Norgren 97100 namur series 52 and 32 indirect solenoid actuated spool valves norgren 9710000305002400 this indirect solenoid actuated spool valve is designed for use as single and dual acting actuators with namur flange pattern the valve functions as a 52 way spring return and comes with an adaptor plate to convert it to a 32 way valve the valve features exhaust air recirculation to the actuator spring chamber as well as crossover free switching with the switch over function guarantee