How Tom connect new rads in loft conversion back to existing system ?

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Hello. New here and this is my first post.
I have almost completed a loft conversion in my own home. All pipework and rads are in place. Soon I need to connect up my new plumbing to the existing flow and return pipe stubs ends coming up from downstairs.

My question is :
How do I get the pressure out of the existing system, in order that I can remove the speed fit stop ends currently on the flow and return pipes ?
I do not want to drain down the whole system - just remove enough pressure so as to stop getting my hands wet up in the new loft. !
Advice would be gratefully received !
 
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First of all, you need to tell us what type of system you have, and how it is pressurised. Is the boiler fed from a storage tank. Something like this:

shopping


Or is it a system boiler that has to be pressurised manually by opening a valve and watching a dial / display until the operating pressure is reached, something like this:

images
 
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Thanks Stem. It's the second pic. A Combi boiler. - A Glowworm. Meant to state that in the original post.
 
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Isolate an upstairs rad or towel rail.
Put a tray or rubble sack underneath one of the valves.
Crack the union nut or 1/2" nut that goes from valve to rad/rail.
Allow rad water to dribble into tray or bag. Tightening nut back up and emptying full tray or bag into a bucket.
When rad empty, tighten nut and open valve - water from rest of system will flow in and reduce system pressure.

Or you can use a downstairs draincock (if present) to remove a bucket or two of water!

Or use the drain valve on the boiler.
 
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