原文：
阀门在生产过程中，为了使介质的压力、流量等参数符合工艺流程的要求，需要安装调节阀门机构对上述参数进行调节。调节机构的主要工作原理，是靠改变阀门阀瓣与阀瓣与阀座间的流通面积，达到调节阀门上述参数的目的。属于这类阀门 的统称为控制阀，其中分为依靠介质本身动力驱动的称为自驱式控制阀如减压阀、稳压阀等，凡{lx1}上来动力驱动的（如电力、压缩空气和液动力）称为他驱式控制阀阀门，如电动阀门、气动阀门和液动阀门等。

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译文：
Valve in the production process, in order to make the medium of pressure and flow parameters meet the process requirements, need to install the regulator valve body to adjust these parameters. The main working principle of adjusting mechanism is by changing the valve disc with the valve flap and valve seat between the circulation area, the above parameters to achieve the purpose of regulating valve. Such valves are referred to as control valves, which are divided into power-driven dependent media itself is called self-drive control valve such as valve, the regulator valve, all leading up power-driven (such as electricity, compressed air and fluid power) as his driving style control valve valve, such as electric valves, pneumatic valves and hydraulic valves.