Process Description of Dissolved Air Flotation
May 15,2023Read More
Electric butterfly values are composed of butterfly values and electric devices. Therefore, after the butterfly value is determined, it is important to correctly choose the electric device to meet the need for the operation of engineering. The working environment, electrical control and general technical performance should be considered when choosing an electric device. In addition, the comprehensive technical performance of the electric device should also be considered.
When selecting electric devices for lifting rod valves, it is necessary to pay attention to the allowable stem diameter value, which must be less than the value. In addition, for the multi-turn electric device, the requirements for the height of the valve should be put forward for the selection of electric butterfly valves. Rotary rod valves can be equipped without stem cover.
The connection form and size of the valve and the electric device should meet the national standard, such as the connection of the GB/T1222-1989 multi-turn valve drive device and the connection of the CB/T12223-1989 part-turn valve drive device.
The output torque value is one of the important technical parameters of the electric device, and it is also an important parameter in selection. When assembling electric butterfly valves, it is not desirable if the output torque of the electric device selected is too large or insufficient. In general, electric device manufacturers need to test and adjust the output torque value when the product leaves the factory, which is relatively accurate. If the output torque margin is too large, the electric valve will have great potential danger. Once the failure of control and protection occurs, it is easy to cause valve damage and pipeline system accidents. Therefore, it is not advisable to select the output torque with a large margin. In addition, it is an unreasonable choice if the valve cannot be opened in the operation.
If the valve axial force is carried by the electric device (i.e. the stem nut is in the electric device), the thrust value must not exceed the allowable value of the electric device.
When selecting a multi-turn valve electric device, the maximum number of turns of the stem nut during operation must be stated. In this way, the relevant gear ratio of the position indicating mechanism in the electric device can be correctly selected to make the position indication has sufficient accuracy to meet the observation of the valve opening and closing degree during the operation of electric butterfly valves. Otherwise, it is easy to cause illusions and affect normal operation.
Currently, the part-turn electric butterfly valve device has mechanical limits to prevent the disc position cannot be determined. The corresponding relationship between the connection screw hole and the keyway position between the valve and the electric device is strictly required.
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