| Size of valve actuator | 90 | ||
| Swivel angle | 90 deg | ||
| End-position adjustment range at nominal swivel angle | 81 deg ... 91 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 | 2,8 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 | 3 - high corrosion stress | ||
| Note on torque | The operating torque of the actuator must not be higher than the maximum permissible torque listed in ISO 5211, with reference to the size of the mounting flange and of the coupling. | ||
| Spring return torque at 50° swivel angle | 22,5 Nm | ||
| Spring strength | 1 | ||
| Product weight | 5.000 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 | ||
| End-position adjustment range at 0° | -1 deg ... 9 deg | ||
| Shaft connection depth | 24,8 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 | 2,8 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 | -20°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 | ||
| Spring return torque at 0° swivel angle | 30 Nm | ||
| Spring return torque at 90° swivel angle | 45 Nm | ||
| Air consumption at 0.6 MPa (6 bar, 87 psi) per cycle 0°-nominal swivel angle-0° | 3,85 l | ||
| Shaft connection | T22 | ||
| Note on materials | RoHS-compliant | ||
| Material seals | FPM NBR PUR | ||
| Material screws | High-alloy steel | ||
| Material number shaft | 1,43 |
