Profile: W.A Kates Company manufactures flow rate controllers for every type of application. From air to zinc hydrosulfate, our controllers provide a simple alternative for numerous complex flow applications. The Kates automatic flow rate controller is installed in a wide variety of liquid and gas applications. The PVC flow rate controller works under the same basic principle as the stainless steel unit. We develop Solvair, which is a device to reduce solvent consumption by over 50 percent, while reducing the time required to make color change.