Contoured Diaphragm Flexible Couplings

  • Exceptional balance repeatability
  • Weld free design eliminates weld zone material degradation
  • Modular bolted and splined components allow for easy maintenance 
Diaphragm Coupling Manufactured By Riverhawk
Riverhawk manufactured Diaphragm Coupling

Built To Any Specification

  • Available configurations include API 671”,  API 610” , AGMA 9000 & 9110 balance, AGMA 9002 & 9112 keyed fits, AGMA 9003 & 9103 keyless fits
  • Low and High Speed Bolted Designs
  • Low moment configuration available
  • Can be built to accommodate torque management devices and other accessories

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Standard Rating Specifications

DesignationOD (in)Rated Torque (in-lbs)Peak Torque (in-lbs)Limit Torque (in-lbs)Axial Misalignment (in-lbs)Angular Misalignment (deg)Rated Speed (RPM)
3066.0019,00024,700 30,350 0.0540.3320,000
4066.0027,800 34,200 43,100 0.0440.2520,000
5066.0032,000 41,800 51,780 0.0360.2020,000
3077.2036,200 46,600 57,100 0.0680.3318,000
4077.2051,800 64,100 80,300 0.0550.2518,000
5077.2061,80080,500100,110 0.0440.2018,000
3088.7069,000 85,800 110,000 0.0940.3316,000
4088.7098,000 120,900 147,000 0.0680.2516,000
5088.70117,000 150,000 189,500 0.0550.2016,000
31010.50131,300 167,300 210,000 0.1120.3313,000
41010.50184,000 231,000 285,500 0.0850.2513,000
51010.50220,200 286,200 356,700 0.0670.2013,000
31212.60250,200 325,200 400,400 0.1360.3311,000
41212.60339,500 432,200 543,300 0.1060.2511,000
51212.60416,000 540,800 673,900 0.0820.2011,000
31515.20476,700 619,700 763,000 0.1650.3310,000
41515.20638,000 815,100 1,020,800 0.130.2510,000
51515.20784,200 1,019,500 1,270,400 0.10.2010,000
31818.30906,000 1,177,800 1,450,000 0.1960.339,000
41818.301,190,000 1,516,500 1,904,000 0.160.259,000
51818.301,480,000 1,924,000 2,397,600 0.1220.209,000
32222.001,730,000 2,212,900 2,681,000 0.240.338,000
42222.002,210,000 2,797,000 3,481,000 0.1970.258,000
52222.002,793,000 3,630,000 4,525,000 0.1480.208,000

Ratings shown above are consistent with API 671. Please contact us directly if your application has additional requirements not covered in the table.