閥門執(zhí)行器介紹和類型（中英文）

什么是閥門執(zhí)行器 / What is valve actuator

閥門執(zhí)行器是用于打開和關閉閥門的機構。 手動操作的閥門需要有人在場，使用連接到閥桿上的直接或齒輪機構來調整它們。

首先，閥門執(zhí)行器是一種控制閥。 雖然這是一個簡單的概念，但它包含一個具有輸入、輸出和操作它的機制的盒子。

操作輕松

帶有固有的故障模式操作

供壓要求低

輕松適應各種條件

易于維護

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

閥門執(zhí)行器的種類 / The kinds of Valve Actuators

現(xiàn)有的多種不同的閥門執(zhí)行器，其中大多數(shù)屬于常見類別，并根據(jù)施加的力量和所需的運動類型進行分類：

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:

氣動和液壓執(zhí)行器（流體動力） —— 直角回轉 —— 它們以其多功能性而著稱，用于不易獲得電力的地方或可靠性和簡單性至關重要的應用。 它們具有許多功能，首先，它們是小型執(zhí)行器，可為大型的執(zhí)行器提供幾英寸磅的扭矩，并可供給數(shù)百萬英寸磅甚至更多的扭矩。 此外，它們有一個與某些機構耦合的氣缸，該機構可以切換線性運動并將其更改為閥門操作所需的直角轉動運動。 不僅如此，它們還有一個額外的反向彈簧，可在緊急情況下主動關閉。

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.

氣動和液壓執(zhí)行器（流體動力） —— 多回轉 —— 對于多回轉，它們有助于操作線性型、閥門式閘閥或截止閥。通常不會為此使用電動執(zhí)行器，但氣動和液壓執(zhí)行器是不易獲得電力的應用的可行選擇。

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.

電動執(zhí)行器 —— 多回轉 —— 它們是最常見的，而且?guī)缀蹼S處可見，它們也非常可靠。 它們能夠快速操作一些大型的閥門，可以借助單相或三相電動機為它們提供動力，而且是通過齒輪和正齒輪連接。 此外，它們還通過齒輪和正齒輪驅動閥桿螺母，并與閥桿接合以打開或關閉它。

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.

電動執(zhí)行器 —— 直角回轉 —— 其設計類似于多回轉電動執(zhí)行器； 主要區(qū)別在于最后一個元素被放置在一個象限中并提供 90 度的旋轉。 這種類型的執(zhí)行器非常緊湊，并且由于功率要求低，通常用于較小的閥門。

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.

手動執(zhí)行器 —— 手動閥門執(zhí)行器不需要外部電源即可將閥門移動到所需位置。 相反，它們使用的是手輪、鏈輪、杠桿或可分離機構，有助于驅動一系列齒輪，將其與輸入（手動）扭矩進行比較時，這些齒輪的比率會產(chǎn)生更高的輸出扭矩。 對于一些閥門，手動操作不是一個可行的選擇，這主要是因為應用包括遠程管道中的閥門或操作所需的絕對力。

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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