DIN EN 12050-4-2001 建筑物和施工场地废水提升装置.制造和试验原理.第4部分:无粪便废水和含粪便废水单向阀
Wastewater lifting plants for buildings and sites - Principles of construction and testing - Part 4: Non-return valves for faecal-free wastewater and wastewater containing faecal matter; German version EN 12050-4:2000
The document applies to non-return valves used in conjuction with faecal-free wastewater lifting plants. It contains general requirements, basic construction and testing principles together with information on materials and quality surveillance.#,,#