Horizontal flanged check valve - M6 stainless steel series with spring - DN 125; L=29mm BRA.M6.623 PR

Product detailed description

Horizontal flanged check valves are essential components in heating, ventilation and air conditioning (HVAC) systems, ensuring that fluids flow in one direction only. These valves are commonly used in closed-loop water circuits, such as those found in commercial and industrial buildings, where system integrity and flow control are critical. Installers working on boiler systems, heat pump circuits or chilled water loops will encounter these valves in applications where backflow could compromise system performance or safety.

Correctly sized and installed, these valves prevent reverse flow in pressurised systems, particularly in systems with variable flow rates or pump shutdowns. The horizontal orientation of the valve ensures that the disc remains in the correct position for reliable sealing, even in fluctuating operating conditions. The stainless steel construction provides corrosion resistance, making it suitable for use with glycol mixtures and other non-aggressive media.

Technical parameters

Material - body	Stainless steel A351 CF8M
Nominal diameter	DN 125
Nominal pressure	PN 6
EAN	8595145910243
Weight	3.653 kg
Code	M6623125
Brand	IVAR

The nominal diameter (DN 125) determines the valve's compatibility with pipe sizes and system flow rates. The nominal pressure rating (PN 6) indicates the maximum pressure the valve can withstand under normal operating conditions. These parameters are essential for ensuring the valve is correctly sized for the system's hydraulic requirements and can operate safely within the specified temperature range of -20°C to +200°C.

Installation and connection

This valve is installed between flanges according to EN 1092-1 standards. The flange connections must be aligned to ensure even load distribution and prevent leakage. The valve is not suitable for steam applications and should not be used in systems with high particulate content. During installation, it is important to verify that the flange surfaces are clean and free of debris to ensure a proper seal. A common mistake is misalignment of the flanges, which can lead to uneven stress on the valve body and premature failure.

Compatibility and accessories

The valve is compatible with flanged piping systems operating at PN6, PN10 or PN16 pressure ratings. It is suitable for use with water, glycol mixtures, compressed air, oils and hydrocarbons. No additional accessories are required for standard installation. The spring-assisted closure mechanism ensures rapid shut-off, making it suitable for systems with frequent flow changes. No related products are specified for this model.

Technical background for designers

The valve operates on a simple principle: when flow is in the forward direction, the disc is lifted by the fluid pressure, allowing flow. When flow stops or reverses, the spring forces the disc back against the seat, sealing the valve. The stainless steel body (A351 CF8M) and spring (AISI 302) provide resistance to corrosion and mechanical wear. The PTFE sealing material ensures low friction and long-term sealing performance. The valve's efficiency is influenced by the fluid's viscosity and the presence of suspended particles, which can affect the disc's movement and sealing capability.

Service and operation

The valve requires minimal maintenance under normal operating conditions. Regular inspections should be carried out to check for signs of wear, corrosion or leakage. The minimum backpressure required for sealing is 0.3 bar. If the system experiences frequent flow reversals or high particulate content, more frequent inspections may be necessary. No specific service intervals are provided in the technical data.

Frequently asked questions

Can this valve be used in systems with glycol mixtures?
Yes, the valve is suitable for water with up to 50% glycol content. The PTFE sealing and stainless steel construction provide compatibility with glycol-based fluids.

Is the valve suitable for steam applications?
No, the valve is not recommended for use with steam. The technical data explicitly states that it is not suitable for steam systems.

What is the minimum pressure required for the valve to close properly?
The minimum backpressure required for sealing is 0.3 bar.

Can this valve be installed in vertical pipelines?
No, the valve is designed for horizontal installation. Vertical installation may affect the disc's positioning and sealing performance.