Abstract: A valve comprises a housing, a control handle rotatable relative to the housing, a flow control mechanism in the housing and connected with the control handle, stop seats formed on the housing, a locking body in contact with the control handle, stopping portions formed in the locking body 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 in the handle. The handle is movable between a lowered position towards the housing and a position raised from the housing. In the raised position, the control surface pushes the stopping portions in the locking position and, in the lowered position, the control surface allows the stopping portions to return in the release position.