Exactly how does it work in the putz? Does it ever leak out? Once you turn the pump off it goes back into the bag? Any answers in detail would be appreciated thank you, sorry if its a stupid question I'm just trying to learn everything about pumps. 

I assume you are referring to the nitrogen on the accumulator, there is a rubber bag inside the accumulator housing, when you fill and charge the bottle, the bag expands and follows the contour of the inside of the bottle. There is a check valve on the bottom of the bottle, that prevents the bag from being pushed out of the bottle. When you turn on the hydraulics, the pressure that is built in the circuit is compressing the bag, making it smaler. Gas pressure is always half of the hyd circuit pressure, if hyd pressure is 200 bar, your gas pressure is 100 bar, compressing the bag to half of its size. On a 6L (1.5 gal) accumulator, you end up with with 3L (.75gal) of extra oil, that is used when there is a high demand in a short  amount of time, such as rock valve/ s-tube shift.

nitrogen stays within the bag, (unless there is a leak)

hope this helps

Gboom is right about the accumulator.

I just want to add a bit, the bladder is rubber like an inner tube, but the rubber is porous even a brand new one will leak a bit of nitrogen over time, I believe the speck is about 2 to 5 %, this is why it is important to check the nitrogen precharge at least weekly. If the nitrogen is low the valve will get slower or sluggish in shifting, also when the pump compresses the bladder it physically gets distorted or compressed more causing higher bladder wear. Think like a car tire, low pressure causes higher wear.

So depending what type of pump you run it is good to monitor the nitrogen, it is amazing how many I will find low when inspecting them.

Another point is this Check the gauge, it cycles every stroke and can also wear out and give the incorrect reading, so if you think the Nitrogen is low confirm it with a trusted gauge.

most of the operator in our company didnot checkt he nirtrogen pressure they only come to us when is s-pipe are not switching and ofcourse in this case you have to change the bladder also