Proportional valve SCHAERER Spare Parts 3326920000

A proportional valve regulates the flow of water by adjusting its opening in direct response to an electrical signal. Instead of an on-off switch, the valve opens partially or fully, allowing precise control over the volume of water passing through. This method ensures consistent dosing for brewing, steaming or rinsing cycles in commercial coffee machines, where small variations in flow can affect taste and quality.

The operator sets the desired flow rate on the machine's control panel, which sends a 24 V DC signal to the valve. The valve's internal mechanism adjusts the opening proportionally to the signal strength, modulating the water flow without sudden changes. This gradual adjustment prevents pressure spikes and maintains steady extraction, which is critical for espresso and other coffee beverages.

To install the valve, the technician connects the inlet and outlet water lines to the corresponding ports, ensuring a secure fit to prevent leaks. Electrical connections are made to the 24 V DC terminals, matching polarity as specified in the machine's wiring diagram. Once installed, the valve operates automatically during the machine's programmed cycles, requiring no manual intervention during use.

The valve is designed for compatibility with SCHAERER coffee machines, where it replaces the original proportional valve to restore precise water flow control. Its role is specific to machines that rely on proportional flow modulation rather than fixed-volume dosing systems.

Cleaning and maintenance involve periodic inspection of the valve and its connections for leaks or mineral build-up. If scaling occurs, the valve can be removed and soaked in a descaling solution, following the manufacturer's guidelines for the coffee machine. Regular maintenance ensures the valve continues to respond accurately to electrical signals, preserving the consistency of water flow.

This spare part is listed in the coffee machine components section of the catalogue, under proportional valves for SCHAERER equipment.