The 226-458 is a proportionator/zero governor regulator, also known as the Dungs FRG 705/6, with a 1/2" NPT connection size. It has an adjustable setpoint spring and a non-adjustable counter spring that is ideal for applications requiring steady & precise regulation of outlet pressure. The regulator is designed for low-flow or high-turndown scenarios, making it a reliable choice for maintaining consistent gas-to-air ratios in industrial and commercial systems.
The Dungs FRG 705/6 proportionator/zero governor regulator is suitable for industrial and commercial heating applications with natural gas, propane, butane, air, and inert gases. The unit ensures a constant gas-to-air ratio, adjusting gas flow in proportion to combustion airflow, which is essential for maintaining efficiency in heating systems. It can also serve as a zero governor, reducing gas pressure to atmospheric levels or slightly above or below.
The 226-458 is easy to install with a factory-installed vent limiter and test ports for inlet and outlet pressure. It also includes a connection for the air impulse line. The 229-817 regulator spring replacement part is also available.
| Ambient Temperature Rating | +5 to +160°F (-15 to +70°C) |
|---|---|
| Output Pressure Range | 4 to 60 in. W.C. (10 to 150 mbar)(PROPORTIONATOR)/-2 to 2 in. W.C. (-5 to 5 mbar) (ZERO GOVERNOR) |
| Optimal Input Pressure Range | 2 to 82 in. W.C. (5 to 200 mbar) (PROPORTIONATOR)/2 to 20 in. W.C. (5 to 50 mbar) (ZERO GOVERNOR) |
| Maximum Operating Pressure | 7 PSI (500 mbar) Factory Rating; 5 PSI (350mbar) |
| Maximum Body Pressure | 15 PSI (1000 mbar) |
| Housing Material | Aluminum |
| Seals and Diaphragms Material | NBR |
| Approvals | CSA-certified |
| Pipe Connection Size | 1/2" NPT |
| Installation Position | Vertically Upright or Horizontally |
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