We are supporting the vacuum storage bags as sold on http://www.storeshop.com/vacuum_storage_bags.html which do not have any valves to break.
OK, the unhelpful bit over :)
The way we suggest you proceed is to go to
http://www.uspto.gov/main/patents.htm
And do some patent searches. This will bring up references to inventers and manufacturers who have patents on these valves, there are also contact details.
This should get you close to your destination.
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