Compact Scotch Yoke Actuator

Series 98C

Energy-Efficient Actuator with Low Air Consumption for Optimized Performance

2025-S98C-600x600 2025-S98C-02 2025-S98C-03

Versatile Power Options: Pneumatic, Hydraulic, or Electro-Hydraulic Operation

Compact and Energy-Efficient Actuator for Rotary Valves

The compact Series 98C Scotch Yoke Actuator continues Bray’s commitment to provide products which exceed customers demanding applications. By utilizing proven technologies of the larger Series 98 scotch yoke actuator, the Series 98C, tested to withstand up to 1,000,000 cycles, offers a range of compact scotch yoke actuators with torque outputs up to 17,701 lbf-in (2,000 Nm). This torque range easily covers common rotary turn valve sizes from 2” to 20”.

 

Standard 98C valve adaption includes two easily adaptable ISO 5211 mounting surfaces with a square drive output shaft which are designed to adapt to any quarter turn valve. Conversion from fail clockwise to fail counterclockwise direction is as easy as simply flipping the actuator over and reattaching to the valve. A VDI/VDE 3845 accessory mounting pad readily accepts switchboxes, sensors or positioners for provide position feedback to a facilities host system.

 

The 98C isn’t just a piece of equipment; it’s a long-term partner in performance. Maximize uptime, reduce repair cycles, and achieve optimal functionality without compromise. easy maintenance: just replace the soft components, and it’s ready to deliver peak performance year after year.

 

Have multiple power sources in your facility? Don’t worry, a Series 98C may be controlled with a pneumatic or hydraulic power source. Optionally, if electric power is the only energy source, the 98C can utilize Bray’s electro-hydraulic power unit for self-contained and emission free operation.

Specifications

Output Torque
Up to 17,701 lbf-in (2,000 Nm)
Control Options
On/Off, Direct Acting, Spring Return
Temperature Range
Standard: -20°F to 200°F (-29°C to 93°C)
High Temperature: Up to 300°F (149°C)
Low Temperature: Down to -50°F (-46°C)
Mounting
ISO 5211: 2001(E)
Supply Media
Dry Compressed Air/Inert Gas/Natural Gas
Power Source
Dry Compressed Air / Inert / Natural Gas
Certifications
ATEX, PED, SIL 3 Suitable
Maximum Allowable Operating Pressure
40 - 150 psi (2.8 - 10.3 bar)
Enclosure Ratings
IP66, IP67M & IP68 per IEC 60529
Testing Standard
In accordance with EN 15714-3
Valve Compatibility
Ball Valves, Butterfly Valves
Accessories
Shaft Driven Accessories Mounting per NAMUR-VDE
applications
Open / Close, On / Off, Modulating, Emergency Shutdown, Blowdown

Downloads

Sales Data Sheet
Compact Scotch Yoke Actuator Series 98C

Technical Sales Manual
Compact Scotch Yoke Actuator Series 98C

IOM Manual
Compact Scotch Yoke Actuator Series 98C

Safety Manual
Compact Scotch Yoke Actuator Series 98C

Features:

  • Compact design offers a high torque to weight ratio
  • Energy efficient through lower air consumption
  • Rapidly configurable for fail open or fail close operation
  • Torque Output up to 17,701 lbf-in (2,000 Nm)
  • Spring End Torque ranging from 490 to 8921 lbf-in (55 to 1008 Nm)
  • Standard premium epoxy/polyurethane coating
  • Dual Male Square Drive Stems provides easy integration with various valve types ensuring compatibility and reducing installation complexity.

Operating Conditions:

  • Pressure Range: 40 - 150 psi (2.8 - 10.3 bar)
  • Media: Dry Compressed Air/Inert Gas/Natural Gas
  • Temperature Range Options:
    • Standard: -20°F to 200°F (-29°C to 93°C)
    • High Temperature: Up to 300°F (149°C)
    • Low Temperature: Down to -50°F (-46°C)
  • Torque Base: Mounting Dimensions as per ISO 5211: 2001(E)
  • Accessories: Shaft Driven Accessories Mounting per NAMUR-VDE
  • Performance Testing: EN 15714-3:2022
  • Ingress Protection: IP66, IP67M & IP68 per IEC 60529
  • Safety: ATEX, SIL 3 suitable, PED

More Details

Features & Benefits

Cutaway Series 98c

  • A. ISO 5211 Valve Mounting:

    Two bolting surfaces for rapid integration in either Fail CW or CCW valve operation.

  • B. Dual Male Square Drive Stems:

    Provides easy integration with various valve types ensuring compatibility and reducing installation complexity.

  • C. Standard NAMUR 3845 Interface:

    Attached to the actuator ISO 5211 interface, easily convertible to support either Fail CW or Fail CCW configurations.

  • D. Blowout-proof Travel Stop:

    Provides additional safety by minimizing risk of actuator damage caused by operator error during travel stop adjustment or mechanical failure.

  • E. Honed and Hard Chrome Plated Cylinder Barrel:

    Improves actuator efficiency by reducing friction while providing superior corrosion resistance.

  • F. Quad Seal Rings:

    Ensure long-term sealing reliability, reducing maintenance requirements and extending the product’s lifecycle.

  • G. Pressure Seals:

    Reduced number of pressure seals contributes to a more robust and reliable actuator design, reducing potential for unintended air leak paths.

  • H. Hard Chrome Plated Piston Rod:

    Increases surface hardness which improves wear resistance of the piston rod and provides a smooth corrosion resistant surface for prolonged bearing and seal life.

  • I. Self-lubricating PTFE bushings:

    Supports the torque shaft and piston rod offering extended life and secure alignment.

  • J. Dry Film Lubricated Roller Bearings:

    Reduces friction and provides superior performance in demanding applications.

  • K. Dual Accessory Mounting Pads:

    For attaching actuator accessories and controls.

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