Valve electric device is an indispensable equipment
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Release Time：2018-03-23
Valve electric device is to achieve the valve is now controlled, automatic control and remote control indispensable equipment, the movement process can be controlled by the size of the stroke, torque or axial thrust. Since the working characteristics and utilization of the valve electric device depends on the type of valve, the device work specification and the position of the valve in the pipeline or equipment, the correct selection of the valve electric device is essential to prevent overload phenomenon (working torque is higher than the control torque). Valve electric device of its special requirements, that must be able to limit the torque or axial force. Usually the valve electric device uses a torque-limiting coupling. When the specification of the electric device is determined, its control torque
Valve electric device is to achieve the valve is now controlled, automatic control and remote control indispensable equipment, the movement process can be controlled by the size of the stroke, torque or axial thrust. Since the working characteristics and utilization of the valve electric device depends on the type of valve, the device work specification and the position of the valve in the pipeline or equipment, the correct selection of the valve electric device is essential to prevent overload phenomenon (working torque is higher than the control torque).
Valve electric device of its special requirements, that must be able to limit the torque or axial force. Usually the valve electric device uses a torque-limiting coupling. When the specifications of the electric device are determined, its control torque is also determined. Generally, the motor will not be overloaded when it runs for a predetermined period of time. However, the following situations may lead to overload: first, the power supply voltage is low, the required torque is not available, so that the motor stops rotating; The second is to set the torque limiting mechanism incorrectly to make it greater than the stopping torque, resulting in continuous excessive torque, so that the motor stops rotating; The third is intermittent use, which generates heat accumulation and exceeds the allowable temperature appreciation of the motor; four is due to some reason the torque limiting mechanism circuit failure, so that the torque is too large; five is the use of ambient temperature is too high, the relative heat capacity of the motor decreased.
In the past, the way to protect the motor is to use fuses, overcurrent relays, thermal relays, thermostats, etc., but these methods have their own advantages and disadvantages. There is no absolutely reliable protection method for load-changing equipment such as electric devices. Therefore, it is necessary to adopt various combinations, which can be summed up in two ways: one is to judge the increase or decrease of the input current of the motor; the other is to judge the heating of the motor itself. These two methods, no matter which, should consider the time margin given by the motor heat capacity.
Usually, the basic protection method of overload is: the continuous operation of the motor or inching operation of overload protection, the use of thermostat; the protection of motor stall, the use of thermal relay; short-circuit accident, the use of fuse or overcurrent relay.
If the opening and closing speed of the output speed valve is too fast, it is easy to produce water hammer. Therefore, the appropriate opening and closing speed should be selected according to different conditions of use.
Valve electric device has its special requirements, that must be able to limit the torque or axial force. Usually the valve electric device uses a torque-limiting coupling. When the specifications of the electric device are determined, its control torque is also determined. Generally, the motor will not be overloaded when it runs for a predetermined period of time. However, the following situations may lead to overload: first, the power supply voltage is low, the required torque is not available, so that the motor stops rotating; The second is to set the torque limiting mechanism incorrectly to make it greater than the stopping torque, resulting in continuous excessive torque, so that the motor stops rotating; The third is intermittent use, which generates heat accumulation and exceeds the allowable temperature appreciation of the motor; four is due to some reason the torque limiting mechanism circuit failure, so that the torque is too large; five is the use of ambient temperature is too high, the relative heat capacity of the motor decreased.
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