上展式卸料阀应用规范Application of Norms 1:阀门的设计与制造按GB/T 12235-89标准 1:The design and manufacture of standard criteria according to GB 12235-89 2:结构长度按企业标准 2:The structure by the length of the standard enterprise standard 3:连接法兰按JB/T79-1994的规定 3:The connection flanges standard criteria by JB79-1994 4:验试与检验按JB/T 9092-1999的规定 4:Test and test according to GB JB/T 9092-1999 Standard