Description: Differential pressure at working conditions in the warranty point; Name: design diff press
Description: Differential pressure for the operating conditions at the guarantee point ; Name: Rated differential pressure 
Description: The norm in fixed relation to the feature being described. This defines the parameters that influence the contents of the correlated feature. Type and number of the norm with issue year and issue month must be given, e.g. DIN ISO 4711:YYYY-MM.; Name: Reference norm material, pumping medium