WO2007064270A1 - Nonreturn valve - Google Patents

Nonreturn valve Download PDF

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Publication number
WO2007064270A1
WO2007064270A1 PCT/SE2006/001310 SE2006001310W WO2007064270A1 WO 2007064270 A1 WO2007064270 A1 WO 2007064270A1 SE 2006001310 W SE2006001310 W SE 2006001310W WO 2007064270 A1 WO2007064270 A1 WO 2007064270A1
Authority
WO
WIPO (PCT)
Prior art keywords
flow
flap
nonreturn valve
forwards
return flow
Prior art date
Application number
PCT/SE2006/001310
Other languages
French (fr)
Inventor
Matts Persson
Original Assignee
Matts Persson
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 Matts Persson filed Critical Matts Persson
Publication of WO2007064270A1 publication Critical patent/WO2007064270A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
    • F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
    • F16K17/12—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side weight-loaded
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/06—Devices for restraining rats or other animals
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F7/00—Other installations or implements for operating sewer systems, e.g. for preventing or indicating stoppage; Emptying cesspools
    • E03F7/02—Shut-off devices
    • E03F7/04—Valves for preventing return flow
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
    • F16K1/16—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members
    • F16K1/18—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps
    • F16K1/22—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces with pivoted closure-members with pivoted discs or flaps with axis of rotation crossing the valve member, e.g. butterfly valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K15/00—Check valves
    • F16K15/02—Check valves with guided rigid valve members
    • F16K15/03—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member
    • F16K15/033—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member spring-loaded
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
    • F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
    • F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
    • F16K3/04—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members
    • F16K3/06—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor with pivoted closure members in the form of closure plates arranged between supply and discharge passages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
    • F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
    • F24F11/75—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity for maintaining constant air flow rate or air velocity
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
    • F24F13/08—Air-flow control members, e.g. louvres, grilles, flaps or guide plates
    • F24F13/10—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers
    • F24F13/14—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre
    • F24F13/1426—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means
    • F24F2013/146—Air-flow control members, e.g. louvres, grilles, flaps or guide plates movable, e.g. dampers built up of tilting members, e.g. louvre characterised by actuating means with springs

Definitions

  • the present invention relates to a nonreturn valve intended to be used inside a tube structure, the area of flow of said nonreturn valve can vary by aid of a movably provided flap located in the tube structure, which minimizes or prevents a return flow of fluid, which is fed as a flow forwards in said tube structure.
  • the flap which is stiff, has a first limiting surface with at least one portion bent outwards to receive pressure forces from said return flow.
  • the flap is covering the whole area of flow. In this case the opposite limiting area of the flap is turned towards the flow forwards. But when the flow forwards is stronger that the return flow, said flap is pressed to the side by the flow forwards, so that the nonreturn valve is opened.
  • Nonreturn valves which minimize or prevent a return flow of fluid in a tube structure, which is fed forwards in the tube structure, which consists of a e.g. a tube intended to be used in a discharge pipe, a pipe in process industry, oil industry, chemical industry and so on.
  • the problems raised with these are that they do not resist high pressure over 0,5 bar, they do not tighten against said return flow quickly enough and effective or that their structure, when the nonreturn valve is open, take too large space, so that the area of flow will be smaller and slows down the speed and the volume of the flow forwards.
  • Nonreturn valves having a movable ball which moves from one space to at the side of the tube structure into area of flow for the opening and the closing, requires expensive structures and is minimize the flow forwards, when they are open.
  • Nonreturn valves having resilient rubber flaps do not resist high pressure and have difficulties to totally tight at the closing.
  • the document WO 98/10149 refers to a device to stop rats to climb upwards in a vertically running drainage pipe. This nonreturn valve is provided with two tooth formed flaps bent outwards, which are directed downwards and which are closed towards each other by aid of their own weight, when they are hinging downwards and are provided with an opening upwards for drainage of water in a direction downwards.
  • this structure should be used as a nonreturn valve in horizontally running pipes where the fluid flows in the bottom of the pipe during return flow and flow forwards, a closing can not be achieved until during stronger return flows, whereby the closing is slow and is not tightening until during higher pressure of the return flow.
  • Two flaps also require large space from said area of flow in an open position. During closing a big risk occurs that the tightening surfaces of the flap will be displaced in a direction towards each other. The function will in this way become unsafe and the valve can easy be broken owing to an uneven load.
  • the object of the present invention is to solve the problem stated above by that the flap, which mainly is stiff, comprises a first limiting surface, which has a bulging portion, which can absorb high pressure loads from a return flow of fluid, when it is turned towards said return flow, so that only one flap is needed to cover an area of flow and so that said flap easier and faster is going to be opened, when a flow forwards of said fluid is stronger than said return flow.
  • the nonreturn valve according to the invention has a area of flow, which can vary by aid of a movable flap provided in the tube structure, which minimizes or prevents a return flow of fluid, which is fed forwards in the tube structure consisting of e.g. a tube, a discharge pipe, a tube in process industry, the oil industry or the chemical industry.
  • the flap which is stiff, comprises a first limiting surface having at lest one portion bent outwards in order to better be able to absorb loads from the return flow than what a flat surface can do.
  • the bulged surface is curved towards the return flow, when the return flow is stronger than the flow forwards or when the nonreturn valve is closed. Only one flap is needed in this case in order to cover the whole area of flow.
  • the opposite limiting surface of the flap is now turned towards the flow forwards. But when the flow forwards is stronger than the return flow, the flap is pressed aside of said flow forwards, so that an enlargement of the area of flow is achieved, so that the nonreturn valve is opened.
  • the flap is stiff and sheet formed and made like a curved plate.
  • the first limiting area comprises the bulged portion having a convex formation towards the return flow and the other, opposite limiting area comprises a concave formation towards the flow forwards.
  • the convex formation is made as a first curved surface in order to be able to resist large pressure and is formed as a part of a mantle surface of a cylinder formation.
  • the flap has an edge area, which functions as a tightening contact portion for contacting and tightening against an inner wall located in the tube structure, which connects to the same, when the nonreturn valve is closed.
  • the inner wall has a second spherical surface, whereby the edge area has an extension like a curved line, which during the contact continuously follows the extension of the second curved surface in order to achieve a maximum tightening during the closing along the whole edge area.
  • a part of the edge area is movable anchored via a means of attachments e.g.
  • the inner walls have a tightening fold of a rubber like material for tightening against the edge area and against the attachment means.
  • the attachment means can be fixed in the same.
  • the first limiting surface is arranged in an angle which is smaller than 60° and preferable about 45° in relation to the direction of the return flow, When the flap is closed for achieving the best function, so that the first limiting area towards the return flow will become larger and must resist a larger load the smaller said angle is, at the same time as the pressure from the edge area towards the inner wall increases in order to achieve a better tightening and a faster opening and closing towards the flap.
  • the edge area can have a tightening seal preferably made of a resilient material such as rubber or plastic.
  • a tightening seal preferably made of a resilient material such as rubber or plastic.
  • the flap When the tube structure extends in a direction upwards the flap needs help, when no return flow or flow forwards exist, to spring back to the closed position in order to be quickly into a position to meet a return flow.
  • the flap In order to manage this the flap is resiliently arranged towards the inner wall by aid of a spring back portion e.g. a helical spring, rubber body, so that it always is closed when flow forwards does not exist and tensioned when flow forwards exist.
  • the flap be made of metal, plastic, rubber or combinations of these materials with or without reinforcement of one or more reinforcing of e.g. carbon fibre, glass fibre, glass fibre reinforcing materials in or between the different materials.
  • the manufacturing of said flap can be performed by e.g.
  • Fig. 1 shows a translucent perspective view of a nonreturn valve according to the invention
  • Fig. 2 shows a longitudinal section through a nonreturn valve viewed from one side, in a closed (unbroken line of the flap) and an open position (broken line of the flap),
  • Fig. 3 shows a longitudinal section through a nonreturn valve viewed from below, in a closed (unbroken line of the flap) and an open position (broken line of the flap),
  • Fig. 4 shows a section through a nonreturn valve in an open position, with a maximum area of flow
  • Fig. 5 shows a longitudinal section through a horizontally extending nonreturn valve viewed from one side, in a closed position, whereby said flap comprises a tightening gasket and the inner wall comprises a tightening fold.
  • a nonreturn valve 1 is illustrated consisting of a tube structure 3 having a flap 4, which is able to increase and decrease its area of flow 2 of a return flow 5 of fluid 6, which is fed forwards in a flow forwards 7.
  • the flap 4 comprises a first limiting area 8 having a bulging portion 10 turned towards the return flow 5, such as a convex formation 1 1 and a second limiting area 9 located opposite the first one, which is turned towards the flow forwards 7, such as a concave formation 12.
  • the flap 4 comprises a first curved surface 16 having an edge area 13 for tightening contact against an inner wall 14 located in the tube structure 3, said wall 14 comprising a second curved surface 25 and said edge area 13 comprising a curved line 22.
  • FIG. 4 it is illustrated how the first curved surface 16 is contacting the second curved surface 25 in providing a maximum area of flow 2.
  • the flap 4 is movably provided to a point in the upper part 21 of the edge area 13 against the upper part 23 of the inner wall 14 by an attachment means 20.
  • the inner wall 14 comprises a tightening fold 15 for tightening against the edge area 13 having a tightening gasket 19 for tightening against the inner wall 14 or the tightening fold 15.
  • the flap 4 is closed, it is angled in an angle 17 in relation to a direction 18 towards the return flow 5.
  • the flap 4 is return resilient and movably provided against the inner wall 14 by a spring back portion 24.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Hydrology & Water Resources (AREA)
  • Combustion & Propulsion (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Check Valves (AREA)

Abstract

The invention relates to a nonreturn valve (1 ) intended to be used inside a tube structure (3), the area of flow (2) of said nonreturn valve (1 ) can vary by aid of a movably provided flap (4) located in the tube structure (3), which minimizes, closes or prevents a return flow (5) of fluid (6), which is fed as a flow forwards (7) in said tube structure (3), said tube structure (3) consists of e.g. a tube, a discharge pipe, a tube in process industry, the oil industry or the chemical industry. The flow forwards (7) and the return flow (5) take place mainly in a horizontal direction, and said flap (4) is movably provided in at least one place in its upper part (21 ) in the tube structure (3) at the same time as it by its own weight is suspending downwards, when no flow forwards (7) exists, and said flap (4), which is mainly stiff, comprises a first limiting surface (8) having at least one bulging portion (10) turned towards said return flow (5), when said return flow (5) is stronger than said flow forwards (7) or when said return valve (1 ) is closed, then the opposite second limiting surface (9) of said flap (4) being turned towards the flow forwards (7), but in the case said flow forwards (7) is stronger than said return flow (5) the flap (4) is pressed aside by the flow forwards (7) in providing an enlargement of area of flow (2) and an opening of said nonreturn valve (1 ).

Description

Nonreturn valve
The present invention relates to a nonreturn valve intended to be used inside a tube structure, the area of flow of said nonreturn valve can vary by aid of a movably provided flap located in the tube structure, which minimizes or prevents a return flow of fluid, which is fed as a flow forwards in said tube structure. The flap, which is stiff, has a first limiting surface with at least one portion bent outwards to receive pressure forces from said return flow. When said return flow is stronger than the flow forwards or when said nonreturn valve is closed, the flap is covering the whole area of flow. In this case the opposite limiting area of the flap is turned towards the flow forwards. But when the flow forwards is stronger that the return flow, said flap is pressed to the side by the flow forwards, so that the nonreturn valve is opened.
Existing structures on the market of this type are using different nonreturn valves which minimize or prevent a return flow of fluid in a tube structure, which is fed forwards in the tube structure, which consists of a e.g. a tube intended to be used in a discharge pipe, a pipe in process industry, oil industry, chemical industry and so on. The problems raised with these are that they do not resist high pressure over 0,5 bar, they do not tighten against said return flow quickly enough and effective or that their structure, when the nonreturn valve is open, take too large space, so that the area of flow will be smaller and slows down the speed and the volume of the flow forwards. Nonreturn valves having a movable ball, which moves from one space to at the side of the tube structure into area of flow for the opening and the closing, requires expensive structures and is minimize the flow forwards, when they are open. Nonreturn valves having resilient rubber flaps do not resist high pressure and have difficulties to totally tight at the closing. The document WO 98/10149 refers to a device to stop rats to climb upwards in a vertically running drainage pipe. This nonreturn valve is provided with two tooth formed flaps bent outwards, which are directed downwards and which are closed towards each other by aid of their own weight, when they are hinging downwards and are provided with an opening upwards for drainage of water in a direction downwards. If this structure should be used as a nonreturn valve in horizontally running pipes where the fluid flows in the bottom of the pipe during return flow and flow forwards, a closing can not be achieved until during stronger return flows, whereby the closing is slow and is not tightening until during higher pressure of the return flow. Two flaps also require large space from said area of flow in an open position. During closing a big risk occurs that the tightening surfaces of the flap will be displaced in a direction towards each other. The function will in this way become unsafe and the valve can easy be broken owing to an uneven load.
The object of the present invention is to solve the problem stated above by that the flap, which mainly is stiff, comprises a first limiting surface, which has a bulging portion, which can absorb high pressure loads from a return flow of fluid, when it is turned towards said return flow, so that only one flap is needed to cover an area of flow and so that said flap easier and faster is going to be opened, when a flow forwards of said fluid is stronger than said return flow.
Thanks to the invention a more simple, cheaper, tighter and safer nonreturn valve is provided having a better function with less movable parts. The nonreturn valve according to the invention has a area of flow, which can vary by aid of a movable flap provided in the tube structure, which minimizes or prevents a return flow of fluid, which is fed forwards in the tube structure consisting of e.g. a tube, a discharge pipe, a tube in process industry, the oil industry or the chemical industry. According to the invention the flap, which is stiff, comprises a first limiting surface having at lest one portion bent outwards in order to better be able to absorb loads from the return flow than what a flat surface can do. The bulged surface is curved towards the return flow, when the return flow is stronger than the flow forwards or when the nonreturn valve is closed. Only one flap is needed in this case in order to cover the whole area of flow. The opposite limiting surface of the flap is now turned towards the flow forwards. But when the flow forwards is stronger than the return flow, the flap is pressed aside of said flow forwards, so that an enlargement of the area of flow is achieved, so that the nonreturn valve is opened. According a preferred embodiment example of the invention the flap is stiff and sheet formed and made like a curved plate. The first limiting area comprises the bulged portion having a convex formation towards the return flow and the other, opposite limiting area comprises a concave formation towards the flow forwards. The convex formation is made as a first curved surface in order to be able to resist large pressure and is formed as a part of a mantle surface of a cylinder formation. The flap has an edge area, which functions as a tightening contact portion for contacting and tightening against an inner wall located in the tube structure, which connects to the same, when the nonreturn valve is closed. The inner wall has a second spherical surface, whereby the edge area has an extension like a curved line, which during the contact continuously follows the extension of the second curved surface in order to achieve a maximum tightening during the closing along the whole edge area. According to the invention a part of the edge area is movable anchored via a means of attachments e.g. a hinge function, link function, a fold area directly or indirectly against the inner wall. When the nonreturn valve is opened the whole flap is folded having the attachment means as a turning point to one side, so that the flap lies totally against or near contact against the second curved surface in order to achieve a maximum area of flow in the nonreturn valve. But when the nonreturn valve is closed the edge area contacts the inner wall.
In a second variant of the invention the inner walls have a tightening fold of a rubber like material for tightening against the edge area and against the attachment means. In this case also the attachment means can be fixed in the same.
In a third variant of the invention the first limiting surface is arranged in an angle which is smaller than 60° and preferable about 45° in relation to the direction of the return flow, When the flap is closed for achieving the best function, so that the first limiting area towards the return flow will become larger and must resist a larger load the smaller said angle is, at the same time as the pressure from the edge area towards the inner wall increases in order to achieve a better tightening and a faster opening and closing towards the flap.
According to a fourth variant of the invention the edge area can have a tightening seal preferably made of a resilient material such as rubber or plastic. When the tube structure is provided in a horizontal direction and when the flow forwards and the return flow take place in a horizontal direction, the flap is movably provided in the upper part of the edge area towards the upper part of the inner tube wall. The flap will then be suspended downwards by its own weight, whereby the edge area, when no flow forwards is existing, contacts the inner tube wall and when the return flow increases, a direct acting, fast functioning and effective tightening closing of said nonreturn valve is achieved, since the flap already is located in its closed position. When the tube structure extends in a direction upwards the flap needs help, when no return flow or flow forwards exist, to spring back to the closed position in order to be quickly into a position to meet a return flow. In order to manage this the flap is resiliently arranged towards the inner wall by aid of a spring back portion e.g. a helical spring, rubber body, so that it always is closed when flow forwards does not exist and tensioned when flow forwards exist. According to the invention the flap be made of metal, plastic, rubber or combinations of these materials with or without reinforcement of one or more reinforcing of e.g. carbon fibre, glass fibre, glass fibre reinforcing materials in or between the different materials. The manufacturing of said flap can be performed by e.g. casting or bending of the sheet unit by rolling, pressing and laminating of the different sheet units with interjacent reinforcement. The largest advantages with the invention are thus that a simple, cheep and good functioning nonreturn valve has been achieved, which opens and closes quickly, requires small space in the tube structure for maximum area of flow, resists high pressures and loads from the return flow and gives better tightening in the edge area. Only one flap is required to cover the whole area of flow, so that a better functioning and length of life is achieved, which results in lower maintenance and maintenance costs.
The invention is described closer below with help of some preferred embodiment examples in view of the drawings enclosed, in which
Fig. 1 shows a translucent perspective view of a nonreturn valve according to the invention,
Fig. 2 shows a longitudinal section through a nonreturn valve viewed from one side, in a closed (unbroken line of the flap) and an open position (broken line of the flap),
Fig. 3 shows a longitudinal section through a nonreturn valve viewed from below, in a closed (unbroken line of the flap) and an open position (broken line of the flap),
Fig. 4 shows a section through a nonreturn valve in an open position, with a maximum area of flow, and
Fig. 5 shows a longitudinal section through a horizontally extending nonreturn valve viewed from one side, in a closed position, whereby said flap comprises a tightening gasket and the inner wall comprises a tightening fold.
As can be seen from Fig. 1 and partly from Fig. 2 and 3, a nonreturn valve 1 is illustrated consisting of a tube structure 3 having a flap 4, which is able to increase and decrease its area of flow 2 of a return flow 5 of fluid 6, which is fed forwards in a flow forwards 7. The flap 4 comprises a first limiting area 8 having a bulging portion 10 turned towards the return flow 5, such as a convex formation 1 1 and a second limiting area 9 located opposite the first one, which is turned towards the flow forwards 7, such as a concave formation 12. The flap 4 comprises a first curved surface 16 having an edge area 13 for tightening contact against an inner wall 14 located in the tube structure 3, said wall 14 comprising a second curved surface 25 and said edge area 13 comprising a curved line 22.
As can be seen from Fig. 4 it is illustrated how the first curved surface 16 is contacting the second curved surface 25 in providing a maximum area of flow 2.
As can be seen from Fig. 5, it is illustrated that the flap 4 is movably provided to a point in the upper part 21 of the edge area 13 against the upper part 23 of the inner wall 14 by an attachment means 20. The inner wall 14 comprises a tightening fold 15 for tightening against the edge area 13 having a tightening gasket 19 for tightening against the inner wall 14 or the tightening fold 15. When the flap 4 is closed, it is angled in an angle 17 in relation to a direction 18 towards the return flow 5. The flap 4 is return resilient and movably provided against the inner wall 14 by a spring back portion 24.

Claims

Claims
1. Nonreturn valve intended to be used inside a tube structure (3), the area of flow (2) of said nonreturn valve ( 1 ) can vary by aid of a movably provided flap (4) located in the tube structure (3), which minimizes, closes or prevents a return flow (5) of fluid (6), which is fed as a flow forwards (7) in said tube structure (3), said tube structure (3) consists of e.g. a tube, a discharge pipe, a tube in process industry, the oil industry or the chemical industry, characterized in that the flow forwards (7) and the return flow (5) take place mainly in a horizontal direction, and said flap (4) is movably provided in at least one place in its upper part (21) in the tube structure (3) at the same time as it by its own weight is suspending downwards when no flow forwards (7) exists and said flap (4), which is mainly stiff, comprises a first limiting surface (8) having at least one bulging portion ( 10) turned towards said return flow (5) when said return flow (5) is stronger than said flow forwards (7) or when said return valve
(1 ) is closed, then the opposite second limiting surface (9) of said flap (4) being turned towards the flow forwards (7), but in the case said flow forwards (7) is stronger than said return flow (5) the flap (4) is pressed aside by the flow forwards (7) in providing an enlargement of area of flow
(2) and an opening of said nonreturn valve (1 ).
2. Nonreturn valve according to claim 1 , characterized in that the flap (4) is sheet formed, the bulged portion (10) consists of at least one convex formation (1 1 ) towards said return flow (7) and that the opposite limiting surface (9) comprises at least one concave formation (12) towards said return flow (7).
3. Nonreturn valve according to claim 2, characterized in that the whole flap (4) consists of only one bulging portion (10) in the form of a first curved surface (16) and is provided with at least one edge area (13), which functions as a tightening contact portion for contacting and tightening direct or indirect against an inner wall (14) located in the tube structure (3), said wall ( 14) has a second curved surface (25), the edge area (13) having an extension like a curved line (22), which during the contact continuously follows the extension of the second curved surface (25) in order to achieve a maximum tightening.
4. Nonreturn valve according to claim 3, characterized in that the edge area (13) is directly or indirectly fixed to and movably provided via at least one attachment means (20) e.g. a hinge function, link function, a fold area, to at east one place against the inner wall ( 14), whereby when the nonreturn valve (4) is opened and has been folded aside, a mainly portion of the first bulged surface (16) is contacting or in a near contact with the second bulged surface (25), said bulged surfaces (16,25) like e.g. a portion of a mantle surface from a cylinder formation in providing a maximum area of flow (2) but when the nonreturn valve ( 1 ) is closed a main portion of said edge area (13) contacts direct or indirect the inner wall (14).
5. Nonreurn valve according to claim 4, characterized in that at least one of the inner walls (14) have at least one tightening fold (15), preferably of a rubber like material for tightening and/or anchoring in/at/around/against the attachment means (20) and/or against one portion of said edge area (13).
6. Nonreturn valve according to any of the preceding claims 1 -5, characterized in that the first limiting surface (8), when the flap (4) is closed, is arranged in an angle (17) in relation to a direction (18) towards the return flow (5), which is smaller than 60° and preferable about 45°, the first limiting area towards the return flow being larger and resisting a larger load the smaller said angle (17) is, at the same time as the pressure from the edge area (13) towards the inner wall (14) is increasing and a better tightening and a faster opening and closing function towards the flap is provided.
7. Nonreturn valve according to any of the preceding claims 3-6, characterized in that at least one portion of said edge area (13) comprises a tightening gasket (19), preferably made of a resilient material such as rubber or plastic, which also the attachment means (20) can be fixed to, when the same is provided in the edge area (13).
PCT/SE2006/001310 2005-12-02 2006-11-17 Nonreturn valve WO2007064270A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE0502635A SE0502635L (en) 2005-12-02 2005-12-02 Check valve
SE0502635-6 2005-12-02

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WO2007064270A1 true WO2007064270A1 (en) 2007-06-07

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Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011731A1 (en) * 2010-09-10 2012-03-15 Sgs Aqua Technologies Gmbh Damming device for preventing back flow of liquid in channel, has valve swingably supported in interior of channel around axis and between stowed and folded positions, where check valve is formed three-dimensionally and hemi-cyclically
WO2012161634A1 (en) * 2011-05-20 2012-11-29 Burstroem Bertil Ingvar Device for achieving single-direction flow in channels, pipes, etc
GB2491633A (en) * 2011-06-10 2012-12-12 Declan Martin Melia Apparatus to prevent the free movement of rats inside sewer /drainage pipes
DE102012205304A1 (en) 2012-03-30 2013-10-02 Hermann Reitthaler Hoch- und Tiefbau GmbH Back-flow preventer for arrangement in waste water pipe that is utilized for discharging household waste water into drainage ditch, has surface segments for covering opening, where edges of segments tilt against each other
DK178206B1 (en) * 2014-02-18 2015-08-17 Dannozzle Aps Flap gate
US10914489B2 (en) * 2016-09-27 2021-02-09 Panasonic Intellectual Property Management Co., Ltd. Shutter structure
US10948093B2 (en) 2018-07-07 2021-03-16 Hamilton Sunstrand Corporation Check valves

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Publication number Priority date Publication date Assignee Title
US385292A (en) * 1888-06-26 Foueths to dudley j
US2733889A (en) * 1956-02-07 Valve and fluid control conduit
US4095615A (en) * 1976-05-21 1978-06-20 Ramco Manufacturing, Inc. Check valve and siphon tube assembly employing same
SE438898B (en) * 1983-02-16 1985-05-13 Soederhamn Ind Arbetshygien Ab Ventilation tool for cross-sectional circular piping

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US385292A (en) * 1888-06-26 Foueths to dudley j
US2733889A (en) * 1956-02-07 Valve and fluid control conduit
US4095615A (en) * 1976-05-21 1978-06-20 Ramco Manufacturing, Inc. Check valve and siphon tube assembly employing same
SE438898B (en) * 1983-02-16 1985-05-13 Soederhamn Ind Arbetshygien Ab Ventilation tool for cross-sectional circular piping

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011011731A1 (en) * 2010-09-10 2012-03-15 Sgs Aqua Technologies Gmbh Damming device for preventing back flow of liquid in channel, has valve swingably supported in interior of channel around axis and between stowed and folded positions, where check valve is formed three-dimensionally and hemi-cyclically
WO2012161634A1 (en) * 2011-05-20 2012-11-29 Burstroem Bertil Ingvar Device for achieving single-direction flow in channels, pipes, etc
GB2491633A (en) * 2011-06-10 2012-12-12 Declan Martin Melia Apparatus to prevent the free movement of rats inside sewer /drainage pipes
GB2491633B (en) * 2011-06-10 2017-07-05 Martin Melia Declan Apparatus to prevent the free movement of rats inside sewer/drainage pipes
DE102012205304A1 (en) 2012-03-30 2013-10-02 Hermann Reitthaler Hoch- und Tiefbau GmbH Back-flow preventer for arrangement in waste water pipe that is utilized for discharging household waste water into drainage ditch, has surface segments for covering opening, where edges of segments tilt against each other
DK178206B1 (en) * 2014-02-18 2015-08-17 Dannozzle Aps Flap gate
US10914489B2 (en) * 2016-09-27 2021-02-09 Panasonic Intellectual Property Management Co., Ltd. Shutter structure
US10948093B2 (en) 2018-07-07 2021-03-16 Hamilton Sunstrand Corporation Check valves

Also Published As

Publication number Publication date
SE528528C2 (en) 2006-12-05
SE0502635L (en) 2006-12-05

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