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. Materials of main parts" Body bonnet and stem
CF8 Sealing element:NBR ,Viton,bellow(shaft seal)
Applicability：**5~1.3×***5 Pa Valve Leak Rate：≤1.3×***5Pa.L/S
Applicable Temperature：**5~**0℃(NBR) *0~***0℃(viton)
