Pressure Relief Valve (Prv) Suitable For 1578 Kva Bhel Transformer Used In Air-Conditioned E Mu Rakes. Make- Rajshi Model: Dp- 3 Ef-1 (With 1 No + 1 Nc Switch Contact, Nitrile Rubber Gaskets) Opera Ting Pressure (0.49 +/- 0.07Kg / Cm Sq) Or Its Equalent Approved By Rdso. [ Warranty Period: 30 Months After The Date Of Delivery ] ]