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Isolation valve flow limits?

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Scott_D

Scott_D

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I know it depends on pressure but is there a rule of thumb limit to the litres per minute that can pass through a cheap 15mm isolation valve?
 
Around 12-15lpm I would say
 
Low enough that it can fool a struggling old Combi into not coming on!
I have ‘mended’ boilers by swapping out valves to full bore on more than one occasion!
 

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