The Tork-Mate® 890 series, extended-life actuators are ideal for the operation of 90º-turn devices such as butterfly valves, ball valves, plug valves, damper valves, and other devices. Tork-Mate® pneumatic actuators have features that are unique, providing many benefits to the user looking for worry-free service.
  • TMHC 2324
    A proprietary two-step, hardcoat process that offers superior protection on interior and exterior housing surfaces, TMHC 2324 also ensures maximum life from the piston seals, piston bearings, and heel bearings.
  • NAMUR Mounting
    Tork-Mate® 890 series actuators meet the latest NAMUR standards, allowing direct or close coupling of NAMUR-designed accessories. The pinion interface features a positive, international standard drive for positioners, switches, and other accessories. The solenoid interface allows direct acceptance of any NAMUR-designed control valves.
  • Modular
    Easily removable end caps and modular spring packs simplify the conversion from double-acting to spring-return configurations.
  • Travel Adjustment
    The Tork-Mate® 890 series actuators feature pinion travel stops that allow a full ±100 of valve travel adjustment. As an option, extended-stroke adjustment screws can be added for inexpensive throttling applications.
  • Extended Cycle Life
    Special piston seals provide greatly extended life compared to standard O-ring actuators. All other bearings, seals, and components have been engineered to provide superior and extended service lives.
  • Blow-out Proof Pinion Gear
    In addition to the stainless-steel pinion retaining ring, the Tork-Mate® 890 series actuators feature a unique, internal safety bar.
  • Operating Ranges
    Tork-Mate® 890 series, double-acting actuators produce guaranteed minimum torque outputs up to 17,466 inch/pounds (1973 Nm).
  • Imperial or Metric Mounting
Unit of Measure


Spring Return

N/A Metric

Inboard Volume

N/A 167 cm³

Spring Set

N/A 6

Spring Torque Output (Start)

N/A 21 N·m

Spring Torque Output (End)

N/A 14 N·m

Max. Operating Pressure

N/A 8.6 bar

Air Pressure Torque Output at Operating Pressure 6.9 bar (Start)

N/A 17 N·m

Air Pressure Torque Output at Operating Pressure 6.9 bar (End)

N/A 8 N·m

Air Pressure Torque Output at Operating Pressure 8.3 bar (Start)

N/A 23 N·m

Air Pressure Torque Output at Operating Pressure 8.3 bar (End)

N/A 14 N·m



N/A 193.8 mm


N/A 246.1 mm


N/A 96.9 mm


N/A 26.1 mm


N/A 66 mm


N/A 82.6 mm


N/A 41.3 mm


N/A 84.2 mm


N/A 52.4 mm


N/A 82.6 mm


N/A 29.8 mm


N/A 35.4 mm


N/A 17.7 mm


N/A 41.3 mm


N/A M6 x 1


N/A 9.5 mm


N/A M6 x 1


N/A 9.5 mm


N/A 11 mm


N/A 27.7 mm


N/A 14.3 mm

Approx. Weight

N/A 3.5 kg


N/A 1. Piston
Aluminum alloy designed for the most demanding applications.
2. Piston bearing
Low friction wear band centers the piston for extended life.
3. Piston Seal
A double acting, PTFE, O-ring ener gized seal minimizes friction and requires an extremely low breakaway force. Provides a much longer life than conventional O-rings.
4. Pinion
High strength steel, plated for corrosion resistance. Precisely ma chined gear minimizes wear and backlash.
5. Piston Rack
Precision engineered tooth profile and wide engage ment with pinion minimizes wear and maximizes strength. An integral safety bar (Models 5000 and 11000 feature interlocked tooth geometry to prevent pinion blowout.) prevents any possible pinion blowout.
6. Pinion Bearings
A proprietary high wear, low friction acetal compound extends life.
7. Pinion Seals
Nitrile, specially lubricated for life.
8. Lubrication Groove
Unique lubrication groove between the piston seal and piston bearing holds the proper amount of grease where it is needed for maxi mum life.
9. Thrust bearing
Designed for maximum life.
10. Fasteners
304 stainless steel are high strength and corrosion resistant.
11. End Caps
Special aluminum alloy for durability. Powder coated for corrosion resistance and durability. Optional spring return end caps have restrained springs for easy installation.
12. Housing
Extruded aluminum alloy, precision machined with a proprietary hard coat finish internally and externally to guard against wear and corrosion.
13. Piston Heel Bearing
Large acetal bearing controls gear backlash and eliminates rack fatigue.

Principle of Operation

N/A Spring Return
For clockwise operation, Port 2 is open to atmosphere and air pressure is directed to Port 1. The air pressure compresses the springs and moves the pistons outward. As the pistons move apart, the pinion rotates clockwise. The linear movement of the pistons is converted to rotary motion by the piston racks and the output pinion gear.
For counterclockwise operation, Port 1 is open to atmosphere and air pressure is directed to Port 2. High pressure and/or spring force moves the pistons inward, rotating the pinion counterclockwise.

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