BROOKS BRADLEY wrote: > Our principal problem was in finding the proper > continuously-relieving escape valve for the chamber proper. We > evaluated several off-the-shelf, and custom made commercial valves. All > worked to some degree, but we are, at present, testing a method whicn > uses only a couple of variable-diameter holes fashioned in the outer > fabric and reinforced against tearing. This latter approach is by far > the most economical. However, the downside is that the pressurizing > air-supply compressor system is required to supply much greater > quantities of air....to keep the bag properly inflated (at about 2 > atmospheres) and to evacuate the C02 sufficiently. >
Consider using a 1 inch or so diameter plastic pipe which is turned up on the end. Then place a hollow plastic ball which is larger then 1 inch in diameter on top of the opening. This will regulate the pressure quite effectively. Since the area of the pipe will be 3.14/4 = .785 square inches, then the pressure will increase about 1/.78 = 1.27 psi per pound the ball weights. So for a 15 psi level (2 atm.), you would need the ball to weigh just under 12 pounds. If you use a 2 inch ball, it will have a volume of 4.2 cubic inches. Filling with water would give .43*4.2 = 1.85 pounds. To get a weight of 12 pounds would require filling with something with a specific weight of about 6.5 or more. This could be accomplished by filling about 80% full with iron filings. Marshall Marshall -- The silver-list is a moderated forum for discussion of colloidal silver. To join or quit silver-list or silver-digest send an e-mail message to: [email protected] -or- [email protected] with the word subscribe or unsubscribe in the SUBJECT line. To post, address your message to: [email protected] Silver-list archive: http://escribe.com/health/thesilverlist/index.html List maintainer: Mike Devour <[email protected]>
