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D/R Series Spring-Diaphragm Pneumatic Linear Actuators

D/R Series actuators are linear spring diaphragm pneumatic actuators designed for reliable operation of control valves. The D/R is a rugged unit available in a combination of case sizes, strokes and springs to satisfy a wide range of applications.


  • Rolling diaphragm provides excellent sensitivity and provides maximum constant effective area, which translates into improved linearity
  • Modular construction provides maximum part interchangeability between direct and reverse-acting models and between selected case sizes
  • High spring rates improve control valve stability
  • Minimal guiding assures low hysteresis in reverse-acting models ‒ zero hysteresis in direct-acting models
  • Stainless steel stems are standard for maximum performance in corrosive environments

D/R Series Spring-Diaphragm Pneumatic Linear Actuators

DR brochure