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Controlling the flow

The water level in the boiler needs to be allowed in only when required, and here is how that is achieved.
The water level in your main boiler is controlled via clever electronics and sensors that control an electrical gate.

Before advances in electrical control, the barista had to observe a glass level gauge, and then manually fill the boiler to the correct level using a lever, phew! thank heavens them days are gone.
Manufactures have a couple of options to control the filling circuit:

Inline Valve - great where space is at a premium and cost of construction needs to be kept down.

Block Mounted Valve - usually found on more higher end machines.
It is worth noting that between the 2 types of valves that there is no difference in the end result of how well the boiler is re-filled with fresh water. Both valves perform exactly the same function and both have the same durability in operation life.

How It Works

inline inlet valve

When the control circuit on the machine senses a low operating water level inside the boiler, a voltage is applied to the electrical coil on the solenoid .

The applied voltage then causes the shuttle inside the valve body to retract, which then allows water to flow through the solenoid and into the boiler.

Once the level in the boiler is at the correct set point, the voltage is removed and the shuttle returns to its closed state by the pressure from the spring mounted on the shuttle.

block mounted valve

Operation of the block mounted inlet valve is exactly the same as the inline valve above.

The advantage of using a block for the inlet, is that other components like pressure relief valves and boiler drain connections can also be incorporated into the block assembly.

When the control circuit on the machine senses a low operating water level inside the boiler, a voltage is applied to the electrical coil on the solenoid .

The applied voltage then causes the shuttle inside the valve body to retract, which then allows water to flow through the solenoid and into the boiler.

Once the level in the boiler is at the correct set point, the voltage is removed and the shuttle returns to its closed state by the pressure from the spring mounted on the shuttle.

This is Espressocare.

Coming soon will be self guiding help pages to assist in fault finding on your traditional espresso machine.
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