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The actuator is a Drayton and it says on it Actuator Code ZA6 if that helps. As for what it does, I was hoping someone would tell me! The switch on the side slides from A to B whenever the heating comes on and from B to A (with a thump) when it goes off, so I guess it diverts the hot water...

I have a pressurised central heating system and every time it turns off because it has reached temperature there is a loud thump noise. I have traced this noise to the zone valve actuator in the airing cupboard. It first makes a whirring noise as the switch travels from A to B, then the thump...