Valve, comprising: - a housing with one or more tubular connection portions, - a control handle connected to the housing and rotatable relative to the housing about a control axis in a plurality of control positions, - a flow control mechanism (3, 5) received in the housing and connected with the control handle, - a plurality of stop seats formed on the housing around the control axis, - a locking body connected to the housing and in contact with the control handle, - a plurality of stopping portions formed by one of said locking body and said handle and movable between a locking position in which the stopping portions engage the stop seats and a release position in which the stopping portions are moved away from the stop seats, - a control surface formed by the other of said locking body and said handle, wherein the handle is translatable with respect to the housing and with respect to the locking body along the control axis between a position lowered towards the housing and a position raised from the housing, wherein, when the handle is moved to the raised position, the stopping portions and the control handle are torsion-resistingly coupled around the control axis and the control surface pushes the stopping portions in the locking position, wherein, when the handle is moved to the lowered position, the control surface is positioned to allow the stopping portions to return to the release position, characterized in that: - the stopping portions are formed in a plurality of elastically flexible beams, - the beams and the control surface are positioned and shaped in such a way that, in response to the translational motion of the handle along the control axis, the control surface rests against and loads the beams in the radial direction to the control axis and the beams flex in the radial direction and, in the locking position, the stopping portions are meshed in radial direction with the stop seats. - a housing with one or more tubular connection portions, - a control handle connected to the housing and rotatable relative to the housing about a control axis in a plurality of control positions, - a flow control mechanism (3, 5) received in the housing and connected with the control handle, - a plurality of stop seats formed on the housing around the control axis, - a locking body connected to the housing and in contact with the control handle, - a plurality of stopping portions formed by one of said locking body and said handle and movable between a locking position in which the stopping portions engage the stop seats and a release position in which the stopping portions are moved away from the stop seats, - a control surface formed by the other of said locking body and said handle, - the stopping portions are formed in a plurality of elastically flexible beams, - the beams and the control surface are positioned and shaped in such a way that, in response to the translational motion of the handle along the control axis, the control surface rests against and loads the beams in the radial direction to the control axis and the beams flex in the radial direction and, in the locking position, the stopping portions are meshed in radial direction with the stop seats.