Pneumatic dome valves are primarily used for the control of powdered and granular materials and are commonly found in pneumatic conveying systems, such as those in power stations, chemical plants and mines. Firstly, I need to determine their structural design, including the valve body, dome structure, pneumatic actuator and sealing system. The core component of a dome valve is the dome-shaped closing element, which must provide excellent sealing performance and be suitable for dusty and granular media.