HA4AK/31 - Hansen - 1-1/4 (32MM) Reseating Relief Regulator Range A

The Hansen HA4AK/31 is a 1-1/4" (32 mm) reseating relief regulator from the HA4A modular series, designed for use in ammonia (NH₃) and other industrial refrigeration systems. It is engineered to automatically reseat after relieving excess pressure, making it ideal for systems requiring continuous protection and minimal downtime.

🔧 Technical Specifications

• Model: HA4AK/31
• Port Size: 1-1/4" (32 mm)
• Connection Type: 4-bolt flange
• Pressure Range: Range A (typically for lower pressure applications)
• Safe Working Pressure: 400 PSIG (27 bar)
• Operating Temperature: –60°F to +240°F (–50°C to +115°C)
• Body Material: Ductile iron (ASTM A536)
• Piston: Steel, disc type with Teflon® piston seal
• Pilot Trim: Stainless steel
• Weight: ~26 lbs

🌟 Key Features

• Reseating Relief Function:
  • Automatically reseats after pressure relief.
  • Ideal for systems where manual reset is impractical or unsafe.
• Modular Design:
  • Interchangeable pilot modules 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.
• Certifications:
  • CSA Certified
  • CRN for Canada