This Flowrite 599 Series 12-inch Pneumatic Valve Actuator is designed to be used with Flowrite 599 Series valves in liquid and steam service applications. This valve actuator has a 3/4 in. stroke, a fixed span spring range of 5 psi, a medium temperature range of 25 to 366°F (-4 to 186 °C), a max diaphragm pressure of 35 psi (241 kPa), and a 1/4 in. NPT air connection. Other features of this valve actuator include field-adjustable start point for sequencing and a completely enclosed actuator housing which protects the diaphragm, spring and start point adjuster.