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

The Hansen HA4AK/21 is a 1" (25 mm) reseating relief regulator from the HA4A modular series, designed for use in ammonia (NH₃) and other industrial refrigeration systems. It is engineered for automatic reseating after pressure relief, making it ideal for systems requiring continuous protection and minimal downtime.

🔧 Technical Specifications

• Model: HA4AK/21
• Port Size: 1" (25 mm)
• Connection Type: Threaded (FPT)
• Pressure Range: Range 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: ~26 lbs

🌟 Key Features

• Reseating Relief Function:
  • Automatically reseats after relieving excess pressure.
  • Ideal for systems where manual reset is impractical.
• 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.
• Applications:
  • Cold storage, meat and poultry processing, ice plants, breweries, petrochemical, pharmaceutical, and supermarket refrigeration systems.