In 1987, Monica Valvik - Valen first time Norwegian champion on the road, and indeed in the Junior Women. Five years later, in 1992, she won in a year, two national titles, in the road race and the time trial. They also won in the same year the Swedish cycling Tygrikescupen; these three successes they could repeat the following year. Overall, it was eleven times Norwegian Champion. She also participated in two Olympic Games; in the road race at the Olympic Games in Barcelona in 1992 she placed fifth. They specialized in tours; they won the 2000 Tour de Bretagne.
1994 won Monica Valvik - Valen the world title on the road in the Italian Agrigento. Subsequently, she was honored in their home country with the foundation - Morgenbladet gold medal.
She was married to the Norwegian discus thrower Svein Inge Valvik. Her sister is the cyclist Anita Valen de Vries; the cyclist Gerrit de Vries is her brother.