To open a valve on a water tap, which action is taken?

The correct action to open a valve on a water tap is to turn the handle counterclockwise. This action typically engages the valve mechanism, allowing water to flow freely from the tap. Most tap designs operate on the principle that turning the handle counterclockwise increases the opening of the valve, thus permitting water to exit.

In many standard plumbing systems, this counterclockwise motion is universally recognized as the method to open faucets, commonly referred to in phrases like "righty-tighty, lefty-loosey," where loosening generally involves a leftward (counterclockwise) motion. The counterclockwise action aligns with standard designs for both traditional and modern taps, making it the practical and correct choice for opening a valve.