CD ultrahigh vacuum flapper valve CD ultrahigh vacuum flapper valve for turning on or off the airflow in vacuum. Applicable medium can be pure air or corrosive gases. Main technical performance Scope: 105 ~ 6.7x10-7Pa valve leak rate: ≤1.3x10-7 Pa.L / S Temperature: -30 ~ + 400 ℃ installation status: any major parts material body, stem,: stainless steel ; bonnet: special alloy Seals: oxygen-free copper, bellows (seal) Overall and connection dimensions (mm) Model DN D Do D1 D2 AH n- Φc flange standard CD-J16 16 34 27 21.4 18 38 160 6 -Φ4.3 GB6071 / CF CD-J25 25 60 47 39 34 50 185 6-Φ6.6 CD-J40 40 70 58.7 48.3 42 63 210 6-Φ6.6 CD-J50 50 86 72.4 61.6 55.6 80 235 8-Φ8 .4 CD-J63 63 114 92.2 82.4 77 90 260 8-Φ8.4 CD-J80 80 130 110 99 93 100 285 16-Φ8.4