[raithatha]

There is a constant leak outside the house that I have traces to a blue topped valve. I believe it is a pressure relief valve. Do I have to replace the whole valve or can this be replaced?
How do I make sure that it is the valve and not the pressure that is at fault?

[massplumber2008]

Hi Raithatha:

First I need to know if this a pressure relief valve from a boiler or a temperature and pressure relief valve from a water heater? If from a water heater is this a gas or an electric water heater?

MARK

[speedball1]

And next we would like to know if you have,
1) a sprinkler system connected to the house service?
2) a check valve or backflow preventer installed out near the water meter,
3) a expansion tank installed on the cold water supply on the water heater?
Let's hear back from you. Regards, Tom

[raithatha]

Hi,

Thanks for your replies. The valveis on an ordinary central heating boiler which has an emersion coil to heat the water as an option (never used).

The property is a simple semi detached with no sprinklers. Not sure about a check valve or backflow preventer near the water meteer. I am not sure I would know one if I saw one! - sorry. There is an expansion tank installed. Does thid help?

[massplumber2008]

Raithatha...

All helped.. yes.

Are you familiar with your boiler system... the shutoffs, valves, vents, etc.

Is this a forced water boiler (pump present) or a steam bolier? Can you tell me what the PRESSURE reading is on the boiler? There should be a gauge at front, or on top of boiler.

This issue is either related to a defective fill valve (pressure regulator valve) or could just be the pressure relief valve itself.

Sorry for all the questions... but now that we know it is a boiler we are closer than we were before.

Answer questions...

MARK