原文：
为了成功的实现过程自动化，最重要的是要确保阀门自身能够满足过程及管道内介质的特殊要求。通常生产过程和工艺介质能够决定阀门的种类，阀芯的类型以及阀内件和阀门的结构和材料。 阀门选择好后接下来就要考虑自动化的要求即执行机构的选择。可以简单的按两种基本的阀门操作类型来考虑执行机构。 1.旋转式阀门（单回转阀门） 这类阀门包括：旋塞阀、球阀、蝶阀以及风门或挡板。这类阀门需要已要求的力矩进行90度旋转操作的执行机构 2.多回转阀门 这类阀门可以是非旋转提升式阀杆或旋转非提升式杆，或者说是他们需要多转操作去驱动阀门到开或关的位置。这类阀门包括：直通阀（截止阀）、闸阀、刀闸阀等。作为一种选择，直线输出的气动或液动气缸或薄膜执行机构也开来驱动上述阀门。 目前共有四种类型的执行机构，它们能够使用不同的驱动能源，能够操作各种类型的阀门。 1.电动多回转式执行机构 电力驱动的多回转式执行机构是最常用、最可靠的执行机构类型之一。使用单相或三相电动机驱动齿轮或蜗轮蜗杆{zh1}驱动阀杆螺母，阀杆螺母使阀杆产生运动使阀门打开或关闭。 多回转式电动执行机构可以快速驱动大尺寸阀门。为了保护阀门不受损坏，安装在在阀门行程的终点的限位开关会切断电机电源，同时当安全力矩被超过时，力矩感应装置也会切断电机电源，位置开关用于指示阀门的开关状态，安装离合器装置的手轮机构可在电源故障时手动操作阀门。 这种类型执行机构的主要优点是所有部件都安装在一个壳体内，在这个防水、防尘、防爆的外壳内集成了所有基本及先进的功能。主要缺点是，当电源故障时，阀门只能保持在原位，只有使用备用电源系统，阀门才能实现故障安全位置（故障开或故障关） 2.电动单回转式执行机构 这种执行机构类似于电动多回转执行机构， 主要差别是执行机构最终输出的是1/4转记90度的运动。新一代电动单回转式执行机构结合了大部分多回转执行机构的复杂功能，例如：使用非进入式用户友好的操作界面实现参数设定与诊断功能。 单回转执行机构结构紧凑可以安装到小尺寸阀门上，通常 输出力矩可达800公斤米，另外应为所需电源较小，它们可以安装电池来实现故障安全操作。 3.流体驱动多回转式或直线输出执行机构 这种类型执行机构经常用于操作直通阀（截止阀）和闸阀，它们使用气动或液动操作方式。结构简单，工作可靠，很容易实现故障安全操作模式。 通常情况下人们使用电动多回转执行机构来驱动闸阀和截止阀，只有在无电源时才考虑使用液动或气动执行机构。 4.流体驱动单回转式执行机构 气动、液动单回转执行机构非常通用，它们不需要电源并且结构简单，性能可靠。它们应用的领域非常广泛。通常输出从几公斤米到几万公斤米。它们使用气缸及传动装置将直线运动转换为直角输出，传动装置通常有：拨叉、齿轮齿条，杠杆。齿轮齿条在全行程范围内输出相同力矩，它们非常适用于小尺寸阀门，拨叉具有较高效率在行程起点具有高力矩输出非常适合于大口径阀门。气动执行机构一般安装电磁阀、定位器或位置开关等附件来实现对阀门的控制和监测。 这种类型执行机构很容易实现故障安全操作模式。

“ Valve on the pipeline process automation safeguarding the special requirements of medium ”是由提供的阀门行业新闻，译文仅供参考。另外，中国气动阀门网还提供相关产品搜索： 、 、 、 、 、 等。

译文：
In order to achieve a successful process automation, the most important thing is to ensure that the valve itself to meet the process and the special requirements of medium inside the tubes. Media production process and the process is usually to determine the types of valves, valve type and valve parts and valve structures and materials. Valve selected the options to be considered next automation that is the choice of implementing agencies. Can simply operate according to two basic types of valves considered in implementing agencies. 1. Rotary valve (single-turn valves) Such valves include: plug, ball valves, butterfly valves and dampers, or baffle. Such valves have been required torque needed to rotate 90 degrees to the implementation of agency operations 2. Multi-turn valves Such valves can be elevated non-rotating valve stem or rotary non-elevated bar, or they need more action to drive the valve to turn on or off position. Such valves include: straight-through valve (valve), valve, knife gate valve and so on. As an alternative, linear output pneumatic or hydraulic cylinder or film the implementation agencies to drive the valve open. There are currently four types of implementing agencies, they can use different drivers of energy, to operate various types of valves. 1. More rotary electric actuator More power-driven rotary actuator is the most common and most reliable type of one of the implementing agencies. Use single or three phase motor drive worm gear final drive gear or the stem nut, stem nut to produce movement of the valve stem to open or close. Multi-turn electric actuator can quickly drive large valves. To protect the valve from damage, installed at the end of the trip valve limit switch will cut off electrical power, and moment when the security is exceeded, the torque sensor device will cut off electrical power, position switch used to indicate the valve switch state, the clutch device installed on the hand wheel mechanism can be manually operated valve when the power failure. This type of executive body of the main advantages is that all components are installed inside a shell, in this waterproof, dust proof enclosure integrates all basic and advanced features. The main disadvantage is that when the power failure, the valve can remain in place, only use the standby power system to achieve fail-safe valve position (open or failure fault off) 2. Electric single rotary actuator This multi-turn electric actuator similar to the implementing agencies, the main difference is the executive body the final output is 1 / 4 turn 90 degrees of movement in mind. A new generation of rotary electric actuator combined single most complex multi-turn actuator functions, such as: use of non-access-based user-friendly interface to achieve parameter settings and diagnostics. Single compact rotary actuator can be installed to the small size of the valve, usually the output torque up to 800 kilograms of rice, another should be required to supply small, they can install the battery to achieve fail-safe operation. 3. Fluid-driven rotary or linear output over the implementing agencies Implementing agency of this type often used to operate through valve (valve) and the gate, they use pneumatic or hydraulic operated. Simple, reliable, easy to implement fail-safe mode of operation. Usually people use power to drive multi-turn valve actuator and valve, no power only when to consider using hydraulic or pneumatic actuator. 4. Fluid-driven single-rotary actuator Pneumatic, hydraulic actuator is very common single-turn, they do not require power and a simple structure, reliable performance. Their broad range of applications. Usually the output from a few kilograms of rice to the tens of thousands of kilograms of rice. Cylinder and the gear they use to output linear motion is converted to right angle, usually gear: Shift fork, rack and pinion, lever. Rack and Pinion full travel range of the output in the same moment, they are very suitable for small-size valves, fork in the journey from high efficiency with high torque output is suitable for large diameter valves. Pneumatic actuator solenoid valve normally installed, location, or position switches and other accessories to achieve the valve control and monitoring. Implementing agency of this type are easy to implement fail-safe mode of operation.