how to use "smart valve" pumps? i got one floor pump with a so called "smart valve". it came with no instructions whatsoever. and I'm not smart enough to use it...

I tried it on both type of tire valves, and no matter what i do, it never press the internal valve mechanism to allow air in.

it is similar to this one:



How should i use it? do i have to turn something on the tip to adapt to either type of valve?
I have a pump with what looks like an identical head.  Here's the instruction pdf that they provide. The instructions provided are as follows.


Remove the dust cap from the tire valve. 
For Presta valves, unscrew locking nut at the 
end of the valve.
Wipe off any mud or dirt from the outside 
surface of the valve stem; this ensures the pump's 
Clever Head will work properly.  Also, release 
some air from the tube by pressing the air release 
tip on the valve to clean its inner parts.
Press the Clever Head on to the Presta or 
Schrader valve stem as far as it will go and open 
the thumb lever to the locked position.
The pressure gauge has a red arrow on the 
bezel that you can rotate to the desired pressure 
for easier reading.
Infate your tire by lifting the pump handle up 
and pressing down.  Do not over pressurize tire; 
see side wall of tire for maximum pressure value.
Use the pressure release valve to lower and 
adjust tire pressure.
Move the thumb lever to the unlocked position 
and remove the Clever Head from the valve stem.
For Presta valves, tighten the locking nut at the 
end of the valve.
Replace dust cap


For presta valves, I usually don't undo the locking nut the entire way, as I've had problems with them bending and snapping.  Only undoing it half way seems to prevent this for the most part. Also, After I've mounted the pump in step 4, I press the air release button. If you hear air coming out, then it ensures the pump head is seated properly.