You are currently viewing Why Is My Boiler Boiler Strain Relief Valve Leaking?

Why Is My Boiler Boiler Strain Relief Valve Leaking?

Throughout a latest inspection water was dripping from the extension pipe on the aspect of the boiler on to the flooring. This piping was related to a leaking Stress Aid or Protection Valve. This rather prevalent challenge is in fact a rather good point and keeps you and your relatives harmless from possible failure of your boiler. In advance of the installation of these units it was not unheard of to hear about boiler explosions injuring home occupants.

But why is it leaking now? To answer this issue, it is critical to understand how your heating method functions. Your heating program distributes hot drinking water through your house. As the water is heated and cooled by the boiler that h2o expands and boosts in tension. In buy to limit the pressure of the heating method the hot water heating technique includes a variety of protection devices to make sure your home is harmless.

The 1st and most vital machine on your boiler is the Stress Reduction or Safety Valve. The regular working strain of a home boiler technique is 12 psi. If for any rationale the force of the boiler raises past the protected working tension (the setpoint of the Pressure Aid Valve) the valve will open up. This around pressurizing issue is probably caused by a failing expansion tank. When a boiler program does not let for sufficient thermal enlargement of the drinking water in the procedure, the strain of the technique increases further than the Force Reduction Valve setpoint. Leaking of the Tension Reduction Valve thanks to this ailment is usually cyclical as the boiler temperature heats and cools. There are two possible leads to for this circumstance.

A normal lead to is the chilly tension of the boiler h2o method is greater than the setpoint of the expansion tank which are generally designed with a 12psi setpoint. Even so, when the feed valve to the boiler method is greater than this setpoint the growth tank bladder is compressed in advance of the boiler commences procedure. When the boiler is turned on and the drinking water is heated, subsequent thermal expansion are not able to be accommodated by the already compressed bladder. Modification to the interior strain of the expansion tank and/or reduction of the force lowering valve setpoint could be required.

A second potential bring about is an actual leak or failure of the expansion tank bladder. In this situation the growth tank no more time gives for thermal expansion of the h2o in the method as the entire tank is stuffed with h2o.

Other leads to of leaking Force Relief Valve can be owing to the age and deterioration of the valve by itself. In that situation substitution of the valve is proposed. Perform really should often be carried out by a experienced plumbing contractor.


SAMI CONSTRUCTION is professional and client focused building contractors. Offering both domestic & commercial building and refurbishment services throughout Dublin.
Useful Links