All PVC or CPVC bleach ball valves must be of the True Union type with an energized seat that will concurrently provide automatic adjustment for wear and leak-free service at the lower pressure port.

• 所有PVC或CPVC漂白剂球阀的制造商必须在进行工厂组装、测试和阀门包装之前全部完成所有的部件的生产。由任何制造商或供应商组装的阀门改进型是不能接受的。