The boiler pressure relief valve is a safety valve designed to relieved an excessive build up of pressure inside the boiler. The is a pressure vessel designed to handle a safe amount of pressure. If the pressure were to build up beyond the safety limitations as set forth by the design specifications the boiler system needs a safe way to vent the pressure to prevent an explosion. The boiler relief valve is this safe way to vent excessive dangerous pressures inside the boiler.

Boiler Pressure Relief Valve

Boiler Pressure Relief Valve - Boiler Safety
This pressure safety relief valve is piped into a nipple on the side of a Burnham boiler. The relief valve also is piped to a drain so if the relief valve were to relieve or let go it would vent all the hot water to safe place away from people or electrical circuits. As part of a preventive maintenance plan these valves should be checked for seeping or dripping. Any safety relief valve found dripping or seeping should be replaced. Most residential and light commercial hot water boilers have safety relief valves that will vent at 30 psi.

In the old days some boilers did not have any pressure relief valves installed on the boiler and it was not uncommon for the system to build up pressure and an explosion occur typically sending the boiler through the roof of the house. Insurance companies got tired of paying the cost associated with these explosions and thereby decided to implement safety requirements as recommended by industry professionals and engineers involved in boiler safety issues. As these changes were made some of these requirements were added to the mechanical and boiler codes for various states and municipalities. It is now in the mechanical code that a boiler be required to have a safety pressure relief valve to prevent too much pressure from building up in the pressure vessel whether it is steam or hot water.

You can learn more on boilers and HVAC here.

Boiler Pressure Relief Valve

High Performance HVAC

Boiler Pressure Relief Valve – Boiler Safety

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