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D/R Series Spring-Diaphragm Pneumatic Linear Actuators
Brand: Koso Hammel DahlD/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.
The Type D, direct-acting actuator, strokes downward with an increase in air pressure.
An opposing spring provides a fail-open response when attached to push-down-to-close globe control valves.
With the Type R, reverse-acting actuator, an increase in air pressure retracts the actuator stem, providing fail-close response when attached to push-down-to-close globe control valves.
For valves requiring longer travel and higher thrusts, the A46 and A47 are available. The A46 is a direct-acting actuator, while the A47 is a reverse-acting model.
Features- 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
Specifications
Brand
Diaphragm Cases
- Pressed Steel
Stem
- 303 Stainless Steel
Diaphragm
- Dacron Reinforced Nitrile
Maximum Case Pressure
- D/R Series: 65 psi
- A46/A47: 45 psi
Temperature Limits
- -40° F to 180° F
- -40° C to 82° C