He was selected 108th overall in the
1987 NHL entry draft. Valk had a ten-year NHL career, debuting with the
Vancouver Canucks in the
1990–91 season, scoring ten goals and eleven assists for twenty-one points, while recording sixty-seven penalty minutes. Valk's strongest career year came in
1993–94, when he recorded forty-five points in seventy-eight games for the
Mighty Ducks of Anaheim, after being selected in the NHL's
expansion draft. Arguably his best work came in the late 1990s, when he was signed as a free agent by the
Toronto Maple Leafs. Valk became a player-coach that
Pat Quinn depended on, fighting off opponents in crucial situations while also being an offensive threat. Career highlights for Valk include the
1998–1999 playoffs, when he scored a key overtime goal to lift the Toronto Maple Leafs over the Pittsburgh Penguins in the second round of the NHL playoffs. Valk finished his career with a brief stint in 2003 with the
Chicago Blackhawks. ==Post-playing career==