It is possible to separate completely the fluid region from the pneumatic area (control air chamber) through the compound PTFE membrane developed by Reiter. Thus, the contact with air is prevented. This has especially with isocyanate hardeners an immense effect on the service life of the valve.
Even with stock paint valves and 1C materials this clear separation prevents any colour without carryover effect on cleanability.
To retrofit the new valve generation in existing colour blocks is possible without any problems.