Siemens 599-01050 VALVE ACTUATOR, PNEUMATIC, 8-INCH, 5 PSI SPAN, 3/4 INCH STROKE, 1/8-INCH NPTSiemens 599 01050 Valve Actuator, Pneumatic, 8 inch, 5 psi span, 3 4 inch Stroke, 1 8 inch NPT This Flowrite 599 Series 8 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, normal duty service of 25 to 300 F ( 4 to 149 C), a max diaphragm pressure of 35 psi (241 kPa), and a 1 8 in. NPT air