Valve selection

First question: The selection of the valve port diameter can be based on the parameters provided by the manufacturer, or it can be calculated using the Cv value. Typically, valve manufacturers will provide corresponding diameter options based on the Cv value and fluid parameters. However, users can also calculate the diameter themselves, for example by using flow formulas to determine the required diameter. For the specific calculation method, refer to the valve manual or relevant engineering manuals. Second question: The calculation of the output torque of the actuator requires comprehensive consideration of factors such as valve type, valve size, and operating angle. Typically, valve manufacturers provide corresponding output torque parameters based on these factors, to help users select the appropriate actuator. However, if the relevant manufacturer data is not available, users can also calculate the output torque of the actuator using certain mathematical formulas, for example by taking into account parameters such as the valve’s stiffness coefficient and its opening angle. For specific details, refer to the relevant manuals or technical documents for valves and actuators. .

The output torque of an electric actuator is determined by the torque required to open and close the valve; this value is usually specified by the user or chosen by the valve manufacturer itself. As a manufacturer of electric actuators, one is only responsible for the output torque of the actuator itself. The torque needed to open and close the valve properly depends on factors such as the valve diameter and operating pressure. However, due to differences in manufacturing precision and assembly techniques among valve manufacturers, valves of the same specification produced by different manufacturers may require different torques. Even valves of the same specification produced by the same manufacturer can differ in terms of torque requirements. If the torque of the electric actuator chosen is too low, it will be impossible to open and close the valve properly; therefore, it is essential to select an appropriate torque range for the electric actuator.

1. The CV value does not represent the valve port diameter; it must be selected by the manufacturer based on calculations, and the same CV value can correspond to different diameters. 2. Select the appropriate actuator based on the torque provided by the valve manufacturer, taking into account a certain safety factor.