Flanged Wafer Butterfly Check Valve - Series D6 - DN 200; L=89mm; -10 °C to +100 °C BRA.D6.031

Product detailed description

Flanged wafer butterfly check valves are commonly used in HVAC systems, water distribution networks, and pumping stations to prevent backflow in pipelines. These valves are installed between flanges in systems where unidirectional flow is required to maintain system integrity and prevent reverse flow from damaging equipment or causing inefficiencies. Installers and technicians working in industrial, commercial, and residential heating and water supply systems will encounter these valves in applications involving circulating pumps, expansion tanks, and closed-loop circuits. The compact design and robust construction make them suitable for both new installations and system retrofits.

The valve is designed for integration into pressurised systems where flow reversal could lead to operational issues or damage. It is particularly useful in systems with variable flow conditions, such as those found in heating and cooling circuits. The valve’s ability to operate in any orientation adds flexibility during installation, reducing the need for additional alignment or support structures.

Technical parameters

Nominal diameter	DN 200
Nominal pressure	PN 16
Weight	14.3 kg
Code	D6031200
Brand	IVAR

The nominal diameter (DN 200) determines the size of the pipeline in which the valve is installed, while the nominal pressure (PN 16) indicates the maximum allowable working pressure. These parameters are essential for correct sizing and selection to ensure the valve can handle the system’s hydraulic conditions without failure. The operating temperature range of -10 °C to +100 °C must also be considered when selecting the appropriate sealing material and structural components.

Installation and connection

The valve is installed between two flanges according to EN 1092-1 standards. The connection size corresponds to DN 200, and the flanges must be PN 16-rated to match the valve’s pressure rating. Before installation, verify that the flange surfaces are clean and free of debris to ensure a proper seal. The valve can be mounted in any orientation, but it is important to align the flow direction with the arrow marked on the body to prevent incorrect installation. Common installation errors include misalignment of the flow direction, improper flange tightening, and failure to check for debris in the flange faces before bolting the valve in place.

Compatibility and accessories

This valve is compatible with standard flanged piping systems designed for PN 16 pressure ratings. It is typically used in conjunction with circulating pumps, expansion vessels, and control valves in HVAC and water supply systems. No additional accessories are required for basic operation, but it is recommended to install a filter upstream to prevent particulate matter from entering the valve and affecting its performance. No related products are specified for this model.

Technical background for designers

The valve operates on a butterfly disc mechanism that opens under forward flow and closes under reverse flow. The disc is made from grey cast iron (GJS 400) and is supported by a stainless steel (AISI 316) spindle and spring. The body is constructed from grey cast iron (GJL 250), and the sealing material is EPDM, which is suitable for the specified temperature range. The valve is designed to maintain a minimum opening pressure of 0.1 bar and a minimum backpressure of 0.1 bar to ensure reliable operation. The material selection ensures durability in systems with moderate chemical exposure and thermal cycling.

Service and operation

The valve requires minimal maintenance due to its robust design and the use of durable materials. However, periodic inspection is recommended to check for signs of wear, corrosion, or leakage. The EPDM sealing material should be inspected for degradation, particularly in systems with high thermal cycling. No specific service intervals are provided in the technical data, but any abnormal noise, vibration, or leakage should be investigated promptly to prevent system downtime.

Frequently asked questions

Can the valve be installed in a vertical pipeline?
Yes, the valve can be installed in any orientation, including vertical pipelines, as it is designed for use in all positions.

Is the sealing material suitable for hot water applications?
Yes, the EPDM sealing material is suitable for temperatures up to +100 °C, making it appropriate for hot water and heating system applications.

What is the minimum pressure required for the valve to open?
The valve requires a minimum opening pressure of 0.1 bar to ensure proper operation and prevent premature closure.

Can this valve be used in a closed-loop heating system?
Yes, the valve is suitable for use in closed-loop heating systems, including those found in HVAC and building services applications.