Ball Grinding Machine of Model QTMJ-250/400(Double
The ball grinding machine is specially designed and manufactured to becombined type with one small and one big working positions plus the accessories(1 set of cast-iron grinding plates and internal-expand type clamping fixturesfor grinding DN150-400(6"-16") balls of ball valves with the six sizes of DN150, DN200, DN250, DN300, DN350 and DN400, that is, the small grinding