Gas pressure regulator Aperflux 851

gas pressure regulator
gas pressure regulator
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Number of stages
Other characteristics
pilote-operated, with filter

Min.: 0.5 bar (7.25 psi)

Max.: 87.5 bar (1,269.08 psi)

Orifice diameter

Min.: 1 in

Max.: 10 in


Min.: 20 °C (68 °F)

Max.: 60 °C (140 °F)


Aperflux 851 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. 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 and retrofitting options in the field. The unique dynamic balancing system ensures an outstanding turn-down ratio combined with an extreme accurate outlet pressure control. Aperflux 851 is equipped, in standard configuration, with a double cage system. The first cage is designed to optimize the opening / Cg ratio, creating the base for the outstanding 500:1 turndown for this regulator. The second cage is designed to reduce noise emissions, resulting in lower noise than similar products equipped with an additional silencer. For extra low noise installation the additional silencer DB is always available.


*Prices are pre-tax. They exclude delivery charges and customs duties and do not include additional charges for installation or activation options. Prices are indicative only and may vary by country, with changes to the cost of raw materials and exchange rates.