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how can I replace a thermostatic radiator valve ?

how can I replace a 15mm thermostatic radiator valve on the top of a radiator with the old top cover part missing but with existing pin still screwed on and in place, without draining system as is in large commmercial premesis?
m.moody, September 2008
is it an open vented system ?

hi-spec plumbing & heating (essex), September 2008