Proportional - Uses electrical input signal to control pressure or flow output.

比例—使用电输入信号来控制压力或流量输出。

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The electrical signal is amplified electronically, with an increase in signal power occurring at the expense of the input AC power to the amplifier.

电信号被用电子的方法放大，即利用输入放大器的交流电能将信号的功率放大。

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Imitating the project of electrical and hydraulic proportional valve, a CAM mechanism is adopted to input and convert the signal of crane arm's radius changing.

系统的控制信号输入方式借鉴电液比例阀方案，采用凸轮杠杆机构，从而利用了凸轮容易实现任意函数关系转换的优点。

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