CI CI UHV ultra high vacuum butterfly valve for switching on or off the airflow in vacuum. Butterfly door operation is completed after two butterfly door closed or open process, there is no positive and negative sides of the valve mounting direction, the valve's pressure range can be broadened to 2x105-6.7x10-7Pa. Applicable medium can be pure air or corrosive gases . Main technical performance Scope: 2x105 ~ 6.7x10-7Pa valve leak rate: ≤1.3x10-7 Pa.L / S (positive and negative) Temperature: -30 ~ + 80 ℃ Installation Status: Any mounting orientation: Any cracking pressure Poor: Recommended value: 1x105Pa; maximum:. 2x105Pa Opening angle: 0-90 ° arbitrarily adjust the shape and connection dimensions (mm) Model DN D Do D1 BH B1 n-Mc CI-63 63 130 110 68 40 165 82 4- M8 CI-80 80 145 125 85 40 173 82 8-M8 CI-100 100 165 145 105 40 183 82 8-M8 CI-160 160 225 200 165 52 220 90 8-M10 CI-200 200 285 260 208 62 245 94 12-M10 CI-250 250 335 310 258 74 280 100 12-M10 CI-320 320 425 395 328 90 330 125 12-M12 CI-400 400 510 480 410 106 360 160