Son of Carlos del Valle y Soldevilla (from Peru) and Carmen Moncada Rivera, he was born and raised at his maternal grandmother's house in the neighborhood La Ronda, close to the Metropolitan Cathedral and the City Hall.

Del Valle made his debut as a journalist in the pages of political newspapers such as, El chilío, Worker’s Voice, Alliance of Democratic Youth, among others.

Whitman, Neruda, Hikmet, Maples Arce and Spanish poets of the generation of 27 (after many efforts and failures) would help him endure the pain of losing his mother and to find his voice.

In May 1954 the great strike of the banana workers took place on the north coast of Honduras, Del valle was there, writing in verse and prose, next to the "wretched of the earth".

In 1957 he travelled to USSR, during the VI World Festival of Youth and Students for Peace and Friendship among People held in Moscow from July 28 to August 11.

On October 31, 1962, the political police broke into his home as a part of the repressive action of the government of Villeda Morales as a result of the US blockade against the island.