Pressure relief valve, which is also called pressure relief relay. These valves are used in the system to remove the liquid from the transformer if the pressure inside the tank increases. This valve is used in power transformers and distribution transformers, both hermetic and with expansion source.

This product prevents the tank from exploding or changing its appearance. Keep in mind that pressure increase is between 0.3bar and 0.7bar depending on the design.

This valve is available from various reputable brands and there are two types of pressure relief valves:

Non-contact valves
Contact valves