Definition: The actuator for a pneumatic or hydraulic control system is the device which controls the flow of a fluid (e.g., air, gas) from an external source to a specified position on a surface. In this case, the actuator is called 'a valve'. The valve provides a means by which the flow of a fluid can be controlled. In essence, the valve is what allows the pressure in a system to control the flow rate or amount of fluid that flows through a device. The word "actuating" refers to the action taken on an actuator as it moves the fluid to a desired position. This could be due to a change in pressure, temperature, or velocity of the fluid, among other factors. The goal is for the actuator to provide control over the flow rate or amount of fluid that flows through the device. In summary, "actuating" refers to the action taken on an actuator as it moves the fluid to a desired position. This could be due to a change in pressure, temperature, or velocity of the fluid, among other factors.
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