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1、Torque overload protectionValve electric device is used to operate the valve and was one of the valves connected to the device. The device is driven by electricity, their motion process can be stroke, torque, or to control the size of the axial thrust. As the valve should be the work of electrical d
2、evice characteristics and utilization depend on the type of valves, fittings and valves regulate the work of the pipeline or equipment location. Therefore, control valve electric device the right choice; consider the prevention of overload (working torque higher than the control torque) has become e
3、ssential 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 1.2 1.5 times. 2. Operatio
4、n 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 con
5、verted 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 computing (where: M for the electrical installations should be to
6、 meet the total number of rotating ring; H of the valve opening height, mm; S to stem transmission thread pitch, mm; Z to stem the number of screw heads.) 4. Stem Diameter: For multi-turn type valves for the next shot, if the electric actuator allows the maximum stem diameter of the valve stem can n
7、ot be dispensed, it can not be assembled into electric valve. Therefore, the electrical device hollow output shaft diameter must be greater than specified under the valve stem diameter. For some rotary valves, as well as multi-turn valves in the dark bar valve, although without considering the adopt
8、ion 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 a
9、nd closing speed. 6. The installation, connection method: electric equipment installation for vertical installation, the level of the installation, floor installation; connections as follows: Are thrust plate; stem through (Ming pole multi-turn valves); dark bar multi-turn; without thrust disk; stem
10、 is not passed; part of the rotation Electric device is widely used, is to achieveproduction program-controlled valves, automatic control and remote control can not be a lack of equipment, its main use in the closed valve. But we can not ignore the special requirements of valve electric device - mus
11、t be able to limit the torque or axial force. Valve Electric installations are usually limited torque Couplings. When the electrical device specification is determined, the control torque is also determined. While in a pre-determined period of time to run when the motor normally does not overload.Ho
12、wever, if the following conditions so that it can be overloaded: 1. Power supply voltage is low, are not required torque, the motor stops rotating. 2. Mistakenly set the torque limit adjustment agencies, so that it is greater than stop torque, generated too large a result of continuous torque, the m
13、otor stops rotating. 3. Such as the point of action as intermittent use of heat generated savings of up, more than the allowable temperature rise of the motor. 4. Torque limit for some reason, institutional circuit failure, so that torque is too large. 5. Use of environmental temperature is too high
14、, relative to the heat capacity of the motor down. The above is the excessive number of reasons, for these reasons should be generated by motor overheating in advance, taking into account, and to take measures to prevent overheating. In the past to protect the motor way is to use fuses, overcurrent
15、relays, thermal relays, thermostats, etc., but these approaches also have their pros and cons of this change for the electrical device load devices, is absolutely reliable protection method is not. Must therefore take all methods combined approach. However, as the load on each electrical device is d
16、ifferent, it is difficult to propose a unified approach. In most cases, but generally, you can also find common ground. Overload protection taken by the way, be grouped into two types: 1. Changes in input current to the motor to judge; 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
