The K-Max rotary control valves from Leslie Controls offer greater than 100:1 rangeability; stable, bi-directional flow; and enclosed actuator linkage with gasketed steel covers for safety and corrosion protection. The durable steel case diaphragm actuator gives high thrust, low friction, accurate control and is more fire-resistant than aluminum actuators, according to the company. They are available in 1-in. through 8-in. sizes with ANSI 150-300-600 ratings in carbon steel, 316 stainless, alloy 20, hastelloy C and titanium.