Mooney Controls Flowgrid® and FlowMax® pilot operated pressure regulators. The Flowgrid® Regulator is a flexible element (or "boot") style regulator designed to control gases or liquids. The FlowMax® regulator combines high capacity with a low minimum differential. All valves incorporate top-entry design for ease-of -maintenance and the accurate Series 20 Pilot regulator which features a removable cartridge or Body-Insert.