Locate the valve closest to the lead pipe. This is the first valve. The second valve is in the middle and the third valve is closest to the bell.
Remove the valve caps on each valve by turning in a counterclockwise direction. Pull the valve out of the valve casing.
Identify the number that appears on the top of the valve at the base of the valve stem. You may have to pull up the cloth ring that acts as a cushion between the valve top and the valve cap. Often, only two of the valves are numbered since the third valve is implied based on the numbering of the two other valves.