AR-REG-II - Air/gas ratio control valve

Description

The AR‑REG‑II air/gas ratio regulator, produced by ESA-Pyronics is a en-88 certified balanced modulator that reduces air pressure while maintaining a constant ratio between combustion air and fuel gas, improving efficiency and reducing consumption. Unlike traditional ratio regulators, the AR‑REG‑II is installed on the air line and modulated through a pressure signal coming from the gas line.
The regulator uses a double-diaphragm system: a balancing diaphragm between the valve body and upper chamber, and a main diaphragm controlling valve movement based on upstream and downstream pressure. This ensures accurate regulation even with inlet pressure fluctuations.
Key technical specifications include: working pressure up to 200 mbar, operating temperature –10 °C to +70 °C, max air temperature 200 °C, 10:1 flow ratio, gas signal 0.4–70 mbar, and materials compliant with EN standards.
Main applications include combustion system revamping of tunnel furnaces & kilns with fixed air and modulated gas, where AR maintain stoichiometric air/gas ratio during modulation, and optimizing energy efficiency, with potential savings up to 10%. The document provides installation examples on industrial burners and a functional flow diagram.
Installation guidelines specify vertical mounting when possible, correct flow direction, use of metal impulse lines, and presence of a fine gas filter upstream. Field repairs are not allowed; calibration and servicing must be performed exclusively by ESA-Pyronics technicians.