Model AS4 is a heavy-duty, quarter-turn rotary spring return actuator for industrial valve and damper automation with fail-safe operation. It provides a startup torque of 600 in-lb (67.8 Nm) and an end torque of 400 in-lb (45.2 Nm), returning 90° in 2 seconds via spring after power loss. The actuator uses a permanent split capacitor motor with thermal overload protection, rated for 115, 208, or 230 Vac, and includes a power-on brake and snap-action SPDT limit switches rated at 15A @ 250Vac. It meets NEMA 4 standards with optional NEMA 4X, 7, and 9 enclosures and has a thermally bonded polyester powder coating. Mounting follows ISO 5211 F07 with a 0.66" square male drive. Weight is 68 lb (30.8 kg), operating temperature range is -40°F to 150°F (-40°C to 65.6°C), and duty cycle is 25%. Maximum cycles are 25 per day, with spring return reserved for emergency use only.
Model AS4 electric spring return actuator is a robust heavy-duty actuator recommended for systems requiring as many as 74 cycles per day (approximately 27,000 annually). Like model ES2 the operating cycle life of the actuator is drastically affected by the model of operation, power to open and close will provide for years of reliable performance. AS4 has a spring end torque of 400 lb·in with a closing speed of 3 sec./90 degrees upon loss of power. This actuator is ideally suited for ball valves and dampers with torque ratings of up to 300 lb·in.
Standard equipment includes 115Vac-1ph Continuous duty motor with thermal over load protection, set to fail closed (CW rotation) upon loss of power, two limit switches, power on brake, stainless steel fasteners, 300 series stainless steel output drive, polyester powder coating.
| Indelac Controls, Inc. | |
|---|---|
| Product Category | Electric Valve Actuators |
| Product Number | Model AS4 |
| Product Name | Spring Return Actuator |
| Valve Motion | Rotary |
| Operation | OnOff |
| Actuation Time | 12 seconds |
| Failsafe | CloseNoPower; OpenNoPower |
| Actuator Torque | 400 In-lbs (461 kg-cm) |
