The purpose of this post is
to explain the three main types of
pressure canner weights.
The first type of weight is almost always found on canners with gaskets. It is a three part weight that actually threads down onto the vent stem. Note the vent stem shown here with a threaded top. You should periodically check this vent with a toothpick to make sure it isn't clogged.
Picture of Vent Stem below dude to Picture Limit.
The next picture is of the actual weight with two of the three parts shown. Each of the three parts gives you 5 pounds of weight, so the picture below would be for 10 pounds of pressure. There are slots on each weight so you can slide on and off weight as you need it.
This picture shows all three parts of the canner weight in place (for 15 pounds of pressure) and barely threaded onto the vent valve. This is the position used for venting the canner before applying the weight fully. The canner won't build up pressure as long as the weight isn't fully screwed down.
Note the weight fully threaded onto the vent valve. When screwed in completely, it sits directly on the canner lid. At this point, it will be loose and move freely but still still stay in place. If the weight is in this position, the canner is sealed and will start to build up pressure.
The next picture is of a pressure gauge, note the pressure readings along with the temperature. If your canner doesn't have a gauge, you will have to rely completely on the weight.
Picture of Pressure Gauge below dude to Picture Limit.
This is the second type of vent closure and does not use a weight at all. These are most commonly found on older pressure canners and they require the use of a pressure gauge. This type of closure is never removed from the canner like a weighted closure. It has a lever on it that flips up to vent out and flips down (as shown) to build and maintain pressure. This is by far my favorite, but is also the most dangerous.
This third weight type is very similar to the first. The vent stem shown below is shaped like a cone to allow the weight to sit snugly on it. These are most commonly found on gasketless canners like the All American.
The weight itself has three numbers corresponding to pressure. It sits directly on the cone shaped vent valve to seal the canner, 10 pounds shown here. This weight type fits nicely, but is not actually attached like the first weight type. If the weight is off, the canner vent is open. If the weight is on, the canner is able to build up pressure.
Personal Note (Radio): We (Family and I) are fairly new to prepping/survivalism/canning/etc. When we first started out, we made huge and costly mistakes. This re-posting is meant to help those of you along your way so that hopefully you find an easier time.