Model Number E69F-B12 Type Pneumatic Scotch-Yoke Rotary Piston Actuator Action Double-Acting (The "B" in the model code typically signifies this). Air pressure is required to move the piston in both directions (to open and to close). Rotation Angle 90° (standard quarter-turn). Mounting Standardized mounting per ISO 5211 to fit compatible quarter-turn valves. Performance Supply Air Pressure Standard Range: 40 - 120 psi (2.8 - 8.3 bar). Torque Output High Torque. Exact values (in lb-in, lb-ft, or Nm) are dependent on air supply pressure and the specific size "F". Consult the official Actuator Torque Table for precise figures. Spring Return Option The base "B" model is double-acting. A Spring Return Module (SRM) can often be added to provide fail-safe operation (fail-open, fail-closed). Physical & Environmental Manual Override Equipped with a manual handwheel for local operation during maintenance or air supply failure. Position Indicator Visual mechanical indicator showing "OPEN" and "CLOSED" positions. Operating Temperature Standard: -20°C to +82°C (-4°F to +180°F), with compatible lubricants. Accessory Ports Prepared for the mounting of accessories like limit switches, solenoid valves, and positioners.