The size and pressure range for 4200 series spring safety valves according to API 526 standard is from size 1 2D to 8 10T and from class 150# to class 2500#.
The size and pressure range for 4400 series spring safety valves according to API 526 standard is from size 1 2D to 8 10T and from class 150# to class 2500#.
(spring loaded valves 4500 series) 4500 series safety valve for use on steam services (drum and super heater water tube boilers) designed and manufactured according to ASME Section I code