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.
NOTE: USP Class VI o-rings can be supplied with certification.
|DN||Size Code||DIM A||DIM B||DIM C||DIM D||Orifice Diameter|
NOTES (DIMENSIONS TABLE)*Maximum nominal dimension for a fully open valve with no spring. Consult factory for more information.
|* 316 Stainless Steel (SS)|
|Body Material||Availability||Non-Shock Pressure-Temperature Rating|
|316 Stainless Steel (SS)||Standard||FULL VACUUM-ATMOSPHERIC @ 100° F|
Seat material and spring material selection may limit the recommended service temperature.
See seat ratings, spring ratings, and body material ratings for their respective recommended service temperatures.
Consult the factory for reduced P-T rating above 100 °F. Standard spring material is 316 Stainless Steel.
PRESSURE DROP PSI
FOR WATER AT 72°F
WATER FLOWRATE - GPM
Note: All flow curves and Cv values presume the valves are fully open with 1/2 PSI cracking pressure springs. Consult the factory for more information.
|DN||PART NUMBER||ALL MATL|
Valve weights are approximate.
|Valve Style||Size Range||Body Materials
|Allowable Seat Materials
|Standard Cracking Pressures
|Standard Spring Material
|VI||3/4" - 1-1/2"||316 SS||AFLAS®
"Metal to Metal"
"Metal to Metal"