A mass-exchange contact device is proposed, comprising upper and lower flat ring-shaped trays attached to a column, a sleeve having windows with bottom edges in the plane of the lower tray, a barbotage unit having orifices in its sidewalls placed on the top sleeve, a movable double-acting valve including upper and lower plates connected with a rod. The barbotage unit includes an ascending limiter of valve's movement, the sleeve's bottom includes a descending limiter. Alternatively, the barbotage unit is made as a portion of the sleeve. Embodiments comprise a number of rows of the proposed devices situated one above the other, and separated by multi-layer packing fittings. The devices can be used in catalytic distillation columns, wherein the fittings are filled with catalytic material. Alternatively, the fitting is substituted with a grating supporting a catalytic granular layer. The proposed design improves device operation, reliability, durability, reduces its weight and costs.