Leaking Grundfos pump

[robspan]

hi everyone,

I just replaced a dead Grundfos circulating pump (without a label on it !) with a new Grundfos 15-50.

I had to change both the leaking valves, and then shorten the pipe because the new valves are longer, but that's another story....

When the valves are open, whether the pump is on or off, there is a persistent drip through the side of the pump's name plate !

The pump is installed pumping downwards, and is 15cm after a corner - both against the rules....

Could the pump be too powerful ? Not powerful enough ? or just broken ?

help !

-rob-

 

[oilman]

Sounds like the seal round the pump's bleed screw is faulty.

 

[robspan]

yes,

i put the old screw back in & no leak

looks like the rubber washer on the new screw is about 3mm too thick,
or my superhuman strength is turned off today

thanks for that