Question on dust collection when using a separator

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Forum topic by Bill1974 posted 12-20-2012 08:45 PM 1058 views 0 times favorited 1 reply Add to Favorites Watch
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124 posts in 2985 days

12-20-2012 08:45 PM

I think this questions applies more to a shop vac and separator than a dust collector, but it may apply to both.

Would it make sense to put a relief valve in between the point of dust collection and the separator? The reason I ask is that more separators rely on the velocity and centrifugal forces to separate the dust from the air. Most of the time that i would use a shop vac it would connected to a palm sander, router, circ saw etc (hand help tool) and most of those tool have smaller ports on them then the 2 inch shop vac hose. I forget what negative pressure a dust collector works as, but it’s less then a shop vac. I am thinking that if the relief valve would be set to allow less negative pressure there would still be good air flow into the separator to allow enough air velocity and centrifugal forces for the separator to work better.

Just some food for thought.

Thanks for your thoughts

1 reply so far

View Lifesaver2000's profile


551 posts in 3112 days

#1 posted 12-21-2012 07:32 PM

I can’t really say if the relief valve would improve separation or not, but it would make sense, and it would be useful to prevent collapse of the separator container. There is a plan for one over on the Thien forum

that looks like it would be fairly simple to build, and could do just what you are talking about.

When I used a shop vac and separator, I did notice that the smaller connections on the router or sander would make the vac sound like it was working harder. Even if the valve didn’t improve separation, it might make the vac last longer by not letting it be starved for air and overheating.

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