HA4AD/71 - Hansen - 3 (80MM) Dual Pressure Regulator Range A/A

The Hansen HA4AD/71 is a 3" (80 mm) dual pressure regulator from the HA4A series, designed for ammonia (NH₃) and other industrial refrigerants. It features a dual pilot configuration (Range A/A), offering enhanced control, redundancy, and flexibility in demanding refrigeration applications.

🔧 Technical Specifications

• Model: HA4AD/71
• Port Size: 3" (80 mm)
• Connection Type: Flanged
• Pressure Range: Range A / A (typically for lower pressure applications)
• Body Material: Ductile iron (ASTM A536)
• Piston: Steel, disc type with Teflon® piston seal
• Pilot Trim: Stainless steel
• Safe Working Pressure: 400 PSIG (27 bar)
• Operating Temperature: –60°F to +240°F (–50°C to +115°C)
• Weight: ~89 lbs

🌟 Key Features

• Dual Pilot Design:
  • Allows for redundant control, dual setpoints, or fail-safe operation.
  • Ideal for critical systems requiring continuous regulation even during maintenance or failure of one pilot.
• Modular Construction:
  • Interchangeable pilots for various control functions.
  • Easy maintenance and upgrades.
• High Dirt Tolerance:
  • Teflon® dirt-wiping piston seals ensure reliable operation in dry or oil-free systems.
• Manual Opening Stem:
  • Located on top to avoid contamination from rust or debris.
• Sealing:
  • Teflon seating and stainless steel spring closing.
  • Non-asbestos gaskets.