Caleffi Zone Valves

Alan (California Radiant) Forbes

I like the new o-ring seals vs. fiber washers.

HydronicMike

Pretty much everything is o rings now-boiler feed/bfp, mixing valves, etc.

mattmia2

i hate those fiber gaskets, i especially hated them when i had to cut one out of sheet gasket because i had to break the union and couldn't get the old one to seal and I didn't have a spare.

GroundUp

https://forum.heatinghelp.com/discussion/comment/1859977#Comment_1859977

Wait until you have to make your own o-ring. You'll miss the fiber gasket

mattmia2

that is where the majority of the telflon tape that i buy goes.

RascalOrnery

Does any supplier make a multi zone manifold like block? Or is every zone valve sold as individual?

The Steam Whisperer

I've got some Calleffi's running low pressure steam and have been quite reliable ( they make a higher temperature rated valve than the standard hot water models). Much more reliable than the outrageously priced multi piece commercial Honeywell zone valves on the same system that now, after being repaired twice over the same number of years, are getting replaced (with Johnson controls valves, Calleffi's can't handle larger steam loads).

hot_rod

you can assemble an o ring kit for spares. Spare o ring part numbers are in the catalog

This kit, 12 o rings covers everything from 1/2- 2”