Gas regulating apparatus, has capacity unit charging and discharging gas through reduced diameter opening device, where device is mounted in manner for alternatively connecting with pressure zones of apparatus

摘要

The apparatus has a seat device moved between a closing position and an opening position. A gas flowing path between an inlet opening and an outlet opening is closed at a closing position. A capacity unit (24) charges and discharges gas through a reduced diameter opening device (28). The reduced diameter opening device is mounted in a manner for alternatively connecting with different pressure zones of the apparatus located at two sides of an upstream flap (12).