Pressure Reducing Valve

[Jamiealex12]

I have a pressure system in my house which is at 4bar. When the shower in my main bathroom is operational the needle on the pressure pot goes to zero. The shower is fed by 2 22mm pipes and is very powerful but if anyone runs water elsewhere-toilet flushing, dishwasher etc- it alters the flow to the shower. If I get pressure reducing valves to the hot and cold feed of the shower and set them to 2bar would that release 2 bar for other functions in the house preventing these fluctuations.

 

[PlumbBobBob]

no because the rest of the house is still at 4bar, the shower will still be affected. you will just have to tell everyone to not use any water outlets while showers are being taken.

 

[Jamiealex12]

Is that a common problem with a unvented system as apposed to a opened pumped system??

 

[diamondgas]

I have a pressure system in my house which is at 4bar.

I'm wondering whether you're talking 4bar working or standing pressure? Check out the flow rate of your cold water mains supply. It's quantity not pressure you really need to have enough of in any home. It sound like you may not have enough supply in your home to satisfy demand. Make sure your main isolation valve is fully open and you're getting plenty water through your main supply!

 

[PlumbBobBob]

it shouldn't be. maybe needs looking at by a plumber qualified in unvented cylinders. hot as you say is at 4bar should be at that rate over all system even when more than tap is open at once.

 

[Jamiealex12]

The standing pressure is 4bar but when the hot water is on the pressure goes to zero I guess that is the problem.

I had a new cold main service pipe installed 2 years ago (blue plastic pic) so I should have the quantity to deal with the demand.

 

[diamondgas]

The standing pressure is 4bar but when the hot water is on the pressure goes to zero I guess that is the problem.

It certainly sounds like there's an issue with supply. Does the same happen with cold only? Can you run a couple together or do they effect each other? Where is the pressure gauge you're reading? Does this also happen on other hot draw-off taps? More questions than answers....lol

 

[WHPES]

What is your blue pipe connected onto. Could it be onto an old steel pipe which has a reduced bore down to corrosion. You need to get a plumber with a flow cup and pressure gauge to test it as it sounds like a supply problem.