Replacing a 3 port Motorised valve.

26 Apr 2006
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United Kingdom
about a year ago my 3 way motorised valve packed up (danfoss). It seized up. I replaced the actuator head only at the time because it was easier for me to do. Now the valve itself is leaking from behind the motor and it has corrosion behind the 3 way motor and the valve.
I have a gravity feed system. What do I have to do to change the whole valve and actuator head, do I have to drain the whole system down or should I be able to isolate it some how?
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