ORIFICE HOOD, DRILL # 49
Hood orifices are responsible for the amount of gas that flows to a burner. The orifice "regulates" or "limits" the transfer of gas by constricting the path through which the gas flows. They are brass fittings that screw into (spud) or onto (hood) gas valves. These orifices will have various hole sizes as as determined by the type of gas in use (either Propane or Natural Gas).
An orifice is any opening, mouth, hole or vent, as in a pipe, tube or a plate used to either regulate or measure the intake or output of a gas or liquid, e.g. "air orifice", or "orifice plate".
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