Pressure Relief Valve

Structure and working principle:
1. The main structural type of Pressure Relief Valve is external spring type, with or without directional guiding device. Its main components are composed of spring, valve seat, spring seat, valve housing (cover), marker rod, signal switch (occurrence box), sealing ring and other parts.
2. Working principle
When an accident occurs inside the Oil Immersed Transformer, the oil in the oil tank is vaporized, generating a large amount of gas, which makes the internal pressure of the oil tank rise sharply. If the pressure is not released in time, the fuel tank will be deformed or burst. The installation of the pressure relief valve means that when the pressure in the oil tank rises to the opening pressure of the pressure relief valve, the pressure relief valve opens rapidly within 2ms, making the pressure in the oil tank drop quickly. When the pressure drops to the closing pressure value of the pressure relief valve, the pressure relief valve is closed reliably, so that the positive pressure in the oil tank is always maintained, effectively preventing external air, moisture and other impurities from entering the oil tank; When the pressure relief valve is opened, the marker rod is in the direction of. The upper action and obvious extension of the top cover indicate that the pressure relief valve has been operated. When the pressure relief valve is closed, the marker rod remains at the position after opening, and then it can only be reset manually. Compared with the safety airway, it has the advantages of accurate and reliable movement, no damage to parts after movement, and no replacement.

purpose
● The product has electrical alarm signal, which can realize remote monitoring.
● Applicable to liquid or gas insulated transformers, transformers, on load tap changers, high-voltage switches and other electrical products.
● In case of internal failure of electrical equipment, the valve will open to release the pressure in the oil tank to avoid deformation and bursting of the oil tank.

● When the pressure in the oil tank drops to the closing pressure of the valve, the valve will be closed again to prevent external moisture and impurities from entering the tank.