All FAMAT valves are based on our patented “EXPANDING PISTON TECHNOLOGY”.
The patented system allows a perfect tightness from vacuum up to 10 bar（145 psi） by the expansion of the PTFE coated piston.
The advantage of having an expandable piston inside the valve is to eliminate the need for O-ring that can be damaged during valve operation, and consequently generate contamination for production.
Another advantage is that in closed position, the piston make flush with the connection point, leaving no dead space.
- Chemical industry