EP0418580A1 - Double clapet de non retour - Google Patents

Double clapet de non retour Download PDF

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Publication number
EP0418580A1
EP0418580A1 EP90116113A EP90116113A EP0418580A1 EP 0418580 A1 EP0418580 A1 EP 0418580A1 EP 90116113 A EP90116113 A EP 90116113A EP 90116113 A EP90116113 A EP 90116113A EP 0418580 A1 EP0418580 A1 EP 0418580A1
Authority
EP
European Patent Office
Prior art keywords
valve
valve element
check valve
seat
dual
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP90116113A
Other languages
German (de)
English (en)
Inventor
Rand H. Ackroyd
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Watts Water Technologies Inc
Original Assignee
Watts Regulator Co
Watts Investment Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Watts Regulator Co, Watts Investment Co filed Critical Watts Regulator Co
Publication of EP0418580A1 publication Critical patent/EP0418580A1/fr
Withdrawn legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03C—DOMESTIC PLUMBING INSTALLATIONS FOR FRESH WATER OR WASTE WATER; SINKS
    • E03C1/00—Domestic plumbing installations for fresh water or waste water; Sinks
    • E03C1/02—Plumbing installations for fresh water
    • E03C1/10—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves
    • E03C1/106—Devices for preventing contamination of drinking-water pipes, e.g. means for aerating self-closing flushing valves using two or more check valves

Definitions

  • the invention relates to backflow preventors of the dual check valve type.
  • the dual check valve type backflow prevention may be employed.
  • One such dual check valve (Series 7, sold by Watts Regulator Company of North Andover, Massachusetts) has two separate check valve modules disposed in sequence within a body for independent operation.
  • a dual check valve (sold by The Ford Meter Box Company, Inc. of Wabash, Indiana) has two interacting valve elements, i.e., the second valve element is urged into sealing engagement by a spring bearing on the first valve element, thus, the valve elements are not separate.
  • Ames Company, Inc., of Woodland, California sells a dual check valve consisting of two, separate check valves placed in sequence in inlet piping for this purpose.
  • a dual check valve backflow preventer comprises a valve body defining a volume and an inlet and an outlet for flow of liquid through the volume of the valve body, and, disposed within the valve body, a first valve seat and a second valve seat, a first check valve assembly comprising a first valve element, a first seal mounted upon the first valve element and means for urging the first seal mounted on the first valve element into sealing engagement with the first valve seat, and a second check valve assembly, separate from the first check valve assembly, comprises a second valve element, a second seal mounted upon the second valve element, and means for urging the second seal into sealing engagement with the second valve seat, the first valve element is mounted for movement within the valve body along a valve axis, between a closed position and an open position for flow of fluid from the inlet toward the outlet, and the second valve element is mounted for movement independent of the first valve element along the valve axis between a closed position and an open position for flow of fluid from the inlet toward the outlet,and the first valve element, at least in closed
  • the valve body further defines an access opening sized for removal and replacement of components in the back flow preventer within the volume, and the valve body further comprises a cap for sealed closure of the access opening.
  • the first valve element has the form of a cup, and the second valve element, at least in its open position, extends within the cup.
  • the dual check valve backflow preventer further comprises a removable valve seat body means defining the first and second seats, preferably the valve seat body means comprises a first valve seat body element defining the first valve seat and a discrete second valve seat body element defining the second seat.
  • the second check valve assembly further comprises a mounting member, and the means for urging the second valve element into sealing engagement comprises a spring disposed between the mounting member and the second valve element, preferably the second valve element further comprises an elongated element extending through the mounting member.
  • the mounting member further defines the second valve seat.
  • the means for urging the first valve element into sealing engagement comprises a spring disposed between the first valve element and the valve body.
  • a dual check valve 10 of the invention includes a valve body 12 defining a flow inlet 14 and a flow outlet 16.
  • the valve body at the flow outlet is threaded 18 for joining to a piping connector of, e.g., a domestic water supply system.
  • the body at the flow inlet defines an axial groove 20 for receiving a swivel meter nut 21 for attachment of the valve to a domestic water meter.
  • the body 10 is also threaded at 22 for receiving in threaded engagement, access cap 24, with O-ring 26 disposed therebetween in groove 27 for maintaining a leak-tight seal.
  • first check valve element 30 and second check valve element 32 Disposed within the volume 28 defined by valve body 12 are first check valve element 30 and second check valve element 32.
  • the check valve elements are separate and mounted for independent operation.
  • a valve seat body 34 disposed with the volume of the body is a valve seat body 34, shown also in Figs. 1A and 1B, held in place by cage 36 disposed to extend between rim 38 of access cap 24 and valve seat body surface 40.
  • cage 36 defines one or more orifices 37 for flow of water therethrough.
  • the valve seat body defines a groove 42 within which there is disposed O-ring 43 for water-right seal about the seat body.
  • First check valve element 30 includes a cup-shaped body 44 defining a groove 45 within which there is disposed a first sealing ring 46, positioned to engage sealingly upon seat surface 48 of valve seat body 34.
  • Valve element 30 is disposed in sliding engagement within cylindrical orifice 52 defined by cage 36 and aligned cylindrical orifice 54 of cap 24.
  • Spring 55 disposed between cap 24 and valve element 30, urges the sealing ring 46 into sealing engagement with seat surface 48.
  • Spring 55 has an inner diameter D s , predetermined for interference fit about shoulder 56 of cap 24 at one end and annular orifice 58 defined by the valve element 30 at the other end. In this manner, cap 24, spring 54 and valve element 30 are joined integrally, with the valve element free to move axially (along axis A) relative to the cap, in response to water inlet pressure (P I ).
  • Second check valve element mounting member 62 is disposed within the volume 28 of the valve body 12, disposed about inlet 14 and held in place by valve seat body 34, is second check valve element mounting member 62, an integral element of valve seat body 34. Member 62 defines one or more orifices 64 for flow of water therethrough. Second valve element 32 includes an elogated element 66, in threaded engagement with valve body 33, that extends through corresponding orifice 68 in member 62 and terminates in threaded engagement with retaining nut 69.
  • Check valve element 32 defines an annular groove 70, within which there is disposed a second sealing ring 72, sized and constructed for sealing engagement upon sealing surface 49 of valve seat body 34.
  • the second check valve element further includes a spring 74 engaged between the mounting member 62 and the undersurface 76 of nut 69, the spring 74 urging the second valve element into sealing contact with the valve seat surface.
  • Nut 69 and spring 74 further act to limit axial travel of second valve element 32 in response to inlet pressure P I to a distance that is less than the depth of the cup portion of first valve element 30 (between the surface of member 62 and the inner base surface 82 of cup portion 44), thereby to maintain independent operation of the separate check valve elements, even when the second valve element 32 has failed and is fully open (right-most position) and the first valve element 30 is in sealing engagement (left-most position).
  • the dual check valve 10 of the invention is installed in a domestic water supply line with the valve inlet 14 connected to a water meter (not shown) and the outlet connected to a domestic system (also not shown).
  • first and second check valve element 30, 32 are urged independently by springs 55, 74, respectively, to cause first and second sealing rings 46, 72, respectively, into sealing engagement with respective valve seat surfaces 48, 49.
  • inlet pressure P I Upon application of inlet pressure P I , the check valve elements are urged out of sealing engagement. If inlet flow ceases (or if a backflow pressure P B from outlet 16 exceeds the level of inflow pressure P I ), springs 55, 74 urge both check valve elements back into sealing engagement, thereby to prevent potentially contaminating flow from the domestic system back into the utility system. Due to the nature of the separate dual check valves of the invention, should either check valve fail, the other operates independently to check backflow.
  • cap 24 In order to inspect or repair or replace the components of valve 10, cap 24 is unthreaded and removed from body 12, drawing spring 55 and first check valve element 30 from within the valve body, and allowing removal of cage 36. Valve seat body 34 and the second check valve element 32 with spring 74 may thereafter be removed as a unit. Any or all of these components, and/or O-rings or seals, may be repaired or replaced with the valve body still in place in the piping, and the dual check valve 10 reassembled for operation.
  • valve seat body 34′ may be formed as two discrete elements, including a first valve body element 133 defining first valve seat surface 48′ for first check valve element 30, and a second valve body element 134 defining second valve seat surface 49′ for second check valve 32 and mounting member 62′.

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Check Valves (AREA)
  • Domestic Plumbing Installations (AREA)
EP90116113A 1989-09-19 1990-08-22 Double clapet de non retour Withdrawn EP0418580A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US40957089A 1989-09-19 1989-09-19
US409570 1989-09-19

Publications (1)

Publication Number Publication Date
EP0418580A1 true EP0418580A1 (fr) 1991-03-27

Family

ID=23621078

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90116113A Withdrawn EP0418580A1 (fr) 1989-09-19 1990-08-22 Double clapet de non retour

Country Status (3)

Country Link
EP (1) EP0418580A1 (fr)
JP (1) JPH03129186A (fr)
AU (1) AU6130790A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754275A (en) * 1994-06-14 1998-05-19 Noritsu Koki Co., Ltd. Optical apparatus having lens-system drive device for temperature correction in direction of optical axis
US20220098014A1 (en) * 2020-09-27 2022-03-31 Fuyang Tongli Industrial Co., Ltd. Jack with Double High-pressure Structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5537108B2 (ja) * 2009-09-28 2014-07-02 株式会社テイエルブイ 逆止弁及びそれを用いた蒸気供給システム

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172469A (en) * 1978-02-06 1979-10-30 Mcdonnell Douglas Corporation Soft seat check valve
US4284097A (en) * 1978-03-28 1981-08-18 Amtrol Inc. In line back flow preventer
AT366803B (de) * 1979-06-15 1982-05-10 C H Zikesch Ges Mit Beschraenk Absperr- und regelventil

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4172469A (en) * 1978-02-06 1979-10-30 Mcdonnell Douglas Corporation Soft seat check valve
US4284097A (en) * 1978-03-28 1981-08-18 Amtrol Inc. In line back flow preventer
AT366803B (de) * 1979-06-15 1982-05-10 C H Zikesch Ges Mit Beschraenk Absperr- und regelventil

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754275A (en) * 1994-06-14 1998-05-19 Noritsu Koki Co., Ltd. Optical apparatus having lens-system drive device for temperature correction in direction of optical axis
US20220098014A1 (en) * 2020-09-27 2022-03-31 Fuyang Tongli Industrial Co., Ltd. Jack with Double High-pressure Structure
US11814272B2 (en) * 2020-09-27 2023-11-14 Fuyang Tongli Industrial Co., Ltd. Jack with double high-pressure structure

Also Published As

Publication number Publication date
AU6130790A (en) 1991-04-11
JPH03129186A (ja) 1991-06-03

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Legal Events

Date Code Title Description
PUAI Public reference made under article 153(3) epc to a published international application that has entered the european phase

Free format text: ORIGINAL CODE: 0009012

17P Request for examination filed

Effective date: 19900822

AK Designated contracting states

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IT LI LU NL SE

17Q First examination report despatched

Effective date: 19911113

RAP1 Party data changed (applicant data changed or rights of an application transferred)

Owner name: WATTS INVESTMENT COMPANY

STAA Information on the status of an ep patent application or granted ep patent

Free format text: STATUS: THE APPLICATION IS DEEMED TO BE WITHDRAWN

18D Application deemed to be withdrawn

Effective date: 19930119