HA4AD/31 - Hansen - 1-1/4 (32MM) Dual Pressure Regulator Range A/A

The Hansen HA4AD/31 is a 1-1/4" (32 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) for enhanced control and redundancy in demanding refrigeration environments.

🔧 Technical Specifications

• Model: HA4AD/31 (also listed as HA4AD-4/31)
• Port Size: 1-1/4" (32 mm)
• Connection Type: 4-bolt flange
• Pressure Range: Range A / A (low-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: ~26 lbs

🌟 Key Features

• Dual Pilot Design:
  • Provides redundancy or dual-function control (e.g., pressure regulation and override).
  • Ideal for systems requiring fail-safe operation or dual setpoints.
• Modular Construction:
  • Interchangeable pilots for various control functions.
  • Easy maintenance and upgrades.
• High Dirt Tolerance:
  • Teflon® dirt-wiping piston seals.
  • 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.