PIPELINE GATE O-RING Russian patent published in 2008 - IPC F16K41/00 

FIELD: engines and pumps.

SUBSTANCE: invention can be used in pipeline shut-off valves and accessories to shut off working medium flow in service pipelines. The gate O-ring incorporates two opposite sealing areas and a side groove formed by three chords, the extreme ones forming with the medium chord an obtuse angle and the height of a segment formed by the chords being equal to the upper limit. The chords intersection apex is located at the lower limit of the groove depth tolerance. The number of grooves is equal to that of O-ring fasteners.

EFFECT: lower labour input in production of O-rings from ceramic materials.