Heating furnace
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Is it better to control the fuel gas control valve using flow control or pressure control? Are there any regulations?
It is generally flow control: the amount of fuel gas passing through the heating furnace is controlled by regulating the flow rate, thereby achieving temperature control
During configuration, use a toggle switch to make the selection based on operational habits. Pressure control is recommended.
Either flow control or pressure control is acceptable; the key factor is whether the gas composition and pressure are stable. I’ve seen recently that using density for control is also quite reasonable.
The properties of the fuel gas remain relatively stable with little change, allowing for flow control; if these properties change frequently, then pressure control becomes necessary. Now, flow and pressure control are generally available on fuel gas lines.