原文：
            由于电动阀门是由阀门和电动装置组合而成，所以当阀门确定后如何正确选择电动装置是关系到实际使用中是否能够满足工程需要的重要因素。在选择电动装置时不但应考虑前述的工作环境、电气控制和一般技术性能，而且对电动装置的综合技术性能亦应进行全面的考虑。

      1、电动装置的输出转矩与转速 输出转矩值是电动装置的重要技术参数之一，针型阀也是使用中需要选择的重要参数。如果在组配电动阀门时选用的电动装置输出转矩过大或不足都是不可取的。因为一般情况，电动装置生产厂在产品出厂时均需进行输出转矩值的测试与调整，是相对比较准确的。如果选用过大的输出转矩余量，将会使电动阀门具有很大的潜在危险性，一旦发生控制保护失灵情况将很容易造成阀门损坏（阀杆弯曲、阀体破裂）现象，极易造成管道系统事故。所以输出转矩余量选择过大是不可取的。呼吸阀如果在实际工作中打不开阀门也是属于选择不合理。 关于对电动装置输出转速的确定，在阀门对其启闭时间没有严格要求时，应尽量选用较慢的速度。 因为不必要的较快速度，在相同转矩要求下将会增大电机功率，调节阀这样不但浪费能源，提高工程造价，而且也会使电动装置体积增大造成多方面浪费。 目前国内自行开发研制的电动装置，在每个机座号中设计配用的电动机规格数量不多（一般为2-3个规格），以及主体传动中齿轮副和蜗轮副的速比范围变化有限，所以每个机座号的转矩分档和转速分档都不多。

       2、电动装置的最大推力允许值 如果阀门轴向力由电动装置承担（即阀杆螺母在电动装置中），减压阀其推力值不允许超过电动装置的允许值。

       3、阀杆螺母的最大转圈数 在选用多回转阀门电动装置时必须说明阀门工作时阀杆螺母的最大转圈数，这样可以正确选配电动装置中位置指示机构的有关齿轮速比，以使位置指示有足够的精度满足阀门工作过程中对阀门开、关程度的观察，否则易造成错觉，影响正常工作。

       4、阀杆直径的允许值 升降杆阀门选择电动装置应注意其允许通过的阀杆直径值，锻钢阀门阀杆直径必须小于该值。另外，对于多回转电动装置，在选用时还应提出对阀杆罩高度的要求（与阀门痛径有关）。旋转杆阀门可不配带阀杆罩。

      5、阀门与电动装置的连接 阀门与电动装置的连接型式与尺寸应符合国家标准：GB/T12222-1989多回转阀门驱动装置的连接，GB/T12223-1989部分回转阀门驱动装置的连接。 目前，部分回转阀门电动装置均有机械限位，以防止无法判断阀瓣位置，这类阀门与电动装置间的连接螺孔和键槽位置的对应关系要求严格。

“ Analysis of valve electric device selection method ”是由中国针型阀网提供的国际阀门新闻，译文仅供参考。另外，中国针型阀网还提供相关产品搜索： 角式针型阀、 仪表阀组、 仪表球阀(气动管路球阀)、 仪表截止阀(气动管路截止阀)、 更多针型阀产品等。

译文：
           As the electric valve is a combination of valves and electrical equipment, so when the valve to determine how the correct choice after the electric device is related to the actual use of the ability to meet the engineering needs of the important factors. Electrical device in the choice of the above should be considered not only the work environment, electrical control and general technical performance, and comprehensive technology on the performance of electric devices should also be considered comprehensive. 1, electrical device output torque and speed Output torque value is the important technical parameters of electrical devices, is also in use need to select the important parameters. If the group when equipped with optional electric valve electric actuator output torque is too large or less are desirable. BecauseCheck Valves the general situation, the electric equipment manufacturing plant in the products the factory torque values required for testing and adjustment is relatively accurate. If you use too much torque margin, will make electric valve of great potential risk, control and protection in the event the situation would be likely to result in failure of the valve damage (stem bending, body breakdown) phenomenon, a very pipeline system caused the accident prone. So, choose the output torque marginBellows Seal Valves is too large is not desirable. If the actual work are unable to open the valve is unreasonable choice. Output speed of electric installations on the determination of its opening and closing the valve when the time is not strictly required, should try to use a slower speed. More rapid pace because of the unnecessary, in the same request will increase torque motor power, it will not only waste energy, increase the project cost, but also will result in many electric devices increased waste volume. Self-developed domestic electric devices, in each frame size motors used in the design specifications with a small number (typically 2-3 standard), and the main transmission in the worm gear pair and the change in speed ratio range is limited Therefore, the torque per frame size sub-sub-file and the file is not more speed. 2, the electric device to allow thePlug Valves value of the maximum thrust If the valve axial force borne by the electrical device (ie, stem nut in electrical devices), the thrust value must not exceed the allowable value for electrical installations. 3, the maximum revolutions stem nut In the selection of multi-turn electric valve actuators have to say when the valve stem nut job most revolutions, this Butterfly Valvesdevice can be correctly matching electric position indicator to the relevant gear ratio, so that there is sufficient precision position indicator valve to meet course of their work on the valve gate opening and closing levels of observation, otherwise easily lead to delusion, affecting the normal work. 4, to allow the value of stem diameter Lifter Valve selection should pay attention to the electric device allows the valve stem diameter values, stem diameter must be less than the value. In addition, for multi-turn electric devices Safety Valves should also be made in the selection of high demands on the valve stem cover (with the valve diameter related pain). Rotating rod may not fit with the valve stem cover. 5, valves and electrical equipment connected Valves and electrical equipment connected type and size should be consistent with national standards: GB/T12222-1989 multi-turn valve actuator attachment, GB/T12223-1989 part of the rotary valve actuator connection. Currently, some turn electric valve actuators have a mechanical limit to prevent the flap valve can not determine the location of these valves and electrical connections between devices screw and keyway strict correspondence between locations.

原文来源：
http://www.1zhenxingfa.com/

2010-08-30 06:41

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