Herz bypass body for two-pipe heating system model 1718914

Herz bypass body for two-pipe heating system model 1718914 is a purpose-built hydraulic component intended for hydronic heating circuits. It provides a controlled bypass flow between supply and return lines to stabilise differential pressure and maintain proper circulation. The unit is suitable for installation in radiator branches, manifold assemblies and boiler connections where protection of control valves and balanced system hydraulics are required.

Advantages

The bypass body ensures stable system pressure by allowing excess flow to return to the circuit, reducing the risk of valve chatter and premature wear in thermostatic and motorised valves. Its compact design simplifies integration into existing two-pipe layouts and supports reliable hydraulic balance without complex adjustments. Constructed for professional HVAC use, the component contributes to efficient heat distribution and reduces strain on the circulation pump under varying load conditions.

Suitable for

• Two-pipe hydronic heating systems in residential and commercial buildings
• Protection and stabilisation of thermostatic and motorised radiator valves
• Hydraulic balancing of manifolds and multi-branch radiator circuits
• Boiler return line bypass to prevent excessive differential pressure

Key specifications

• Type: bypass body for two-pipe heating systems
• Function: controlled bypass flow between supply and return
• Application: radiator circuits, manifolds, boiler connections
• Compatibility: designed for use in closed hydronic heating loops
• Installation: inline connection between supply and return lines

How to use

Install the bypass body inline between the supply and return pipes at a location recommended by the system designer or installer, typically near manifolds or the boiler return. Ensure pipework is depressurised and drained before fitting. Secure connections with appropriate fittings and check for correct orientation according to flow direction. After installation, refill and vent the system, then verify that differential pressure and valve operation are within expected ranges. Commission the circuit by observing flow conditions across different load scenarios and adjust associated balancing valves if present.

Usage recommendations

Integrate the bypass body during initial installation or retrofit as part of a professional hydraulic balancing procedure. Use alongside correctly sized control valves and follow local codes for pressure and temperature limits. Periodic inspection during routine system maintenance is advised to confirm leak-free connections and proper operation.