Valve assembly with a guiding element and fluid injector

A fluid injector, comprising:

• a valve assembly comprising:
• a valve body having a longitudinal axis and comprising a cavity with a valve seat, wherein the cavity is limited by a wall of the valve body,
• a valve needle received in the cavity,
• wherein the cavity and the valve needle interact to prevent an injection of fluid from the cavity in a closing position of the valve needle in which closing position the valve needle is seated on the valve seat, and to enable the injection of fluid from the cavity in an open position of the valve needle in which the valve needle is spaced apart from the closing position of the valve needle, and
• a first guiding element that axially guides the valve needle,
• wherein the first the first guiding element is:
• bottle shaped and being axially deformable at least in part,
• fixedly coupled to the valve needle in a bottle neck section of the first guiding element,
• coupled to the wall of the valve body in an axial end section of the first guiding element remote from the bottle neck section, and
• arranged such that an axial displacement of the valve needle away from the closing position of the valve needle results in a widening of an outer shape of the first guiding element at least in a fixation section to thereby press the first guiding element against the wall of the valve body, and
• an actuator assembly configured to exert a force that displaces the valve needle away from the closing position, wherein the first guiding element provides a force that biases the valve needle towards the closing position, and wherein the actuator assembly is configured to displace the valve needle against the bias of the first guiding element.