TRV

Mike T., Swampeast MO

Hot water and two-pipe steam use the same TRV bodies.

One-pipe steam TRV bodies actually replace the air vent as the internal passageways in the hot water/2PS bodies are far too small to let steam and condensate simultaneously travel in opposite directions.

The one-pipe steam TRV bodies <I>with an integral vacuum breaker</I> are HIGHLY recommended. Without the vacuum breaker when the steam "collapses" into condensate at the end of the cycle, air won't replace it in the rad, it will have sub-atmospheric pressure inside and condensate can back up.

Jim Pompetti

TRV's

Is there a difference ,hot water and steam