MANUFACTURING METHOD OF SPOOL-TYPE VALVE FOR HYDRAULIC LOAD-BEARING ELEMENT, AND SPOOL-TYPE VALVE Russian patent published in 2013 - IPC F15B13/02 

FIELD: machine building.

SUBSTANCE: in manufacturing method of a spool-type valve for a hydraulic load-bearing element including a metal housing with a sleeve and a spool valve, the sleeve is made from leucosapphire monocrystal, its stress reaches 50÷95% of pressure in the system by its mutual heating with metal housing till design temperature and its pressing into the housing with their further joint cooling. Treatment of inner surface of the sleeve is performed after it is pressed and cooled, and a gap between the sleeve and the spool valve is made in the range of 0.2÷8 mcm. At manufacture of the sleeve and the spool valve their axes and axis 0001 of leucosapphire monocrystal is aligned between them.

EFFECT: higher control accuracy of working medium flow rate.

6 cl, 3 dwg