Flanged Check Valve - Series 05 - DN 50; L=100mm BRA.F5.000

Product detailed description

Flanged check valves are essential components in fluid systems where unidirectional flow must be maintained. They prevent backflow in heating, ventilation and air conditioning (HVAC) systems, water supply lines, compressed air circuits, and hydrocarbon applications. Installers working in commercial and industrial buildings often encounter these valves in boiler systems, central heating loops and air handling units. The valve ensures that fluids or gases flow in one direction only, preventing reverse flow that could disrupt system performance or damage equipment.

This model is designed for use in closed-loop systems where media such as water with up to 50% glycol content, air, oil or hydrocarbons are transported. It is commonly found in systems operating within temperature ranges from -10°C to +100°C. The valve’s construction allows for installation in any orientation, making it suitable for complex piping layouts where space constraints exist.

Technical parameters

The nominal diameter (DN 50) defines the size of the pipe connection, while the nominal pressure (PN 16) indicates the maximum pressure rating under which the valve can operate safely. These parameters are critical for ensuring proper sizing and compatibility with the rest of the system. The material composition—cast iron body and brass disc—ensures durability in moderate temperature environments.

Installation and connection

Installation requires secure flange connections using PN 16-rated flanges in accordance with STN EN 1092-1 standards. Ensure that the flange surfaces are clean and free from debris before tightening the bolts evenly to avoid misalignment. The valve can be mounted horizontally or vertically, depending on the system layout. A minimum backpressure of 0.1 bar is required for the valve to close properly. Common installation errors include incorrect flange alignment, over-tightening of bolts, or using incompatible gaskets, which can compromise the seal and lead to leaks.

Compatibility and accessories

This valve is compatible with standard flanged piping systems operating within the specified pressure and temperature range. For installation, ensure that matching flanges and gaskets conform to PN 16 standards. Additional components such as bolts, nuts and sealing washers should be selected based on the system’s requirements and environmental conditions.

Technical background for designers

The operating principle of the valve relies on a disc that opens under forward flow and closes under reverse flow. The cast iron body provides structural strength, while the brass disc and guide offer resistance to wear. The NBR sealing material ensures a tight closure even in fluctuating flow conditions. The valve integrates into larger systems by maintaining flow direction and reducing the risk of backflow-induced damage. Long-term performance depends on the media composition, flow velocity and system cleanliness.

Service and operation

Regular inspection is recommended to ensure the valve remains free from debris and operates smoothly. Check the flange connections for signs of leakage or bolt loosening. If the valve fails to close properly, disassemble and inspect the disc and sealing surface for wear or contamination. No specific service intervals are provided, but maintenance should be performed according to the system’s operational demands and observed performance.

Frequently asked questions

Can this valve be used in steam systems?
No, this model is not suitable for steam applications as it is designed for water, air, oil and hydrocarbons only.

Can the valve be mounted vertically?
Yes, it can be installed in any orientation, including vertical, as long as the flange connections are aligned correctly.

What is the minimum pressure required to close the valve?
A minimum backpressure of 0.1 bar is required for the valve to close properly and prevent reverse flow.