Megaflow PRV 'squealing'

[JackRegan]

Hey ..

Megaflow tank, installation is circa 15 years old.

Every 1-2 months, when the hot water timer kicks in, I will get a high pitch squeal from the pressure reducing valve. Lasts for 10-15 mins. The only way to clear this for any length of time seems to be running through the megaflow bubble recharge process.

My guess is the PRV is starting to fail ? .. Any advice welcome and no I wont be going anywhere near it for DIY. Just looking for an educated answer before getting someone in.

Thanks for looking

 

[Whitespirit66]

I don't know about unvented.

Like the user name though. You're nicked!!

 

[Phill Peck]

Your cylinder and controls need to be checked/serviced

You'll find in the instructions that you should have a megaflo checked annually anyway to ensure all safety controls are working.
Very few people have this done

It may or may not need a new valve or cartridge. Sounds although its starting to fail as u suspect and letti the pressure get to high

Does the water at hot taps start at a higher pressure for a few seconds and reduce?

 

[JackRegan]

Pressure doesn't seem to fluctuate at all ..

The system has BG cover, I'm guessing your correct and the cylinder has never seen a service.

Time to call them ..

 

[Servotech]

If it's the (black) PRV valve that I'm thinking of then the top will easily unscrew from the base to reveal a filter (which will need a clean).

Wrap a little PTFE tape round the thread before you put it back though (bugger's for leaking)!

Don't forget to turn the water off first.

servotech,

 

[JackRegan]

Safe to do or should I just go with the call out ?

 

[Phill Peck]

The pressure reducing valve forms part of the safety controls and strictly speaking should not be touched by anyone not qualified to work on unvented cylinders (g3)

If you have BG cover use it
These cylinders can become bombs if the safety controls fail

 

[Phil Billington]

Your cylinder and controls need to be checked/serviced

You'll find in the instructions that you should have a megaflo checked annually anyway to ensure all safety controls are working.
Very few people have this done

It may or may not need a new valve or cartridge. Sounds although its starting to fail as u suspect and letti the pressure get to high

Does the water at hot taps start at a higher pressure for a few seconds and reduce?

Apologies, I know this thread is rather old but I notice these symptoms in my system. It's a Megaflo unvented indirect system which emits a squeal for 5-20 seconds periodically. It doesn't seem to be connected to the hot water schedule though but the pressure of water from the tap is frequently high for a few seconds before slowing down to normal.

Any recommendations?

Thanks,
Phil

 

[denso13]

Apologies, I know this thread is rather old

Seven years old! You need to start a new thread.