Test & measurement
milliseconds and also perform this function. “Reliability and low maintenance costs play a decisive role in the cost-effective operation of a system like Energify. That’s why we rely on a simple design and a robust construction”, explains Aslan. “The sliding gate valve helps us by reducing the complexity of the system – and with a very compact design, too.” The difference to the previous technology is clear: the DN80 Schubert & Salzer sliding gate valve now used weighs a mere 15 kg, whereas the two globe valves previously used weighed together around 170 kg. “That’s an enormous advantage, especially for the annually necessary maintenance work,” Igelbüscher adds.
Sliding gate valve and exploded view (cop- yright for both: Schubert & Salzer Control Systems GmbH):
Sliding gate valves by Schubert & Salzer regulate and switch liquid, vaporous and gaseous media precisely, quickly and eco- nomically.
A sealing disc (3) fixed perpendicular to the flow direction in the body (1) has a certain number of transverse slots. A movable sealing disc (2) with the same slot arrangement is pushed vertically against it, which changes the flow cross-section. The existing pressure difference presses the movable disc (2) against the fixed disc (3).
MORE ECONOMICAL THAN PHOTOVOLTAICS
The Energify demonstration system is located in a dairy in Münsterland, where it is used on the 8-bar steam mains. The cost-effectiveness of the system can be illustrated well here: With an input pressure of 8 bar (g), an output pressure of 5 bar (g) and a steam quantity of 2 t/h on average, an electrical output of 27 kW is achieved. With an annual running time of 6,500 hours, that would produce 175 MWh of power per year. The amortisation time is less than three years under these conditions. Including maintenance costs, over 270,000 Euros could be saved over an operating period of ten years. CFT compares Energify with photovoltaics in a further calculation example: An Energify system with an output of 300 kW that achieves 8,500 operating
38
hours per year would accordingly generate around 2,550 MWh annually – on an area of just 40 m². In order to generate the same amount of energy with photovoltaics, with an annual utilisation time of about 1,000 hours (average in Germany), an area of around 13,500 m² would be necessary. “The technology has enormous potential. Thousands of steam generators are in use in Germany alone. And steam – in whatever form – is only one of the media from which we can produce energy. In principle, Energify can be used with virtually every gas, for instance nitrogen, coke oven gas, natural gas or hydrogen”, Selcuk Aslan concludes.
Schubert & Salzer Control Systems
controlsystems.schubert-salzer.com
January 2026 Instrumentation Monthly
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