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Bettis RPX‑006M Spring Return Pneumatic Actuator
Bettis RPX‑006M Spring Return Pneumatic Actuator
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The Bettis RPX-006M from the RPX Series is a high-quality spring-return (fail-safe) pneumatic rack-and-pinion actuator designed for quarter-turn valve automation (ball, butterfly, plug) in industrial environments. The series supports modular spring sets for varied torque outputs, ISO 5211 valve-mounting, and ATEX / PED certifications for hazardous area usage.
Maximum operating pressure (MOP): 8.3 bar / 120 psi.
Standard operating temperature range: –20 °C to +80 °C.
Modular spring-set design for fail-safe operation (spring cartridge range from 2.8 bar to 8.3 bar equivalent).
Key Features
Rack-and-pinion design for reliable quarter-turn actuation.
Spring-return (single-acting) mechanism: actuated by air in one direction, returned by springs on air loss.
Extruded aluminium body with cast aluminium end caps, anodised & powder coated for corrosion resistance.
Travel stop adjustment (±5°) at both open and close ends to fine-tune valve stroke.
Dual ISO 5211 (and DIN 3337) mounting flange patterns, plus NAMUR accessory interface for solenoids/positioners.
Certified for use under ATEX / PED / Machinery Directive environments.
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FAQ's
What is the difference between a valve and an actuator?
What types of actuators are available?
The main types of actuators are:
Pneumatic actuators – use compressed air for fast, reliable operation.
Electric actuators – use electrical power for precise control.
Hydraulic actuators – use fluid pressure for high-torque applications.
Each type offers unique advantages depending on the environment, media, and system control needs.
How do I choose the right actuator for my valve?
To select the correct actuator, consider:
Valve type and torque requirement
Power source available (air, electric, or hydraulic)
Operating environment (temperature, humidity, hazardous area)
Control signal type (on/off or modulating)
Matching actuator torque and compatibility with the valve’s ISO mounting ensures reliable performance.
What are the main types of valves used in automation?
The most common valves in automated systems include:
Ball valves – for tight shutoff and quick operation.
Butterfly valves – for larger flow control with compact design.
Globe valves – for precise throttling and flow regulation.
Check valves – to prevent backflow.
Gate valves – for full bore flow isolation.
What’s the difference between a double-acting and spring-return actuator?
Double-acting actuators use air (or power) to both open and close the valve.
Spring-return actuators use air to open (or close) the valve, and a built-in spring to automatically return it to a safe position when power or air is lost — ideal for fail-safe operation.
How often should valves and actuators be serviced?
Regular maintenance intervals depend on operating conditions, but a good rule of thumb is to inspect every 6–12 months.
This includes checking for leaks, lubrication, seal wear, and actuator responsiveness to prevent unexpected downtime.