INTRODUCTION

Urban drainage system is an engineering facility system for treating and removing urban sewage and rainwater. It is an integral part of urban public facilities. Urban drainage system planning is an integral part of urban master plan. Urban drainage system is usually composed of drainage pipeline and sewage treatment plant. In the case of separate system of sewage and rainwater, the sewage is collected by the drainage pipe and sent to the sewage treatment, and then discharged into the water or recycled.

Drainage valve is an indispensable water industry product in urban drainage system. which is mainly used in urban, construction, enterprise water supply and drainage engineering, industrial and domestic sewage treatment, water conservancy engineering and other fields. Among them, various types of medium and low pressure valves are mainly used, including various butterfly valves and gate valves. Other valves include ball valve, check valve, exhaust valve, plug valve, diaphragm valve, pressure reducing valve, flow regulating valve and sludge discharge valve Etc. The drainage valve can also be used for the drainage of the sewer pipe to effectively control the water level.

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