What is a pressure relief valve (PRV)?

A pressure relief valve (PRV) is a safety device designed to control or limit the pressure inside a system by automatically venting excess pressure when it exceeds a predetermined safe limit, thereby preventing equipment damage or failure.

Why are pressure relief valves used in transformers?

In oil-filled transformers, pressure relief valves prevent dangerous internal pressure buildup due to faults or rapid temperature changes. They quickly discharge excess pressure to protect the transformer tank from damage or explosion.

How does a pressure relief valve work?

A pressure relief valve stays closed during normal operation. When internal pressure rises above its set limit, the valve opens to release excess pressure and then closes again once the pressure returns to safe levels.

What are typical features of pressure relief valves?

Most pressure relief valves are spring-loaded and designed to open quickly at set pressure points. Some models include indicators or directional covers to manage the flow of released fluid or gas.

Where else are pressure relief valves used besides transformers?

Pressure relief valves are widely used in boilers, pressure vessels, industrial pipelines, tanks, compressors and other high-pressure systems to protect equipment and personnel from overpressure conditions.

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