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Old 07-14-2007, 04:10 PM   #1
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Grundfos pump flange


I want to mount a Grundfos UPS15-58F pump. The centerline measurement for the bolts is 3 and 5/32 inches with round holes. Which flange should I use, "The Isolator" flange 50404 which has a round bolt centerline of 3 and 3/16 inches, or rather the 50404HV, which has an oblong bolt centerline of 3 and 1/2 inches.

The oblong bolt holes on the 5040HV look like they have some play while the round bolt holes on the 5040 (at 3 and 3/16 inches) don't look like they have any play.

The specs for the flanges are at www.webstonevalves.com/pdfs/Iso_4pg_silver_final_tscreen.pdf

Would the Taco 00R-MSF1-IFC be as good or better than the Grundfos?

Would any other flanges be as good or better choice?

Thanks for any help.

Mike Warner

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Old 07-15-2007, 11:44 AM   #2
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Grundfos pump flange


Most residential pumps flange sizes are pretty interchangable. IE: b&g series 100 fit Taco oo line, etc. Taco is usally cheaper than Grundfos or B&G in my area so they get used more and are more readily available. I prefer Taco to other small pumps, they last longer than most.

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Old 07-16-2007, 10:50 AM   #3
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Grundfos pump flange


Thanks MechanicalDVR, also thanks for the input on my primary loop question.

Mike
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Old 07-16-2007, 09:54 PM   #4
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Grundfos pump flange


No problem, anytime
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Old 07-16-2007, 10:20 PM   #5
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Grundfos pump flange


I can't tell you which Grundfos pump in just installed, but I used off the shelf Watts valves...they fit great. There's a large flat space for the sealing washer. As for reliability, while I don't want to throw money away...with an isolation valve on each side of the pump, two bolts and a 3 wires and it's outta there...so I'm certainly not going to worry about it.

By the way...I may have to inquire with my supplier about those valves with with the drains...nothing like killing 2 birds...I guess it'll come down to pricing.
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