For the last 10 or so years I've been replacing teflon and Garlock gaskets with the 304/teflon Flexitallics. I've even had custom ones made for a valve bonnet when it's applicable. Never had a problem with one Flexitallic. The Teflon and Garlock are good but we have had experiences with a few...
I'm looking for information on how to replace the stem packing on a Plug packing type system without having to disassemble the valve. Just never worked on one of these and thought it would be easier to ask for help. Any web sites or suggestions?
Thanks
Scooter
Shot in the dark here but we use a lot of inflatable seals in the vacuum industry. Could even pull a vacuum behind the seal when you want it to open up. Not sure on your size requirements but this works quite well.
Good Luck
Karl,
To see a good example of ducted fans I suggest you go to ebay and type in Hovercraft, it'll give you a good idea of how long batteries will last and only cost a few bucks, be fun playing with the toy too. To simplify this, how about a few dimensions on the playing field and anticipated...
Check the model airplane industry. They use allot of R/C servos and valves. Problem with everything on board, is you have to power it with batteries, they are heavy and have to be charged. I was thinking a real small coiled hose from an air supply and small multi-ribbon wire for controls...
Are you doing the thruster valving on or off the shuttle model. I'm thinking you stay with what you have and look at a better way to get the air to the model. Take a look at www.beswick.com, they specialize in miniature tubing and fittings.
Scooter
I looked in the "Safe use of Oxygen and Oxygen Systems" book from ASTM and it doesn't recommend it because they ignite easily and offer little weight savings. All sources of ignition must be identified and removed from the system. Try calling Joel Stoltzfus, 505-524-5731, he's with Nasa at the...
I'd go with Kapitan's suggestion, they make a curved torch tip specifically designed for this application, check you local welding supply. If you do go with the electric drill, you could use an end mill to remove the head. I think you might end up using a combination of methods.
Scooter
Jim,
We've had our problems with backstreaming of oil in the past, it usually happens when the backing pumps are turned off and the system is left under vacuum. The oil vapor will move upstream and condense in cooler places. We have a series of roots blower backed by two stokes 412s with...
I proposed that, we have 14 36 inch DP's without traps and 4 with and they do not want to take the chance that they might deposit oil from the trapped DP's so they want turbo pumps backed by roots blowers, we have the backing system already. I was just looking at a better way to pump the 70,000...
Torricelli,
Planning on doing that, but I'm needing somewhere in the neighborhood of 70,000 l/s pumping speed for He. This will take a number of the Varian pumps. Since I can't use a diffusion pump, due to possibility of backstreaming, I'm stuck with turbos.
