Reflux 819/FO


Reflux 819/FO is a pilot-operated gas pressure regulator classified as Fail Open according to the European Standard EN 334.

Its use is strongly recommended in high-pressure transmission systems and in medium pressure natural gas distribution networks. It is suitable for use with previously filtered non-corrosive gases.


  • Accuracy class: up to 1
  • Available size DN: 1″, 2″, 3″, 4″, 6″, 8″, 10″, 12″
  • Closing pressure class SG: up to 5
  • Design pressure: up to 102 bar
  • Design temperature: from -20 °C to +60 °C
  • Flanging: class 150, 300, 600 RF or RTJ according to ASME B16.5 and PN 16 according to ISO 7005
  • Minimum working differential pressure: 2 bar when used alone, 0.5 bar when used in combination with a Reflux 819/FC monitor
  • Outlet pressure range of Wd: from 1 to 74 bar
  • Range of inlet pressure bpu: from 3 to 102 bar


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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