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| Type code | VFOF |
| Valve function | Exhaust air flow control non-return function |
| Selection of additional function | Piloted check valve |
| Pneumatic connection 1 | QS-8 |
| Pneumatic connection 2 | G¼ |
| Actuation type | Manual |
| Pilot air port 21 | QS-8 |
| Adjusting element | Internal hexagon |
| Type of mounting | Screw-in |
| Standard nominal flow rate in flow control direction | 590 l/min |
| Standard nominal flow rate in non-return direction | 310 l/min ... 540 l/min |
| Operating pressure | 0.2 bar ... 10 bar |
| Pilot pressure | 2 bar ... 10 bar |
| Ambient temperature | -10 °C ... 60 °C |
| Housing material | PBT |
| Mounting position | Any |
| Actuation type, piloted non-return function | Pneumatic |
| Manual exhaust function | Non-detenting |
| Symbol | 00991958 |
| Rotatability | 360 deg/continuous swiveling not permissible |
| Operating pressure for entire temperature range | 0.2 bar ... 10 bar |
| Standard flow rate in flow control direction 6 -> 0 bar | 940 l/min |
| Standard flow rate in non-return direction at 6 -> 0 bar | 830 l/min ... 1000 l/min |
| Standard flow rate in non-return direction at 6 -> 0 bar unactuated | 840 l/min ... 1000 l/min |
| Standard nominal flow rate in non-return direction actuated | 315 l/min ... 540 l/min |
| Standard nominal flow rate in non-return direction, unactuated | 310 l/min ... 540 l/min |
| Switching time off | 11 ms |
| On switching time | 8 ms |
| Operating medium | Compressed air as per ISO 8573-1:2010 [7:4:4] |
| Information on operating and pilot media | Operation with oil lubrication possible (required for further use) |
| Temperature of medium | -10 °C ... 60 °C |
| Pilot medium | Compressed air as per ISO 8573-1:2010 [7:4:4] |
| Nominal tightening torque | 11 Nm |
| Tolerance for nominal tightening torque | ± 20% |
| Permissible actuation moment, adjusting screw | 1 Nm |
| Product weight | 73.9 g |
| Covering material | ES-BE |
| Note on materials | RoHS-compliant |
| Cover material | PBT |
| Seals material | NBR |
| Hollow bolt material | Wrought aluminum alloy |
| Sleeve material | Wrought aluminum alloy |
| Releasing ring material | POM |
| Material of adjusting screw | Brass |
