Darryl Keil Last Activity 2026-01-12 8:29 AM
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Carl Stammerjohn

Posts: 4

Joined: 2003-09-16
Location: Torrance, CA

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Subject : Vacuum line fittings
Posted : 2003-09-16 7:34 PM
Post #30991
At Cerritos College, where I teach, we are setting up a new vacuum system with vacuum line drops throughout the shop. Can we use 3/8" quick disconnect fittings for the vacuum lines? I was told they might leak a little, but we are running a large pump external to the building and a little leakage won't be a problem. The 3/8" QD's are readily available and relatively cheap, but we want to ensure we won't have a problem later.



 
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Darryl Keil

Posts: 1456

Joined: 2003-05-22
Location: Maine

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Subject : RE: Vacuum line fittings
Posted : 2003-09-17 10:20 AM
Post #30995 - In reply to #30991
Carl,

No you can not, for three reasons.

Standard quick disconnects are made for compressed air and do not work for vacuum as the pressure is in the wrong direction. They will leak more than is acceptable, especially with a number of stations.

Second, they restrict the flow considerably. The mechanisms in a quick disconnect fitting that make it self sealing are a major bottleneck.

Third, these same mechanisms collect any small wood chips that may be drawn down your lines and over time back up the air flow so badly that you can hardly pull vacuum at all.

Get open flow quick disconnect fittings meant for vacuum that do not self seal when disconnected and put a shut off valve in line.

Sincerely
Darryl Keil


 
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Carl Stammerjohn

Posts: 4

Joined: 2003-09-16
Location: Torrance, CA

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Subject : RE: Vacuum line fittings
Posted : 2003-09-17 11:40 AM
Post #30996 - In reply to #30995
Thanks very much Darryl. Are the Colder Products fittings, like the one on my VPS venturi pump, a good way to go? We could use CPC straight-thru couplings for the connections and ball valves for shutoffs.


 
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Darryl Keil

Posts: 1456

Joined: 2003-05-22
Location: Maine

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Subject : RE: Vacuum line fittings
Posted : 2003-09-17 6:10 PM
Post #30997 - In reply to #30996
Carl,

CPC fittings are great. I would use them along with the ball valve.

Sincerely
Darryl Keil
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