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中华人民共和国国家标准通用阀门法兰和对焊连接钢制闸阀Generalpurposeindustrialvalves一Flangedandbutt-weldsteelgatevalvesGB/T12234—891主题内容与适用范围本标准规定了法兰和对焊连接钢制闸阀的结构型式、技术要求等。本标准适用于公称压力PN1.6～42.0MPa，公称通径DN25～600mm法兰和对焊连接的钢制闸阀。.2引用标准GB150钢制压力容器GB152.1～152.4紧固件通孔及沉孔GB196普通螺纹基本尺寸(直径l～600mm)GB197普通螺纹公差与配合(直径1～355mm)GB798活节螺栓GB897双头螺柱bm＝ldGB898双头螺柱bm＝1.25dGB901等长双头螺柱B级GB5782六角头螺栓A和B级GB5796.1～5796.4梯形螺纹GB61752型六角螺母A和B级GB9112钢制管法兰类型GB9113.1～9113.26整体钢制管法兰GB12220通用阀门标志GB12221法兰连接金属阀门结构长度GB12222多回转阀门驱动装置的连接GB12224钢制阀门一般要求GBl2228通用阀门碳素钢锻件技术条件GB12229通用阀门碳素钢铸件技术条件GB12230通用阀门奥氏体钢铸件技术条件GB/T12252通用阀门供货要求ZBJl6006阀门的试验与检验3结构型式闸阀的结构型式如图l所示.1GB/T12234—89国家技术监督局1990–01–04批准1990–12–01实施图1l一阀体；2一阀板；2—阀杆；4—垫片；5—阀盖；6一上密封座；7一螺塞；8一带孔填料垫；9—填料；10—活节螺栓；11—阀杆螺母；12—轴承；13—轴承压盖；14—锁紧螺母；15一手轮；16一油杯；17一支架；18一填料压盖；19一螺栓；20、22一螺母；21一螺柱4技术要求4.1阀体4.1.1法兰连接的结构长度按GB12221的规定。211109876543211213141516171819202122GB/T12234—894.1.2阀体的最小壁厚，当法兰连接尺寸采用GB9112时按表1的规定，采用GB9113时按表2的规定。表1mm公称通径DN公称压力，MPa1.62.54.06.410.016.0壳体最小壁厚256.56.76.97.48.510.4326.97.27.48.09.111.4407.47.77.98.69.912.6507.98.28.59.310.914.0658.79.19.410.412.316.1809.49.910.211.513.718.210010.310.911.312.815.520.915012.11313.715.919.927.720013.514.815.618.724.134.325014.516.217.321.328.040.830015.317.418.823.631.847.235015.918.420.025.835.553.640016.419.321.227.939.159.845016.920.222.430.042.666.150017.621.223.632.046.172.460019.623.726.436.353.285.0注：壳体包括阀体、阀盖。表2mm公称通径DN公称压力，MPa2.05.010.015.025.042.0壳体最小壁厚256.46.47.912.715.1326.46.48.614.217.5406.47.99.315.019.1508.79.51...