控制阀是实现生产过程自动化的“手脚”，安装在生产现场，时刻与介质接触，用于调节流量。常用到的控制阀和执行机构有那些呢？今天就给大家介绍在生产现场常用到的几种执行机构和一些控制阀的原理及适用场合。
The control valve is the "hands and feet" to realize the automation of production process. It is installed on the production site, always in contact with the medium, and is used to adjust the flow. What are the commonly used control valves and actuators? Today, we will introduce the principle and application of several actuators and control valves commonly used in the production site.
1. 薄膜执行机构
1. Membrane actuator
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2.带阀门定位器的活塞式执行机构
2. Piston actuator with valve positioner
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3.碟阀
3. Butterfly valve
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蝶阀的阀瓣是圆盘, 围绕阀座内的一个轴旋转, 旋角的大小, 便是阀门的开闭度。
The disc of butterfly valve is a disc, which revolves around an axis in the valve seat. The size of rotation angle is the opening and closing degree of the valve.
优点：轻巧、 结构简单、比其他阀门要节省材料、开闭迅速，切断和节流都能用, 流体阻力小, 操作省力，可以做成很大口径。
Advantages: light, simple structure, material saving compared with other valves, quick opening and closing, cutting and throttling can be used, small fluid resistance, labor-saving operation, can be made into a large diameter.
应用： 蝶阀在热水管路得到广泛的使用。能够使用蝶阀的地方, 最好不要使用闸阀, 因为蝶阀比闸阀经济, 而且调节性好。
Application: butterfly valve is widely used in hot water pipeline. Where butterfly valves can be used, it is better not to use gate valves, because butterfly valves are more economical than gate valves and have good adjustability.