The invention relates to a flow rate measurement device (1) for a fire extinguishing apparatus (2) for detecting the flow rate of extinguishing agent or fresh water, comprising a control element (9) arranged on a control rod (11), which control element (9) has a substantially conical section (22), and furthermore comprising a housing (25) surrounding the control element (9), the control element (9) being received in the housing (25) so as to be displaceable in the axial direction (31) of the control rod (11). The control element (9) further comprises a cylindrical subsection (23) which is positioned downstream of the conical section (22) as viewed in the flow direction (15) of the fluid to be measured, in which cylindrical subsection (23) of the control element (9) there is furthermore provided at least one recess (27) which interrupts the shell surfaces (28, 29) of the conical section (22) and the cylindrical subsection (23) of the control element (9).