Norval by Pietro Fiorentini is a direct-operated gas pressure regulator.

Suitable for use with previously filtered gaseous fluids, it is mainly used for medium and low pressure natural gas distribution networks.

It is classified as Fail Open according to the European Standard EN 334.


  • Accuracy class: up to 5
  • Available size DN: 1″, 1″ 1/2, 2″, 2″ 1/2, 3″, 4″, 6″, 8″
  • Closing pressure class SG: up to 10
  • Design pressure: up to 16 bar
  • Design temperature: from -20 °C to +60 °C
  • Flanging: class 150 RF according to ASME B16.5 and PN 16 according to ISO 7005
  • Outlet pressure range of Wd: from 8 to 4400 mbar for DN up to to 4″, from 12 to 1800 mbar for DN 6″ and 8″
  • Range of inlet pressure bpu: from 0.1 to 19 bar for DN up to 3″, from 0.1 to 8 bar for DN 4″, 6″ and 8″


The configuration options can be compounded and aggregated differently. Please refer to the technical manual for all available combinations.
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Technical Manual

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Technical brochure

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