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Rotation manhole cover / Public facilities

Rotation manhole cover

Used the rotation manhole cover Sanitation workers do not need to open the manhole cover to make rainwater into the sewer,the rotation manhole cover will open because water pressure the rotation manhole cover will open automatically when raining,after raining the the rotation manhole cover loss the water pressure so that will close fainlly.

University

Zheng Zhou University Of Light Industry

Zheng Zhou University Of Light Industry
Zheng Zhou, China

Design

Zheng Zhou University Of Light Industry

Zheng Zhou University Of Light Industry
Zheng Zhou, China

Zhang Yong Ci