KSB Centrifugal Pump Lexicon –

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Standard nozzle

The standard nozzle is a differential pressure measuring instrument whose geometric dimensions, surface, and installation conditions comply with the requirements specified by standard DIN EN ISO 5167-3 (also see Standard orifice, Standard Venturi nozzle, Venturi tube). 

The standard nozzle has a narrowing, rounded profile (inlet) and a cylindrical throat. The specifications given in DIN EN ISO 5167-3 apply. See Fig. 1 Standard nozzle

The flow volume is calculated based on the differential pressure level measured and the flow coefficient (C) using the formula for differential pressure measuring instruments. The flow coefficient is depicted in a table in appendix A1 of DIN EN ISO 5167-3.

The overall pressure losses of the standard nozzle are less pronounced than those of the standard orifice for the same nominal diameter and diameter ratio. The lengths of the inlet sections correspond to those of the standard orifice.

  

  

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