Materials
- Body: DZR brass.
- Valve stem: stainless steel 1.4301.
- Membrane and O-rings: EPDM.
- Compression spring: spring steel 1.4310.
Differential Pressure Controller
HERZ 4002 / 4202 DZR Brass Differential Pressure Controller
4002 / 4202 Series — DZR Brass, DN15–DN50
HERZ 4002 / 4202 DZR Brass Differential Pressure Controller from HERZ Armaturen keeps a set differential pressure of 5–30 or 25–60 kPa in heating and cooling risers without auxiliary power, DN15 to DN50.
Manufactured by
HERZ Armaturen
HERZ 4002 / 4202 DZR Brass Differential Pressure Controller
Review the confirmed product information, including description, features, benefits, and applications.
The HERZ 4002 / 4202 Differential Pressure Controller from HERZ Armaturen stabilizes the differential pressure in heating and cooling circuits without external energy, keeping consumers independent of dynamic fluctuations in the riser.
Its DZR brass body and EPDM membrane provide corrosion resistance and long-term performance. The setpoint is adjustable between 5–30 kPa or 25–60 kPa, and a 1,000 mm capillary is included for connection to the partner valve in the flow.
Pressure & Temperature
- Maximum operating pressure: 16 bar (4002) or 25 bar (4202).
- Maximum differential pressure on the body: 4 bar.
- Maximum temperature: 130°C up to DN32; 110°C for DN40–DN50.
- Minimum temperature: 2°C (water); -20°C with frost protection.
Control & Sizes
- Setpoint ranges: 5–30 kPa or 25–60 kPa.
- Sizes DN15 to DN50; kvs 2.66 to 14.95.
- 4002: male thread; 4202: female thread.
Installation
- Installed in the return, in any position.
- 1,000 mm capillary included.
- Water quality to ÖNORM H 5195 / VDI 2035.
Stable Differential Pressure
Holds a constant differential pressure across risers or branches.
System Efficiency
Supports comfort and efficiency in variable-flow systems.
Precise Setting
Setpoint adjustment with a visual scale.
Low Maintenance
Corrosion-resistant materials for maintenance-free operation.
HERZ 4002 / 4202 controllers balance risers and branches in building heating and cooling systems.
Residential & Commercial Circuits
Heating and cooling circuits in residential and commercial buildings.
Fan Coil & Zone Control
Fan coil and zone control systems.
Radiator & Underfloor Loops
Radiator and underfloor heating loops.
Multi-Branch Networks
Pressure balancing in multi-branch hydronic networks.
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