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In the food industry, continuous quality control is a necessity for hygiene, documentation and consistency. The sampling valve is one of the most popular tools for this purpose. It allows you to take liquid samples directly from the production line while the process is running, so you can quality assure taste, appearance and consistency at the same time.
But how does the choice of sampling valve interact with the need for stability, flexibility and hygiene? We take a closer look.
Read on to find out more!
What is a sampling valve and why is it important?
In short, a sampling valve is a valve that provides access to accurate and hygienic samples from a pressurised system. When the valve is opened, a controlled amount of liquid is extracted for analysis in the laboratory.
The function may seem simple, but its role in quality assurance is significant. A representative sample provides a reliable picture of the condition of the medium and makes it possible to detect challenges in good time. In this way, the sampling valve becomes tools that support both production and quality assurance.
With or without flushing – two variants for different needs
Sampling valves are available in two versions: with flushing and without flushing. Both versions are based on the same principle, but they are designed for different needs.
If you choose a model without flushing, it is ideal for production where the tap does not require frequent cleaning. It provides quick access to samples and is suitable when the focus is on simplicity and efficiency.
A tap with flushing is advantageous in environments where hygiene requirements are particularly high – for example, in dairies. The flush function makes it possible to clean the tap without touching the media flow. While the model without flush is simple and time-saving, the version with flush provides the extra security required in productions with strict hygiene standards.
Materials and hygienic design
In food production, hygiene is not a detail. It is a prerequisite. Therefore, the choice of materials and design are key factors when considering sampling valves. They are typically made of AISI 316L stainless steel, which combines high strength with corrosion resistance. The internal surface roughness of ≤ 0.8 µ makes the surface smooth and easy to clean, thereby reducing the risk of bacterial growth.
The seals are often made of PTFE, which provides chemical resistance and long durability. This makes the taps suitable for many different types of production – from breweries and juice production to more demanding environments in the pharmaceutical industry.
To support hygienic processes, the construction has been developed according to EHEDG principles. Recognition from the European Hygienic Engineering & Design Group is proof that the sampling valve meets international standards for food safety.
Choose the right connection
When choosing a sampling valve, it is not just about function and variant. The connection to the system plays an equally important role because it affects installation, service and cleaning.
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A weld end connection is the most permanent solution. The tap is welded directly into the pipe system and thus becomes an integral part of the system. The result is a tight and stable installation that is also easy to keep hygienic, as there are no joints where residues can accumulate. On the other hand, it requires more work and expertise if the tap needs to be replaced or moved at a later date.
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Pipe threads – typically in BSP standard – allow for a more flexible setup. Here, the tap can be screwed on and off as needed, making it suitable for systems where components need to be serviced or replaced regularly. It is a solution that combines the best of both worlds: secure sealing and practical flexibility.
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The clamp connection is the most service-friendly option. It is secured with a clamping ring so that the tap can be quickly removed without the use of tools. This makes it particularly attractive in environments with high hygiene requirements, where cleaning and inspection are frequent – such as dairies and breweries.
In short: weld on provides stability, pipe threads provide flexibility, and clamps provide quick access.
Get our recommendation for your setup
Although it takes up a little space in the overall production plant, the sampling valve plays an important role. It provides access to data that documents the quality of the product and is a practical tool for ensuring that production can run safely and efficiently.
Once you know your requirements for hygiene, cleaning methods and connection type, the choice becomes easier. Our specialists have extensive experience in advising on sampling valves and other process components in the food industry – and we are happy to help you find the solution that best suits your specific plant.
Do you need an assessment of your process line or advice on choosing a sampling valve? Call us on +45 7020 0422 or send an email to inquiry@alfotech.eu, and we will give you our recommendation.