Pilot operated pressure regulators

Aperflux 851

Aperflux 851 is pilot-controlled pressure regulator for medium and high pressure applications.

Aperflux 851 is normally a failed open regulator and specifically will open under the following conditions:

  • breakage of main diaphragm;
  • lack of feeding to the pilot loop.

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


Range of inlet pressure bpu 1,3 - 85 bar
Outlet pressure range of Wd 12 to 1,073 PSIG (depending on the installed pilot)
Accuracy class up to 5
Closing pressure class SG up to 10%
Flanging Class 150 RF according to ANSI B16.5 and PN16 according to ISO 7005
Available size DN 1", 2", 3", 4", 6", 8", 10"
Design pressure up to 19,6 bar
Maximum working differential pressure 100 bar
Minimum working differential pressure 0.5 bar - Recommended > 2 bar
Design temperature -20°C a +60°C (higher or lower temperatures on request)