Plant for the synthesis of urea from ammonia and carbon dioxide, comprising: a section for the synthesis of urea from ammonia and carbon dioxide operating at a synthesis pressure; at least one recovery section (MP, LP) operating at a recovery pressure lower than said synthesis pressure; a line which supplies an aqueous solution containing urea to said at least one recovery section, said line comprising at least one intercepting member suitable for depressurizing said aqueous solution with formation of a two-phase flow ; wherein said at least one recovery section (MP, LP) comprises: a separator which receives said two-phase flow and separates the gaseous phase from the liquid phase, producing a first gaseous stream containing ammonia and carbon dioxide, and a liquid stream containing water, urea and ammonium carbamate; a pre-decomposer which receives said liquid stream from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent containing residual ammonium carbamate; a decomposer which receives the effluent of said pre-decomposer and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream containing ammonia and carbon dioxide and an aqueous solution containing urea ; a condenser , wherein said first gaseous stream and said second gaseous stream are at least partially condensed. a section for the synthesis of urea from ammonia and carbon dioxide operating at a synthesis pressure; at least one recovery section (MP, LP) operating at a recovery pressure lower than said synthesis pressure; a line which supplies an aqueous solution containing urea to said at least one recovery section, said line comprising at least one intercepting member suitable for depressurizing said aqueous solution with formation of a two-phase flow ; wherein said at least one recovery section (MP, LP) comprises: a separator which receives said two-phase flow and separates the gaseous phase from the liquid phase, producing a first gaseous stream containing ammonia and carbon dioxide, and a liquid stream containing water, urea and ammonium carbamate; a pre-decomposer which receives said liquid stream from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent containing residual ammonium carbamate; a decomposer which receives the effluent of said pre-decomposer and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream containing ammonia and carbon dioxide and an aqueous solution containing urea ; a condenser , wherein said first gaseous stream and said second gaseous stream are at least partially condensed. a separator which receives said two-phase flow and separates the gaseous phase from the liquid phase, producing a first gaseous stream containing ammonia and carbon dioxide, and a liquid stream containing water, urea and ammonium carbamate; a pre-decomposer which receives said liquid stream from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent containing residual ammonium carbamate; a decomposer which receives the effluent of said pre-decomposer and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream containing ammonia and carbon dioxide and an aqueous solution containing urea ; a condenser , wherein said first gaseous stream and said second gaseous stream are at least partially condensed. <EOS>