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changing radiator valve

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boy01zone

Joined
27 Feb 2010
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Location
Worcestershire
Country
United Kingdom
I'm trying to change a rad valve without draining the system.
I've tried using a Drayton easy drain bung, sealing the header tank and back fill pipe, turning the opposite end rad valve off, and CH turned off, but when I open the valve in question water just flows fast.

I would appreciate any advise
 
how long did you let it flow for ? useally get about 1/4 pint before it stops.
 

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