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Bump Can no one really answer this as I don't want to install a new actuator just to have it broken by an over stiff valve?

I have a Satchwell SM3203 (motor open/motor close) 2 port zone valve controlling the flow to the hot water cylinder which has stopped working. I've removed the actuator and found that when triggering it via the cylinder thermostat it starts to turn but then stops and clicks and won't turn the...