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BOILERS, PUMPS & VALVES I
n process manufacturing applications including pharmaceutical as well as food and beverage production, diaphragm valves support the hygiene imperative. In addition to preventing contamination, diaphragm valve design enables cleaning and sterilisation to meet regulatory standards. While clean in place (CIP) and sterilisation in place (SIP) practices are essential, they demand time and energy.
A hygienic system, comprising tubing and valves, is steam sterilised to over 100°C and is then air cooled to below 45°C where production can resume. The longer each process takes, the lower the system’s production capacity. Increased time also means higher energy use, both with a greater demand on steam generation to reach the required sterilisation level, as well as powering the air cooling system to quickly reduce the temperature. Critical to this process is the choice of valve
body. Though they comprise just a fraction of the system’s total length of tube, even when hundreds might be used, production cannot resume until the valve bodies are cleaned, sterilised, and cooled. This makes the importance of valve body specification much greater than their physical scale might suggest.
HYDROFORMED VALVE BODIES Traditionally, diaphragm valve bodies are forged, where the stainless steel, required for its hygienic properties, is heated and compressed into place. A forged valve body has a longer heat transfer capacity, so a cast design, where the stainless steel is shaped in a mould, is preferable. Faster still, both at heating up and cooling down, is a valve body manufactured
HYDROFORMED DIAPHRAGM VALVE BODIES ARE THE SUSTAINABLE WAY
For fluid control applications in sectors such as pharmaceuticals as well as food & beverage production, manufacturers can increase productivity and reduce costs while helping to meet their sustainability objectives by integrating improved control valves. Hydroformed valve bodies for diaphragm valves achieve high strength and light weight. This makes hydroformed valve bodies far more energy efficient compared to forged or cast designs, and the manufacturing process is inherently more sustainable too. Kieran Bennet, industry manager for Food & Beverage, Chemical & Petrochemical at Bürkert, explains the sustainability advantages of hydroformed valve bodies.
with hydroforming, which involves high pressure fluid to create the design. This can be combined with the processes of annealing that increases durability by relieving residual stress and improving corrosion resistance, as well as laser welding that can establish a hygienic seal without adding any extra material. Together, these manufacturing techniques create a more lightweight valve body design, and this low mass achieves rapid heat transfer. While a forged valve body can take nearly 10 minutes to cool down to 45°C from the
48 Summer 2024 UKManufacturing
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