High vacuum Diaphragm valves Features High vacuum Diaphragm valves are used to connect with or to cut off the vacuum system. Mode of connects have looping Flange, quick disconnect Flange, jointing connect pipes I &Ⅱ. The applicable mediums are air and non-corrosive gases. The high vacuum Diaphragm valves of jointing connect pipes I &Ⅱ are best attachment for bromide-lithium refrigeration equipment. Standard of connecting Flange: GB6070、JB919、GB4982