The computational study in the unloading slot of the control valve Lukáš Mrózek, Ladislav Tajč, Jan Vimmr, Ondřej Bublík, Václav Sláma and Robert Kalista EPJ Web Conf., 180 (2018) 02070 Published online: 04 June 2018 DOI: 10.1051/epjconf/201818002070