阀门执行器介绍和类型(中英文)
什么是阀门执行器 / What is valve actuator
阀门执行器是用于打开和关闭阀门的机构。 手动操作的阀门需要有人在场,使用连接到阀杆上的直接或齿轮机构来调整它们。
首先,阀门执行器是一种控制阀。 虽然这是一个简单的概念,但它包含一个具有输入、输出和操作它的机制的盒子。
操作轻松
带有固有的故障模式操作
供压要求低
轻松适应各种条件
易于维护
A valve actuator is the mechanism for opening and closing a valve. Manually operated valves need someone in attendance to adjust them using a direct or geared mechanism attached to the valve stem.
To begin with, valve actuators are a type of control valve. Though it is a simple concept, it comprises a box that has an input, output and a mechanism that operates it.
Not heavy on the pocket
Comes with an inherent failure-mode action
Low supply-pressure requirement
Easily adjust to varying conditions
Easily maintained
阀门执行器的种类 / The kinds of Valve Actuators
现有的多种不同的阀门执行器,其中大多数属于常见类别,并根据施加的力量和所需的运动类型进行分类:
Now let us talk about the different kinds of valve actuators that are present. Majority of them, fall into common categories and is categorised based on power applied and the kind of movement required:
气动和液压执行器(流体动力) —— 直角回转 —— 它们以其多功能性而著称,用于不易获得电力的地方或可靠性和简单性至关重要的应用。 它们具有许多功能,首先,它们是小型执行器,可为大型的执行器提供几英寸磅的扭矩,并可供给数百万英寸磅甚至更多的扭矩。 此外,它们有一个与某些机构耦合的气缸,该机构可以切换线性运动并将其更改为阀门操作所需的直角转动运动。 不仅如此,它们还有一个额外的反向弹簧,可在紧急情况下主动关闭。
Pneumatic and hydraulic actuators (fluid power) – quarter-turn —— They are known for their versatile nature and are used where electrical power is not easily available or in applications where reliability and simplicity are of crucial importance. They have many capabilities, to begin with, they are small actuators and deliver a few inch-pounds of torque to the largest one and can provide millions of inch-pounds of torque or even more. Furthermore, they have a cylinder that is coupled with some mechanism that switches the linear motion and changes it to quarter-turn motion that is necessary for valve operation. Not just that, but they also have an additional opposing spring that has positive shut-down in emergencies.
气动和液压执行器(流体动力) —— 多回转 —— 对于多回转,它们有助于操作线性型、阀门式闸阀或截止阀。通常不会为此使用电动执行器,但气动和液压执行器是不易获得电力的应用的可行选择。
Pneumatic and hydraulic actuators (fluid power) – multi-turn – Now coming to multi-turn, they help in operating a linear-type, valve-like gate valve, or a globe valve. People don’t usually use electric actuators for this purpose, but pneumatic and hydraulic actuators are a viable option for applications where electricity isn’t readily available.
电动执行器 —— 多回转 —— 它们是最常见的,而且几乎随处可见,它们也非常可靠。 它们能够快速操作一些大型的阀门,可以借助单相或三相电动机为它们提供动力,而且是通过齿轮和正齿轮连接。 此外,它们还通过齿轮和正齿轮驱动阀杆螺母,并与阀杆接合以打开或关闭它。
Electric actuators – multi-turn – They are the most common, and you will see them mostly everywhere, they are also very dependable. They are capable of swiftly operating some of the largest valves and you can power them with the help of a single or three-phase electric motor and are an amalgamation of gears and spurs. Moreover, they also gear, and spur drive a stem nut, and engage the stem of the valve to open or close it.
电动执行器 —— 直角回转 —— 其设计类似于多回转电动执行器; 主要区别在于最后一个元素被放置在一个象限中并提供 90 度的旋转。 这种类型的执行器非常紧凑,并且由于功率要求低,通常用于较小的阀门。
Electric actuators – quarter-turn – Its design is similar to the multi-turn electric actuator; the primary difference is that the final element is placed in one quadrant and offers 90 degrees of rotation. In a type like this, they are very compact and often used in smaller valves, because of low power requirements.
手动执行器 —— 手动阀门执行器不需要外部电源即可将阀门移动到所需位置。 相反,它们使用的是手轮、链轮、杠杆或可分离机构,有助于驱动一系列齿轮,将其与输入(手动)扭矩进行比较时,这些齿轮的比率会产生更高的输出扭矩。 对于一些阀门,手动操作不是一个可行的选择,这主要是因为应用包括远程管道中的阀门或操作所需的绝对力。
Manual actuators – In Manual valve actuator, you do not need an outside power source in order to move a valve to the desired position. Instead, what they use is a handwheel, chainwheel, lever, or declutchable mechanism that helps to drive a series of gears whose ratio results in a higher output torque when you compare it to the input (manual) torque. For several valves, manual operation is not a viable option, that is majorly because the application consists of valves in remote pipelines or the sheer force required for operation.
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