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 (3, 11) to said at least one recovery section, said line comprising at least one intercepting member (112, 113) suitable for depressurizing said aqueous solution with formation of a two-phase flow (4, 13); wherein said at least one recovery section (MP, LP) comprises: a separator (104, 108) which receives said two-phase flow (4, 13) and separates the gaseous phase from the liquid phase, producing a first gaseous stream (5, 14) containing ammonia and carbon dioxide, and a liquid stream (6, 15) containing water, urea and ammonium carbamate; a pre-decomposer (105, 109) which receives said liquid stream (6, 15) from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent (10, 19) containing residual ammonium carbamate; a decomposer (106, 110) which receives the effluent (10, 19) of said pre-decomposer (105, 109) and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream (12, 18) containing ammonia and carbon dioxide and an aqueous solution containing urea (11, 17); a condenser (107, 111), wherein said first gaseous stream (5, 14) and said second gaseous stream (12, 18) 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 (3, 11) to said at least one recovery section, said line comprising at least one intercepting member (112, 113) suitable for depressurizing said aqueous solution with formation of a two-phase flow (4, 13); wherein said at least one recovery section (MP, LP) comprises: a separator (104, 108) which receives said two-phase flow (4, 13) and separates the gaseous phase from the liquid phase, producing a first gaseous stream (5, 14) containing ammonia and carbon dioxide, and a liquid stream (6, 15) containing water, urea and ammonium carbamate; a pre-decomposer (105, 109) which receives said liquid stream (6, 15) from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent (10, 19) containing residual ammonium carbamate; a decomposer (106, 110) which receives the effluent (10, 19) of said pre-decomposer (105, 109) and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream (12, 18) containing ammonia and carbon dioxide and an aqueous solution containing urea (11, 17); a condenser (107, 111), wherein said first gaseous stream (5, 14) and said second gaseous stream (12, 18) are at least partially condensed. a separator (104, 108) which receives said two-phase flow (4, 13) and separates the gaseous phase from the liquid phase, producing a first gaseous stream (5, 14) containing ammonia and carbon dioxide, and a liquid stream (6, 15) containing water, urea and ammonium carbamate; a pre-decomposer (105, 109) which receives said liquid stream (6, 15) from the separator and wherein at least a part of the ammonium carbamate is decomposed, obtaining an effluent (10, 19) containing residual ammonium carbamate; a decomposer (106, 110) which receives the effluent (10, 19) of said pre-decomposer (105, 109) and wherein at least a part of the residual ammonium carbamate is decomposed to provide a second gaseous stream (12, 18) containing ammonia and carbon dioxide and an aqueous solution containing urea (11, 17); a condenser (107, 111), wherein said first gaseous stream (5, 14) and said second gaseous stream (12, 18) are at least partially condensed.