Mechanical valve / Piston for Autentica

What is a mechanical valve / piston

A mechanical valve, or piston, is a moving component that controls the flow of water or steam inside the coffee machine. It opens and closes the path according to the current brewing phase, ensuring that water flows in the right direction at the right time and under the required pressure.

Signs of wear

When the piston or the valve's sealing surface loses precision due to wear, it shows up as water leaking outside its intended path, fluctuating pressure, insufficient crema on espresso, or a watery drink instead. Unusual sounds when switching functions are also common, as well as error messages related to pressure or flow.

When it's time for a replacement

A damaged valve puts extra strain on the other parts of the hydraulic circuit and can cause them to wear out faster. Timely replacement restores stable pressure, consistent coffee taste, and prevents larger water leaks inside the machine.

• Check whether water is leaking outside the usual spots
• Watch for changes in the strength or speed of the flow
• When choosing a replacement, check compatibility in the product table

Compatible with

• ETAM29.510.B Autentica
• ETAM29.510.SB Autentica
• ETAM29.620.SB Autentica Plus
• ETAM29.660.S Autentica Cappuccino
• ETAM29.660.SB Autentica Cappuccino
• ETAM29.666.S Autentica Cappuccino
• ETAM29.666.T Autentica Cappuccino
• ETAM36.365.MB PrimaDonna Xs
• ETAM36.366.MB PrimaDonna Xs
• ETAM29.510.WB Autentica
• ETAM36.365.MPrimaDonna Xs