[HitTheTrail]

This valve for transferring gas between your backpacking stove canisters may already have been discussed here but I could not find it in a search so here goes. It is a valve with two Lindal thread openings so you can safely move gas from one canister to another. This is handy if you have a bunch of half used canisters and want to move the gas to make a full one. Also, it will allow you to use the larger 500g canisters at a fraction of the gas cost of a 100g and just keep filling the smaller canister after each trip out. You can even use the cheap off brand name large canisters at supermarkets like Fred Mayer to lower your gas costs. I am sure the gas is just as good. The gadget is called a G-works gas saver($21) or gas saver plus($32). The gas saver plus has a fancy button on the side to release gas vapor in the canister being filled but I am not sure it is worth the extra money. There are tons of them for sale on ebay but I would recommend getting one from Amazon to insure the quality. Also, check out the other Lindel valve adaptors listed on Amazon.

Valve

Lindal Valve

Transfer gas

[Riverside Laker]

Do you heat up the full one, and cool the empty one, to get more fuel in there? Might as well take advantage of the ideal gas law.

[HitTheTrail]

The company that sells the thing is an instruction free zone but I listened to some vids on youtube. They all said to put the bottom canister in the freezer for an hour or so and put the top one out in the sun for the same length of time. Some also said to just turn the valve on and go to bed and it will eventually fill. I didn't do either and it seemed to fill ok. It makes a big difference what the differential is between the two gas volumes.

[Randito]

[Malachai Constant]

Good luck guys, I draw the line at refilling disposable cylinders. Like my house and hair too much. as the King of the Hill says, "propane is a cruel mistress".

[moonspots]

[HitTheTrail]

[moonspots]

[HitTheTrail]

The gas in the top canister is a liquid and is being pushed by gravity and the partial pressure of the gas vapor. The bottom canister has a vent button to release the vapor pressure in a one way valve so it is gravity and vapor on top vs vapor being vented on bottom. Gravity wins. BTW, I have a minor in physics.

[moonspots]

[forest gnome]

unfortunatlelly this is a total waste of time and effort....half or less full canisters, and it's stupid dangerous...yes I have tried several methods.. and the barista who had 2 kids but was filling indoors died from burns.... I'm giving this two ...REALLY STUUUPID!!

[Backpacker Joe]

While I appreciate the information, Ill just use and old one till it dies and bring a replacement. Thanks HTT.

[HitTheTrail]

[DigitalJanitor]

Too funny, husby has been 'sperimenting with this type of gas transfer widget + some super small/cheap knockoff Chinese stoves. He's inordinately pleased with himself and his ingenuity. I'm sticking with the OH stove if I'm running the show.... I have an irrational paranoia about pressurized fuel systems especially after reading "Polar Dream".

[Schenk]

Once the gas pressure equalizes between the 2 canisters then gravity will take over and the liquefied gas will drain into the lowest canister. I am sure the valve in question has this feature, a port to constantly equalize the pressure between the canisters. Imagine 2 bottles of water put together the same way: Neck to neck with one bottle on top. There is no need for a pump to get the water to transfer from the top bottle to the lower bottle, especially if you introduce a way for the pressure to stay equalized between the two bottles (a straw in between the necks). Without that equalizing port/passage it would have to bubble and burp as the liquid transfers, but it will still do it. This seems no more dangerous than refilling a butane lighter, and probably safer since you actually have a screw-on valve and you are not just holding a tight fit between the lighter and the refilling container.