Rotary Actuator (Rack & Pinion)

Rack and Pinion Pneumatic Actuator are designed for precision control of quarter-turn valves, such as ball and butterfly valves, in industrial automation systems. Built to ISO 5211 mounting standards, it ensures seamless integration with various valve types.

• Type: Pneumatic Rotary Actuator (Rack and Pinion
• Operation: Available in Double Acting and Spring Return versions
• Mounting Interface: ISO 5211 flange pattern for direct valve coupling
• Torque Output: Wide torque range suitable for valves from ½” to 24”
• Body Material: High-grade extruded aluminum with hard anodized finish

Piston Material: Die-cast aluminum, Extrusions

Temperature Range: -20°C to +80°C (standard), with optional high-temp or low-temp seals

Working Pressure: 2.5 to 8 bar (standard operating range)

Rotation: 90° (±5° adjustable travel stops)

Position Indicator: Visual dome-type indicator for valve position verification

Air Supply Ports: BSP or NPT threaded as per client request

Seals: Buna-N (standard); Viton or Silicone (on request)

Key Features:

• Symmetrical rack & pinion design ensures balanced torque in both directions
• Preloaded coated springs in spring-return models for safe fail-close/fail-open operations
• Modular design allows easy maintenance and accessory mounting
• Corrosion-resistant body suitable for indoor and outdoor environments
• Compatible with positioners, solenoid valves, and limit switch boxes 

Applications:

• Oil & Gas Pipeline Automation
• Water and Effluent Treatment Plants
• Chemical and Petrochemical Industry
• Food and Beverage Plants
• Cement and Steel Industries

A Pneumatic Rotary Actuator (often designed with a Rack and Pinion mechanism) is a device that uses compressed air to generate a rotary or oscillating motion from a linear input.1??? Mechanism and FunctionThe core function is to convert the linear force of a piston into rotational torque. This is achieved via the Rack and Pinion assembly:Piston and Rack: The compressed air pushes a piston which is connected to a rack (a straight bar with teeth).2 The movement of the piston is linear.Pinion and Output Shaft: The rack's teeth mesh with the teeth of a pinion (a small gear).3 As the rack moves linearly, it causes the pinion to rotate.4Rotary Output: The pinion is mounted on the output shaft, delivering the rotational torque needed to operate a mechanism, such as opening and closing a quarter-turn valve (e.g., ball or butterfly valve).?? Key FeaturesMotion: Produces a limited angle of rotation, typically $90^\circ$ or $180^\circ$.Power: Ideal for applications requiring high torque at moderate speeds.5Usage: Commonly used in automated process control systems to remotely and quickly turn valves.