... below 200KZ,controllable or adjustable ac voltage system,specially used to improve induction heating, melting, mixing or casting device,and ... residual voltage≤10% Un when power on,entrance water pressure≤0.3MPa,entrance water temperature≤30°C,cooling water's ... sealing structure bently welded by aluminum plate,silicone rubber sealed,porcelain bushing supported wiring guide-bar and cooling pipe ...