GENERAL CHARACTERISTICS
DAVINCI FLANGED STATIC BALANCING VALVES are manually operated valves designed to establish, adjust, and verify the required flow rate in individual branches of water-based hydraulic systems. By introducing a controlled pressure drop and setting the valve to a predetermined opening position, the flow can be balanced according to the design requirements during system commissioning.
As a static, pressure-dependent balancing valve, the selected opening remains fixed until it is manually readjusted. Unlike a dynamic balancing valve, it does not automatically compensate for subsequent variations in differential pressure. This makes it particularly suitable for systems with stable operating conditions or installations where flow distribution is checked and adjusted during commissioning.
Its principal advantage is the ability to achieve accurate hydraulic balancing between circuits and branches. Correct balancing helps prevent excessive flow in circuits close to the pump and insufficient flow in more distant sections, supporting more uniform heating or cooling performance and improving overall system stability.
Integrated pressure-measuring points allow the differential pressure across the valve to be measured. Using the corresponding valve setting and flow coefficient data, commissioning technicians can calculate or verify the actual flow passing through the circuit. This facilitates adjustment, troubleshooting, and performance verification without interrupting normal system operation.
The manually operated handwheel provides progressive and precise flow adjustment. Once the required operating position has been established, the setting can be recorded for future commissioning or maintenance work. The valve can also be fully closed when temporary circuit isolation is required.
Available in sizes from DN50 to DN200 mm, the valve body is manufactured from high-strength EN-GJS-500 ductile iron, providing excellent mechanical resistance and long-term durability in demanding water installations.
The external and internal iron surfaces are protected by a fusion-bonded epoxy powder coating with a minimum thickness of 250 μm. This coating provides effective resistance against corrosion and contributes to an extended operating life in heating, cooling, and industrial water circuits.
Flanged connections are available in PN10 and PN16, with dimensions and drilling according to EN 1092-2 and ISO 7005-2. The valve is manufactured in accordance with the applicable requirements of EN 1074 for valves intended for water-service systems. EN 1074 establishes general fitness-for-purpose requirements, while its individual parts address specific valve functions.
Production pressure testing is performed according to EN 12266-1, Leakage Rate A. For the PN16 version, the body is tested at 24 bar, while the seat-tightness test is conducted at 17.6 bar. Versions rated PN10 must be tested at the corresponding pressures applicable to their nominal pressure class. EN 12266-1 defines the procedures and acceptance criteria for production pressure testing of metallic valves.
The standard working pressure ratings are 1.0 MPa and 1.6 MPa, corresponding to PN10 and PN16. The valve is suitable for water service over a stated operating temperature range from −10 °C to +100 °C, subject to the compatibility of the seats, seals, coating, and other internal components. For operation below the freezing point of water, the medium composition and material compatibility must be confirmed with the factory.
DAVINCI FLANGED STATIC BALANCING VALVES are primarily used in central heating systems, chilled-water networks, HVAC installations, district heating and cooling systems, industrial water circuits, heat-exchanger circuits, air-handling units, fan-coil installations, risers, and distribution branches. They are particularly useful where several parallel circuits must receive their specified design flow and where reliable commissioning measurements are required.
Correct valve selection should be based on the design flow rate, available differential pressure, required pressure drop, and valve flow coefficient. The final setting should be verified during commissioning using the manufacturer’s flow charts or suitable measuring equipment. Where system differential pressure varies substantially during normal operation, a dynamic or pressure-independent balancing solution may be more appropriate.