The part number D-4300-8350 is a Johnson Controls D-4300 Series Linear Pneumatic Damper Actuator. It is a direct-acting actuator with a spring range of 21–103 kPa, a supply pressure of 138–172 kPa, a force output of 73–138 N, and a 70 mm stroke.

Specification & Description of D-4300-8350

• Manufacturer/Brand: Johnson Controls
• Series: D-4300 Pneumatic Piston Actuators
• Type: Linear pneumatic damper actuator, direct acting
• Spring Range: 21–103 kPa (3–15 psig)
• Supply Pressure: 138–172 kPa (20–25 psig)
• Force Output: 73–138 N (16–31 lbf)
• Stroke Length: 70 mm (2.75")
• Fail Position: Built-in spring return for fail-safe operation
• Construction:
  • Die-cast aluminum housing for durability
  • Stainless steel extending shaft for corrosion resistance
  • Synthetic elastomer diaphragm for extended life
  • Fully enclosed housing to protect internal parts from dirt and damage
• Operation:
  • Air pressure from a pneumatic controller is applied to the diaphragm.
  • This drives the piston and shaft against the spring force and external load.
  • Provides precise positioning of dampers and mixing boxes in HVAC systems.