Diagnosing banging motor valve

[red_rover]

Hi,
I have a three-zone 2016 house with gas heating. When the downstairs heating switches off, it bangs extremely loudly. I have tried adding clips and it only helps to a point, I would have to take down plasterboard to get at the noisest part. The valve appears to be the correct direction. I have a bypass, which seems to be working. I think the bypass pipe is about 15mm. I don't have any TRVs anywhere in the house. Do you think I might need a new valve or perhaps something like an automatic by pass? Thanks a lot.

 

[Timmy D]

If it’s previously worked fine, then something has failed, ergo you shouldn’t need to change piping etc.

Pressure looks a little low, had any issues with losing pressure, needing to top up more regularly?

Expansion vessel possibly lost charge/faulty?

 

[red_rover]

The pressure can be low. It has to be topped up ever year or so, but it always was banging very loudly.

 

[ShaunCorbs]

Open the red wheel head 1/2 a turn the vertical one

 

[red_rover]

Open the red wheel head 1/2 a turn the vertical one

Thanks for this advice. I tried and sadly it didn't work.

 

[ShaunCorbs]

Thanks for this advice. I tried and sadly it didn't work.

Open it more

 

[red_rover]

Open it more

No luck. It is really baffling me

 

[PETE 123]

Zone valve shutting to quick and to much pressure so open gate valve bypass or try turning pump speed down.

 

[Deleted member 120897]

You say the zone valve appears to be fitted the correct way, any proof of this?

 

[red_rover]

Good point. I really don't understand the system so maybe I got that wrong. Here is a picture of the arrow. Is that the only factor to ascertain its direction. Do I need to open it?

 

[Knappers]

I had a similar issue recently after customer had new boiler with bigger pump fitted , I added an auto bypass before zone valve and haven't heard anything back - so guess it's ok

 

[Deleted member 120897]

Good point. I really don't understand the system so maybe I got that wrong. Here is a picture of the arrow. Is that the only factor to ascertain its direction. Do I need to open it?

Valve seems in the correct orientation

 

[exedon2]

Is the small brass screw that locks the head down in place and tight?

 

[red_rover]

Valve seems in the correct orientation

Interesting. Is there a theoretical reason why an automatic bypass is needed and that gate valve is not enough?

 

[Chuck]

Interesting. Is there a theoretical reason why an automatic bypass is needed and that gate valve is not enough?

The ABV method is more energy-efficient than the always-open gate valve. This is because the gate valve (permanent) bypass raises the return temperature, which adversely affects heat recovery by condensing boilers.

 

[red_rover]

The ABV method is more energy-efficient than the always-open gate valve. This is because the gate valve (permanent) bypass raises the return temperature, which adversely affects heat recovery by condensing boilers.

Thanks. I will investigate further and ask a plumber to help with this.

 

[red_rover]

The ABV method is more energy-efficient than the always-open gate valve. This is because the gate valve (permanent) bypass raises the return temperature, which adversely affects heat recovery by condensing boilers.

Hi, I figured out that there is a radiator in the upstairs zone (none noisy zone) with no TRV, which i guess acts as a by pass. I guess I will end up getting an ABV anyway, and just have two.

 

[red_rover]

The ABV method is more energy-efficient than the always-open gate valve. This is because the gate valve (permanent) bypass raises the return temperature, which adversely affects heat recovery by condensing boilers.

It seems the bypass pipe with the current gate valve is just 15mm so I called the boiler company (Ideal) to ask is this ok or should it be 22mm. Id replace it to 22mm if needed when. But ideal refuse to advise as I am not gas registered.

 

[red_rover]

Hi all,

So I am preparing to fit the auto by pass. Just checking I m not muddled. Is it in the correct orientation with the arrow downwards?

 

[ShaunCorbs]

Yes