FIELD: mechanical engineering, metallurgy, petrochemical industry. SUBSTANCE: proposed device has buffer vessel installed on contraction device. Buffer vessel is arranged in end of hydraulic line from minus bleed of contraction device. Throttling plate is installed in hydraulic line running from minus bleed of contraction device to buffer vessel. PLUS input of pressure differential sensor is connected with hydraulic line before throttling plate. MINUS input of pressure differential sensor is connected with inner space of buffer vessel. EFFECT: simplified design, improved reliability of antisurge system. 1 dwg
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