Terval/R is one of the pilot-operated gas pressure regulators by Pietro Fiorentini.

This device is suitable for use with previously filtered non-corrosive gases, and it is mainly used for medium and low pressure natural gas distribution networks.

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


  • Accuracy class: up to 2.5
  • Available size DN: 2″, 2″ 1/2, 3″, 4″
  • Closing pressure class SG: up to 5
  • Design pressure: up to 25 bar
  • Design temperature: from -20 °C to +60 °C (higher or lower temperatures on demand)
  • Flanging: class 150 RF or RTJ according to ASME B16.5 and PN 25 and 40 according to ISO 7005
  • Minimum working differential pressure: 0.1 bar
  • Outlet pressure range of Wd: from 8 to 12000 mbar, depending on the installed pilot
  • Range of inlet pressure bpu: from 0.5 to 25 bar


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


Technical Manual

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Technical brochure

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