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Series 98

Pneumatic Actuator


Output Torque

2,744 to 885,100 in-lb (310 to 100,000 Nm)

Temperature Range

-50°F to 300°F (-46°C to 149°C)

Maximum Allowable Operating Pressure

40 – 150 psi (2.8 – 10.3 bar)

Power Source



ISO 5211: 2001(E), MSS SP-101-1989




Symmetrical Yoke, Canted Yoke, Extended Stop, Hydraulic Override, Jack Screw, Jack Screw Gear Driven Override, Hydraulic Damper, Partial Stroke/Lockout


Emergency Shutdown

Control Options

On/Off, Direct Acting, Spring Return

Enclosure Ratings

IP66/IP67M per IEC 60529

Supply Media

Dry Compressed Air, Inert Gas

Valve Compatibility

Ball Valves, Butterfly Valves

Features & Benefits

The Series 98 pneumatic (Series 98H hydraulic) Scotch-Yoke actuator is a modular, fully configurable product line for flexibility and efficiency.

The compact design offers a high torque to weigh ration and its modular design offers easy configuration in the field.

Based on customer needs, the S98 and S98H can be configured to suit any application.


  • Compact design offers a high torque to weight ratio
  • Modular Design offers easy configuration in the field
  • Module alignment ensured by precision machined centering rings
  • Torque Output ranging from 2,744 to 885,100 in-lb (310 to 100,000 Nm)
  • Spring End Torque ranging from 2,744 to 445,261 in-lb (310 to 50,306 Nm)
  • Standard premium epoxy/polyurethane coating

Operating Conditions

  • Pressure Range: 40 – 150 psi (2.8 – 10.3 bar)
  • Media: Dry Compressed Air/Inert 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 per ISO 5211: 2001(E)
  • Accessories: Shaft Driven Accessories Mounting per NAMUR-VDE
  • Performance Testing: EN 15714-3:2009
  • Ingress Protection: IP66/IP67M per IEC 60529
  • Safety: ATEX, SIL 3 suitable, PED on request