Filling Loop Double Check Valve

[Triumph1]

I’ve noticed on my old Bosch boiler the DCV on the filling loop is fitted to the boiler side of the water supply.

And there is no isolator valve fitted. The only thing stopping it from leaking is the DCV?

IS this ok?

 

[Deleted member 120897]

It’s not the best, as the double check valve should be on the potable (drinking) water supply. Providing there is no issue with back flow, and the loop is removed, then it’s ok.

 

[Triumph1]

The filling loop is partly disconnected, it's still connected to the boiler side but not to the mains supply (so I don’t lose it!)

Would fitting another DCV on the mains supply after the isolation valve be worthwhile?

 

[Deleted member 120897]

Would fitting another DCV on the mains supply after the isolation valve be worthwhile?

It wouldn’t do any harm, but as I said, providing no backflow issues, then not a problem.

 

[Triumph1]

It wouldn’t do any harm, but as I said, providing no backflow issues, then not a problem.

Thank you

I presume there are no backflow issues as the DCV seems to be working as its not leaking.