Road structure – process – or apparatus – Pavement – Vault cover-closure
Patent
1976-11-03
1977-06-21
Byers, Nile C.
Road structure, process, or apparatus
Pavement
Vault cover-closure
52 21, 210163, E02D 2914
Patent
active
040308510
ABSTRACT:
A manhole closure for diverting liquid away from a sewer system that is readily installable in a conventional manhole opening beneath a manhole cover, the device including two-way pressure relief valves to compensate for increased or decreased system pressure (relative to atmospheric) within the manhole system while preventing excessive amounts of rainwater and the like, chemical spills or other undesirable pollutants from entering the sanitary sewer system. The two-way valve system includes upper and lower counterweighted flapper valves which sealably cover passages within the closure housing. A valve supporting plate is enclosed in a cylindrical housing and includes upper and lower strainers, the housing being readily mountable in a conventional manhole opening by a rigid supporting rim affixed to the housing. The device will divert liquid flow away from a sanitary sewerage system while preventing over or under gas pressure conditions from developing within the system.
REFERENCES:
patent: 606554 (1898-06-01), Jacobs
patent: 3712009 (1973-01-01), Campagna
patent: 3973856 (1976-08-01), Gaglioti
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