GD high vacuum flapper valve is used to put through or cut off the airflow in vacuum pipeline. Applicable medium can be pure air and noncorrosive gases. According to its shaft seal structure, high vacuum flapper valve is classified into GD-J rubber shaft seal type and GD-J(b)bellows shaft seal type. According to its put-through type, it is classified into GD-J angle type and GD-S three-way type with prepumping.
高真空挡板阀主要技术性能 Main Technical Performance
阀门漏率：Valve Leak Rate
高真空挡板阀主要零件材料 Materials of Main Parts
阀体、阀盖、阀杆：铝合金、碳钢或不锈钢 密封件：橡胶、氟橡胶、波纹管(轴封)。 Body, bonnet and stem: aluminium alloy, carbon steel or stainless steel Sealing element: NBR, Viton, bellows(shaft seal)
高真空挡板阀外形及连接尺寸(mm) Overall and Connection Dimensions(mm)