Pressure Relief Valve — YSF Series
Spring-loaded, rapid-opening valve mounted on the transformer tank. When internal pressure exceeds the set value — during an internal fault or oil overpressure — the valve opens within milliseconds to discharge oil and gas, then reseals automatically.
- YSF5(6.8)-25KJ
- YSF5(6.8)-35KJ
- YSF5(6.8)-50KJ
- YSF5(6.8)-80KJD
- YSF5(6.8)-130KJD
* Values marked TBD are confirmed per order against factory datasheets. KJD = with directional oil guide (spray deflector).
Technical Data
| Model | Size code | Oil guide |
|---|---|---|
| YSF5(6.8)-25KJ | 25 | — |
| YSF5(6.8)-35KJ | 35 | — |
| YSF5(6.8)-50KJ | 50 | — |
| YSF5(6.8)-80KJD | 80 | Yes (D) |
| YSF5(6.8)-130KJD | 130 | Yes (D) |
| Opening pressure setting / flange dims / contact capacity | TBD* — per order, dimensional chart PDF on request | |
* To be confirmed per order. Opening pressure must match your transformer's tank design — send us the nameplate data.
Frequently Asked
How do I choose the opening pressure?
It is set according to the tank's withstand pressure — usually specified by the transformer manufacturer. Tell us the transformer model or nameplate data and we will confirm the correct setting with the factory.
Does the valve need maintenance after operation?
The valve reseals automatically after discharge, but any operation should be investigated. We supply replacement gaskets and full valve units.
Need a specific opening pressure?
Send the transformer nameplate — we confirm the setting and quote within 24 hours.