VALVE DEVICE FOR AUTOMATIC CIRCULATION IN WASTE WATER PUMP STATION

摘要

The pressure side of a submersible pump unit isprovided with a valve device which during certain periods ofoperation opens a connection between the submersible pumpand the pump station to obtain the necessary circulation ofthe waste water in the station. The opening and closing ofthe salve device is effected by a ball which is controlledby the submersible pump pressure.