Images are representations only.

Aperflux 851 Pressure Regulator

Brand: Pietro Fiorentini S.p.A.
When requesting information, please download the Fillable PDF to provide details about your regulator use case. Instructions for completing the form are found in the footer of the document. Once completed, please upload the document with the Request for Information.
The Aperflux 851 is pilot-controlled pressure regulator for medium and high pressure applications.

Aperflux 851 is normally a fail open regulator and will open specifically under the following conditions:
  • If the main diaphragm fails
  • If there is no feed to the pilot loop
This regulator is suitable for use with previously-filtered, non-corrosive gases.
Features
  • Design pressure: up to 14,50 PSIG (100 bar) 
  • Temperature: Pietro Fiorentini regulators are suitable for a minimum operating ambient temperature -40° to 140° F with a Carbon Steel Body
  • If the following conditions are met: 
    • Inlet flowing gas temperature shall be always higher than -4° F
    • Inlet flowing gas shall be filtered, clean and without any liquid impurities
  • Range of inlet pressure bpe: 18.8 to 1,230 PSIG (1.3 to 85 bar) 
  • Range of outlet pressure Wh: 12 to 1,073 PSIG (0.8 to 74 bar) depending on installed pilot 
  • Minimum working differential pressure: 7.25 PSIG (0.5 bar) - Recommended > 30 PSIG (2 bar) 
  • Accuracy class AC: up to 1% > Closing pressure class SG: from 5% to 1.5% depending on outlet pressure 
  • Available size DN: 1” -2” -3” -4” -6” -8” -10” 
  • Flanging: class 150-300-600 RF or RTJ according to ANSI b16.5 and PN16 according to ISO 7005
show more
The Aperflux 851 is pilot-controlled pressure regulator for medium and high pressure applications.

Aperflux 851 is normally a fail open regulator and will open specifically under the following conditions:
  • If the main diaphragm fails
  • If there is no feed to the pilot loop
This regulator is suitable for use with previously-filtered, non-corrosive gases.
Features
  • Design pressure: up to 14,50 PSIG (100 bar) 
  • Temperature: Pietro Fiorentini regulators are suitable for a minimum operating ambient temperature -40° to 140° F with a Carbon Steel Body
  • If the following conditions are met: 
    • Inlet flowing gas temperature shall be always higher than -4° F
    • Inlet flowing gas shall be filtered, clean and without any liquid impurities
  • Range of inlet pressure bpe: 18.8 to 1,230 PSIG (1.3 to 85 bar) 
  • Range of outlet pressure Wh: 12 to 1,073 PSIG (0.8 to 74 bar) depending on installed pilot 
  • Minimum working differential pressure: 7.25 PSIG (0.5 bar) - Recommended > 30 PSIG (2 bar) 
  • Accuracy class AC: up to 1% > Closing pressure class SG: from 5% to 1.5% depending on outlet pressure 
  • Available size DN: 1” -2” -3” -4” -6” -8” -10” 
  • Flanging: class 150-300-600 RF or RTJ according to ANSI b16.5 and PN16 according to ISO 7005

Specifications

Accuracy Class

  • Up to 5

Available Size DN

  • 1”
  • 2”
  • 3”
  • 4”
  • 6”
  • 8”
  • 10”

Closing Pressure Class SG

  • Up to 10 %

Design Pressure

Design Temperature

  • -20° to +60° C

Flanging

  • Class 150 RF According to ANSI B16.5 and PN 16 According to ISO 7005

Maximum Working Differential Pressure

  • 87.5 bar

Minimum Working Differential Pressure

  • 0.5 bar

Outlet Pressure Range of Wd

  • 12 to 1,073 psig

Range of Inlet Pressure Bpu

  • 1.3 to 85 bar