Flanged Check Valve - Series 05 - DN 125; L=200mm BRA.F5.000

Product detailed description

This flanged check valve is commonly used in commercial and industrial buildings to prevent reverse flow in heating and cooling circuits. Installers and service technicians typically encounter these valves in closed-loop systems such as underfloor heating, domestic hot water circuits, and central heating applications. The valve is designed for installation in any orientation and is frequently found in systems where unidirectional flow is critical to maintain system integrity and efficiency.

Its compact design allows for installation in tight spaces, while the flanged connections ensure secure and leak-free integration into piping systems. The valve is particularly suited for environments where thermal expansion and contraction are common, making it ideal for use in both new builds and retrofit projects. The operating temperature range of -10°C to +100°C makes it suitable for both cold and hot water applications, including those involving glycol mixtures up to 50% concentration.

Technical parameters

Installation and connection

Installation begins with verifying the correct orientation of the valve according to the direction of flow indicated on the body. The flanged ends must be aligned with the mating flanges on the pipe, and the gasket should be placed correctly between the flanges to ensure a tight seal. Bolts should be tightened evenly in a star pattern to avoid warping the flange faces. It is essential to ensure that the flange faces are clean and free from debris before tightening.

Common installation errors include incorrect orientation, which can lead to improper sealing and premature failure, and over-tightening the bolts, which can damage the flange or gasket. After installation, the system should be tested for leaks under normal operating conditions. The valve is not suitable for steam applications and must not be used in such systems.

Compatibility and accessories

This valve is compatible with standard PN 16 flanged piping systems and is intended for use with cast iron or steel flanges conforming to STN EN 1092-1. For optimal performance, it should be paired with high-quality gaskets and bolts suitable for the operating conditions. No additional accessories are required unless specified by the system design. Related products include other flanged check valves from the same series and complementary isolation valves for system maintenance.

Technical background for designers

The operating principle of this check valve relies on the differential pressure across the disc to open or close the flow path. When flow is in the correct direction, the disc lifts off the seat, allowing media to pass through. When flow reverses, the disc returns to the seated position, sealing the valve. The cast iron body provides good mechanical strength and resistance to thermal stress, while the NBR sealing ensures a durable and flexible seal.

Integration into a system requires careful consideration of the flow velocity and pressure drop across the valve. High flow velocities can increase wear on the disc and seat, reducing the service life of the valve. The material combination is well-suited for water-based media with glycol additives but is not recommended for steam or aggressive chemical environments. Proper alignment and support of the piping system also contribute to the valve’s long-term performance.

Service and operation

During regular system inspections, the valve should be checked for signs of leakage, corrosion, or blockage. The flange bolts should be inspected for tightness, and the gasket should be replaced if damaged or degraded. The valve does not require scheduled maintenance intervals, but it should be visually inspected during routine service checks. If the valve fails to close properly or shows signs of internal erosion, it should be removed and replaced to prevent system contamination or inefficiency.

Frequently asked questions

Can this valve be used in systems with glycol solutions?
Yes, it is suitable for water with up to 50% glycol content, but not for steam or highly aggressive fluids.

Is this valve suitable for installation in vertical pipelines?
Yes, it can be installed in any orientation, including vertical positions, as long as the flow direction is respected.

What is the maximum operating temperature?
The valve is rated for continuous operation up to +100°C, with a minimum operating temperature of -10°C.

Can it be used in potable water systems?
Yes, it is certified for potable water applications and complies with relevant standards for drinking water use.