【正文】 實(shí)現(xiàn)閥門(mén)程控、自控和遙控不可缺少的設(shè)備，其主要用在閉路閥門(mén)上。 5．輸出轉(zhuǎn)速：閥門(mén)的啟、閉速度快，易產(chǎn)生水擊現(xiàn)象。因此，電動(dòng)裝置空心輸出軸的內(nèi)徑必須大于明桿閥門(mén)的閥桿外徑。 3．輸出軸轉(zhuǎn)動(dòng)圈數(shù)：閥門(mén)電動(dòng)裝置輸出軸轉(zhuǎn)動(dòng)圈數(shù)的多少與閥門(mén)的公稱(chēng)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(dòng)裝置應(yīng)滿(mǎn)足的總轉(zhuǎn)動(dòng)圈數(shù)；H為閥門(mén)的開(kāi)啟高度，mm；S為閥桿傳動(dòng)螺紋的螺距，mm；Z為閥桿螺紋頭數(shù)?！?。因此掌握閥門(mén)電動(dòng)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)。該裝置由電力來(lái)驅(qū)動(dòng)，其運(yùn)動(dòng)過(guò)程可由行程、轉(zhuǎn)矩或軸向推力的大小來(lái)控制。)multiposition = attempting reengagement in several positions per revolutionfull disengagement = plete load separation, must be reengaged manuallyload holding The inserts are calibrated most precisely in order to ensure perfect mounting of the coupling. The otherwise usual, but high pretension of the inserts is thus reduced and the assembly is much easier. 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 increase. In addition, there is the risk of too much inner heating of the inserts because of increased flexing work.Made of special steel, even pletely sealedFor applications in the food area it is mostly required to oftect the coupling against aggressive cleaning detergents , liquid media, or dirt. Sealed couplings are also used in cleanroom technology and in very dusty applications. A plete sealing that is optionally offered by R+W avoids leaking grease and at the same time penetration of coupling damaging substances. This solution ofvides all the sealing elements integrated in one ponent. An Oring is inserted in the base element of the coupling and covered by an extended Actuation ring. This system makes sure that the external dimensions of the coupling stay the same.Areas of applications of the Torque Limiters ranging from to 2,800 Nm can be found in any type of mechanical dynamic drives are being continously improved by the use of preset Torque Limiters. When the overload occurs the Torque Limiters disengage in milli seconds. The movement of the Actuation ring can be sensed, and used to control and shut down the machine. Immediate availabillity of the machine after reengagement of the Torque Limiter can be assured.Increased economic efficiencyOptimized disc springs and materials adapted to the use of the coupling allow for the pact and reliable design, better performance and wer mass. Also a long service life and maintenance free operation are importtant consierations when selecting couplings.Smaller couplings bined with a higher torque density additionally result in a cost advantage due to smaller dimensioning.On average the size of the Torque Limiter has been reduced by approx. 1/3 pared to other available products. This results in a reduced separation of masses in case of a crash due to the reduced weight and a smaller technical diameter.When paring the facts, it is clear that R + W develops and delivers the most pact Torque Limiters available period.A great variety The advantage of ball detent design Torque Limiters is the separation of the drive and the driven elements in milliseconds in case of an overload. Easy handling reliability are further advantages.Machine designs with little installation space or difficult to access areas do however often require special solutions. The R+ W range facilitates the easy modification by means of a modular concept. The hub type that is appropriate for the application is selected and integrated for the ideal design.The pressfit principle that has been developed by R+W uses the axial spring force of the metal bellows to pretension a tapered male part into the corresponding counterpiece slightly axially. An axial pretensioning of the metal bellows of only millimeters assures the absolutely backlashfree torque transmission. The selfadjusting tapered segment guaranties a wear and maintenancefree operation. 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. 2. To judge the heat of the motor itself. These two methods, regardless of the kind production Summarize of motor thermal capacity must take into account the given time margin. If a single way that will make the heat capacity characteristics of the motor line is difficult. Therefore, overload should be selected according to the reasons for the action can be a reliable method bination of plex ways in order to achieve a prehensive overload protection. Rotork electric actuator motor, its embedded in the windings in the motor insulati