ACTREG ASR 40 FO4 AFC S14 – Spring Return Pneumatic Quarter-Turn Actuator (Fail Closed)
The ACTREG ASR 40 is a compact, industrial rack & pinion pneumatic actuator designed to automate 90° quarter-turn valves such as ball and butterfly valves. In AFC (Fail Closed) spring return configuration, the actuator drives the valve to the safe (closed) position on loss of air supply, making it ideal for emergency isolation and shut-off duties in fuel handling, tanker equipment and general process systems.
Key features
- Fail-safe spring return (Fail Closed) – closes the valve automatically on air failure.
- Rack & pinion mechanism – reliable, repeatable quarter-turn performance.
- ISO 5211 / DIN 3337 valve mounting for straightforward installation and interchangeability.
- NAMUR accessory interface for direct mounting of solenoid valves and control accessories (VDI/VDE 3845).
- Adjustable end stops for accurate end-position setting (typical 90° with fine adjustment).
- Durable construction – aluminium body with protective finishes and engineered bearing surfaces for long service life.
FO4 / S14 configuration
- FO4: Output drive / mounting variant used to match specific valve stems and bracket standards (confirm suitability for your valve).
- S14 spring set: Higher spring return torque option for dependable fail-safe closure and improved seating margin.
Typical specification (platform level)
- Actuation type: Pneumatic, spring return (single-acting)
- Rotation: 90° quarter-turn (adjustable end stops)
- Maximum working pressure: up to 8 bar
- Interfaces: ISO 5211 / DIN 3337 valve mounting; NAMUR (VDI/VDE 3845) for solenoid/accessories
- Seal options: Available for standard, low-temperature and high-temperature duties (depending on build)
Selection guidance: always size the actuator against the valve’s required break/seat torque (including an appropriate safety factor) and confirm the required fail-safe direction (Fail Closed) prior to installation.
Need help matching the FO4 output to your valve? Contact us with your valve make/model and stem dimensions and we will confirm compatibility before supply.