Spring friction piston SCHAERER Spare Parts 3370062622

A spring friction piston regulates the pressure applied during the coffee brewing cycle. Inside the brew group of a coffee machine, the piston moves against a calibrated spring. As the machine builds pressure, the spring compresses, creating resistance that ensures the water flows through the coffee grounds at a controlled rate. This steady pressure is what extracts the oils and flavours evenly, producing the characteristic crema and body of espresso. Without the spring's resistance, the water would pass too quickly, under-extracting the coffee and leaving a weak, thin shot.

The operator does not interact directly with the piston; it works automatically once the brew cycle begins. The piston is seated inside the brew group, where it remains until the cycle completes. When the machine releases pressure, the spring returns the piston to its resting position, ready for the next shot. Its role is continuous and mechanical, requiring no adjustment during normal operation.

Constructed as a spare part for SCHAERER coffee machines, this spring friction piston is manufactured to match the original specifications. It fits seamlessly into the designated brew group, maintaining the pressure profile the machine was designed to deliver. The piston's function is critical to consistency, ensuring each shot meets the expected extraction standard without variation between batches.

Cleaning and maintenance follow from the piston's location and material. Since it operates inside the brew group, it is exposed to coffee oils and residue. Regular descaling and cleaning of the brew group will prevent build-up that could interfere with the piston's movement or the spring's tension. The piston itself does not require separate cleaning beyond the routine maintenance of the brew group.

This spring friction piston is a direct replacement for the original part in SCHAERER coffee machines. It is listed under spare parts for brew group assemblies, ensuring compatibility with the models specified in the SCHAERER parts catalogue.