Which device is responsible for driving valves or mechanical systems in pneumatic applications?

In pneumatic applications, a pneumatic actuator is specifically designed to convert compressed air into mechanical motion, making it the primary device for driving valves or mechanical systems. These actuators work by using the pressure of the compressed air to create movement, which can then be used to open or close valves or to operate various mechanical systems.

Pneumatic actuators can be single-acting or double-acting, depending on how they control the movement and return of the actuator. This functionality makes them essential in applications that require precise control of mechanical movements, particularly in industrial automation.

Other devices mentioned, such as a hydraulic motor, pressure regulator, and flow switch, serve different functions within fluid control systems. A hydraulic motor operates on fluid principles and is used in hydraulic systems, while a pressure regulator controls and maintains pressure levels in a system but does not directly drive mechanical systems. A flow switch is used to monitor the flow rate of fluid but does not facilitate the movement of mechanical components. Therefore, the pneumatic actuator is the appropriate choice for driving valves or mechanical systems in pneumatic applications.