in a Flash or NOT

i just got my Jetboil Flash off ebay (thanks for the info flatfoot- WOW what a saving compared to buying in Aus) and found that you need to turn the valve over two full turns before you can hear gas coming out. Thought it was faulty at first as i could not get it to ignite till it was nearly fully open. I found on other brands of stoves that you can hear the gas as soon as you turn the valve open. Does anyone else have this ? or is mine a dud? 
