Aperval is a pilot-controlled pressure regulator for medium and low pressure applications.

Aperval is normally a fail open regulator and will open specifically under the following conditions:

  • If the  main diaphragm fails;
  • If there is no sensor line input.

This regulator is suitable for use with previously-filtered, non-corrosive gases.



Design pressure up to 25 bar (362 PSIG)
Design temperature -10°C to +60°C (+14 to +140°F) (higher or lower temperatures on demand)
Minimum working differential pressure 450 mbar (7.25 PSIG)
Accuracy class up to 2,5
Closing pressure class SG up to 5
Flanging 150 RF or RTJ according to ANSI B16.5 and PN 25/40 according to ISO 7005
Outlet pressure range of Wd 5 mbar to 9500 mbar (2"w.c. to 137.5 psig)
Available size DN 1" - 2" - 2"1/2 - 3" - 4"
Maximum working differential pressure 19 bar (275,5 Psig)
Range of inlet pressure bpu 0,5 to 25 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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