阀门标准 BS 1212-3-1990 Float operated valves. part 3 Specification for diaphragm type float operated valves (plastics bodied) for coldwater services only.pdf [db:摘要]
阀门标准 BS EN 1567-2000 Building valves. Water pressure reducing valves and combination water reducing valves. Requirements and tests.pdf [db:摘要]
