Reflux 819


Reflux 819 is a pilot-operated gas pressure regulator.

It is particularly suitable for high-pressure transmission systems and for medium pressure natural gas distribution networks, and it can be used with previously filtered non-corrosive gases.

Reflux 819 is classified as Fail Close according to the European Standard EN 334.


  • Accuracy class: up to 1
  • Available size DN: 1″, 2″, 3″, 4″, 6″, 8″, 10″, 12″
  • Closing pressure class SG: up to 2.5
  • Design pressure: up to 100 bar
  • Design temperature: from -10 °C to +60 °C (higher or lower temperatures on demand)
  • Flanging: class 150, 300, 600 RF or RTJ according to ASME B16.5 and PN 16 according to ISO 7005
  • Minimum working differential pressure: 450 mbar
  • Outlet pressure range of Wd: from 0.3 to 74 bar
  • Range of inlet pressure bpu: from 0.5 to 100 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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