A one-in-service, one-standby-system can be formed by two N74 machines and a three-way ball valve F80, with a flow rate of 10m/h.

How It works:

When the volume of outlet water is reduced to zero, the signal output connector will force the ball valve to change its position, while the other valve remains in service. In doing so, water continuously supplied.

The system can also be formed with control valves with a two inch diameter, including F77A3, F99A3, F95A3, and F111A3.