Pressure differential regulator Herz 4002 DN32

The Herz 4002 DN32 pressure differential regulator is designed for hydronic heating and cooling systems to maintain a stable preset differential pressure across circuits. It automatically compensates for pressure fluctuations caused by pump speed changes or valve adjustments, ensuring consistent flow to radiators, convectors and control valves. The compact DN32 body and direct-acting control element enable straightforward integration into residential and commercial installations where differential pressure control and hydraulic balancing are required.

Advantages

The regulator provides automatic pressure stabilization without external power, reducing the risk of noise, valve hunting and system imbalance. Constructed for compatibility with standard pipework, it helps protect thermostatic and motorized control valves from pressure spikes and ensures predictable actuator behavior. The device is designed for low maintenance operation and contributes to improved system efficiency by maintaining stable flow rates under varying load conditions.

Suitable for

• Hydronic heating circuits in apartments, houses and light commercial buildings
• Cooling systems with variable pump speeds
• Balancing and commissioning of distribution manifolds and risers
• Protection of thermostatic, zone and motorized control valves

Key specifications

• Nominal diameter: DN32
• Function: maintenance of constant differential pressure
• Operation: direct-acting mechanical regulator (no external power required)
• Suitable media: water and glycols in typical HVAC concentrations
• Typical applications: heating and cooling circuits, balancing tasks

How to use

Install the regulator in the return or feed line at the location recommended by the system designer, observing flow direction marking. Set the required differential pressure according to system design parameters; adjustment is typically performed using the built-in actuator or screw provided. After installation, purge air from the circuit and verify correct operation by observing stable flows and steady actuator response across load changes. Commission the system following standard hydraulic balancing procedures to ensure correct distribution.

Usage recommendations

Choose the preset differential pressure based on pipe sizing and valve characteristics, and check compatibility with heat-transfer fluids used in the system. Regularly inspect for tightness and correct operation during scheduled maintenance intervals; ensure strainers and filters upstream are clean to prevent particulate damage.