1AARHArithmeticAverageRoughnessHeight算术平均粗糙度高度2AGSSAngularSeatingSurface角支持面3AMBAmbient环境4ANSIAmericanNationalStandardsInstitute美国国家标准协会5AOAdjustableOpening可调式开6APIAmericanPetroleumInstitute美国石油协会7ASAlloySteel合金钢8ASBAsbestos石棉9ASBRAsbestosRubber石棉橡胶10ASMEAmericanSocietyOfMechanicalEngineers美国机械工程师学会11ASTMAmericanSocietyOfTestingMaterials美国材料及试验学会12AVAngleValve角阀13AWWAAmericanWaterWorksAssociation美国自来水厂协会14BVBallValve球阀15BBBoltedBonnet螺栓连接阀盖16BBEBevelBothEnds两端坡口端17BCBoltedCover螺栓连接阀帽18BEBevelEnd坡口端19BLDBlindFlange盲法兰(法兰盖)20BLSBellowsSealing波纹管密封21BFWBoilerFeedWater锅炉给水22BGBoltedGland螺栓连接填料压盖23BLEBevelLargeEnd大端坡口端24BLKBlank插板(盲板)25BSBritishStandard英国标准26BFVButterflyValve蝶阀27BTVBreathingValve呼吸阀28BWButtWelded对焊29CCarbon/CarbonContent碳/碳含量30CACorrosionAllowance腐蚀裕量31CVCheckValve止回阀32CICastIr