CHANGEABLE VALVE UNIT Russian patent published in 2002 - IPC

FIELD: sanitary valves for water supply systems. SUBSTANCE: unit has body installed in hardware seat and provided with set of movable and fixed washers. Bore is made in each washer. Rolling plunger of drive is sealed by sealing rings. Bore of flat washers is made in the form of segment whose height is 0.2 to 0.8 of washer radius. Arrow base of segment arch is displaced from washer center through 0.2 to 0.8 of washer radius. One half of segment chord is formed by arch of inscribed sector with center lying on washer diameter parallel to segment chord. Sector radius is 0.2 of washer radius to point of contact with segment arch. EFFECT: enhanced regulating ability of device due to gradually varying open area of flow section. 3 dwg