Source: http://www.google.com/patents/US6367505?dq=6,202,00
Timestamp: 2014-08-21 20:16:40
Document Index: 195783041

Matched Legal Cases: ['art. 2', 'art. 10', 'art 16', 'art 20', 'art 20', 'art 20', 'art 16', 'art 20', 'art 16']

Patent US6367505 - Check valve with oversized bill - Google PatentsSearch Images Maps Play YouTube News Gmail Drive More »Sign in<nobr>Advanced Patent Search</nobr>PatentsA check valve having an upstream inlet part mountable on a discharge end of a conduit, a downstream outlet part adapted to prevent backflow of fluid through the check valve, and a transition part located between the upstream inlet part and the downstream outlet part. A longitudinal dimension of the downstream...http://www.google.com/patents/US6367505?utm_source=gb-gplus-sharePatent US6367505 - Check valve with oversized billAdvanced Patent SearchPublication numberUS6367505 B1Publication typeGrantApplication numberUS 09/533,298Publication dateApr 9, 2002Filing dateMar 22, 2000Priority dateMar 22, 2000Fee statusPaidAlso published asCA2366605A1, CA2366605C, CN1288370C, CN1432751A, EP1326039A1, EP1326039B1Publication number09533298, 533298, US 6367505 B1, US 6367505B1, US-B1-6367505, US6367505 B1, US6367505B1InventorsSpiros G. Raftis, Andre T. Abromaitis, Michael J. DuerOriginal AssigneeRed Valve Co., Inc.Export CitationBiBTeX, EndNote, RefManPatent Citations (5), Referenced by (7), Classifications (6), Legal Events (5) External Links: USPTO, USPTO Assignment, EspacenetCheck valve with oversized billUS 6367505 B1Abstract A check valve having an upstream inlet part mountable on a discharge end of a conduit, a downstream outlet part adapted to prevent backflow of fluid through the check valve, and a transition part located between the upstream inlet part and the downstream outlet part. A longitudinal dimension of the downstream outlet part extending in a direction transverse to a direction of flow is at least approximately 1.57 times the diameter of the upstream inlet part.
We claim: 1. A check valve, comprising:
an upstream inlet part mountable on a discharge end of a conduit; a downstream outlet part adapted to prevent backflow of fluid through the check valve; a transition part located between the upstream inlet part and the downstream outlet part; a longitudinal dimension of the downstream outlet pat extending in a direction transverse to a direction of flow being greater than approximately 1.57 times the diameter of the upstream inlet part; and wherein the downstream outlet part is symmetrical about a horizontal longitudinal plane though the downstream outlet part, the longitudinal plane coincident with the center line of the upstream inlet part. 2. The check valve of claim 1, further comprising a flange on the upstream inlet part.
an upstream inlet part mountable on a discharge end of a conduit; a downstream outlet part adapted to prevent backflow of fluid through the check valve; a transition part located between the upstream inlet part and the downstream outlet part; a longitudinal dimension of the downstream outlet part extending in a direction transverse to a direction of flow being greater than approximately 1.57 times the diameter of the upstream inlet part; and wherein the downstream outlet part is symmetrical about a vertical longitudinal plane through the downstream outlet part, the longitudinal plane coincident with the center line of the upstream inlet part. 10. The check valve of claim 9, further comprising a flange on the upstream inlet part.
an upstream inlet part mountable on a discharge end of a conduit; a downstream outlet part adapted to prevent backflow of fluid through the check valve; a transition part located between the upstream inlet part and the downstream outlet part; a longitudinal dimension of the downstream outlet part extending in a direction transverse to a direction of flow being greater than approximately 1.57 times the diameter of the upstream inlet part; and wherein the downstream outlet part is performed to define a clear bill. 18. The check valve of claim 17, further comprising a flange on the upstream inlet part.
providing a check valve comprising an upstream inlet part mountable on a discharge end of the conduit, a downstream outlet part adapted to prevent backflow of a fluid through the check valve, a transition part located between the upstream inlet part and the downstream outlet part, and a longitudinal dimension of the downstream outlet part extending in a direction transverse to a direction of flow being greater than approximately 1.57 times the diameter of the upstream inlet part; and directing fluid through the conduit, in the inlet part, through the transition part, and out the downstream outlet part. Description
The present invention relates to a check valve of the so-called �duckbill� type for use in drainage systems and effluent outfall lines.
Conventional rubber duckbill check valves have an inlet cuff, an outlet bill and a transitional middle part for connecting the cuff and the bill. The bill comprises a slit which opens when fluid is forced through the valve. Typically, existing �duckbill� type check valves have a bill slit dimension that is equal to or less than one-half the cuff (inlet) circumference. The reason for this is that if the bill slit dimension is larger than one-half the circumference of the cuff diameter, it becomes difficult or even impossible to remove a one-piece mandrel, which is used to manufacture the check valve through the cuff.
SUMMARY OF THE INVENTION The present invention is a check valve with an oversized bill. The present invention includes a tubular inlet part, an outlet part and a transitional middle part, connecting the inlet part with the outlet part, wherein the width or height of the outlet part is at least approximately 1.57 times the diameter of the inlet part. The outlet part may be symmetrical about a longitudinal plane through the check valve. It can also have a curved bill.
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1a shows a top view of a conventional duckbill check valve according to the prior art;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT FIGS. 1 and 2 both show conventional duckbill check valves. These valves comprise an inlet portion 10, a transitional portion 12 and an outlet portion 14. The advantages of these designs are the low tooling costs and simple removal of a mandrel from the completed part. The check valve shown in FIG. 2 is slightly widening, with the width of the outlet portion 14 approximately equal to one-half the circumference of the inlet portion 10. The mandrel is slightly more difficult to remove from the completed valve, but the headloss is lower.
After extensive testing at the Water Research Laboratories of Utah State University, it was determined that for submerged discharge, the headloss of a �duckbill� type of check valve is very closely equal to:
H=Q2/19.5gA2 where H=Headloss in feet of water,
The duckbill check valve 22 is preferably made from an elastomer, such as neoprene, or an elastomer reinforced with synthetic fabric, such as nylon or polyester, with construction similar to an automobile tire. The inlet part 16 is generally made of a stiff, durable material, such as styrene butadiene, with polyester fabric reinforcing, whereas the outlet part 20 is made of a flexible material to allow proper opening and closing of the outlet part 20. Further, the outlet part 20 may be symmetrical about a longitudinal plane A�A through the duckbill check valve 22. This longitudinal plane A�A is coincident with a center line of the inlet part 16. In addition, it is also envisioned that the outlet part 20 may be curvilinear, as described in U.S. Pat. No. 5,727,593. The inlet part 16 may be fitted with a flange 32, instead of the cuff shown in the drawings.
Patent CitationsCited PatentFiling datePublication dateApplicantTitleUS4585031 *Jul 12, 1985Apr 29, 1986Red Valve Co., Inc.For sewage conduitsUS4607663 *Jul 12, 1985Aug 26, 1986Red Valve Co., Inc.For sewage conduitsUS5606995 *Oct 26, 1994Mar 4, 1997Red Valve Company, Inc.Inversion-resistant, readily openable tide gate valveUS5727593Jun 26, 1996Mar 17, 1998Red Valve Company, Inc.Tide gate valve with curvilinear billUS5931197Apr 16, 1998Aug 3, 1999Red Valve Co., Inc.Asymmetrical check valve* Cited by examinerReferenced byCiting PatentFiling datePublication dateApplicantTitleUS6719004Jul 25, 2002Apr 13, 2004Donald G. HuberCheck valve floor drainUS6953059Jul 25, 2003Oct 11, 2005Red Valve Company, Inc.Check valve with hangerUS8322378Oct 4, 2010Dec 4, 2012Elasto-Valve Rubber Products, Inc.I-beam check valveEP1559938A1Jan 27, 2004Aug 3, 2005Red Valve Company, Inc.Check valve with hangerWO2006105574A1 *Oct 11, 2005Oct 12, 2006Sophinity Pty LtdDispensing fluids from containers using self closing valve, typically duckbill type valveWO2009098722A1 *Feb 6, 2008Aug 13, 2009Idee & Prodotti S R LMaximum pressure hydraulic valveWO2013096967A1 *Dec 26, 2012Jun 27, 2013Flsmidth A/SVariable flow self-diluting feedwell system* Cited by examinerClassifications U.S. Classification137/846, 137/847, 137/850International ClassificationF16K15/14Cooperative ClassificationF16K15/147European ClassificationF16K15/14H3Legal EventsDateCodeEventDescriptionSep 11, 2013FPAYFee paymentYear of fee payment: 12Sep 9, 2009FPAYFee paymentYear of fee payment: 8Sep 16, 2005FPAYFee paymentYear of fee payment: 4Jun 3, 2003CCCertificate of correctionAug 7, 2000ASAssignmentOwner name: RED VALVE CO., INC., PENNSYLVANIAFree format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:RAFTIS, SPIROS G.;ABROMAITIS, ANDRE T.;DUER, MICHAEL J.;REEL/FRAME:011046/0022Effective date: 20000626Owner name: RED VALVE CO., INC. P.O. BOX 548 700 N. BELL AVENURotateOriginal ImageGoogle Home - Sitemap - USPTO Bulk Downloads - Privacy Policy - Terms of Service - About Google Patents - Send FeedbackData provided by IFI CLAIMS Patent Services©2012 Google