Every espresso machine does have some sort of a water inlet valve. The Astoria brand has 2 types of water inlet valves.
The first water inlet valve, is the manual operated inlet valve and is available in various versions. The solenoid valve for automatic filling of the boiler is found separate in the espresso machine. You can find this model of water inlet valve on the Astoria Argenta/ Astoria Brava, Astoria Divina, Astoria Dora, Astoria Rapallo, Astoria Vania
The second model is the water inlet valve with a solenoid valve attachment on it. This type of model valve can also be found on various espresso machines of Vibiemme. On the Astoria espresso machine they can be found on the models such as the Astoria Forma, Astoria Pratic and the Astoria Tanya.