Manhole closure with a single liquid impervious, two-way gas pre

Details Manhole closure with a single liquid impervious, two-way gas pre Manhole closure with a single liquid impervious, two-way gas pre

1983-12-12

1985-04-23

Hall, George T.

Receptacles

Closures

With condition responsive vent or valve

404 25, B65D 5116

Patent

active

045124922

ABSTRACT:
A liquid impervious closure for a sewer system manhole opening having a single bi-directional pneumatic breather valve that allows for pneumatic pressure equalization on either side of said closure. The closure is comprised of a pan-shaped barrier and the breather valve mounted there through, said valve having a housing of threadably joined casings enclosing a single moveable sealing plug that engages a gasket to prevent liquid flow in one direction while permitting air flow in either direction.

REFERENCES:
patent: 2089251 (1937-08-01), DeFrees
patent: 4030851 (1977-06-01), Graybeal

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