Abstract: Device for actuating and controlling the movable bottom of a refuse collection or like body, notably in a refuse collection vehicle and for improving the performance of the main functions of such body or vehicle, by providing a uniform compression of the refuse within the body and ensuring a more reliable operation under recompression and ejection conditions, while eliminating the risk of wrong manoeuvres. This device comprises a telescopic-type hydraulic cylinder and piston actuator controlling the movements of said movable bottom, namely the compression of refuse and the development of a retaining force during the ramming of the refuse by the ramming means incorporated in the hinged door at the opposite end of the body. To this end, an automatic valve is interposed in the hydraulic circuit controlling said movable bottom, said valve remaining close as long as the pressure exerted by the refuse ramming means or the pressure exerted by the refuse against said bottom remains below a predetermined value.