Bray Series 92/93 are rack-and-pinion, opposed-piston pneumatic actuators for butterfly and ball valves, available in double-acting or spring-return configurations. With output torque up to 4,986 Nm, they operate in dry compressed air or inert gas systems from -40°C to 149°C and up to 10 bar. They are suitable for on/off and throttling control in industrial fluid pipelines and can withstand humid, dusty, or corrosive exposure environments.
Series 92/93 Pneumatic Actuator Product Image
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Bray Series 92/93 Rack-and-Pinion Pneumatic Actuators
Rack-and-pinion pneumatic actuators for on/off control of butterfly valves and ball valves, with spring-return options.
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Specifications
- Actuator Type
- Rack and pinion opposed-piston pneumatic actuator
- Output Torque
- Up to 44,130 in-lb (4,986 Nm)
- Operating Temperature Range
- -40°F to 300°F (-40°C to 149°C)
- Maximum Allowable Operating Pressure
- Up to 140 psig (10 bar)
- Supply Medium
- Dry compressed air, inert gas
- Control Mode
- On/off, throttling
- Actuation
- Double-acting, spring-return
- Rotation Angle
- Double-acting 90°, 135°, or 180°; spring-return 90°
- Travel Adjustment Range
- +5° to -5°
- Protection Rating
- IP66/IP67M, compliant with IEC 60529
- Mounting Standard
- ISO 5211: 2001(E)
- Accessory Interface Compatibility
- NAMUR
- Valve Compatibility
- Butterfly valves, ball valves
- Certifications
- ABS, ATEX, Bureau Veritas, PED, SIL 3
Application scenarios
Pneumatic On/Off and Throttling Control of Butterfly and Ball Valves in Industrial Fluid Piping
Used with butterfly and ball valves in industrial automation fluid piping, driven by dry compressed air or inert gas to provide valve on/off and throttling control; the actuator complies with the ISO 5211 mounting standard and is compatible with NAMUR accessories.
Valve Actuation in Wet, Dusty, or Corrosive Environments
Used in industrial valve stations exposed to moisture, water spray, dust, or corrosive conditions, providing pneumatic actuation for butterfly and ball valves. This series features an IP66/IP67M protection rating, with optional special coatings and materials for corrosive environments.
Selection points
Opposed-Piston Rack-and-Pinion Design
The Series 92/93 features an opposed-piston pneumatic actuator design with a rack-and-pinion mechanism.
Double-Acting and Spring-Return Rotary Configurations
The Series 92 is a double-acting actuator available with 90°, 135°, or 180° rotation; the Series 93 is a 90° spring-return actuator. Both configurations are suitable for on/off and throttling applications.
Independent Travel Limit Adjustment at Open and Closed Ends
Two independently adjustable travel stop screws and an output shaft cam allow bidirectional adjustment of the open and closed positions of 90° rotary valves from +5° to -5°.
ISO 5211 Direct Mounting and NAMUR Accessory Compatibility
The actuator complies with the ISO 5211:2001(E) mounting dimension standard and can be mounted directly on Bray valves without external connections. It is also compatible with NAMUR accessory interfaces.
Corrosion-Resistant Material and Coating Options
The standard unit features an anodized aluminum body and polyester-coated covers, with special coating and material options available for corrosive environments.
Installation & maintenance notes
Mounting Interface and Coaxial Alignment
During installation, confirm that the actuator and valve comply with ISO 5211 mounting dimensions and ensure proper alignment of the connection to minimize installation deviations and the risk of operating interference.
Compressed-Air Quality and Supply Pressure
Standard pneumatic configurations should use dry compressed air or inert gas. The supply pressure must not exceed the actuator's maximum allowable operating pressure of 140 psig (10 bar).
FAQ
What is the operating principle of the Series 92/93 rack and pinion pneumatic actuators?
Series 92/93 actuators provide quarter-turn control through the relative motion of the rack and pinion. Double-acting and spring-return versions can operate in on/off and throttling applications, providing stable positioning and repeatability.
How should double-acting and spring-return versions be distinguished during selection?
The double-acting version is used where powered opening and closing action with bidirectional control is required. The spring-return version automatically returns to its initial position in the event of air supply loss or pressure loss. Selection should be based on control requirements and the operating pressure range.
What angle options are available for this series, and how is angle adjustment achieved?
Versions with 90°, 135°, and 180° rotation are available. The cam on the output shaft and adjustable travel stop screws at both ends provide ±5° fine positioning adjustment to match valve open and closed positions.
What are the performance limits of this actuator under temperature and pressure conditions?
Operating pressure is up to 140 psig (10 bar), with a temperature range of -40°F to 300°F (-40°C to 149°C). Confirm specific temperature limits according to the actual model and service medium.
How is compatibility with ISO 5211 and valve interfaces achieved?
The actuator complies with ISO 5211 dimensional standards and can be mounted directly to the valve without external couplings, simplifying field installation while helping reduce misalignment and contaminant accumulation.
Documents
Product Brochure - Series 92/93 Pneumatic Actuators and AccessoriesProduct information · EnglishProduct Brochure - Actuators and ControlsProduct information · EnglishProduct Brochure - Actuadores Neumáticos y Accesorios Serie 92/93Product information · EnglishProduct Brochure - Series 92/93 Pneumatic Actuators and AccessoriesProduct information · ChineseIOM Manual - Series 92/93 Pneumatic ActuatorsManual · EnglishIOM Manual - pneumatický pohon typ 92/93Manual · EnglishIOM Manual - Serie 92/93 Actuador NeumáticoManual · EnglishSafety Manual - Series 92/93 Pneumatic ActuatorsManual · EnglishTechnical Manual - Series 92/93 Pneumatic ActuatorsManual · EnglishTechnical Sales Manual - pneumatické pohony typ 92/93Manual · EnglishRecommended Specifications - Series 92/93 Pneumatic ActuatorsProduct information · English