Normally open honeywell zone valve motor operation

I have a normally open honeywell zone valve with 24VAC, 5W, 6RPM output motor actuator. The valve closes on when energized. The model is V8043D1205/U. The thermostat is reverse acting. In summer months if we turned down the thermostat, the thermostat will send 24VAC to the valve motor and the motor will operate to close the valve. Once the valve closes fully, what happens ?? Will the motor keep operating / turning trying to close the already closed valve and damage the gear assembly and also causing overheat in motor that will burn the motor ?? Is there any mechanism inside to stop motor turning the gears once the valve reaches full close position - otherwise damage will result ??