Description
LIBRA is a mechanical pressure independent control valve designed to stabilize flow in heating and cooling systems despite varying differential pressure conditions. Its internal ΔP regulator maintains a constant pressure drop across the control element, ensuring accurate modulation. A built in max flow adjustment knob allows precise setting of design flow rates without removing the actuator, with available flow ranges from 375 to 12 500 l/h across DN15–50 sizes. The valve operates at PN16, supports media from -10°C to 120°C, and maintains optimal control performance within a minimum ΔP range of 20–35 k
Pa, depending on model. Constructed from brass or cast iron with EPDM sealing and stainless-steel components, LIBRA provides long-term reliability in FCUs, AHUs, chilled beams and variable-flow hydronic networks, replacing the balancing valve, differential pressure controller and control valve in a single compact device. Key Features
Pressure-independent flow control using mechanical ΔP regulation.
Max-flow adjustment knob with 5 calibrated positions.
DN15–50, PN16, flow range 375–12 500 l/h.
Min ΔP 20–35 k
Pa, max ΔP up to 800 k
Pa.
Media temperature -10…120°C.
Compatible with electro-thermal and electro-mechanical actuators.
Available with or without P/T plugs for commissioning and ΔP measurement. Benefits
Stable flow and consistent coil performance under varying system pressures.
Prevention of overflow conditions.
Faster commissioning by combining three valves in one.
Maintains correct ΔT and improves efficiency.
Full stroke authority for precise modulation at all loads.
Reliable long-term operation with robust mechanical design. Applications
Fan coil units in offices and residential buildings.
Air handling units and HVAC coils.
Chilled beams, radiant ceilings and low-flow terminals.
Variable-flow hydronic systems.
Heating and cooling applications requiring stable control and easy commissioning.
