马达操作活门，用电马达来开，关和调制的活门。

Motor OPERATED valve, a valve using an electric motor for opening, closing and modulation.

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本文介绍了一种新型的电子伺服活门。它由脉冲调制器和机电作动器以及变截面活门组成。

This paper presents a new type of Electronic Servo valve (ESV) which includes the pulse width modulator, electro-mechanical actuator and variable section area valves.

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