VALVE DEVICE OF DRILL STRING Russian patent published in 1995 - IPC

FIELD: mining. SUBSTANCE: valve device of drill string includes hollow body, inlet valve located in body hollow and having axial and radial channels and circular flexible collars for hydraulic communication between hollows of upper and lower parts of drill string, and filling valve with channels for hydraulic communication of hollow of drill string with drill string-boreholeannulus. Valve device has seat secured to body and located under flexible collar. Filling valve is spring-loaded poppet type and installed in seat which has outlet channels and channels of filling valve. Body has radial channels whose hollow is communicated with hollow of channels of filling valve by means of bore on seat outer surface. EFFECT: higher efficiency. 2 dwg