got to go with scatman on this one.
By-pass balancing valve
- Thread starter JAllen
- Start date
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I can't remember ever thinking you were wrong before, seco, but what has scattyman said that you agree with?
all i agree on is that i always fit a bypass even on a 3 port valve with say all but one rad with trv's as i have known numptys to shut the only rad without trv off.
I agree that it's good practice, although my personal preference is for an auto-bypass, but I still maintain that MANDATE was right to say that it isn't needed.
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If the bypass valve is installed as shown above, it is so that the flow through the boiler never drops below a specified rate. This usually applies to low water-content boilers. If a bypass valve is required to control the differential pressure in the radiator circuit, then it should be connected across the pump. See Danfoss AVDO Data Sheet.
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