Measuring nozzle is an appratus which is often used in the determination of the gas flow in roough vacuum pumps (such as water ring pump, reciprocating vacuum pump and sliding vacuum pump etc ) .

• 计量喷嘴常用于测定粗真空泵（如水环泵、往复式真空泵、滑阀式真空泵等）的气体流量的装置。