Reduced port Ball valves are not recommended in building services piping, but rather for process piping in hazardous material transfer.
缩径流道球阀不推荐在建筑物管道系统中使用，但是可用于有害物质传输的处理管道。
Valves serve the purpose of controlling the fluids in building services piping. Valves are produced in a variety of design types and materials.
在建筑物管道系统中，阀门起着控制流体的作用。由于结构和材质的不同，因此制造出的阀门也就各不相同。
Valves serve the purpose of controlling the fluids in building services piping. Valves are produced in a variety of design types and materials.
在建筑物管道系统中，阀门起着控制流体的作用。由于结构和材质的不同，因此制造出的阀门也就各不相同。
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