Changing trv without drain down

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Is it possible to change a trv on an upstairs radiator. Without draining the system. Without causing a flood.
 
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Don't open the bleed valve on the rad. Shut the locksheild off. Take the pressure out of the system. Then swap the valve? It should airlock?
 
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Don't open the bleed valve on the rad. Shut the locksheild off. Take the pressure out of the system. Then swap the valve? It should airlock?
Surely only on a sealed system, not open vented?
 
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