HERZ Differential Pressure Controller – DZR Brass Body (4002 / 4202 Series)

The HERZ 4002/4202 Differential Pressure Controller from HERZ Armaturen ensures stable pressure differentials in heating and cooling systems without external energy sources. Its DZR brass construction and EPDM diaphragm deliver corrosion resistance and long-term performance.

The unit allows adjustable setpoints between 5–30 kPa or 25–60 kPa, ensuring precise control of flow and system balance under varying load conditions.

  • 🔹 Body Material: DZR Brass.
  • 🔹 Pressure Range: 5–30 kPa or 25–60 kPa.
  • 🔹 Connection Type: Threaded (Male/Female options).
  • 🔹 Max Operating Pressure:
    • • 16 bar (4002 Series).
    • • 25 bar (4202 Series).
  • 🔹 Max Differential Pressure: 4 bar.
  • 🔹 Temperature Range:
    • • up to 130°C (DN ≤ 32).
    • • up to 110°C (DN 40–50).
  • 🔹 Min Operating Temperature: 2°C (with frost protection to -20°C).
  • 🔹 Membrane & O-Rings: EPDM.
  • 🔹 kVS Values: 2.66–14.95 depending on DN.
  • 🔹 Water Quality: ÖNORM H 5195 / VDI 2035 compliant.
  • 🔹 Capillary Tube: 1000 mm included.
  • 🔹 Guarantees consistent differential pressure across risers or branches.
  • 🔹 Enhances efficiency and comfort in variable-flow systems.
  • 🔹 Easy, precise setpoint adjustment with visual scale.
  • 🔹 Maintenance-free operation with corrosion-resistant materials.
  • 🔹 Compact design suitable for space-limited installations.
  • 🔹 Heating and cooling circuits in residential and commercial buildings.
  • 🔹 Fan coil and zone control systems.
  • 🔹 Radiator and underfloor heating loops.
  • 🔹 Pressure balancing in multi-branch hydronic networks.
  • 🔹 Energy-efficient HVAC distribution systems.
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