Fluid valve and method for controlling supply of fluid

The invention relates to a fluid valve (1), which has a first valve assembly (5) having a valve needle (7) and an electromagnetic actuating device (8). According to the invention, the electromagneticactuating device (8) has an armature (10), which is coupled to the valve needle (7), and a pole piece (11). The armature (10) has an armature locating surface (15) on an armature locating side (14) opposite the pole piece (11), and the pole piece (11) has a pole piece locating surface (17) on a pole piece locating side (16) opposite the armature (10). For advantageous further development, according to the invention, the first valve assembly (5) has a deformable first ring element (19) and a deformable second ring element (20), wherein, when viewed along the longitudinal center axis (L), an inner contour (23) of the first ring element (19) extends outside an outer contour (24) of the second ring element (20). The invention further relates to a method for controlling the supply of fluid by means of a fluid valve acc