A valve arrangement (10) includes a valve housing (12) that defines a product passageway (16) and a valve seat within the product passageway (16). A valve wedge (30) is disposed within the housing passageway, and moves along a direction of operation between a closed position and an open position. A pair of opposed wings (46, 48) are carried on the valve wedge (30), adjacent a guide track (56, 58). Rollers (62) are carried on the wings (46, 48) for rolling engagement with the tracks (56, 58) and scraper blades (70, 79) are carried on the wings (46, 48) adjacent the rollers (62) to scrape contamination from tracks (56, 58).