Reflux 819
Pilot-operated gas pressure regulators

Reflux 819

Reflux 819 is a downstream pilot-controlled pressure regulator for medium and high pressure applications.
It is particulary suitable for use within the framework of installation for the distribution of natural gas, as well as for supplying network for civil and industrial use.

The Reflux 819 regulator is classified according to the European standard EEN 334 as a regulator which reacts in closure (Fail to close).


Technical data
  • Accuracy class
  • Available size DN
  • Closing pressure class SG
  • Design pressure
  • Design temperature
  • Flanging
  • Minimum working differential pressure
  • Outlet pressure range of Wd
  • Range of inlet pressure bpu
  • Maximum working differential pressure
  • up to 1%
  • 1"- 2"- 3"- 4"- 6"- 8"- 10"- 12"
  • 5% to 1% depending on outlet pressure
  • up to 1,450 PSIG
  • -10°C to +60°C (+14 to +140°F) (higher or lower temperatures on demand)
  • 150-300-600 RF or RTJ according to ANSI B16.5 and PN 16 according to ISO 7005
  • 7.25 PSIG
  • 5 to 1,073 PSIG
  • 11.6 to 1,450 PSIG
  • 99,7

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Pietro Fiorentini is a global leader in designing and construction of components and systems for natural gas.

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