Flanged Butterfly Check Valve - Series D6; Stainless Steel - DN 125; L=70mm BRA.D6.622

Product detailed description

Flanged butterfly check valves are commonly used in heating, ventilation, and air conditioning (HVAC) systems, water supply lines, pumping stations, and for transporting oils and hydrocarbons. These valves prevent backflow in pressurised systems where unidirectional flow is essential. Installers and technicians working in industrial, commercial and residential buildings often deal with such valves during system design, maintenance or expansion. This model is suitable for installation between flanges in accordance with EN 1092-1 standards.

The compact construction allows for mounting in any position, making it adaptable to various pipeline layouts. The valve is designed for use in environments with fluctuating temperatures and moderate pressures. Its stainless steel components ensure resistance to corrosion and wear, making it suitable for both indoor and outdoor applications.

Technical parameters

Nominal Diameter	DN 125
Nominal Pressure	PN 16
Weight	6.668 kg
Code	D6622125
Brand	IVAR

The nominal diameter (DN 125) and pressure rating (PN 16) are essential for determining the valve’s compatibility with existing piping systems. The maximum operating temperature of +100°C and minimum of -20°C define the thermal limits within which the valve can function safely. These parameters are crucial for correct sizing and selection to ensure the valve performs reliably under expected operational conditions.

Installation and connection

The valve is installed between two flanges according to EN 1092-1 specifications. The nominal size of DN 125 corresponds to the internal diameter of the pipe. Ensure that the flange surfaces are clean and free of debris before securing the valve. The butterfly disc opens under forward flow and closes automatically when reverse flow occurs. A minimum differential pressure of 0.1 bar is required for the valve to open properly. During installation, verify that the flange bolt holes align correctly and that the sealing ring is undamaged. Avoid over-tightening the bolts, which could damage the sealing surface or the Viton® ring. A common mistake is installing the valve in a position where it cannot close fully due to misalignment or insufficient clearance. Always confirm that the valve is mounted in the correct orientation for directional flow.

Compatibility and accessories

This model is compatible with standard flanged piping systems using EN 1092-1 flanges. It is suitable for integration with HVAC systems, water supply lines, and pumping stations handling non-aggressive fluids. For optimal performance, ensure that the system includes appropriate supports and that the upstream and downstream piping is correctly aligned. No additional accessories are typically required for installation, though gaskets and sealing compounds may be used depending on site conditions.

Technical background for designers

The butterfly check valve operates by allowing fluid to flow in one direction and preventing reverse flow through the closure of the disc. The stainless steel body and disc offer high resistance to corrosion and mechanical stress. The Viton® sealing ring provides a durable and flexible seal against leakage. The valve is designed for integration into pressurised systems where unidirectional flow is necessary for system integrity. The choice of materials ensures long-term durability in environments with fluctuating temperatures and moderate pressures. The disc is supported by a stainless steel pin and spring, which assist in smooth and reliable operation. Proper alignment with the piping system and correct installation are critical to achieving the valve’s intended service life and efficiency.

Service and operation

Routine checks should include inspecting the sealing ring for wear or damage and verifying the smooth movement of the disc. Ensure that the valve remains free from blockages or deposits that might hinder its operation. If the valve fails to close properly or exhibits signs of leakage, disassemble and inspect the sealing surface and disc for damage. Reassembly should follow the manufacturer’s instructions to maintain performance.

Frequently asked questions

Can the valve be installed vertically or horizontally?
Yes, the valve can be mounted in any position as it is designed for installation in all orientations.

Is a minimum pressure difference required for the valve to operate?
Yes, a minimum differential pressure of 0.1 bar is needed for the valve to open and function correctly.

What is the recommended temperature range for operation?
The valve is suitable for use between -20°C and +100°C.

Does the sealing ring require replacement during service?
The Viton® sealing ring should be inspected regularly and replaced if signs of wear or damage are observed.