| Size of valve actuator | 180 | ||
| Swivel angle | 92 deg | ||
| Note on end-position adjusting range | One end position optionally adjustable | ||
| Cushioning | No cushioning | ||
| Mode of operation | Single-acting | ||
| Position detection | Without | ||
| Symbol | 991.266 | ||
| Safety Integrity Level (SIL) | Up to SIL 2 High Demand mode To SIL 2 Low Demand mode | ||
| Operating pressure | 4,2 bar ... 8,4 bar | ||
| CE mark (see declaration of conformity) | To EU Explosion Protection Directive (ATEX) | ||
| Explosion protection | Zone 1 (ATEX) Zone 2 (ATEX) Zone 21 (ATEX) Zone 22 (ATEX) | ||
| ATEX category dust | II 2D | ||
| Explosion ignition protection type for dust | Ex h IIIC T85°C...T200°C Db X | ||
| Operating medium | Compressed air to ISO 8573-1:2010 [7:4:4] | ||
| Corrosion resistance class CRC | 2 - Moderate corrosion stress | ||
| Torque at nominal operating pressure and 0° swivel angle | 210 Nm | ||
| Torque at nominal operating pressure and 90° swivel angle | 165 Nm | ||
| Spring return torque at 50° swivel angle | 67,5 Nm | ||
| Spring strength | 3 | ||
| Product weight | 11.700 g | ||
| Pneumatic connection | G1/8 | ||
| Material cover | Wrought aluminium alloy | ||
| Material housing | Wrought aluminium alloy | ||
| Material shaft | High-alloy steel |
| Flange hole pattern | F07 F10 | ||
| Shaft connection depth | 24,3 mm | ||
| Fitting connection conforms to standard | ISO 5211 | ||
| Mounting position | optional | ||
| Design | Scotch yoke system | ||
| Closing direction | Closes to the right | ||
| Valve connection conforms to standard | VDI/VDE 3845 (NAMUR) | ||
| Supply pressure for spring strength | 4,2 bar | ||
| Nominal operating pressure | 5,6 bar | ||
| CE marking (see declaration of conformity) | To UK EX instructions | ||
| ATEX category gas | II 2G | ||
| Explosion ignition protection type for gas | Ex h IIC T6...T3 Gb X | ||
| Explosion ambient temperature | -50°C <= Ta <= +60°C | ||
| Note on operating and pilot medium | Lubricated operation possible (in which case lubricated operation will always be required) | ||
| Ambient temperature | -20 °C ... 80 °C | ||
| Torque at nominal operating pressure and 50° swivel angle | 112,5 Nm | ||
| Spring return torque at 0° swivel angle | 90 Nm | ||
| Spring return torque at 90° swivel angle | 135 Nm | ||
| Air consumption at 0.6 MPa (6 bar, 87 psi) per cycle 0°-nominal swivel angle-0° | 7 l | ||
| Shaft connection | T22 | ||
| Note on materials | RoHS-compliant | ||
| Material seals | FPM NBR PUR | ||
| Material screws | High-alloy steel | ||
| Material number shaft | 1,43 |
