The present technical specifications apply to check valves with axial movement of the shut-off body, shockless, with return spring, designed for operation as safety devices preventing backflow of natural, petroleum and artificial hydrocarbon gases in the pipelines of technological lines, technological pipework of compressor stations, booster compressor stations, underground gas storages and gas pipelines in areas with seismicity up to 9 points inclusive on the MSK-64 scale.
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