Water Boiler Pressure Relief Valve Leaking

If a pressure relief valve for a boiler is accidentally installed on a water heater it will leak like crazy from the start.

Water boiler pressure relief valve leaking.

A typical cause is the cold pressure of the boiler water system is higher than the setpoint of the expansion tank which are typically designed with a 12psi setpoint. This will allow your pressure relief valve to be opened up so that it will have a chance to drain the water out of your tank. If the temperature and pressure within the boiler are in the normal range and the pressure relief valve is leaking it is a sign the valve is defective. These valves may look identical but they re set to go off at 30 psi.

From there the valve that is at the very bottom will need to be opened up. Another culprit that can cause the pressure to rise and open the relief valve is if the boiler has an indirect water which uses the boiler water to heat the domestic water using a water to water heat exchanger. It s a very important part of your heating system. You will first need to get your cold water cut of valve closed before you begin to do any work for your water heater.

The boiler pressure relief valve is designed to leak water as a safety protection feature to prevent damaging your appliances. Some times the relief valve or blow off valve will leak and naturally people assume that it is because the relief valve is defective. If your system is leaking from the boiler pressure valve then it s best to check if the pressure is too high. Replace a defective leaking valve right away.

Extreme pressure within the system could cause the boiler or water lines to rupture. If it is allowing the pressure to reach 30psi or higher leaks can occur. The fill valve is defective. Special problems closed hot water system thermal.

To check if the fill valve is the problem turn the boiler off allow it to cool drain some of the water until the pressure reaches 10psi. A leaking heat exchanger could allow the higher city water pressure to enter the space heating side and increase the system pressure. To identify if you have an over pressure fault look at the gauge needle on your boiler it should be pointing in the green section set to around one bar. This pressure reducing valve is designed to allow only 12psi into the boiler.

Leaking of the pressure relief valve due to this condition is normally cyclical as the boiler temperature heats and cools. There are two potential causes for this circumstance.