MSR045
Single-Acting Quarter-Turn Pneumatic Actuator
Design Features
The MSR045 is the single-acting (spring-return) version of MILLER's MS Series pneumatic actuators. Powered by compressed air, it delivers a 90° stroke through a piston-and-rack-and-pinion mechanism. When the air supply is interrupted, the spring pack returns the valve to its preset position — a practical feature on pipelines that require spring-return on air failure.
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| Product Name | Single-Acting Quarter-Turn Pneumatic Actuator |
| Product Model | MSR045 |
| Actuator Type | Single-acting (spring-return) |
| Air Supply Pressure Range | 4.5–8.0 bar (65–116 psi) |
| Output Torque | 8.2–16.8 N·m (73–149 in·lb) |
| Travel Adjustment Range | ±5° (dual independent travel stops) |
| Number of Springs | 10 |
| Seals | NBR (standard); high- or low-temperature options available |
| Output Shaft Standard | NAMUR, ISO 5211, DIN 3337 |
| Top Accessory Interface | VDI/VDE 3845 (NAMUR) — accepts limit switches and positioners |
| Air Port Connection | NAMUR standard (NAMUR solenoid valve direct-mount) |
| Fasteners | Stainless steel |
| Remarks | Other special sealing materials or special temperature requirements can also be designed and selected according to customer specifications. |