Laboratory Fume Hood Venturi Butterfly Valve Multifunctional Intelligent Control VAV Integrated Variable Air Volume System - AliExpress
Amazon.com: VAV 3/8" Ball Valve Full Port, 316 Stainless Steel, with Blue Vinyl Insulation Handle, NPT Female x Female Thread, 1000 WOG for Water, Oil, and Gas with Lockable Lever (2pcs) :
Honeywell Kromschroder VAV Variable Gas Air Ratio Control Solenoid Valve - Marshall W Nelson and Associates Inc
Constant Air Valve/Vav Variable Air Valve/PP Series Venturie Set Air Volume Control Valve - China PP Valve, Constant Valve | Made-in-China.com
2 Pack VAV 11/4 " Ball Valve Full Port, 316 Stainless Steel, 1000 WOG for Water | eBay