Valve closed by spring force in rest position - NC. When the actuator (cylinder) is pressurised the piston (spindle) is lifted of the seat (orifice) directly. Further function like normal open by spring force (NO) is also available. High temperature design up to +400°C with metallic seat sealing and static wills-ring.
| Version | 2/640- | |
| Type of valve | Seat Valve, pneum. direct | |
| Connection type, valve seat | 02 | DN20, 20mm |
| Kv-value (Δp = 1 bar H₂O) | 8 m³/h | |
| Housing | 08 | AISI 316 Ti - 1.4571(81) |
| Sealing | 00 | Metall/Wills® |
| Function | 8 | OPEN with spring |
| Design | 0 | straight seat, actuator aluminium |
| Actuator size | 08 | ⌀80 |
| Actuator volume | 260 cm³ | |
| Valve option | DT | distance unit with Wills® seals |
| System pressure | 0 - 16 bar | |
| Control pressure | 6 - 8 bar | |
| Temperature Medium | from -40 °C to +400 °C | |
| Temperature Environment | from -10 °C to +60 °C | |
| Mounting position | in any position | |
| Specific use case | Closed system (includes open system) |
| Valve option | DT | distance unit with Wills® seals |
| Description | High temperature version up to +400°C with metallic seat seal, static with Wills® seals. | leakage rate 3 | |
| REACH-RoHS conformity | REACH yes | RoHS yes | |
| Customs export | Country of origin Germany; ECCN (US): N; AL: N |
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