Used Valve Grinding Machines. Only on The Ultimate Tooling you can find used valve grinding machines for engine workshops. Go to products. Valve grinders such as used Berco RV20, used Comec RV516, used KwikWay SVS II Deluxe, used PEG RV 3000 and much more from the best brands including AZ and Rottler. The section of used valve refacing machines is .