GI-KF high vacuum butterfly valve GI-KF high vacuum valve for switching on or off the airflow in vacuum for medium can be pure air or corrosive gases. Main technical performance Scope: 105 ~ 6.7x10-5Pa valve leak rate: ≤1.3x10-5 Pa.L / S Temperature:. -30 ~ + 150 ℃ installation status: any opening angle: 0-90. Major parts material body, butterfly doors, stem: stainless steel Seals: Viton shape and connection dimensions (mm) (GB4982 / ISO-KF) quick release flange connection type DN (mm) A L1 L2 H GI-25 ( KF) 25 30 50 62 60 GI-40 (KF) 40 35 65 85 78 GI-50 (KF) 50 45 85 110 105