ALFACOM ENGINEERING LTD.
ALFAMATIC AMT Rack-and-Pinion Pneumatic Actuators
ALFAMATIC AMT twin-piston rack-and-pinion actuators operate quarter-turn valves, including ball and butterfly valves. Select the actuator from the valve torque, available air pressure and required operating configuration.
ALFAMATIC AMT Rack-and-Pinion Pneumatic Actuators · ALFACOM catalogue
Double-Acting or Spring-Return Operation
In a double-acting actuator, compressed air drives both opening and closing strokes. Define separately how the assembly must behave if the air supply is lost.
In a spring-return actuator, compressed air drives one direction and springs provide the return stroke when air pressure is removed. Specify the required valve position on loss of air and check the selected spring configuration.
Mounting and Control Accessories
The catalogue describes ISO 5211 valve mounting and NAMUR accessory interfaces. Check the mounting pattern, shaft dimensions, engagement depth and torque capacity for the specific valve and actuator.
ASV solenoid valves and ALS limit switch boxes can be considered for control and feedback. Confirm their mechanical and pneumatic interfaces before specifying the assembly.
How to Size an AMT Actuator
Valve diameter alone does not determine actuator size. Provide the valve operating torque under process conditions, available air pressure, operating configuration, required failure position and selection safety factor.
For spring-return operation, check both air-stroke and spring-stroke torque throughout the travel against the valve requirements. ALFACOM can assist with selection and a valve-and-actuator assembly to the agreed specification.
Technical Catalogue
Review the AMT catalogue for model-specific configurations, technical data and dimensional drawings.
Questions About Selection
Does ISO 5211 mounting guarantee direct installation?
No. Check the bolt pattern, shaft shape, shaft size and engagement depth. A bracket and coupling may be required for the selected assembly.
What should I send when replacing an actuator?
Send the existing model and nameplate, valve model or datasheet, process conditions, available air pressure and required control, feedback and failure position.
Related ALFAMATIC Equipment
Discuss Your Application
Send your requirements or a photo of the existing equipment for technical assistance and a quotation.
Availability and lead time are confirmed for the requested model and quantity.