The Kunkle Model 218/228 is a bronze trim UL Listed and FM approved relief valve designed for fire pump installations. It is easily adjustable with the provided hand-wheel. Maximum set pressure of 175 PSI with the 125# inlet flange and a maximum set pressure of 200 PSI with a 250# inlet flanges.
 
Pressure Ratings Class 125# Flanged
200 PSI Maximum Inlet Pressure
60-175 PSI Adjustable Set Relief Pressure Range
 
Pressure Rating Class 250# Flanged
200 PSI Maximum Inlet Pressure 
60-200 PSI Adjustable Set Relief Pressure Range