比例调节阀是指在执行的过程中采用比例和积分两种计算综合起来的电动阀门，计算值离设定值越远，步进马达动作越快，基本是一个衰减的正弦波形。
这需要比例调节阀和流量测量形成的回路控制。
Flow is measured via an orifice plate metering run with a differential pressure transmitter providing feedback to the control loop.
调节阀能够保证从冷启动到预热空气一直保持恒定的空气-燃料比例。
The regulator holds a constant air-fuel ratio from cold start-up through hot air operation.
这抵消了调节阀比例阀机械器件精度相对较低带来的价格优势，综合可靠性较低。
This is offset by a proportional valve and mechanical parts caused by the relatively low accuracy of price advantage, integrated reliability is low.
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