Jo_Bai Posted December 5, 2023 Share Posted December 5, 2023 You are talking about the wooden one right? do you mean this one? Quote Link to comment Share on other sites More sharing options...
George N. M. Posted December 6, 2023 Share Posted December 6, 2023 OK, after watching the video I understand how it works. Part of my problem is that I didn't see the hole in the lower right where the air goes to the forge. If you just had a restriction in the air flow from the blower which increased back pressure in the system when the valve was partially shut would that really damage the blower and how? GNM Quote Link to comment Share on other sites More sharing options...
Mike BR Posted December 6, 2023 Share Posted December 6, 2023 I guess roughly speaking, the bypass would set the pressure and the choke would set the volume. A low pressure high volume blower could stall before you could restrict flow enough with only a choke. And if you used only a bypass, there might not be enough pressure available at the tuyere to overcome a tighter-packed fire. The better option is probably to use a more suitable blower. But then I make do with what I have too much to criticize someone else. Quote Link to comment Share on other sites More sharing options...
Frosty Posted December 6, 2023 Share Posted December 6, 2023 His stated concern wasn't for back pressure damaging anything it was for reduced air flow through the motor allowing it to overheat. Some electric blowers use the blower itself to draw air through the motor, some don't and use the fan cooled sealed motors for dusty environments like wheat elevators, etc. Frosty The Lucky. Quote Link to comment Share on other sites More sharing options...
JHCC Posted December 6, 2023 Author Share Posted December 6, 2023 If the inlet from the blower, the outlet to the forge, and the outlet to the exhaust port are all the same size and if the valve design ensures that (a) when either outlet is completely open, the other is completely closed and (b) when either outlet is completely closed, the other is completely open, then the airflow through the valve will remain at a constant total volume and pressure. Quote Link to comment Share on other sites More sharing options...
Davor Posted December 9, 2023 Share Posted December 9, 2023 I've made the metal one from DF-s video and I'm very pleased with it, been using it for quite a while. Works great. Quote Link to comment Share on other sites More sharing options...
Davor Posted December 12, 2023 Share Posted December 12, 2023 New use for the valve. I have an unfinished chimney so I struggle with the smoke (until it heats up) and ash. And I've been thinking about putting a fan to blow the smoke out the shop. But since I'm dumping most of the air from the blower, got a temporary solution. Quote Link to comment Share on other sites More sharing options...
JHCC Posted December 12, 2023 Author Share Posted December 12, 2023 Yes, redirecting the air dump is also a good way to cool off when standing by a hot forge on a summer's day. Quote Link to comment Share on other sites More sharing options...
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