NG Valve & LPG Valve

  • There are differences in flow and design between gas valves suitable for LPG (liquefied petroleum gas) and NG (natural gas)

  • 1. Flow Rate Difference: LPG Usually Has a Lower Flow Rate

    LPG (Liquefied Petroleum Gas) has a much higher calorific value than NG (Natural Gas), which means it produces more energy per unit volume.

    As a result, to achieve the same heating power, LPG requires a smaller gas flow rate.

    For example:
    Natural gas has a calorific value of around 35–40 MJ/m³
    LPG has about 90–100 MJ/m³

    Therefore, you need less LPG volume than NG for the same burner output.

  • 2. Valve Orifice and Nozzle Design

    LPG valves typically have smaller orifices or nozzles to reduce the gas flow accordingly.

    The valve body might look the same, but internal components like restrictors or jets differ, to match the density and pressure of the specific gas. Sometimes the orifice is on valve, sometimes is fixed on burner base. It is all depending on your machine design.

    LPG is usually supplied at a higher pressure (around 2.75 kPa), while natural gas is typically around 1.0–1.5 kPa. So valves for LPG need finer control to handle the higher energy content and pressure. As a professional gas valve manufacturer, we produce valves that can adapt to different gas pressures according to your requirements. Our testing department requires that all valves can meet the pressure of 30kPa. Even if you need valves to be compatible with higher gas pressure, we can customize.

  • 3. Dual-Fuel vs. Dedicated Valves

    Some high-quality gas valves are dual-fuel compatible, meaning they can be adjusted (e.g., by changing the nozzle or adjustment screw) to work with both NG and LPG.

    Cheaper valves may be designed for only one type of gas and should not be used interchangeably.

  • Understanding the knowledge about NG valves and LPG valves is crucial for ensuring safe, efficient, and reliable gas system operation. While both types of valves serve the common purpose of controlling gas flow, they differ in design, material compatibility, and pressure requirements due to the differing properties of NG and LPG. Proper selection, installation, and maintenance of these valves can prevent hazardous situations, optimize performance, and extend the lifespan of gas equipment. As the demand for energy-efficient and safe gas systems continues to grow, knowledge of NG and LPG valve functionality becomes increasingly essential for technicians, engineers, and end-users alike.

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