I accidently erased all the pictures in this post. So I'll try again
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Here is the smelter mounted on the stand
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The top of the pot and the upper linkage
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The foot pedal and lower linkage
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The bottom of the pot, spout body and spout. The spout has different inserts of varying diameters.
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This shows the two valve rod guides.Directly below them is the valve seat, it is a 3/8" radius machined into the spout body.
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This is the tip of the valve rod, I turned a 3/8" radius on it using a lathe.
I used HotGuns' design, I merely added a foot pedal and linkage to his design. Like he said in his post this valve design will hold water. Once in a while it will drip if I bump the stand pretty hard. I left a shoulder on the top of the valve rod so I could add a weight to help put a little more pressure on the valve seat. This has worked pretty well for me, I have smelted 800-900 pounds so far. I can't say that it is better or worse than the turkey fryer/ dutch oven set up because this is all I've used other than a hotplate. I am currently building a dutch oven/ industrial water heater set up just to see the difference. jmsj