The V1000 series is simple, inexpensive and reliable. Valves range in size from 1/4" through 3" with matching operators. V1000 vacuum seal-off valves provide an extra dimension to the vacuum system designer because they are compact, vacuum tight, have excellent capacitance and offer positive pressure relief. The basic weld on installation and simple operation will reduce installation and evacuation time, improving vacuum reliability and reducing product cost. An optional integrated port on the side of the 1/2" and 1" standard seal-off valves allows installation of vacuum sensor, eliminating the need for drilling and welding on the system. Designed for use with vacuum-insulated piping systems, manifolds, flex lines, dewars, tanks, chambers, furnaces and any fabrication that requires a vacuum jacket.