公开(公告)号：US3334789A

公开(公告)日：1967-08-08

申请号：US55447166

申请日：1966-06-01

Applicant: CLACK CORP

Inventor： CLIFFORD KAY ,  NYGREN CHARLES E

IPC: C02F1/68

CPC classification number: C02F1/686

公开(公告)号：US3578167A

公开(公告)日：1971-05-11

申请号：US3578167D

申请日：1968-11-19

Applicant: CLACK CORP

Inventor： CLACK WILLIS E ,  NYGREN CHARLES E

IPC: B01D35/12 ,  B01J47/02 ,  C02F1/42 ,  B01D29/08

CPC classification number: B01D35/12 ,  B01J47/026 ,  C02F1/42

Abstract: A pair of water conditioning tanks each having a service port. The service ports are connected to each other and to a service outlet conduit. A pair of semibalanced, direct-acting control valves are provided, each having an inlet port, a tank port connected to one of the conditioning tanks, and a drain port. Each valve has a pressure responsive piston engaging the valve stem and a conduit for supplying line pressure to the piston to assist in operating the valve. Timed motor operators alternately maintain one of the valves in service position and the other in backwash position whereby each tank can be backwashed with conditioned water from the other.