Pressure Reducing Valve randomly cutting off flow

[cmat100]

Hi All,

I recently had an conversion from a vented system to closed with combi-boiler.

The shower was previously gravity-fed via a pump on hot and cold. The cold was backflowing into the hot so the plumbers fitted a reducing valve on cold supply to shower.

The reducer randomly drops to 0 BAR, cutting off the supply - I got a bit burnt in the shower. There seems to be no pattern to it. When it's supplying cold OK turning on a cold or hot tap makes no difference (I suspected incoming pressure).

If anybody could point me in the right direction it would save me quite a bit of hair!!!

Regards,

Mat.

 

[hazetimesfive]

remove the pressure reducing valve

 

[cmat100]

I suspect the final solution is to remove reducer and replace shower mixer. Just removing it would leave me with luke-warm hot water.

However the plumbers probably think I'm making this up. It worked fine when they left it.

Could hot backflow to cold confuse reducer? It's wound fully anti-clockwise.

 

[hazetimesfive]

is all your water mains pressure now? both hot and cold? i dont understand what the reducing valve is doing

 

[hazetimesfive]

is all your water mains pressure now? both hot and cold? i dont understand what the reducing valve is doing

 

[cmat100]

Cold is mains pressure now - Hot is mains via combi. Shower-pump removed.

 

[gigz]

Just remove it and link the pipework through, youre risking a scalding every time you use it.

 

[cmat100]

Thanks for the confirmation guys I'll do that. I'm really curious as to why it's doing that - could it be a faulty valve / pressure problems....!?