Air Torque - Extruded Aluminium rack and pinion actuator, including 3-position 180°.
Electro less Nickel plating gives good reliability from a unit fully compliant with Namur interface. Max torque 4150NM.

Nationality: Italian

Rotork - Talking Electrics. No more to say.  If you have the budget, buy it!
Nationality: British

Quifer - Budget unit from Northern Spain once badged by top manufacture.
Does all that the competitors achieve without the cost. 180° and ductile iron help the range.
Nationality: Spanish

Hytork - British-made sturdy unit. Clever safety feature when removing spring pack for repair or overhaul. Great external coating from experience.
Nationality: British

Koei - The best quarter turn valve for the money I've seen. On/Off up to 1500NM or control @ 980NM. This Japanese Actuator is so simple to install with a nice manual override.
Nationality: Japanese

Bernard - Quarter Turn, Multi-Turn, IP 65 to EExd, local control. Yes pretty much everything in specifications.
Nationality: Italian