Recently, we have delivered a MAG-S type transfer line check valve for an ethylene application, which is designed and build to our customers requirements. Our first valves for this field of application were already delivered in the 1980´s. Since then, we proudly became the market leader for transfer line check valves for ethylene cracker application. Our valves MAG and HTK, working as check valve and tight shut-off valve in transfer and decoke lines, can be fitted with diverse actuators and additional features. The recently delivered MAG-S has been fitted with an additional steam purged bushing but features like a flow detector, seat purging and an auto close feature (only MAG-S) are implemented as standard.