Patent ID: 8656945

Claim:
A pressure control valve assembly for containers adapted to contain compressed and liquefied gases, comprising a valve body that can be applied to a container for compressed and liquefied gases, in which a first duct for the gas in output from said container and a pressure regulator device connected to an inside volume of said container and to said first duct are defined, said pressure regulator device being fully placeable within said container, said regulator device comprising at least one flow control piston, said valve body further comprising a seat into which said flow control piston can slide within said seat along an axis coaxial to a longitudinal axis of the container, the pressure control valve further comprising a second duct for connection between said pressure regulating device and the atmosphere outside the container so that an external reference pressure acts on a shoulder of the piston to ensure a constant output pressure from the container, wherein said flow control piston includes two axially adjacent portions of different diameters connected by means of the shoulder on which a spring is active, and wherein a toroidal seat is formed between two cylindrical surfaces to which said portions are respectively coupled in a sliding manner, said second duct connecting the seat to the environment that lies outside said container.