Internal pressure equilibrium device for airtight space

Details Internal pressure equilibrium device for airtight space Internal pressure equilibrium device for airtight space

2007-04-17

2007-04-17

Hepperle, Stephen M. (Department: 3753)

Fluid handling

Line condition change responsive valves

Bi-directional flow valves

C137S533190

Reexamination Certificate

active

11053866

ABSTRACT:
The invention relates to an internal pressure equilibrium adjustment device for airtight space with rapid operation and simple structure.The invention comprises of a pipe8which is mounted on the wall9of airtight space and has a plurality of holes81at the periphery, a case7which surrounds the external periphery of the pipe8and has a plurality of holes71on the wall, a first port3which is formed at one end of the case7, a first ring4which is provided above the first port3, a second port5which is formed at the partition wall12of the case7, and a second ring6which is provided above the second port5.

REFERENCES:
patent: 2879786 (1959-03-01), La Delle Heideman
patent: 5273068 (1993-12-01), Duren
patent: 5623958 (1997-04-01), Bumpers

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