The invention relates to a medical-technology valve device for suction and / or flushing lines of
medical instruments, particularly instruments for
endoscopic surgery, having a valve housing equipped with a through bore-hole and having a valve body, movably positioned in the valve housing, by which valve body the through bore-hole can be locked and opened again, and where the valve body is configured as a
piston that can be displaced essentially perpendicularly to the through bore-hole by means of a
servo drive, so that a rotary movement of the
servo drive can be transformed into an axial movement of the
piston. To produce a medical-technology valve device that makes possible a reproducible adjustment of the flow volume that is to be regulated, while allowing a reduction of turbulence, it is proposed with the invention that the
servo drive is configured as a hand lever that can rotate around the longitudinal axis of the
piston and can be displaced to move the piston from the position that frees the through bore-hole into the position that closes the through bore-hole by an angle of 90 degrees with respect to the longitudinal axis of the piston.