Apperflux 851 gas pressure regulator

Apperflux 851 gas pressure regulator
Get Best Offer
PT indotama niaga teknik as distributor gas pressure regulator in indonesia offer product from brand pietro fiorentini namely Apperflux 851 gas pressure regulator, to meet the need industrial and manufacture
Brand :

Pietro Fiorentini

Category :

Gas Equipment

Share :

Distributor Apperflux 851 gas pressure regulator

Apperflux 851 gas pressure regulator

Modular Design

The modular design of Aperflux 851 pressure regulators allows retrofitting of an emergency monitor PM/819, slam shut valve and or silencer on the same body. The Aperflux 851 regulator is Truly a “top entry design” which allows ease of maintenance or retrofitting options in the field. The unique dynamic balancing system ensures an outstanding turn down ratio combined with an extreme accurate outlet pressure control.

Main Features

The APERFLUX 851 pressure regulator is a regulator of the piloted type for medium and high pressures. The APERFLUX 851 is a fail open type regulator and therefore opens in the event of:

- rupture of the main diaphragm;

- rupture of the pilot diaphragm/s;

- rupture of the pilot gasket;

- pilot circuit supply failure. The main features of this regulator are:

  • design pressure: up to 85 bar; (Note 1)
  • design temperature: -20 °C to +60 °C;
  • environmental temperature: -20 °C to +60 °C;
  • range of the inlet pressure bpe: 1 to 80 bar;
  • possible regulation range Wh: 0.6 to 74 bar (on the basis of the pilot installed);
  • minimum differential pressure: 0.5 bar;
  • precision class AC= up to 1.5;
  • closing pressure class SG: up to 2.5 


Body Cast steel ASTM A352 LCC for classes 300 and 600 ASTM A216 WCB for classes 150 and PN16 

Head covers Rolled or forged carbon steel

Diaphgram Vulcanized rubber

Valve seat Stainless steel for DN ≤3” Carbon Steel with seal edge in stainless steel for size ≥ 4”

Seals Nitril rubber

Compression fittings According to DIN 2353 in zinc-plated carbon steel


Aperflux 851 regulators are equipped with series 300 pilot as listed below:

  • 302/. control range Wh: 0.8 to 9,5 bar; (11 to 138 psig)
  • 304/. control range Wh: 7 to 43 bar; (100 to 625 psig)
  • 305/. control range Wh: 20 to 60 bar; (290 to 870 psig)
  • 307/. control range Wh: 41 to 74 bar; ( 595 to 1073 psig) Pilots may be adjusted manually or remotely


Apperflux 851 gas pressure regulator


Accuracy class: up to 5
Available size DN: 1″, 2″, 3″, 4″, 6″, 8″, 10″
Closing pressure class SG: up to 5
Design pressure: up to 102 bar
Design temperature: from -20 °C to +60 °C (higher or lower temperatures on demand)
Flanging: class 150, 300, 600 RF or RTJ according to ASME B16.5 or PN 16, 25, 40 according to ISO 7005
Minimum working differential pressure: 0.5 bar, recommended > 2 bar
Outlet pressure range of Wd: from 0.8 to 74 bar, depending on the installed pilot
Range of inlet pressure bpu: from 1.3 to 85 bar
Where can you use it: