Thread: Vacuum relief valve needed for Dust Deputy

I would instal a second line (sander side of tin) with a blast gate. You could adjust the suction to suit the item your using at the time.
Cheers jason

A simple relief valve can be made as follows
Find a short length of PVC pipe (~150 mm long) that fits easily inside the flexy and locate it somewhere near or attached to the sander for convenience.
Put a 12 mm hole in one side of the middle of the PVC pipe.
Using the same diameter PVC cut a 25 mm long annulus of PVC and cut it on one side length wise and the slide it up over 150 mm long PVC piece so that it can slide back and forth over the hole.
You may need to smooth the inside of the 25 mm and outside of the area around the hole so that it can easily be adjusted.

The idea of using a huge can with a collar is brilliant. I think Ill steal that. Printers use really big ones to receive rolls of paper.

As for control, this idea of suction control was used on old eletrolux vacuums. Drill a hole where I've artfully photoshopped one in. Cut a section of the original pipe as long as where I've made the red demo on the pipe, fit this cutout over the illustrated section. The ridges of the pipe underneath will match the ridges inside the sleeve (or close enough).

Simply rotate the pipe edge to expose a large or small section of the underlying hole.

If it whistles, chamfer the edges.

bucket.jpg

Thanks gents for these interesting replies, much appreciated. I like the idea of a fixed piece of inline PVC with a hole, and prefer the rotation cover piece rather than a sliding piece - should take up less room.

Evanism, you will see in my 3rd photo a bit of square stuff in the bottom of the paint tin - that is 2 pieces of 100 x 100 x 10 flat steel bar epoxied together and to the base of the can to give stability. Works well too, doesn't topple over any more. The paint tin handle is great for carrying it around too

I just re-read BobLs response. It's more sophisticated than mine! Probably better too.... Mine is just a quick hack.

An improvement might be to drill a hole in the centre of the sleeve as well, on the oposite side of where its split. This might give a better seal and reduce whistling. It might also provide slightly better granularity to control.