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The No. 4 Pneumatic Damper Actuator is a totally enclosed pneumatic piston type actuator designed to actuate dampers for ventilating systems, mixing box control, and other applications requiring a large, effective diaphragm area and long stroke. The No. 4 Hesitation Actuator is frequently used to operate the outdoor air damper on unit ventilators.

  • All metal body construction
  • Replaceable, ozone-resistant, EPDM rubber, rolling diaphragm
  • Pivot mounting for extended shaft or frame mounting
  • Fixed bracket mounting
  • Direct front mounting
  • Positioning relay (optional)
  • Forward travel stops (optional)
  • Adjustable hesitation point (hesitation actuator only)
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Manuals (2)
Product Type:
Spring Range:
8 to 13 psi
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