Flanged Butterfly Check Valve - Series D6 - DN 100; L=64mm; -10 °C to +100 °C BRA.D6.031

Product detailed description

This flanged butterfly check valve is commonly used in heating, ventilation and air conditioning (HVAC) systems, water distribution networks and pumping stations. It is installed between flanges in systems where backflow prevention is essential. The valve is suitable for applications involving cold and hot water, and it is often found in residential, commercial and industrial buildings. The compact design and robust materials make it ideal for installations where space is limited and reliability is critical. The butterfly disc ensures a tight seal when the flow stops, preventing reverse flow that could damage pumps or disrupt system performance.

The valve is designed for integration into systems with flanged connections, ensuring secure and leak-free installation. It is particularly suited for systems operating within the temperature range of -10 °C to +100 °C, making it suitable for both heating and cooling applications. The materials used, including cast iron and EPDM sealing, are selected for their durability and resistance to thermal expansion and contraction. The valve is often used in conjunction with other components such as pumps, filters and control valves to maintain system integrity and efficiency.

Technical parameters

Installation and connection

Installation requires positioning the valve between two flanges according to the manufacturer's specifications. The valve must be aligned with the flow direction, as indicated by the flow arrow on the body. The connection size corresponds to DN 100, and the flanges must conform to STN EN 1092-1 standards. It is important to verify that the flange surfaces are clean and free of debris before tightening the bolts. Common installation mistakes include incorrect alignment, which can cause uneven stress on the valve body, and over-tightening the bolts, which may damage the sealing surfaces or the EPDM gasket. The valve can be installed in any orientation, but it is recommended to follow the manufacturer's guidance for optimal performance.

Compatibility and accessories

This valve is compatible with standard flanged piping systems operating within the specified pressure and temperature ranges. It is typically used with cast iron or steel flanges rated for PN 16. No additional accessories are required for standard installation, but it is recommended to inspect the flange surfaces and gasket before installation. No related products are available for this model.

Technical background for designers

The valve operates using a butterfly disc that opens in the direction of flow and closes when the flow stops or reverses. The disc is supported by a stem and is biased by a spring to ensure a tight seal. The body is made of grey cast iron (GJL 250), which provides strength and resistance to thermal stress. The disc is made of ductile cast iron (GJS 400), which offers improved impact resistance and durability. The spring and pin are made of AISI 316 stainless steel, ensuring resistance to corrosion in water-based systems. The EPDM sealing material is compatible with water and provides a reliable seal across the temperature range. The valve is designed to integrate into HVAC systems and water distribution networks, where it prevents backflow and maintains system efficiency. The service life and performance depend on the quality of installation, the condition of the flanges and the operating conditions.

Service and operation

Regular inspection is recommended to ensure the valve remains functional and leak-free. Key checkpoints include verifying the integrity of the sealing surfaces, checking for signs of corrosion or wear on the disc and stem, and ensuring the flange bolts are properly tightened. No specific service intervals are provided, but maintenance should be performed as part of routine system checks. If the valve shows signs of leakage or reduced performance, it should be removed and inspected for damage or wear. The EPDM gasket should be replaced if it shows signs of degradation or cracking. The valve should be cleaned with a mild detergent and water, avoiding abrasive materials that could damage the sealing surfaces.

Frequently asked questions

Can this valve be installed in a vertical position?
Yes, the valve can be installed in any orientation as it is not sensitive to gravity. The flow direction must still be followed as indicated on the body.

What is the minimum pressure required to open the valve?
The valve requires a minimum opening pressure of 0.1 bar to ensure the disc lifts and allows flow.

What is the minimum backpressure required to close the valve?
The valve requires a minimum backpressure of 0.1 bar to ensure the disc closes and prevents reverse flow.

Is this valve suitable for use with hot water systems?
Yes, the valve is rated for operation up to +100 °C, making it suitable for hot water systems in heating and HVAC applications.