Moment is larger than normal valve action of electric valve, electric valve switching speed can be adjusted, simple structure, easy maintenance, action for buffer characteristics of the gas itself in the process, not easy to damage due to get stuck, but must have a gas source, and its control system is more complicated than the electric valve. This valve shall generally be installed in the pipeline. Electric valve device is programmed, control valve 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 electric valve device depends on the type of Industrial Valves, and utilization device working rules and the position of the valve in the pipeline or equipment, therefore, the correct selection of electric valve device, to prevent overload phenomenon, Work torque is higher than the control torque) Is of crucial importance. In general, the basis of correct selection of electric valve device is as follows: operating torque operating torque is the most important parameters, choose the device of electric valve electric actuator output torque should be Industrial Valves operation maximum moment of 1. 2 to 1. 5 times. Operating thrust host structure of the electric valve device has two kinds: one kind is not configured thrust plate, direct output torque; The other is a configuration thrust plate, the output torque by thrust plate stem nut into output thrust. Output shaft turning laps electric valve device output shaft circle the number of how many and nominal diameter of the valve, the valve stem thread pitch, thread, according to M = H/ZS computing ( M for electric devices should satisfy the total number of rotating ring, H is height of valve opens, S for stem drive screw pitch, Z for the stem thread) 。 Stem diameter for multi-turn rising stem valves, if electric device allows the largest stem diameter can't through the stem of the valve, cannot assemble into electric valve. As a result, the inner diameter of the hollow output shaft electric actuator must be greater than rising stem valves stem diameter. In parts of rotary Industrial Valves and multi-turn valves non-rising stem valves, although need not consider stem diameter through the problem, but also should fully consider when selecting the valve stem diameter and the size of the keyway, after assembly to work properly. 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. Electric valve device has its own special requirements that must be able to limit torque and axial force. Electric valve 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: 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. Related: daily maintenance of electric valve, electric valve 1 should save dry indoor ventilation, path ends must be blocked. 2, long-term storage of electric valve should be checked regularly, remove dirt, and rust-proof oil coating on the surface of the processing. 3, after installation, should check regularly, main: (check project 1) Sealing surface wear. ( 2) The stem and stem nut abrasion of trapezoidal thread. ( 3) Packing is outdated failure, if any, should be replaced in a timely manner. ( 4) After repair of electric valve assembly, should carry on the sealing performance test.
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