What Are Non-Return Valves (NRV) and How Do They Work - Weekly Boiler Tips

[@CarrotCaptain]

How often do the seats need to be rebuilt on these valves?

[@jwiereng]

Thanks again for a great video. Could you do a video (series) in the future about vacuum steam heating systems?

[@bigmike_palo8521]

is a nrv and stop valve the same thing? cant tell if guys in the field use different terminology or if theyre two seperate valves with their own respectable functions.

[@Jacob-oc2zx]

is there any reason to believe this valves ensures only dry steam passes through the system?

[@williec.1540]

THANKS!!!!!!

[@sedp13drewde84]

There's no spring ?