The Department of Water and Sanitation (DWS) has opened six valves at the Vaal Dam to gradually increase water outflows by another 200 cubic metres per second (mᵌ/s) and manage water levels. The ...

saving energy and handy operation etc. • The open torque is little and the valve can self compensate after wearing because of big chocking force. The seal performance is good and stable. • It can be ...