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Days of professional production safety valve valve, ball valve, control valve and other products. 天和阀门专业生产安全阀，球阀，调节阀等产品。
The first major evolution to the True Union Ball Valve, Model-B, introduced the Tru-Bloc concept, a functional safety feature. True Union球阀的第一次重大改进是型号B，引进了Tru-Bloc的设计理念，一种更加安全的性能。
Round Safety Handle –Design prevents accidental operation of low-torque ball valve by snagging the lever handle with personal clothing or equipment. 圆形安全手柄 –这种结构用于防止由于人员服装或设备绊住水平手柄导致的低扭矩阀门的操作故障。