Abstract: A "digital" valve comprises a plurality of shutters (46) connected in parallel between an inlet duct (2) and an outlet duct (42) of the digital valve, with each shutter (46) being constituted by an elementary spherical plug valve (50) capable of transmitting an individual flow rate. These shutters are distributed angularly around the axis of the digital valve and each of them is incorporated in a module (24) received in a standard seating (14, 18), thereby making it easy to remove any of the modules. The invention is particularly applicable to rapidly changing over between different flow rates of a liquid or a gas under the control of a digital electronic system (70).

Abstract: A ball-type valve comprises a rotary valve member in a housing or valve body whose ducts communicating with the passage in the valve member are provided with respective sealing devices. These sealing devices comprise elastomeric formable rings received in blind recesses around the respective ducts and communicating therewith by orifices opening behind each deformable ring so that the fluid pressure in the respective duct under pressure will urge the deformable ring against the annular gasket and press the gasket against the rotary valve member.