A fluid injector for an internal combustion engine, wherein the fluid injector comprises a valve housing which forms a valve cavity inside the valve housing comprising an inlet opening and an outlet opening for fluid flowing through the fluid injector when the fluid injector is in operation, a valve needle assembly which comprises an armature and a valve needle, which is arranged inside the valve cavity and which is displaceable with respect to the valve housing to inhibit or to allow the fluid flow out of the fluid injector, and an actuator assembly which is configured to displace the valve needle, characterised in that the fluid injector further comprises a pressure compensator element, wherein the pressure compensator element extends along a central longitudinal axis and comprises: - a containment ring which comprises an elastic material and is configured to deform elastically when the pressure acting on the pressure compensator element changes; - a first ring which is arranged at or in the containment ring at a first portion of the containment ring and extends out of the containment ring; - a second ring which is arranged at or in the containment ring at a second portion of the containment ring and extends out of the containment ring, wherein the second portion of the containment ring is arranged at a different axial position at the containment ring with respect to the first portion of the containment ring, so that an elastic deformation of the containment ring due to a change of the pressure acting on the pressure compensator element results in an axial displacement of the first portion of the containment ring with respect to the second portion of the containment ring and therefore in an axial displacement of the first ring with respect to the second ring, wherein the pressure compensator element is arranged in the valve cavity, and wherein the first ring of the pressure compensator element is configured to engage with a valve cavity surface and the second ring is configured to engage with the valve needle assembly, wherein the first portion of the containment ring is arranged further towards the inlet opening than the second portion of the containment ring so that the elastic deformation of the containment ring due to a change of the pressure of the fluid acting on the pressure compensator element inside the valve cavity results in a lifting force from the pressure compensator element to the valve needle assembly when the valve needle is in a closed position. - a containment ring which comprises an elastic material and is configured to deform elastically when the pressure acting on the pressure compensator element changes; - a first ring which is arranged at or in the containment ring at a first portion of the containment ring and extends out of the containment ring; - a second ring which is arranged at or in the containment ring at a second portion of the containment ring and extends out of the containment ring, wherein the second portion of the containment ring is arranged at a different axial position at the containment ring with respect to the first portion of the containment ring, so that an elastic deformation of the containment ring due to a change of the pressure acting on the pressure compensator element results in an axial displacement of the first portion of the containment ring with respect to the second portion of the containment ring and therefore in an axial displacement of the first ring with respect to the second ring, wherein the pressure compensator element is arranged in the valve cavity, and wherein the first ring of the pressure compensator element is configured to engage with a valve cavity surface and the second ring is configured to engage with the valve needle assembly, wherein the first portion of the containment ring is arranged further towards the inlet opening than the second portion of the containment ring so that the elastic deformation of the containment ring due to a change of the pressure of the fluid acting on the pressure compensator element inside the valve cavity results in a lifting force from the pressure compensator element to the valve needle assembly when the valve needle is in a closed position.