性能描述PERFORMANCE SPECIFICATION       ■0°门扇关闭                            ■Closed at 0°■90°可定位                               ■With 90°stop-device■大开启角度135°                ■MAX open degree 135°■0°-90°可自动复位至0°   ■0°-90°back to 0°automatically■105°-90°为缓冲区                ■Buffer Area control：105°-90°■关门为两段调速：                  ■2 section speed adjustment valve：■一速90°-20°                     ■closing speed adjustment valve：90°-20°■第二速20°-0°                       ■latching speed adjustment valve：20°-0°