves alone into the vacuum and lyophilization equipment they serve, so it carries freeze dryers, laboratory valves, and vacuum systems alongside chromatography accessories. New, used, and refurbished units are listed here; 75 percent of the listings are used. Prices run from EUR 20 to EUR 51.195, a spread wide enough to hold a single fitting at one end and a complete freeze-drying system at the other. The catalogue draws on 7 verified suppliers across 5 countries.