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).


Design pressure 3 ÷ 100
Design temperature -46°C to +60°C
Minimum working differential pressure 2 bar when used alone; 0,5 bar when used in combination with a Reflux 819 FC monitor
Accuracy class up to 1%
Closing pressure class SG 5% to 1% depending on outlet pressure
Flanging class 150-300-600 RF or RTJ according to ANSI B16.5 and PN 16 according to ISO 7005
Outlet pressure range of Wd 1 to 74 bar
Available size DN 1", 2", 3", 4", 6", 8", 10"
Maximum working differential pressure 99 bar
Range of inlet pressure bpu 3 to 102 bar

News and articles

26 September 2017

A brief presentation of our modern plant in Desenzano del Garda

A brief presentation of our modern plant in Desenzano del Garda, where our gas pressure regulators are designed, manufactured, tested and shipped around the world.

03 August 2017

Technical Newsletter - Reflux 819 12 "

Reflux 819 12” - Our biggest pilot regulator


Pietro Fiorentini inc.

With each installation created by Pietro Florentini, we increase our experience in the use of new technologies and are improving, which allows us to look to the future with confidence.

We constantly improve our quality and competitiveness, taking into account the highest requirements of our customers.

Our company is a leader in the creation of high-tech equipment and services for the transportation and use of natural gas, which allows us to direct our research to solve all kinds of problems.

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