Rog how tall is the tower and the size of tank? What type of valve is a gate valve?
Carl, total height of the tower without the tank was about 14 inches...requested height by the fellow I made it for. On top of the platform sits a stainless steel cookie jar/kitchen canister (many available on eBay, though often as sets of 4)... the one I used was 8.5 inches tall and 6 inches in diameter with a glass lid. So, total tower with canister on was 22.5 inches tall. Legs were made of 1/2 inch aluminum angle stock sold in 8 foot lengths at Lowes (took two total lengths with a bit left over). Legs were screwed together with 3/8" SS screws and top and bottom were 1/2" plywood. Bottom also had an additional 3/4" layer of plywood added to ensure the whole setup was not top heavy.
Valve used was made by Swagelok (via eBay)...only thing I would change with what I know now. Better to get the kind of valve that opens and closes with 1/4 turn. The one I used must have been designed for very high pressure as it takes about 15 turns to open and same to close. I believe the quick open/shut type is a ball valve, slow open shut a gate valve...but I am happy to stand corrected. A "bulkhead" brass fitting goes in the bottom of the canister for a waterproof outlet...that feeds about 11 inches of brass tubing which goes into the valve. Nothing difficult with bulkhead fittings...lots on eBay. Pricey from the US...dirt cheap from China...I opted for US everything given timing.
I have a few more pics of the tower and valve setup of you can use them...otherwise it is all boxed up and ready to ship this Thurs 3/14.
Rog