In the chemical industry, standard valves quickly reach their limits—especially when multiple extreme conditions arise simultaneously. That was exactly the case in a recent customer project.
The Challenge
The process window encompasses two contrasting operating conditions: high pressure at low temperatures (70 bar / 50 °C) and high temperatures at low pressure (300 °C / 1 bar). The medium used is terephthalic acid (30%)—a key raw material for PET production that is both corrosive and prone to scaling. Leaks are not an option in this process.
The Solution
A bottom-discharge ball valve with a metal sealing system and a trunnion-mounted ball is used. The metal seal retains its shape even at extreme temperatures and with aggressive media—unlike elastomers. The trunnion-mounted ball absorbs mechanical loads directly via bearings, not via the seal seats, which minimizes wear and ensures a long service life.
The valve is designed for pressures up to 160 bar and temperatures from −10 °C to +300 °C. In terms of materials, a 1.4980 (heat-resistant high-strength) actuator shaft, carbon bearings, Inconel coil springs, and FFKM-HT O-rings ensure chemical and thermal resistance across the entire operating range.
Conclusion
This project demonstrates what is possible when a valve is consistently designed for the process—rather than the other way around. At ATEC, we develop and manufacture all our special ball valves precisely according to this principle: customized, uncompromising, and 100% Made in Germany.