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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主要技術性能 Main Technical Performance
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適用范圍：Applicability
105～1.3×10-4Pa（軸封為橡膠） 105～1.3×10-5Pa（軸封為波紋管）
閥門漏率：Valve Leak Rate
≤1.3×10-4Pa.L/S.（軸封為橡膠） ≤1.3×10-5Pa.L/S.（軸封為波紋管）
適用溫度：Applicable Temperature
-25～+80℃（丁腈橡膠） -30～+150℃（氟橡膠）
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主要零件材料 Materials of Main Parts
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閥體、閥蓋、閥桿：鋁合金、碳鋼或不銹鋼 密封件：丁腈橡膠、氟橡膠、波紋管（軸封）。
Body, bonnet and stem: aluminium alloy, carbon steel or stainless steel Sealing element: NBR, Viton, bellows（shaft seal）
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