Regarding the selection of ball valves!

Generally, according to the switching torque, the handwheel is used for larger torque, and the handle is used for smaller torque. When the valve is large, or when automatic control of remote transmission is required, electric or pneumatic control is required. It is recommended to use pneumatic in generally flammable and explosive areas. I haven't checked the relevant information, so it's just my personal understanding. :lol

Use a handle for switching values, a handwheel for many adjustments, pneumatic for explosion-proof, and pneumatic for high reliability requirements. Electric is generally used when the investment scale is small and the air source is insufficient. Electric needs to overcome current and voltage fluctuations. It is not used in adjustment situations. Switches are better.

Manual: Use the hand wheel for DN200 and above, and use the handle below. The main reason is to consider the operating strength. automatic: pneumatic for adjustment ； The switch can be electric or pneumatic.

The situation is this. Ball valves are generally used for switching and are rarely used for adjustment. If the process requires the use of remote control signals, you can consider using pneumatic or electric ones. Both pneumatic and electric ones can be used to control the opening or closing of the ball valve. If there is a convenient air source, it is generally better to use a pneumatic actuator. ； If the air source is too far from the valve or there is no air source at all, an electric actuator can be used. Both pneumatic actuators and electric actuators are available in flameproof types. However, the switching speed of electric ones is not as fast as that of pneumatic ones. In addition, when the valve is required to be closed or opened when the gas source or power supply fails, it is easy to use a pneumatic actuator, but it is more difficult to use an electric actuator.