| 摘要 |
<p>A valve arrangement includes a valve housing that defines a product passageway and a valve seat within the product passageway. A valve wedge 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 are carried on the valve wedge, adjacent a guide track. Rollers are carried on the wings for rolling engagement with the tracks and scraper blades are carried on the wings adjacent the rollers to scrape contamination from tracks.</p> |
