How to select electric actuator of the electric regulating ...

The valve electric actuator is an important driving force of the electric regulating butterfly valve, and its selection determines the actual on-site operation of the product. At the same time, the selection of electric actuators has some own selection criteria. Mainly from the operating torque, host structure, output shaft rotation, output speed, etc. to consider, more detailed principles will be shared below:
1. The operating torque is an important parameter for selecting the valve electric device. The output torque of the electric actuator should be 1.2 to 1.5 times the larger operating torque of the valve.

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2. The main structure of the valve electric device is divided into two types: without thrust plate and with thrust plate. The main difference between the two is whether the torque is directly output or converted by the stem nut in the thrust plate.
3. The number of rotations of the output shaft is related to the nominal diameter of the valve, the pitch of the stem, and the number of thread heads. The total number of rotations that the electric device should meet = valve opening height/stem thread head number X valve Rod drive thread pitch.
4. The diameter of the optional valve stem must be allowed to pass by the electric device. That is to say, the inner diameter of the hollow output shaft of the electric device must be larger than the outer diameter of the stem of the rising stem valve. At the same time, in order to ensure that the electric regulating butterfly valve can work normally after assembly, the diameter of the valve stem and the size of the keyway need to be selected appropriately.
5. The output speed needs to be appropriate. If the opening and closing speed of the valve is too fast, water hammer is likely to occur. So choose according to the usage.
The above are the problems that need to be paid attention to in the selection of the electric valve electric actuator of the electric regulating butterfly valve. In terms of packaging and transportation, there are also some points to pay attention to regarding valve electrical equipment. First of all, the packaging of electrical equipment such as valve electric actuators should be protected from rain, moisture, and dust, and the packaging should be firm and reliable. After receiving the goods, they should be installed immediately. If it needs to be placed for a period of time, the storage environment should be kept ventilated and dry, and it should not be stored in the open air. At the same time, it is forbidden to carry out debugging and maintenance on cloudy and rainy days. After the pressure test is completed, re-tighten all the firmware to ensure that the electrical part is tightly sealed to prevent corrosion loss and affect later use.
The valve electric actuator of the electric regulating butterfly valve is an indispensable device for the realization of valve program control, automatic control and remote control. Its movement process is controlled by the stroke, torque or axial thrust. The correct selection of valve electric devices is essential to prevent overload. For more information about electric butterfly valves, please consult the online customer service of Tanghai Valve&#;s official platform. You are welcome to visit and purchase.

TH Valve is a professional manufacturer of butterfly valve, gate valve, check valve, globe valve, knife gate valve, ball valve with API, JIS, DIN standard, used in Oil, Gas, Marine industry, Water supply and drainage, fire fighting, shipbuilding, water treatment and other systems, with Nominal Diameter of DN50 to DN, NBR/EPDM/VITON, Certificates & Approvals: DNV-GL, Lloyds, DNV, BV, API, ABS, CCS. Standards: EN 593, API609, API6D

Related news/knowledge:

When choosing an electric actuator for a valve, operating torque, operating thrust, output shaft rotation, stem diameter, and output speed are all important factors to consider.

Operating torque: Operating torque is a measure of the amount of force needed to turn an electric actuator. he torque required to move the actuator from one position to another is known as the actuator torque, and it is usually measured in Newton meters (Nm) or pound-feet (lb-ft).The operating torque is an important consideration when selecting an electric actuator, as it must be able to generate enough torque to overcome the resistance of the load being moved. Factors such as the weight and friction of the load, as well as the speed and acceleration of the movement, will all affect the required operating torque.

Operating thrust: The operating thrust of an electric actuator refers to the amount of force that an electric actuator can generate in the direction of its movement. Operating thrust is an important consideration when selecting an electric actuator, as it must be able to generate enough force to overcome the resistance of the load being moved. Factors such as the weight and friction of the load, as well as the speed and acceleration of the movement, will all affect the required operating thrust.

In addition to the operating thrust, the actuator should also be able to maintain a holding thrust, this is the force required to hold a load in position without any additional power consumption.

In summary, operating thrust and torque are the two main factors that determine the performance of an electric actuator, and it is important to ensure that the actuator selected has adequate thrust and torque for the specific application it will be used for.

Output shaft rotation: The output shaft rotation of an electric actuator refers to the rotation of the shaft that is connected to the load or mechanism that the actuator is controlling. The movement of the load is directly proportional to the rotation of the output shaft. Depending on the specific application, the output shaft rotation may be continuous or limited to a certain angle.

The output shaft rotation is an important consideration when selecting an electric actuator, as it must be able to provide the required rotation for the specific application. For example, in a valve actuator, the output shaft rotation must be able to rotate the valve to the desired position. In a linear actuator, the output shaft rotation may be limited to a specific angle, such as 90 degrees. In other applications, like a robotic arm, the output shaft rotation can be continuous, allowing for full range of motion.

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The electric actuator's control system can often control the output shaft rotation by controlling the current or voltage supplied to the actuator's motor, which in turn rotates the output shaft. The actuator's control system also can provide feedback on the position, speed and torque of the output shaft.

So the output shaft rotation is an important consideration when selecting an electric actuator, as it directly relates to the movement of the load and it should be able to provide the required rotation for the specific application. Actuator's control system can control the rotation and provide feedback on the output shaft.

Stem diameter: The stem diameter of an electric actuator refers to the diameter of the steam pipe or tubing that is used to supply steam to the actuator. This is not a common feature in electric actuators, as electric actuators typically use electricity as their power source. Steam-powered actuators use steam as the energy source to produce mechanical motion through a piston or diaphragm.

The steam diameter is an important consideration when selecting a steam-powered actuator, as it must be able to accommodate the flow of steam needed to power the actuator. The diameter of the steam pipe will affect the flow rate and pressure of the steam, which will in turn affect the performance of the actuator. A larger diameter pipe will allow for a greater flow of steam, while a smaller diameter pipe will restrict the flow and potentially reduce the performance of the actuator.

That&#;s why Steam diameter is not an important consideration in electric actuators, as they use electricity as their power source, but it is an important consideration in steam-powered actuators, as it affects the flow rate and pressure of the steam, which will in turn affect the performance of the actuator.

Output speed: The output speed of an electric actuator refers to the speed at which the actuator can open or close the valve. The output speed is an important consideration when selecting an electric actuator, as it directly affects the performance of the actuator in the specific application.

A faster output speed will allow for a quicker movement of the load, which can be beneficial in applications where speed is a priority. However, a faster speed can also increase the required torque and power consumption of the actuator.

A slower output speed, on the other hand, can reduce the required torque and power consumption of the electric actuator, but it can also increase the time required to move the load.

The actuator's control system can control the output speed by controlling the current or voltage supplied to the actuator's motor, which in turn rotates the output shaft. The actuator's control system also can provide feedback on the position, speed and torque of the output shaft.

In summary, output speed is an important consideration when selecting an electric actuator, as it directly affects the performance of the actuator in the specific application. Faster speed can increase the required torque and power consumption but also can increase the speed of the movement. Slower speed can reduce the required torque and power consumption but also can increase the time required to move the load. Actuator's control system can control the speed and provide feedback on the output shaft.

In conclusion, when choosing an electric actuator for a valve, it's important to consider the operating torque, operating thrust, output shaft rotation, stem diameter, and output speed required for the specific valve and application. It's important to consult the manufacturer's specification and choose the electric actuator that meets the project's requirements.

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