Non-return valves for waterworks purposes - Swing check and tilting disc
水厂用止回阀.旋启式止回阀和倾斜阀瓣
2001-02-27
CECS 132-2002
给水排水多功能水泵控制阀应用技术规程(附条文说明)
Technical specification for application of multi-function control valve for pumping systems of water and wastewater engineering