A valve for control of a fluid flow including a valve housing, fluid control means arranged inside the valve housing, shaft means having a first shaft friction surface and a second shaft friction surface arranged in a mutual shaft friction surface angle, where the fluid control means is arranged to be displaced along a rotational axis of the shaft means in accordance with a rotation of the shaft means, and collar means having a first collar friction surface and a second collar friction surface arranged in a mutual collar friction surface angle, where the collar friction surfaces are arranged to mesh with the shaft friction surfaces, and where the shaft friction surface angle and the collar friction surface angle are between 120° and 170° and the collar means are fixed inside the valve housing.