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Old 09-04-2011, 07:31 PM   #11
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The pump needs to have back pressure on the discharge to properly operate. The larger hose is giving no back pressure..use a valve on the discharge

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Old 09-04-2011, 10:02 PM   #12
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Originally Posted by WalterAtMarchPump
the pump is designed to be used with 1/2" going larger you are allowing the pump to try and exceed its rated flow rates because there is less resistance on the outlet side. That puts a larger stress load on the mag drive and you could de-couple it. could have a slightly less then normal magnetized impeller......when they run the magnetizer here they check every 10th or so piece. Most times they are way stronger then what we require...but every so often we do get a weak one come out. If you want to send it to me I can test it for torque. If not then just use 1/2" line and you probably will never have any problems.

Ah... is that why some of the pump heads have a 3/4" inlet but all of them have a 1/2" outlet?
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Old 09-05-2011, 01:42 AM   #13
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Originally Posted by emjay View Post
Ah... is that why some of the pump heads have a 3/4" inlet but all of them have a 1/2" outlet?
Yes input to a pump needs to be greater then the output or it cavacates, basicly the impeller spins faster the the liquid drawn into it. So either a 3/4 dip tube or restrict/valve down the output, I would go with a larger dip tube then put the pump at
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