The MVB is a manual valve for high vacuum, opened and closed by turning a handle. It has an aluminum body and molded bellows and connects to vacuum or inert gas lines with NW16 to NW50 ports.
| Working Fluid | Vacuum and inert gas |
| Working Pressure | 1.3×10⁻⁶ to 1×10⁵ Pa(abs) |
| Max. Operating Pressure Differential | 0.1 MPa |
| Valve Seat Leakage | 1.3×10⁻¹⁰ Pa·m³/s (He) or less |
| External Leakage | 1.3×10⁻¹¹ Pa·m³/s (He) or less |
| Proof Pressure | 0.3 MPa |
| Fluid Temperature | 5 to 60 °C |
| Ambient Operating Temperature | 0 to 60 °C (no freezing) |
| Orifice Size | ø17 / ø24 / ø39 / ø48 mm |
| Port Size | NW16 / NW25 / NW40 / NW50 |
| Material | Body A6063, bellows SS316L |