Quick Mill Coffee Machine Expansion Valve (QM-OT0990VE) Maintain safe, consistent brew pressure in your Quick Mill espresso machine with this OEM replacement expansion valve. The expansion valve regulates excess pressure in the group head circuit, protecting your pump and boiler from over-pressurisation and ensuring stable extraction every shot. Specifications Part Number: QM-OT0990VE Type: Expansion Valve (OPV) Condition: New / OEM quality Vendor: Quick Mill Compatible Models Quick Mill Pappia Quick Mill QM67 Why Replace Your Expansion Valve? A worn or incorrectly set expansion valve causes over- or under-pressure at the group head, resulting in poor extraction, channelling, or pump strain. Replacing it restores factory pressure settings and protects your machine long-term. Installation Recommended for qualified technicians or experienced home baristas. Contact our team if you need guidance on the replacement process.