Air fitting with an integral check valve

Fluid handling – Line condition change responsive valves – Direct response valves

Reexamination Certificate

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Details

C137S533190, C137S538000, C251S337000

Reexamination Certificate

active

10953302

ABSTRACT:
An air fitting with an integral check valve includes a housing having an inlet and at least one outlet, a passage extending between the inlet and the at least one outlet with a valve seat being formed in the passage adjacent the at least one outlet with a portion between the outlet and the valve having a plurality of channels separated by lands which form a guide surface for the valve as it is being forced onto the valve seat by a spring. The channels allow passage of air around the valve member with less restriction when the valve member is lifted off the valve seat.

REFERENCES:
patent: 2710023 (1955-06-01), Blackford et al.
patent: 3324673 (1967-06-01), Lindahl et al.
patent: 3901475 (1975-08-01), Dreibelbis
patent: 3913615 (1975-10-01), Cooper
patent: 4091839 (1978-05-01), Donner
patent: 4171712 (1979-10-01), DeForrest
patent: 4204560 (1980-05-01), Eriksen
patent: 4700741 (1987-10-01), Murphy
patent: 4736768 (1988-04-01), Tsubouchi et al.
patent: 4776430 (1988-10-01), Rule
patent: 5566869 (1996-10-01), Katz
patent: 5622392 (1997-04-01), Gochenouer
patent: 6227240 (2001-05-01), Wu et al.
patent: 6631929 (2003-10-01), Pickering

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