W6 Spring-loaded Check Valve - Stainless Steel - DN 15; L=16mm BRA.W6.626

Product detailed description

Spring-loaded check valves are essential components in closed-loop systems such as heating, ventilation and air conditioning (HVAC) installations, water supply networks, pumping stations and chemical processing facilities. They ensure unidirectional flow by allowing media to pass in one direction while preventing reverse flow. Installers and designers commonly encounter these valves in applications where backflow could cause damage to pumps, mix media or disrupt system balance. This model is suitable for water with up to 50% glycol content and is certified for potable water use.

The valve is compact, with a length of 16 mm, and is designed for installation between flanges in systems with nominal pressures of PN 6, PN 10 or PN 16. It is suitable for installation in any orientation, making it adaptable to complex piping layouts. The spring mechanism ensures reliable sealing under minimal differential pressure, making it suitable for low-pressure systems as well.

Technical parameters

Installation and connection

The valve is installed between two flanges, using standard flange connections according to EN 1092-1. Ensure the flange faces are clean and free of debris before tightening the bolts. The valve can be mounted in any position, but the flow direction must be clearly marked and followed. Common installation errors include incorrect orientation (flow against the arrow), insufficient flange tightening and the use of incompatible gaskets or bolts. Always verify the sealing surfaces and ensure the gasket is correctly positioned. After installation, perform a visual inspection and test for leaks under operating pressure if possible.

Compatibility and accessories

This valve is compatible with a wide range of piping systems using stainless steel or carbon steel flanges. It is typically used in conjunction with pumps, filters and control valves in HVAC and industrial settings. When ordering, ensure the flanges, gaskets and bolts match the PN rating and material grade. No specific accessories are required for basic operation, but additional components such as pressure gauges or flow meters may be needed depending on the system configuration.

Technical background for designers

The operating principle relies on a spring-loaded disc that opens under forward flow and closes under reverse flow or low pressure. The stainless steel body (A351 CF8M) offers resistance to corrosion and high temperatures, while the disc and partition are made from the same material. The spring is constructed from AISI 316, providing durability in aggressive environments. The metal-to-metal sealing surface eliminates the need for additional sealing materials, reducing long-term maintenance. Proper integration into the system requires matching the valve's pressure and temperature ratings with those of the surrounding components. System efficiency and service life depend on correct sizing, proper installation and avoiding excessive vibration or pressure surges.

Service and operation

Regular inspection is recommended to ensure the valve remains functional. Check for signs of corrosion, wear on the sealing surfaces and spring fatigue. If the system is exposed to high concentrations of glycol or particulate matter, periodic cleaning may be necessary. No scheduled service intervals are specified in the documentation. In case of suspected malfunction, isolate the system and inspect the valve for blockage, leakage or mechanical failure. Replace the spring or disc only if damaged or worn beyond acceptable limits.

Frequently asked questions

Can this valve be used in a system with glycol-based coolant?
Yes, the valve is suitable for water with up to 50% glycol content, provided the temperature remains within the specified range.

Is the valve suitable for potable water applications?
Yes, the valve is certified for use with potable water and meets relevant standards for drinking water systems.

Can this valve be installed in a vertical position?
Yes, the valve can be installed in any orientation since it does not rely on gravity for operation.

What is the minimum differential pressure required for the valve to open?
The minimum differential pressure is 0.1 bar, which is sufficient for most low-pressure systems.