Release valve info needed..

I've had a slight change of plan with the Type XX111 ballast system, instead of using that large water pump, I'm thinking of using my little Koge air pump, and inflating a small(ish) bag instead. I can attach the bag on top of the cylinder with velcro, that will save a lot of internal space in the cylinder.

Question: If I use the air in the cylinder to inflate the bag, what's the best way to release that air and return it to the cylinder? I'm guessing a small valve of some sort (I cannot find the solenoid valve that came with the pump) something like a servo operated pinch valve, along  the lines of those used in the Sheerline boats? Or is there a better and easier way of doing it?

The smaller the better...





Richard

I've just tried this pump, and running on 4.8v it filled a small SHG bag in seconds, so it should be ideal for the Type XX111.


Richard

I don't use air systems much but you are talking about a valve for fairly low pressure, low pressure drop and no external leaks.

Modified Schrader (tyre) valves always come to mind but they are not quite right here - pressure a bit low.

I would have thought that the pinch valve would do the job. The only likely leaks would provide you with a fail safe.

David

PS Just thinking about this one. Will the bag not need the pump to also empty it? (My lack of experience of air systems is showing!)

I was thinking of a pinch valve, but then someone suggested a tyre valve(which I haven't got)so a pinch valve is on the bench as we speak...as you say, the air leak may come in useful.


Richard

Plse see my edit, Richard.

David

It's a one way pump David...more's the pity.


Richard