V.K. Valves Pvt. Ltd. Manufactures Fusible Plug with Replaceable Cone. V.K. Valves Pvt. Ltd. Is an ISO 9001:2000 awarded company The Fusible Plug with Replaceable Cone has Max. Steam Working Pressure of 17.58 kg/cm2g [250 psig.]. It has Hydraulic Test Pressure of 35.16 kg/cm2g [500 psig]. It also has Melting Temperature of Fusible alloy of 270 degree Celsius.