两种常见形式是固定节流阀式或节流管式，以及节流膨胀阀。
Two common types are the fixed orifice, or the orifice tube, and the thermostatic expansion valve.
电动节流阀用于常压燃烧系统的火焰控制，应用于燃气和空气阀门同步电动调节或固定空气控制场合。
Motorized Throttling valves are used to control flames in atmospheric burner systems, in applications where both air and gas valves are motorized or in applications working 'air constant'.
电动节流阀用于常压燃烧系统的火焰控制，应用于燃气和空气阀门同步电动调节或固定空气控制场合。
Motorized Throttling valves are used to control flames in atmospheric burner systems, in applications where both air and gas valves are motorized or in applications working 'air constant'.
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