【正文】 ter than specified under the valve stem diameter. For some rotary valves, as well as multiturn valves in the dark bar valve, although without considering the adoption of stem diameter, but should also take full account of the matching stem diameter and keyway size, so that work can be assembled . 5. Output Speed: valve Kai, closed fast, easy to produce water hammer phenomenon. Should therefore be under different conditions of use, choose the appropriate Kai and closing speed. 6. The installation, connection method: electric equipment installation for vertical installation, the level of the installation, floor installation。 consider the prevention of overload (working torque higher than the control torque) has bee essential to the occurrence of a ring. Valve electric device right choice should be based on: 1. Operation torque: Operation torque is to select the main valve electrical device parameters. The output torque electric actuator valve operation should be the greatest moment of ~ times. 2. Operation Thrust: the host structure ofMOTORIZED VALVE ACTUATOR the valve electric device, there are two, one is not configured thrust plate, this time directly to the output torque。 the other is equipped with thrust plate, and this time the output torque of the valve stem through the thrust disk nut is converted to the output thrust. 3. Number of output shaft rotation circle: valve electric actuator output shaft rotation the number of laps and the valve nominal diameter, stem pitch, thread the first few related, according to M = H / ZS puting (where: M for the electrical installations should be to meet the total number of rotating ring。 connections as follows: Are thrust plate。 stem is not passed。 backlashfree, short reaction times and long service life have been further optimized. The constructive benefit is ensured through fast availability of applications after a crash.)multiposition = attempting reengagement in several positions per revolutionfull disengagement = plete load separation, must be reengaged manuallyload holding因此掌握閥門電動裝置正確的選擇；考慮防止超負(fù)荷（工作轉(zhuǎn)矩高于控制轉(zhuǎn)矩）的發(fā)生就成為至關(guān)重要的一環(huán)。 3．輸出軸轉(zhuǎn)動圈數(shù)：閥門電動裝置輸出軸轉(zhuǎn)動圈數(shù)的多少與閥門的公稱通徑、閥桿螺距、螺紋頭數(shù)有關(guān)，按M=H/ZS計(jì)算（式中：M為電動裝置應(yīng)滿足的總轉(zhuǎn)動圈數(shù)；H為閥門的開啟高度，mm；S為閥桿傳動螺紋的螺距，mm；Z為閥桿螺紋頭數(shù)。 5．輸出轉(zhuǎn)速：閥門的啟、閉速度快，易產(chǎn)生水擊現(xiàn)象。通常閥門電動裝置采用限制轉(zhuǎn)矩的連軸器。 2．錯誤地調(diào)定了轉(zhuǎn)矩限制機(jī)構(gòu)，使其大于停止的轉(zhuǎn)矩，而造成連續(xù)產(chǎn)生過大的轉(zhuǎn)矩，使電機(jī)停止轉(zhuǎn)動。 以上是出現(xiàn)超負(fù)荷的一些原因，對于這些原因產(chǎn)生的電機(jī)過熱現(xiàn)象應(yīng)預(yù)先考慮到，并采取措施，防止過熱。但概括多數(shù)情況，也可以從中找到共同點(diǎn)。所以應(yīng)選擇根據(jù)過負(fù)荷的原因能可靠的動作的方法——組合復(fù)合方式，以實(shí)現(xiàn)全面的過負(fù)荷保護(hù)作用。 閥門電動裝置的正確選擇和超負(fù)荷的防止是戚戚相關(guān)的，應(yīng)引起重視。 Important requirements such as being The transmittable torques can be accurate defined and ，可以準(zhǔn)確定義和設(shè)置。 When the overload occurs the Torque Limiters disengage in milli 。 Also a long service life and maintenance free operation are importtant consierations when selecting ，使用壽命長和免維護(hù)操作importtant consierations在選擇聯(lián)軸器。 This results in a reduced separation of masses in case of a crash due to the reduced weight and a smaller technical 。 很少安裝空間或難以進(jìn)入的地區(qū)做機(jī)械設(shè)計(jì)但是往往需要特殊的解決方案。 An axial pretensioning of the metal bellows of only millimeters assures the absolutely backlashfree torque 。 Between the safety element with clamping hub and the other coupling half, there is an elastomer insert made of thermoplastic polyurethane (TPU) absorbing the drive ，有一個熱塑性聚氨酯彈性體插入了（TPU）時吸收的驅(qū)動器的振動。 Poor manufactured couplings may cause pulsating radial forces onto the rotational axle during 。 If on the other hand the inserts are pressed in at too high pretension, the radial forces occurring with lateral misalignment on the shafts will ，插入被按下過高預(yù)緊中，發(fā)生了徑向力與橫向的軸偏差就會增加。 A plete sealing that is optionally offered by R+W avoids leaking grease and at the same time penetration of coupling damaging ，并在同一時間耦合的滲透破壞的物質(zhì)。 Costly solutions where the coupling was sealed with a housing are therefore unnecessary該系統(tǒng)可以確保該耦合的外形尺寸保持不變。功能專利?+寬prinziple R+W39。 R + W conceived a solution which stands out. ?+寬構(gòu)思一個解決方案。 An outstanding feature opf the R+W design is an easy radial adjustment which clearly facilitates adjustment of the + W設(shè)計(jì)是一件容易的徑向調(diào)整，明顯促進(jìn)了耦合調(diào)整。） multiposition = attempting reengagement in several positions per revolution 多工位 =試圖重新聘用，每革命的幾個位置 full disengagement = plete load separation, must be reengaged manually 全面完成脫離接觸 =載荷分離，必須重新進(jìn)行手動 load holding = no disengagement occurs but an external sensor can be instantly triggered 負(fù)載控股 =脫離接觸發(fā)生，但沒有一個外部傳感器可以立即觸發(fā) With these four function systems R+W offers a solution for every +寬為每個應(yīng)用提供了一個解決方案。7 / 7。 When using a Torque Limiter, which