US3872884A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Excess flow check valve
Assignee: Dixon Valve and Coupling Co LLC
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Filing: 1972-11-20
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Granted: 1975-03-25
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Expires: 1992-11-20
Abstract
Abstract An excess flow check valve for shutting off flow through a fluid line in the event the flow rate exceeds a predetermined amount, as in case the line breaks. The valve comprises a housing having large and small diameter bore portions and a valve element that has an imperforate portion that enters the small diameter bore with a close sliding fit to close the valve when the fluid pressure differential across the valve element exceeds a predetermined amount.
Inventors
- 👤 Wayne S Busdiecker
- 👤 Zdenek J Lansky
- 👤 John G Russell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:20
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/20; F16K17/22; F16K17/24; F16K17/28; F16K17/30; F16K2200/00; F16K2200/40; F16K2200/401; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785; Y10T137/7792
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
243 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve member slidable in said passage and having a perforate portion and a substantially imperforate portion, said perforate portion providing a passage through said member a pair of abutment faces on the body spaced from said large diameter bore and cooperable with a pair of spaced abutment faces on said valve member to limit movement of the valve member between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion are within said large bore to permit flow through said valve member and said body passage, one of said pairs of abutment faces being formed by end walls of a recess in one of said body and valve members, said end walls extending in only one radial direction from said small bore, the other pair of abutment faces extending radially into said recess a resilient member mounted exteriorly of the recess so as not to engage either of said end walls and biasing the valve member toward said open position, and said valve member being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said valve member.
Claim 2
Dependent Claim
243 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve member slidable in said passage and having a perforate portion and a substantially imperforate portion, said perforate portion providing a passage through said member a pair of abutment faces on the body spaced from said large diameter bore and cooperable with a pair of spaced abutment faces on said valve member to limit movement of the valve member between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion are within said large bore to permit flow through said valve member and said body passage, one of said pairs of abutment faces being formed by end walls of a recess in one of said body and valve members, said end walls extending in only one radial direction from said small bore, the other pair of abutment faces extending radially into said recess a resilient member mounted exteriorly of the recess so as not to engage either of said end walls and biasing the valve member toward said open position, and said valve member being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said valve member.
Claim 3
Dependent Claim
14 words
The valve of claim 1 in which said recess is in said valve member.
Claim 4
Dependent Claim
193 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve element slidable in said passage and having a perforate portion and an imperforate portion, said perforate portion providing a psssage through said element, abutment means spaced from the imperforate portion and said large diameter bore to limit movement of the element between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion is within said large bore to permit flow through said element and said body, a resilient member biasing the element toward said open position, said element being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said Element, said abutment means comprising abutments on the body that are engageable with shoulders on said perforate portion, said body abutments being provided by opposite sides of a snap ring carried in a recess in said body.
Claim 5
Dependent Claim
193 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve element slidable in said passage and having a perforate portion and an imperforate portion, said perforate portion providing a psssage through said element, abutment means spaced from the imperforate portion and said large diameter bore to limit movement of the element between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion is within said large bore to permit flow through said element and said body, a resilient member biasing the element toward said open position, said element being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said Element, said abutment means comprising abutments on the body that are engageable with shoulders on said perforate portion, said body abutments being provided by opposite sides of a snap ring carried in a recess in said body.
Claim 6
Dependent Claim
14 words
The valve of claim 1 in which said recess is in said body member.
Claim 7
Dependent Claim
201 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve element slidable in said passage and having a perforate portion and an imperforate portion, said perforate portion providing a passage through said element, means to limit movement of the element between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion is within said large bore to permit flow through said element and said body, a resilient member biasing the element toward said open position, and said element being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said element, said body having an annular recess surrounding said body passage, and means cooperable with end walls of said recess for limiting movement of said element in opening and closing directions said means including a groove in the outer periphery of the element and a snap ring projecting into said groove and into said recess.
Claim 8
Dependent Claim
201 words
An excess flow check valve comprising a body having a passage therethrough, said passage including a large diameter bore and a small diameter bore, a valve element slidable in said passage and having a perforate portion and an imperforate portion, said perforate portion providing a passage through said element, means to limit movement of the element between a closed position in which said imperforate portion is in said small bore to substantially prevent flow through both the small bore and the perforate portion and an open position in which said imperforate portion and at least part of the perforate portion is within said large bore to permit flow through said element and said body, a resilient member biasing the element toward said open position, and said element being movable to said closed position by a predetermined differential in fluid pressure acting on opposite ends of said element, said body having an annular recess surrounding said body passage, and means cooperable with end walls of said recess for limiting movement of said element in opening and closing directions said means including a groove in the outer periphery of the element and a snap ring projecting into said groove and into said recess.
Claim 9
Dependent Claim
65 words
The valve of claim 5, in which said groove has a diameter at one of its ends that is larger than its diameter at its other end, the larger diameter closely fitting the inside diameter of the snap ring when the latter is in said recess, and the smaller groove diameter permitting contraction of the ring substantially entirely into said other end of the groove.
Claim 10
Dependent Claim
39 words
The valve of claim 5, in which said recess is narrow to prevent appreciable axial travel of said snap ring, and said groove is relatively wide to accommodate full travel of the element between its open and closed positions.
Claim 11
Dependent Claim
21 words
The valve of claim 6, in which the groove is tapered from its large diameter end to its small diameter end.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-24 | 1978-09-23 | 1979-03-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-24 | 1982-09-23 | 1983-03-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-24 | 1986-09-23 | 1987-03-25 | $7700.00 | Window Closed / Lapsed |