K-Max Rotary Control Valve Source: Leslie Controls Inc. CHEM SHOW '99: The K-Max Rotary Control Valve features flangeless (wafer) installation, slip-on flanges, or integrally cast flanges. CHEM SHOW '99: The K-Max Rotary Control Valve features flangeless (wafer) installation, slip-on flanges, or integrally cast flanges. These are universal application valves with the control characteristics of a globe valve and a straight-through flow path. The valve is suitable for liquids, gases, steam, and slurries. They have greater than 100:1 rangeability and stable, bi-directional flow. The durable Steel-Case Diaphragm actuator gives high thrust, low friction, accurate control and is much more fire-resistant than aluminum actuators.