Watertight sealing system with relief valve for manhole having a

Details Watertight sealing system with relief valve for manhole having a Watertight sealing system with relief valve for manhole having a

1996-06-26

1998-04-28

Neuder, William P.

Road structure, process, or apparatus

Pavement

Vault cover-closure

52 20, E02D 2914

Patent

active

057436738

ABSTRACT:
A sealing assembly for sealing a manhole against entering liquid includes a support ring fixed to the manhole's skirt and a sealing member resting on the support ring. The sealing member has a base with a foam ring under it, and pressing members on top of it for pressing the base against the support ring with the foam in between. The sealing member also has a top which is flexibly connected to the base. The top is fixed to the manhole cover with a gasket between it and the cover. A relief valve is provided to prevent the enclosed space within the manhole formed by the sealing member from overpressuring.

REFERENCES:
patent: 3712009 (1973-01-01), Campagna
patent: 3973856 (1976-08-01), Gaglioti
patent: 4067659 (1978-01-01), Campagna, Jr. et al.
patent: 4512492 (1985-04-01), Graybeal
patent: 5597263 (1997-01-01), Bravo

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