GD型高真空擋板閥用于接通或切斷真空管路中的氣流。適用介質為凈空氣和非腐蝕性氣體。高真空擋板閥按軸封結構可分GD-J型橡膠軸封和GD-J(b)型波紋管軸封兩種。按通導形式可分GD-J為角通型式，GD-S為帶預抽口的三通型式。 ■ GD High Vacuum Flapper Valve ■ 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. ■ 主要技術性能 Main Technical Performance ■ ■ ■ 　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) ■ 主要零件材料 Materials of Main Parts ■ ■ 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)