Butterfly Valves Challenges in Solar Thermal Systems

The four offset butterfly valve from the manufacturer QUADAX is used worldwide in solar thermal systems and offers important advantages in terms of reliability and cost efficiency.

Solar thermal systems bundle and reflect the sunlight using mirrors until the heat transfer medium is made to circulate. Thermal energy is transferred to vacuum-insulated pipelines and the absorbed solar energy is transferred via heat exchangers to, among other places, conventional steam power plants that drive a generator. The use of HTF (Heat Transfer Fluids) or molten salt offers the advantage over water that high pressures and pipes with large nominal diameters are avoided. The use of HTF or molten salt, however, causes very high temperatures and aggressive conditions in the system. For this reason, an absolutely tight valve made of special materials, meeting the highest tightness requirements and with particularly compact design is required. This is where the innovative QUADAX butterfly valves come in!

The QUADAX butterfly valves used are made of special materials and are equipped with an innovative graphite-free sealing system. Also, at temperatures of +400°C and above, leaks can occur causing environmental damage. Molten salt as a carrier medium is a more environmentally friendly and cost-effective that can be used at temperatures up to +500°C. However, molten salt particles require sophisticated valve designs to avoid deposits.

QUADAX’s innovative four offset butterfly valve with its special feature circular sealing geometry with identical material thickness all around ensures uniform contraction and expansion of the seal, especially when subject to extreme pressure and temperature fluctuations.

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