Search the forum,

Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure

Discuss Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure in the USA area at PlumbersForums.net

B

Blackrock63

Messages
3
I have a Grundfos MQ series domestic pump and it has started cycling on and off. The pressure at the outlet reaches approx 2 bar of pressure and the pump shuts off. The pressure then immediately drops as it overflows out of the Pressure Relief valve. Once the pressure gets to 1.5 bar the pump kicks in and the cycle of off/on starts again and again.

I have today replaced the pressure relief valve and the pump was fine for about an hour and now it has started to go through the same process of dumping water out the pressure relief valve and cycling through the on/off process of getting up to 2 bar and then losing pressure.

Attached is a short video of it happening and a picture of the pump and PRV.

Does anyone have any ideas as to what the issue may be?

Thanks in advance of any help and support you can provide

Blackrock63
 

Attachments

  • IMG_1446.JPG
    IMG_1446.JPG
    94 KB · Views: 9
  • IMG_1448.mp4
    3.1 MB
UPDATE: I have managed to sort this issue. It turned out to be a faulty expansion vessel which Dumb& Dumber plumbers had fitted incorrectly. The PRV did keep releasing water for a few days after i replaced the EV but it now seems to hve settled down and everything seems good again
 

Reply to Pressure Relief Valve Overflowing & Grundfos MQ Pump pressure in the USA area at PlumbersForums.net

Similar plumbing topics

S
Pressure Relief Valve Behind Washing Machine Problem
Hi, all. I have a leak problem behind the washing machine. It's a pipe that is leaking directly into a drain. It used to drip but now is leaking a steady stream without stopping. Seems to be coming from water heater but I cannot tell. It is cold water. When I turn off the main water supply, it...
Replies
6
Views
583
Pritesh Patel
P
D
Boiler pressure dropping to zero when heating turns off.
Good afternoon, I am experiencing a pressure issue with my heating system and was hoping to receive additional insight as to what the problem could be. We have a biomass boiler and stratification tank set up and recently had an issue with boiler pressure dropping off when the system was cold...
Replies
9
Views
342
ShaunCorbs
ShaunCorbs
G
Surging jet pump not reaching cut off pressure
Hello, I need some help. Problem: my jet pump fluctuates between 15-35psi and will not build any pressure higher than that. There is a swooshing or surging sound that continually occurs. Location: it pulls water from a lake to supply the house. Lift is 40ft distance from foot valve to pump...
Replies
0
Views
451
glaxy1
G
C
    • Like
Grundfos Alpha Pump replacement
Hello, my Mothers heating failed in the recent UK cold snap. I found the pump was stuck. I have a question about pump orientation. The existing pump flows downwards. The manual for the proposed replacement recommends that it should pump upwards. This would involve rearranging the flow &...
Replies
8
Views
604
Clockdoc
C
A
Boiler losing pressure without any leakage
Hello! I have a combi boiler (n8 topline compact hrc 30/cw5) required to fill in 1.5 BA, 8 radiators, and heated floors in the same system. I have a pressure loss problem, I lose ~0.3-0.4 every week without visible leakage. I had 2 plumbers and 1 guy from the boiler gas service company. The...
Replies
3
Views
886
ArtemPtushkin
A
Creating content since 2001. Untold Media.

Newest Plumbing Threads

Back
Top
AdBlock Detected

We get it, advertisements are annoying!

Sure, ad-blocking software does a great job at blocking ads, but it also blocks useful features of our website. For the best site experience please disable your AdBlocker.

I've Disabled AdBlock