The present invention relates to a cementing or inflow regulation valve for conducting cementing operations or inflow regulation in a wellbore comprising a casing or tubing (2), wherein the cementing or inflow regulation valve (1) is inserted between the casing or tubing (2), wherein the cementing or inflow regulation valve (1) comprises an inner sliding sleeve valve (3) which in a closed position covers a number of openings (4) through an outer pipe (5) of the casing or tubing (2) and which in an open position uncovers said openings (4), the sliding sleeve valve (3) comprising a releasing means (6) requiring a certain force to be released both from the closed position to the open position, and vice versa. The invention is characterized in that between the sliding sleeve valve (3) and the outer pipe (5) of the cementing or inflow regulation valve (1), when the sliding sleeve (3) is in a closed position, a sealed chamber (12) is formed being filled with a fluid preventing ingress of undesired drilling and formation fluids and solids, sealing elements (10) being provided in the openings (4) of the outer pipe of the cementing or inflow regulation valve (1), preventing ingress of any solids, fluids and cement located inside or outside the casing or tubing (2).