Technical Data

Bearing Load Capacities

BEARING LOAD CAPACITIES FLO-TORK hydraulic rotary actuator bearings are sized to accept external loads. This feature often allows the shaft to be mounted directly to the rotary actuator without flexible couplings and outboard bearings, utilizing the FLO-TORK actuator as the bearing.

MAXIMUM EXTERNAL RADIAL LOAD L*
MODEL NOS. 900 1,800 3,700 7,500 15,000 30,000 75,000 150,000 300,000 600,000
Dim "D" in/mm .81220.62 .81220.62 1.12528.58 1.12528.58 2.19555.75 2.19555.75 2.81271.42 2.81271.42 4.50114.3 4.50114.3
PSIBAR LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg. LB.Kg.
00 1,349612 1,349612 1,856842 1,856842 3,9591,796 3,9591,796 22,34910,138 22,34910,138 41,03818,615 41,03818,615
1,00069 1,188539 1,349612 1,479671 1,856842 2,8901,311 3,9591,796 19,8959.024 22,34910,138 31,21614,160 41,03818,615
2,000138 1,027466 1,349612 1,102500 1,856842 1,821826 3,9591,796 17,4417,911 22,34910,138 21,3949,704 41,03818,615
3,000207 865392 1,349612 725329 1,856842 752341 3,9591,796 14,9876,798 22,34910,138 11,5715,249 41,03818,615
MAXIMUM EXTERNAL THRUST LOAD T*
00 2,5951,177 2,5951,177 4,1401,878 4,1401,878 7,6053,450 7,6053,450 36,82516,704 36,82516,704 39.61217,968 39.61217,968
1,00069 2,4211,098 2,5951,177 3,6691,664 4,1401,878 6,4552,928 7,6053,450 33,39615,148 36,82516,704 31,33814,215 39.61217,968
2,000138 2,2471019 2,5951,177 3,1981,451 4,1401,878 5,3052,406 7,6053,450 29,87013,549 36,82516,704 23,09810,477 39,61217,968
3,000207 2,073940 2,5951,177 2,7271,237 4,1401,878 4,1551,885 7,6053,450 26,34411,950 36,82516,704 14,8606,740 39.61217,968

*Caution: L is the maximum allowble external radial load at the maximum distance D (distance from housing to middle of keyway as shown on the chart as dimension D). To find L match the model and maximum operating pressure to find the maximum external radial load L on the rotary actuator. T is the maximum allowable external thrust load. To find T, match the model and maximum operating pressure to find the maximum thrust load on the rotary actuator. For combined radial and thrust loads consult the factory.

SPECIAL CONSIDERATIONS

  1. Special system design consideration must be given to applications that involve high speed rotation, high cycle life, eccentric external loading conditions, or when the actuator maximum allowable pressure is exceeded. These design considerations may include internal or external shock absorbers, external controlled stops, special material or hardness treatment for actuator internal parts, and special hydraulic system controls. See additional caution note on Rotary Formulas.
  2. Cushions are available on FLO-TORK air and hydraulic rotary actuators. FLO-TORK's adjustable cushions will help absorb deceleration forces smoothly through the last 15° of rotation.
  3. Position holding or braking is possible by using "holding" valves or pilot operated checks. The FLO-TORK rotary actuator provides positive holding when used with good quality holding or locking valves.
  4. Speed control can be accomplished by controlling the fluid being exhausted from the rotary actuator (meter-out). Meter-out speed control is preferred to meter-in control, as it prevents runaway or cavitation. Consult factory for rotational speeds exceeding 90° in one second.
  5. Cross-over relief valves may be required to limit shock pressures and protect components in the system.
  6. System cleanliness, the life and reliability of rotary actuators as well as other fluid power components are largely dependent upon system cleanliness. The best service life can be obtained by:
    1. Complete flushing of each segment of the hydraulic circuit before connecting to the rotary actuator.
    2. Providing suction line filters of 100 mesh screen or finer and pressure line filters of 25 micron nominal or finer.
  7. Slow rotation - The enclosed gear cases of FLO-TORK hydraulic rotary actuators are filled sufficiently with gear oil to lubricate the moving parts by immersion and splashing. In applications with slow rotation caution must be taken to insure that lubricant reaches upper gear components.
  8. Hollow shaft - A high strength steel shaft with full length key engagement is recommended to mate with FLO-TORK's high strength hollow shaft pinion.

SPECIAL DESIGNS

The following are examples of FLO-TORK designs to satisfy special customer applications:

  1. Three position actuators
  2. Air-Oil actuators for air operations with oil speed control
  3. Non tie-rod design
  4. Spring return
  5. Manifold piping
  6. Built-in control valves

For special designs please forward a completed Application Specification Guide to Flo-Tork, Inc.

Note: The foregoing engineering information was developed from theoretical considerations to illustrate how to select a FLO-TORK rotary actualtor for a specific application. FLO-TORK does not intend, nor we we wish imply, that these same performance charactersitics will prevail in your applications, and the information is to be used as a guide only.

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