Reflux 819/FO
Pilot-operated gas pressure regulators

Reflux 819/FO

Reflux 819/FO 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/FO regulator is classified according to the European standard EEN 334 as a regulator which reacts in opening (Fail to open).


Technical data
  • Accuracy class
  • Available size DN
  • Closing pressure class SG
  • Design temperature
  • Flanging
  • Maximum working differential pressure
  • Minimum working differential pressure
  • Outlet pressure range of Wd
  • Range of inlet pressure bpu
  • up to 1%
  • 1", 2", 3", 4", 6", 8", 10"
  • from 5% to 1% depending on outlet pressure
  • -10°C to +60°C
  • class 150-300-600 RF or RTJ according to ANSI B16.5 and PN 16 according to ISO 7005
  • 99 bar
  • 2 bar when used alone; 0,5 bar when used in combination with a Reflux 819 FC monitor
  • 1 to 74 bar
  • 3 to 102 bar

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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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