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how can i fix worcester bosch oil heatslave 12/14 burner type B9A year 1997?

oil dribbles from nozzle when not in use. burner type has not got a mechanical shut off valve fitted as per latter models. dont know if nozzle has some kind of shut off valve (nozzle damfoss BB9 0.50 60ES 150kg/h)
ij simpole, February 2008
Behind the nozzle is normally a check valve. Is this the problem?
sorry if not.

Mr tryin2elp, February 2008
link Click here to see other fixes for Worcester.