Pyronics BZR-B-300 is designed with an adjustable compensation spring to bias the regulator providing a smooth transition to excess air operation at low fire. Using a gas adjuster downstream of a negative biased regulator, high fire can be set to stoichiometric conditions. As the system is turned down, the spring bias will subtract from the combustion air pressure, adjusting the air/gas ratio, and causing the burner to go lean. Adjusting the screw under the cap assembly permits biasing the gas/air ratio from high fire to low fire at a fixed, controlled rate.

As shipped, the regulator is set at zero bias.

Features and Benefits

  • Accuracy: Low – Flow: 0.1″ W.C., Full – Flow: 0.3″ W.C.
  • Turndown: up to 20:1
  • Continuous operation to 300°F
  • For use with High Sulphur Gases
  • All units factory tested and sealed before shipment
  • Maximum inlet pressure: 2.0 psig
  • Minimum pressure drop through regulator: 4.0″ W.C.
  • Sensitivity – Responds to signal pressure differential as low as 0.04″ W.C.
  • Adjustable spring bias from: + 0.3/-5.0″ W.C.