trv
- Thread starter J1
- Start date
J1 said:what is the difference between a dual trv and a bi directional trv
Never heard of a dual trv. Bi-directional means that the water can flow either way through it without causing water hammer when the valve is shutting. Older valves could only have wter flow going one way so you had to know which was flow and return on each radiator.
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