Parker - Refrigerating Specialties: A40HA320A7W38X0XYXSN, 1-1/4", A4AZ, RA, 1-1/2" Weld Neck, ST

The A4AZ Inlet Pressure Regulator is the basic building block from which most Series A4 variations are made. This regulator incorporates the specially designed Modudapter to accommodate the Adaptomode bolt on modules, providing unique modular construction and many control valve variations with the use of a few modules and kits. See page 3 for an explanation of "Basic Adaptomode Functions", describing modules, module placement and schematic pilot circuit flow diagrams for all variations covered within this bulletin. The A4AZ regulator is a complete factory assembled and bench tested valve and, in itself, may be used as a basic inlet pressure regulator. In addition, this valve can easily be modified in the field to perform the function of the A4AS, A4AB or A4AD valve variations.