Annulus isolation valve assembly

1. An annulus isolation valve assembly being part of a tubing hanger assembly, the annulus isolation valve assembly comprising:

a valve bore having a fluid mouth;

a sliding sleeve which is arranged in the valve bore and which has an axially extending sleeve bore, wherein the sliding sleeve comprises a radially facing sleeve port;

a hydraulic piston functionally connected to the sliding sleeve;

a primary hydraulic opening chamber disposed on a first side of the hydraulic piston and a primary hydraulic closing chamber disposed on a second side of the hydraulic piston;

a secondary hydraulic closing chamber confined by at least a closed sleeve end portion, a first end of the valve bore, and the valve bore;

wherein the sliding sleeve comprises an axially facing fluid port which is in fluid communication with the radially facing sleeve port;

wherein the radially facing sleeve port is arranged, in the axial direction, between the axially facing fluid port and the closed sleeve end portion; and

wherein the annulus isolation valve assembly is arranged with a vertical or inclined orientation, and that the first end of the valve bore is a lower valve bore end, wherein a fixed insertion sleeve extends into the sleeve bore and defines a wall portion of the primary hydraulic opening chamber, and wherein the hydraulic piston is a collar protruding radially out from the sliding sleeve.

2. The annulus isolation valve assembly according to claim 1 , wherein a piston compensator is in fluid communication with the primary hydraulic closing chamber or the secondary hydraulic closing chamber, and that the piston compensator comprises a position indication means.

3. The annulus isolation valve assembly according to claim 1 , wherein the first end of the valve bore is in a valve body which is attached to a lower portion of a main body of the tubing hanger assembly.