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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gd型高真空挡板阀主要技术性能 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)
