The invention relates to a fluid valve for influencing a fluid flow, comprising a valve housing (4) in which an actuator (5) is received that can be moved between a first and a second functional position, a fluid channel (7) which, in some sections, extends through said valve housing (4) and opens out at a valve seat (8) in the valve housing (4), and a sealing means (9) that is motionally-coupled to the actuator (5) and designed to temporarily seal off the valve seat (8) depending on the functional position of the actuator (5). According to the invention, a plastically-deformable adjustment means (11; 31; 41; 51; 61) is associated with, and designed to act on, said actuator (5) so as to allow a position of the sealing means (9) to be adjusted in at least one of the functional positions of the actuator (5), said adjustment means being designed as a repositionable abutment for the actuator (5) or for a coupling element that is arranged between said actuator (5) and sealing means (9) for the purpose of motion-coupling.