Hammering or water spurt.

[PrenticeBoyofDerry]

So what is the best method to stop either water hammer or water spurting from the tap?
Just changed a gate valve for a stop tap on incoming cold water supply as I thought this would prevent water hammer on the HP supply.
But the hot water now seems to be spurting when turned on.
Why would that be?

 

[HERTS P&D]

Gate valves are for only low pressure not mains.

Is all the pipe work fixed and not moving?

Andy

 

[HERTS P&D]

Gat valves are for low pressure only and is the pipe work clipped and secure?

Or your pressure could be too high.
Quarter turn can cause water hammer if turned of to quickly.

Andy

 

[PrenticeBoyofDerry]

I know a gate valve is for LP water systems that is why I changed the gate valve to a stop tap.
I can't for sure say that everything is securely fixed/clipped as most of the pipe work is under the floorboards the wall mounted pipe work is clipped.
The spurting of the water was not apparent until the gate valve was swapped for the stop tap.
Don't understand quarter turn if turned on to quickly bit?
If the water pressure was to high, what would be the best way to resolve this problem?

 

[Charnwood]

You have fitted the stopcock the right way round, haven't you?

Water hammer will happen with any type of tap if turned off quickly, not just QTs.

If the water pressure was to high, what would be the best way to resolve this problem?

Pressure reducing valve.

 

[PrenticeBoyofDerry]

You have fitted the stopcock the right way round, haven't you?

I did yes, the directional arrow is pointing in to the property.

Pressure reducing valve.

If I Installed a PRV what would be the pressure that it should be set at, is this a standard pressure or will it depend on what the supply is serving, also will it affect the flow rate?
Could the spurting be cured by tap maintenance, such as jumper replacement?

 

[Charnwood]

Most PRVs come factory preset at 3 bar, which is a pretty good average, I'd have thought. Most are capable of taking up 25 bar inlet pressure, and are adjustable between 6 bar and 1 bar.

 

[PrenticeBoyofDerry]

So three bar is a fair pressure value then?

 

[Charnwood]

Average mains water pressure in the UK is - allegedly - 2 to 4 bar during the daytime, slightly less at peak usage times.