球阀用带圆形通孔的球体作启闭件,球体随阀杆转动,以实现启闭动作的阀门。球阀是由旋塞阀演变而来，又称球形旋塞阀。球阀的启闭件作为一个球体，利用球体绕阀杆的轴线旋转90度实现开启和关闭的目的。
手动法兰球阀在管道上主要用于切断、分配和改变介质流动方向，设计成O形开口的手动法兰球阀还具有良好的流量调节功能。手动法兰球阀只需要用旋转90度的操作和很小的转动力矩就能关闭严密。完全平等的阀体内腔为介质提供了阻力很小、直通手动法兰球阀的流道。手动法兰球阀不仅结构简单、密封性能好，而且 在一定的公称通经范围内体积较小、重量轻、材料耗用少、安装尺寸小，并且驱动力矩小，操作简便、易实现快速启闭，易于操作和维修，适用于水、溶剂、酸和天 然气等一般工作介质，而且还适用于工作条件恶劣的介质，如氧气、过氧化氢、甲烷和乙烯等。手动法兰球阀阀体可以是整体的，也可以是组合式的。公称通径DN主要外形尺寸和连接尺寸 (mm)WTLDD1D2bZ-φdHWQ41F-16C    15130956545144-14781403201401057555144-14841604251501158565144-149518053216513510078164-1815025094018014511085164-181503001150203160125100164-181703501565222180145120184-181953501980241195160135208-1821540027100305215180155208-1825050038125356245210185228-1826560058150394280240210248-23270800812004573352952652612-23330800952505334053553203012-254501300140浮动式球阀外形和连接尺寸             单位Unit：mm公称通径 DN主要外形尺寸和连接尺寸WTLDD1D2bZ-φdHWQ41F-25    Q41F-25P     15140956545164-141031003201521057555164-141121604251651158565164-1412316063217813510078184-18150250104019014511085184-181562501450216160125100204-181723502065241180145120228-181973502580283195160135228-1822245030100305230190160248-2325345040125381270220188288-2527860065150403300250218308-25286800852005023603102783412-2534012001002505684253703323612-304701400165Q41F-40      Q40F-40P       Q341F-40     Q341F-40P     15140956545164-141031OO3201521057555164-141121604251651158565164-1412316063217813510078184-18150250104019014511085184-181562501450216160125100204-181723502065241180145120228-181973502580283195160135228-1822245030100305230190160248-2325345040125381270220188288-2527560065150403300250218308-25286800852005023753202823812-3034012001002505684453853454212-344701400165Q41F-64     Q40F-64P     Q341F-64      Q341F-64P      151651057555184-141051303.1201901259068204-181251304.92521613510078224-181351607.23222915011082244-231501608.74024116512595244-2316523012.150292175135105264-2317523016.765330200160130288-2320040028.280356210170140308-2321040036100432250200168328-2525070066125508295240202368-30295110098150559340280240388-343401500142