Transformer Pressure Safety Valves

The pressure safety valve is employed as a safety element in distribution transformers of low rating. In the event of an explosion-type pressure increase of the transformer tank, the excess pressure must be relieved immediately in order to avoid damage to the tank.These types are suitable for hermetically sealed type  transformers.

CONSTRUCTION

The pressure safety valve consists of a brass cap, a conical valve body, a rubber seal between the cap and body and a coil spring holding the whole system. As soon as relief pressure is reached, the valve cap lifts off and the excess pressure is relieved. The valve then shuts itself down again automatically. The valve can be infinitely set from 0.2 to 0.7 bar. The valve can also be equipped with a specially manufactured  protective cap to prevent unauthorized operation of valve.