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.
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主要技术性能 Main Technical Performance
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适用范围：Applicability
105～1.3×10-4Pa（轴封为橡胶） 105～1.3×10-5Pa（轴封为波纹管）
阀门漏率：Valve Leak Rate
≤1.3×10-4Pa.L/S.（轴封为橡胶） ≤1.3×10-5Pa.L/S.（轴封为波纹管）
适用温度：Applicable Temperature
-25～+80℃（丁腈橡胶） -30～+150℃（氟橡胶）
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主要零件材料 Materials of Main Parts
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阀体、阀盖、阀杆：铝合金、碳钢或不锈钢 密封件：丁腈橡胶、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）
