Siemens 599-01000 VALVE ACTUATOR, PNEUMATIC, 12-IN., 5 PSI SPAN, 1-1/2 IN. STROKE, 1/4-IN. NPTSiemens 599 01000 Valve Actuator, Pneumatic, 12 in., 5 psi span, 1 1 2 in. Stroke, 1 4 in. NPT 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 1 1 2 in. stroke, a fixed span spring range of 5 psi, a medium temperature range of 25 to 366F ( 4 to 186 C), a max diaphragm pressure of 35 psi (241 kPa), and a 1 4 in. NPT air