特性：中心臂双向开启型，90°止动装置，两段速度调整。
Featues:Cental-am bidiectional opening style,90° stopping device,two-segment speed egulation
1.本产品经国家技术监督部门检定，品质稳定运转正常，符合QB/T3884-1999技术标准。
2.采用低温防冻抗磨液压油，保证在零下40度气温下不影响闭门速度。
1.The quality has been authoized by the National Suveillance Depatment,and it can woks nomally;it also each the Technologic standad of QB/T3884-1999.
2.Low-tempeatue,anti-icing hydaulic oil used,ensuing nomal closing speed unde -40° ai tempeatue.
