HYDRAULIC DISTRIBUTION VALVE WITH INTEGRAL SEALS Russian patent published in 2010 - IPC F16K11/07 F15B13/02 

FIELD: machine building.

SUBSTANCE: hydraulic valve comprising several ports communicating to relief channel (5) and slide valve (8) arranged with the possibility of displacement for control of communication between channels. Slide valve has side transverse seal (13) arranged as a whole with slide valve and engaged with relief channel. In one position valve slide (8) isolates the first port (9) from the second port (10). In another position of slide, transverse seal (13) interacts with the first port (9) and provides for communication between the first port (9) and the second port (10) by means of channel (14) arranged inside slide valve. Slide valve includes the first and second sections (8a and 8b) with various efficient area of cross section, besides at each section sealing element (16, 17) arranged as a whole forms radial seal between slide and relief valve (5).

EFFECT: using supply port, working fluid pressure is maintained outside the slide valve so that force is provided trying to close the valve as a result of various areas of cross section.

11 cl, 4 dwg