A check valve that lets flow pass in one direction only and stops backflow in vacuum lines. It opens at a differential pressure of 7 mbar or more and connects with a KF40 flange. It comes in a vertical-mount type and a spring-loaded type that can be installed in any direction.
| Model | KF40CV80 (vertical), KF40CV80S (any direction) |
| End Connection | KF40 flange |
| Material | Body CF8M(316), seal FKM |
| Operating Temperature Range | -5 to 100 ℃ |
| Leak Rate | 1×10⁻⁵ mbar·l/s |
| Pressure Range | 1×10⁻⁴ mbar |
| Minimum Relief Pressure ΔP | 7 mbar |
| Peak Pumping Speed | 10000 L/min |
| Weight | 0.7 kg (KF40CV80), 0.75 kg (KF40CV80S) |