Featuring back pressure regulator mounted onto it, Model ALR-1 uses auxiliary air supply, such as air from compressor, to feed cover dome. Supply air must be environmentally safe since it will be constantly bleeding to atmosphere. Customers can adjust setting at point of use with airset or through control room when mounted with I/P transducer. Suitable for applications when set points vary frequently, Model ALR-1 can replace control valves on pressure control applications.