US4993452A — Low pressure check valve

Claim 1

Independent Claim 162 words

In an exhaust gas aftertreatment system having an air supply system comprising an air feeding means for selectively creating a flow of air; a flow passage for directing the flow of air including at least two coaxial tubular members; a valve element having a circular base portion surrounding and supported by one of said coaxial tubular members, a flexing portion extending from said circular base portion and converging to form a tip, and a diametrical slit formed in said tip; a sealing means surrounding said flow passage for sealing a joint formed between said coaxial tubular members; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion; wherein said valve element permits the flow of air from said air feeding means in one direction and prevents the flow of exhaust gas in an opposite direction and said support means prevents said valve element from collapsing when said air feeding means is inoperable.

Claim 2

Dependent Claim 162 words

In an exhaust gas aftertreatment system having an air supply system comprising an air feeding means for selectively creating a flow of air; a flow passage for directing the flow of air including at least two coaxial tubular members; a valve element having a circular base portion surrounding and supported by one of said coaxial tubular members, a flexing portion extending from said circular base portion and converging to form a tip, and a diametrical slit formed in said tip; a sealing means surrounding said flow passage for sealing a joint formed between said coaxial tubular members; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion; wherein said valve element permits the flow of air from said air feeding means in one direction and prevents the flow of exhaust gas in an opposite direction and said support means prevents said valve element from collapsing when said air feeding means is inoperable.

Claim 3

Dependent Claim 46 words

The system as defined in claim 1, wherein said coaxial tubular members are rigid and said base portion of said valve element extends along an inner surface of a first of said tubular members and along an outer surface of a second of said tubular members.

Claim 4

Dependent Claim 38 words

The system as defined in claim 2, wherein said sealing means is a resilient cylindrical tube and is positioned in contact with an outer surface of said first tubular member and said base portion of said valve member.

Claim 5

Dependent Claim 21 words

The system as defined in claim 3, wherein said sealing means is secured in place by a pair of circular clamps.

Claim 6

Dependent Claim 57 words

The system as defined in claim 1, wherein said coaxial tubular members are rigid and said base portion of said valve element extends along an inner surface of a first of said tubular members and an outer surface of said first of said tubular members and abuts against an end of a second of said tubular members.

Claim 7

Dependent Claim 38 words

The system as defined in claim 5, wherein said sealing means is a resilient cylindrical tube and is positioned in contact with said base portion of said valve member and an outer surface of said second tubular member.

Claim 8

Dependent Claim 21 words

The system as defined in claim 6, wherein said sealing means is secured in place by a pair of circular clamps.

Claim 9

Dependent Claim 32 words

The system as defined in claim 1, wherein said support means is an angular wire extending from one of said tubular members into said valve element diametrically across said circular base portion.

Claim 10

Dependent Claim 31 words

The system as defined in claim 8, wherein said angular wire includes a biasing ring for forcibly contacting said one of said tubular members and maintaining said angular wire in place.

Claim 11

Dependent Claim 20 words

The system as defined in claim 9, wherein said angular wire extends perpendicular to a plane including said diametrical slit.

Claim 12

Dependent Claim 134 words

A check valve comprising; a rigid cylindrical housing having first and second coaxial tubular members, a valve element having a circular base portion surrounding and supported by one of said coaxial tubular members, a flexing portion extending from said circular base portion and converging to form a diametrical tip and a slit formed in said tip; a sealing means surrounding said housing for sealing a joint formed between said coaxial tubular members; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion; wherein said check valve permits the flow of fluid in one direction and resists the flow of fluid in an opposite direction and said support means prevents said valve element from collapsing when said flow of fluid is in said opposite direction.

Claim 13

Dependent Claim 134 words

A check valve comprising; a rigid cylindrical housing having first and second coaxial tubular members, a valve element having a circular base portion surrounding and supported by one of said coaxial tubular members, a flexing portion extending from said circular base portion and converging to form a diametrical tip and a slit formed in said tip; a sealing means surrounding said housing for sealing a joint formed between said coaxial tubular members; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion; wherein said check valve permits the flow of fluid in one direction and resists the flow of fluid in an opposite direction and said support means prevents said valve element from collapsing when said flow of fluid is in said opposite direction.

Claim 14

Dependent Claim 45 words

The valve as defined in claim 11, wherein said coaxial tubular members are rigid and said base portion of said valve element extends along an inner surface of a first of said tubular members and an outer surface of a second of said tubular members.

Claim 15

Dependent Claim 38 words

The valve as defined in claim 12, wherein said sealing means is a resilient cylindrical tube and is positioned in contact with an outer surface of said first tubular member and said base portion of said valve member.

Claim 16

Dependent Claim 21 words

The valve as defined in claim 13, wherein said sealing means is secured in place by a pair of circular clamps.

Claim 17

Dependent Claim 57 words

The valve as defined in claim 11, wherein said coaxial tubular members are rigid and said base portion of said valve element extends along an inner surface of a first of said tubular members and an outer surface of said first of said tubular members and abuts against an end of a second of said tubular members.

Claim 18

Dependent Claim 38 words

The valve as defined in claim 15, wherein said sealing means is a resilient cylindrical tube and is positioned in contact with said base portion of said valve member and an outer surface of said second tubular member.

Claim 19

Dependent Claim 32 words

The valve as defined in claim 11, wherein said support means is an angular wire extending from one of said tubular members into said valve element diametrically across said circular base portion.

Claim 20

Dependent Claim 31 words

The valve as defined in claim 17, wherein said angular wire includes a biasing ring for forcibly contacting said one of said tubular members and maintaining said angular wire in place.

Claim 21

Dependent Claim 20 words

The valve as defined in claim 18, wherein said angular wire extends perpendicular to a plane including said diametrical slit.

Claim 22

Dependent Claim 83 words

A valve element for a check valve comprising: a circular base portion; a flexing portion extending from said circular base portion and converging to form a diametrical tip; a diametrical slit formed in said tip for permitting the flow of fluid in a first direction; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion, said support means being an angular wire extending into said valve element diametrically across said circular base portion.

Claim 23

Dependent Claim 83 words

A valve element for a check valve comprising: a circular base portion; a flexing portion extending from said circular base portion and converging to form a diametrical tip; a diametrical slit formed in said tip for permitting the flow of fluid in a first direction; and a support means extending into said valve element to a position adjacent said tip for supporting said flexing portion, said support means being an angular wire extending into said valve element diametrically across said circular base portion.

Claim 24

Dependent Claim 21 words

The valve element as defined in claim 20, wherein said angular wire extends perpendicular to a plane including said diametrical slit.

Claim 25

Dependent Claim 23 words

The valve element as defined in claim 20, further comprising a pair of diametrically opposed elongated stiffening ribs formed in said flexing portion.

Claim 26

Dependent Claim 37 words

The valve element as defined in claim 22, wherein said diametrically opposed elongated stiffening ribs extend axially along said flexing portion, and a plane including said stiffening ribs extends perpendicular to a plane including said diametrical slit.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1994-02-18	1994-08-20	1995-02-19	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1998-02-18	1998-08-20	1999-02-19	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2002-02-18	2002-08-20	2003-02-19	$7700.00	Window Closed / Lapsed

Low pressure check valve

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