Patent ID: 6412750
Filing Date: 2002-07-02
Classification: F16K

Abstract:
A valve system for fluid pipes, comprising:two bodies assembled into a single valve housing, with an internal fluid passage being formed along the central axis of said valve housing, said passage having fluid inlet and fluid outlet openings at both ends thereof and also having an annular fluid guide groove at a position inside the fluid outlet opening, said guide groove having a concave surface; a cylindrical valve body having an axial fluid passing opening therein and a pressure actuated flange on its external surface, said valve body being axially and movably fitted in said fluid passage so as to be reciprocable within a predetermined range in an axial direction of said valve housing, said valve body being reciprocable by external air pressure acting on either side of said pressure actuated flange of the valve body, said air pressure being introduced to the pressure actuated flange through either one of first and second air injection ports of the valve housing; a flanged cylindrical disc provided in the passage at a position within said guide groove, with the valve body being selectively brought into close contact with or being moved away from said disc so as to close or open the passage; a rotor having a plurality of vanes, said rotor being provided in the passage within the fluid inlet opening; a fluid guide rod axially and centrally extending in the passage from the rotor to the disc; and valve control means for selectively moving the valve body toward the fluid inlet or fluid outlet opening of the passage so as to open or close the passage without using air pressure when necessary.