Vacuum safety valve for dust collectors

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Forum topic by b2rtch posted 03-08-2013 07:43 PM 1168 views 2 times favorited 2 replies Add to Favorites Watch
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4861 posts in 3075 days

03-08-2013 07:43 PM

Many of us use dust collectors.
The most powerful ones can develop enough vacuum to collapse the 26 gauge galvanized pipes.
I had this concern, so I came up with the idea for this vacuum safety valve.
I show the pictures so that if you need it you can copy the idea.
It works very well.
It remains close with one port partially open and it opens with all port closed.

I used a duct end cap, a piece of plywood, a CD (new!), a spring, a piece of 1/4” all thread and a few nuts and washers.

I hope this help.

-- Bert

2 replies so far

View JoeinGa's profile


7736 posts in 2034 days

#1 posted 03-08-2013 08:22 PM

So do you have a dedicated port where this stays? Or do you just stick it in a port close to where you’re working.
And I’m gonna say this because I KNOW someone will ask. It took me just a minute to figure out that the spring-end stays OUTSIDE of the duct outlet… right?

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4861 posts in 3075 days

#2 posted 03-08-2013 08:29 PM

I installed it at one end of the duct.
I might install it in the center later.

-- Bert

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