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(guān)閉閥門的機(jī)構(gòu)。 手動(dòng)操作的閥門需要有人在場(chǎng)，使用連接到閥桿上的直接或齒輪機(jī)構(gòu)來(lái)調(diào)整它們。
首先，閥門執(zhí)行器是一種控制閥。 雖然這是一個(gè)簡(jiǎn)單的概念，但它包含一個(gè)具有輸入、輸出和操作它的機(jī)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(yīng)各種條件
易于維護(hù)
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(jiàn)類別，并根據(jù)施加的力量和所需的運(yùn)動(dòng)類型進(jìn)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(dòng)和液壓執(zhí)行器（流體動(dòng)力） —— 直角回轉(zhuǎn) —— 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(jiǎn)單性至關(guān)重要的應(yīng)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(wàn)英寸磅甚至更多的扭矩。 此外，它們有一個(gè)與某些機(jī)構(gòu)耦合的氣缸，該機(jī)構(gòu)可以切換線性運(yùn)動(dòng)并將其更改為閥門操作所需的直角轉(zhuǎn)動(dòng)運(yùn)動(dòng)。 不僅如此，它們還有一個(gè)額外的反向彈簧，可在緊急情況下主動(dòng)關(guān)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(dòng)和液壓執(zhí)行器（流體動(dòng)力） —— 多回轉(zhuǎn) —— 對(duì)于多回轉(zhuǎn)，它們有助于操作線性型、閥門式閘閥或截止閥。通常不會(huì)為此使用電動(dòng)執(zhí)行器，但氣動(dòng)和液壓執(zhí)行器是不易獲得電力的應(yīng)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(dòng)執(zhí)行器 —— 多回轉(zhuǎn) —— 它們是最常見(jiàn)的，而且?guī)缀蹼S處可見(jiàn)，它們也非?？煽俊?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(dòng)機(jī)為它們提供動(dòng)力，而且是通過(guò)齒輪和正齒輪連接。 此外，它們還通過(guò)齒輪和正齒輪驅(qū)動(dòng)閥桿螺母，并與閥桿接合以打開或關(guān)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(dòng)執(zhí)行器 —— 直角回轉(zhuǎn) —— 其設(shè)計(jì)類似于多回轉(zhuǎn)電動(dòng)執(zhí)行器； 主要區(qū)別在于最后一個(gè)元素被放置在一個(gè)象限中并提供 90 度的旋轉(zhuǎn)。 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(dòng)執(zhí)行器 —— 手動(dòng)閥門執(zhí)行器不需要外部電源即可將閥門移動(dòng)到所需位置。 相反，它們使用的是手輪、鏈輪、杠桿或可分離機(jī)構(gòu)，有助于驅(qū)動(dòng)一系列齒輪，將其與輸入（手動(dòng)）扭矩進(jìn)行比較時(shí)，這些齒輪的比率會(huì)產(chǎn)生更高的輸出扭矩。 對(duì)于一些閥門，手動(dòng)操作不是一個(gè)可行的選擇，這主要是因?yàn)閼?yīng)用包括遠(yuǎn)程管道中的閥門或操作所需的絕對(duì)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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