Accessories for Oil Transformers
Pressure Safety Valves Type V
Pressure Safety Valves are used to prevent the rapid build-up of pressure within the transformer tank that might cause an explosion hazard. They are designed to operate and discharge any pressure greater than their set value to the atmosphere. These types are suitable for hermetically sealed type transformers.
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Construction
This valve type consist of a flange with a central hub with a spoked wheel. The hub supports and guides a steel shaft that is attached to a steel disc. The disc is held under pressure with a specially calibrated spring around the shaft. The external surfaces are protected against all climatic conditions. Steel parts are nickel plated. Hence the valves are suitable for operating in temperatures between -25°C and +100°C. Valves can be calibrated to operate any pressure between 0.3 and 0.7 bar.
Operation
When the internal pressure exceeds the calibrated level, the spring compresses and the valve opens. When the pressure reduces the force on the spring closes the valve. The valve is forced fully open by a pressure 40% greater than the calibration value.
Installation
Our valves are available in 2 sizes according to their discharge areas and are selected according to the transformer oil volume as follows:
Transformer Oil Volume (dm³):
- Up to 3000: V-50
- Up to 9000: V-80
For higher volumes of oil, two or more valves should be used. It is recommended to use two or more valves of smaller section than one valve of larger section. Valves can be positioned at critical points above a winding where the pressure effect is more acute during a short circuit. To ensure correct operation of the valve, any trapped air should be bled via the screw provided so that the oil is in direct contact with the disc.
Suitable for this
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