electric actuator is the realization of the valve control, automatic control and remote control of the indispensable equipment, its movement process can by travel, torque, or to control the size of the axial thrust. Due to the working characteristic of valve electric device and work efficiency depends on the type of valve, the device specification and the position of the valve in the pipeline or equipment, therefore, the correct selection of valve electric device, to prevent overload phenomenon, Work torque is higher than the control torque) Is of crucial importance. Its special requirements

valve electric actuator, which must be able to limit torque and axial force. electric device adopts usually limiting torque shafts. When the electric actuator specifications was determined, the control torque is determined. Generally run in a predetermined time, the motor will not overload. But as the following conditions may lead to overload: one is the low voltage power supply and can not get the required torque, the motor stop running; 2 it is wrong to set torque limit, make its torque is greater than the stop, cause continuously produce too large torque, the motor stop running; 3 it is intermittent use, the heat generated by the savings, more than the allowed temperature of the motor to appreciate; Four is a torque limit institutions circuit for some reason fails, the torque is too large; Five is the use of the environment temperature is too high, the relatively decreased motor heat capacity.

in the past for motor protection method is to use a fuse, overcurrent relay, thermal relay, thermostat, etc. , but these methods all have advantages and disadvantages. For this kind of variable load equipment, electric device is not absolutely reliable measures for the protection of. So we must take various combinations, induces has two kinds: one is the increase or decrease of the motor input current judgment; The second is the motor itself heating situations. These two approaches, both the heat capacity of the given time allowance to consider motor.

usually, on the basis of the overload protection method is: the continuous operation of motor or inching operation over load protection, using a thermostat; The protection of motor blocked, the thermal relay; For short circuit accident, adopt the fuse or over-current relay.

if the output speed of the valve opening and closing speed too fast, easy to produce water hammer. Therefore, should be used according to different conditions, choosing the proper opening and closing speed.

valve electric device has its own special requirements, which must be able to limit torque and axial force. electric device adopts usually limiting torque shafts. When the electric actuator specifications was determined, the control torque is determined. Generally run in a predetermined time, the motor will not overload. But as the following conditions may lead to overload: one is the low voltage power supply and can not get the required torque, the motor stop running; 2 it is wrong to set torque limit, make its torque is greater than the stop, cause continuously produce too large torque, the motor stop running; 3 it is intermittent use, the heat generated by the savings, more than the allowed temperature of the motor to appreciate; Four is a torque limit institutions circuit for some reason fails, the torque is too large; Five is the use of the environment temperature is too high, the relatively decreased motor heat capacity.

keywords: valve electric actuator, the valve electric actuator is the realization of the Industrial Valves control, automatic control and remote control of the indispensable equipment
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