Victoria arduino expansion valve piston gasket d12x4 red 02590012

What is a piston seal

A piston seal is a small rubber or silicone ring that closes off the space around the movable piston inside the coffee machine. It ensures that water or pressurized steam does not leak from the path it is meant to flow through, and it maintains the correct pressure needed to brew coffee.

When the part stops doing its job

When the seal hardens, cracks, or loses its elasticity, this shows up as water or steam leaking around the piston, a drop in pressure, uneven extraction, and a change in coffee taste. Sometimes you can hear hissing or see dripping in places that should stay dry.

Why you shouldn't put off the replacement

A worn seal puts extra strain on the surrounding parts of the mechanism, increases water or steam consumption, and can lead to unstable machine performance. Timely replacement prevents further wear on the piston and neighboring components and restores reliable operation of the coffee machine.

How to choose the right seal

• Check compatibility in the product table, as dimensions and shape vary between different machines.
• When replacing it, also inspect the condition of the piston so the new seal fits properly and lasts a long time.

Compatible with

• ADONIS (202206-)
• ATHENA-S