C25N-B is a medium pressure gas governor that is compact yet delivers a large flow rate through a unique structure. A double diaphragm structure keeps the secondary pressure stable over a wide flow rate range. It is used for city gas, natural gas and LPG, with inlet 25A and outlet 40A (JIS flange).
| Working Fluid | City gas / natural gas / LPG |
| Working Pressure | 0.1 to 0.2 MPa (secondary pressure 1.5 to 5 kPa, flow rate 2 to 40 m³/h) / 0.1 to 0.3 MPa (secondary pressure 5 to 60 kPa, flow rate 10 to 120 m³/h) |
| Secondary Pressure Fluctuation Range | Within 20% |
| Flow Rate Conversion Coefficient (multiply flow rate in table) | Natural gas (13A) 1.0, city gas (6B/6C) 1.09, propane 0.63, butane 0.57, butane-air (6A) 0.72 |
| Ambient Temperature | -20 to 60 °C (no freezing) |
| Mounting Orientation | Unrestricted |
| Connection / Port Size | Flange (JIS10KRF) / inlet 25A, outlet 40A |
| Weight | 7.5 kg |