A replacement Mid-position motorised zone valve actuator designed for controlling the flow of central heating or hot water in 'Y plan' central heating systems. This valve operates in conjunction with inputs from a room or cylinder thermostat, opening only when demanded by the thermostat. It features a geared synchronous motor for opening and a spring return mechanism for closing. When the valve is open, a limit switch activates the heat source, regulating flow for both hot water and central heating simultaneously. Installation must follow the direction of flow indicated by the arrow on the valve body. It is suitable for open vented or sealed pumped systems and includes a 1-meter, 5-core colour-coded flexible cable for easy installation. The unit consumes 6W, operates within a temperature range of 5°C to 88°C, and has a maximum differential pressure of 1 Bar. The synchronous motor in this replacement actuator is replaceable.