Description
To address all this, we developed an inner cover with an arc-shaped silicon flap that blocks sewage odors and hydrogen sulfide while releasing air pressure during heavy rain, along with a high-ventilation grating-type manhole cover.
Using this inner cover and manhole cover together makes it possible to prevent odors and hydrogen sulfide during dry weather while managing air pressure buildup in pipelines during heavy rainfall.
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Rust-Proof/Odor-Proof Pressure Relief Device
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Installation completed
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New Pressure Relief Manhole Cover (for roadways)
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New Pressure Relief Manhole Cover (for sidewalks)
Track Record
As of the end of FY2023, 970 units have been installed nationwide, including 91 in Tokyo’s 23 wards.
This technology was co-developed with Hinode, Ltd.