16 Millimeter (mm) Diameter Nominal (DN) Size and 1.50 Pound Per Square Inch (psi) Standard Cracking Pressure VI Style Vacuum Flange Insert Check Valve

The Vacuum Flange Insert (VI) valve is designed to fit between ISO/NW/KF/QF vacuum flanges designed in accordance with DIN 28403, DIN 28404, ISO 1609, and ISO 2861. It is both a centering ring and a check valve. The compact design requires no additional space in the line. Its size makes it extremely economical when compared to full-bodied valves.

The VI valve can also be used as a low pressure relief valve under either positive or vacuum conditions by using the desired spring setting.