SEALING DEVICE FOR VALVE Russian patent published in 2016 - IPC F16K5/06 F16K5/20 

FIELD: technological processes.

SUBSTANCE: invention relates to pipeline valves, in particular, to sealing devices with double seal in hydraulic systems. Valve seat arrangement (4) in a hydraulic valve (1) provided with a bidirectional seal (5) including first upstream seal (51) and second downstream seal (52) and intermediate axially movable supporting element (53). Supporting element (53) has at a first end, annular first seal supporting surface (531) surrounded by second supporting surface (534) displaced in axial direction towards valve seat (42). Supporting element (53) has, at a second end, an annular second seal supporting surface (532) surrounding first supporting surface (532) displaced in axial direction away from valve seat (42), first supporting surface (532) passes radially outside from inner diameter (ID_s) of supporting element (53). Second supporting surface (534) passes radially inward from external diameter (OD_s) of supporting element (53). First supporting surface (532) is supported by first shoulder (44) provided on holder (41) of valve seat. Second supporting surface (534) is supported by shoulder (21) provided in housing (2) of valve.

EFFECT: higher reliability at high pressures.

9 cl, 6 dwg