Norval H


The Norval H by Pietro Fiorentini is a direct-operated gas pressure regulator. This device is suitable for 100% hydrogen applications.

It is used in medium and low-pressure gas distribution networks.

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

Click here to see the product page in the NG version / NG-H2 blending (up to 20%) version.


  • Accuracy class AC: up to 5 (depending on working conditions)
  • Nominal sizes DN: 1″, 1″ 1/2, 2″, 2″ 1/2, 3″, 4″, 6″, 8″
  • Lock-up pressure class SG: up to 10 (depending on working conditions)
  • Design pressure: up to 18.9 bar
  • Design temperature: from -20 °C to +60 °C
  • Connections: class 150 RF according to ASME B16.5 and PN 16 according to ISO 7005
  • Range of downstream pressure Wd: from 0.008 to 4.4 bar for DN up to to 4″, from 0.012 to 1.8 bar for DN 6″ and 8″
  • Inlet pressure range bpu: from 0.1 to 18.9 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.
Slam shut
Upside down



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