EP0479824A1 - Butterfly-type check valve - Google Patents

Butterfly-type check valve

Info

Publication number
EP0479824A1
EP0479824A1 EP90909429A EP90909429A EP0479824A1 EP 0479824 A1 EP0479824 A1 EP 0479824A1 EP 90909429 A EP90909429 A EP 90909429A EP 90909429 A EP90909429 A EP 90909429A EP 0479824 A1 EP0479824 A1 EP 0479824A1
Authority
EP
European Patent Office
Prior art keywords
shaft
plate
check valve
valve
secured
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.)
Ceased
Application number
EP90909429A
Other languages
German (de)
French (fr)
Inventor
Larry K. Ball
Marshall U. Hines
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.)
Honeywell International Inc
Original Assignee
AlliedSignal Inc
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
Priority claimed from US07/395,234 external-priority patent/US4964422A/en
Application filed by AlliedSignal Inc filed Critical AlliedSignal Inc
Publication of EP0479824A1 publication Critical patent/EP0479824A1/en
Ceased legal-status Critical Current

Links

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
    • 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
    • F16K1/222—Shaping of the valve 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
    • 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
    • F16K1/221—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 specially adapted operating means therefor
    • 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
    • F16K1/226—Shaping or arrangements of the sealing
    • F16K1/2261—Shaping or arrangements of the sealing the sealing being arranged on the valve 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
    • 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
    • F16K15/035—Check valves with guided rigid valve members with a hinged closure member or with a pivoted closure member with a plurality of valve members
    • 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
    • F16K27/00—Construction of housing; Use of materials therefor
    • F16K27/02—Construction of housing; Use of materials therefor of lift valves
    • F16K27/0209—Check valves or pivoted valves
    • F16K27/0218—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
    • F16K2200/00—Details of valves
    • F16K2200/40—Bleeding means in closed position of the valve, e.g. bleeding passages
    • F16K2200/401—Bleeding means in closed position of the valve, e.g. bleeding passages arranged on the closure member

Definitions

  • the present invention relates generally to check valves. More specifically, the invention relates to check valves which are operable to open in response to flow through a pilot valve, and which comprise a plate-like main valve member which is secured to a shaft in such manner tha the valve member is revolvable and translatable relative to the shaft.
  • FIG. 1 of the accompanying drawings schematically illustrates a conventional butterfly valve arrangement 10 i which a butterfly plate 12 positioned in a duct 14 is rotated about an axis defined by a spindle or shaft 16 in order to vary the rate at which fluid flows through the duct.
  • the plate 12 is rotated via torque applie by an external actuator 18 through the shaft 16.
  • a series of arrows 20 generally illustrates the static pressure profile resulting from the aerodynamic or hydrodynamic forces acting on the butterfly plate 12.
  • the overall effect of the static pressure may be represented by a center of pressure (indicated by the arrow 22) which tend to force the plate 12 to the closed position. This force must be countered or overcome by energy supplied to the actuator 18 in order to retain the position of the plate 12 or further open the valve 10.
  • the center of pressure 22 in order to lower the externally-supplied energy required to match or exceed the hydrodynamic forces acting on the plate 12, the center of pressure 22 should be favorably altered in relation to the axis of rotation. That is, either the center of pressure 22 should be aligned with or moved closer to the shaft 16, or the shaft should be aligned with or moved closer to the center of pressure.
  • the above-referenced application teaches, among other things, that if in the design of a butterfly valve one provides for relative translational movement between the shaft 16 and the plate 12, then the bulk of the energy required to torque the plate can be provided by the aero ⁇ dynamic forces acting thereon.
  • the present invention employs this and other teaching contained in said applica ⁇ tion to provide a butterfly-type check valve.
  • the invention is a butterfly-type check valve.
  • the salient features of the invention in its broadest aspect are two.
  • the first is that the butterfly plate is secured to the shaft in such manner that the plate is capable of revolutionary movement relative to the shaft, whereby the revolutionary movement effects translation of the plate relative to the shaft.
  • the second is the provision of a secondary check valve or pilot valve carried on the plate.
  • the importance of the pilot valve is that it provides a means for. initially opening the check valve in response to aerodynamic forces which might otherwise tend to keep the butterfly plate in a closed position.
  • the importance of the first feature is that as the plate revolves and translates relative to the shaft, it also translates relative to a pivot line about which the plate can turn. Thus, the position of the pivot line relative to the plate varies with the angle of rotation of the plate.
  • FIG. 1 is a schematic illustration of a conven ⁇ tional butterfly valve arrangement.
  • FIG. 2(a)-2(d) schematically illustrate the operation of a butterfly-type check valve in accordance with the invention.
  • FIG. 3 is a cross-sectional view of the preferred embodiment of the invention and is taken along line 3-3 of FIG. 4.
  • FIG. 4 is a generally elevational, partially cross-sectional view taken along line 4-4 of FIG. 3.
  • FIG. 5 is a cross-sectional view as in FIG. 3 and illustrates the check valve in an open position.
  • FIGS. 2A through 2D schematically illustrate the principles on which the check valve of the invention oper- ates.
  • the valve 30 is shown in a closed posi ⁇ tion.
  • the desired direction of fluid flow (indicated by arrow 32) is from left to right.
  • the valve 30 comprises a • shaft 34 defining a longitudinal axis 35, a plate-like valve member 36 (hereinafter "plate") that is secured to the shaft in such manner that the plate is capable of revolutionary and translational movement relative to the shaft, and a pilot valve 38 secured to and carried by the plate.
  • plate plate-like valve member 36
  • pilot valve 38 secured to and carried by the plate.
  • the center of pressure 22 associated with the aerodynamic forces acting on the plate 14 is aligned with the pivot point 40 about which the plate turns, as is illustrated in FIG.
  • the pivot line 40 can be viewed as extending into the sheet in a direction parallel to both the axis 35 and the plate 36) .
  • the center of pressure 22 moves upward, as is illustrated in FIG. 2B.
  • the plate 36 rotates in a clockwise direction, as is illustrated in FIG. 2C.
  • the plate 36 rotates, it also undergoes revolu ⁇ tionary movement relative to the shaft 34. This revolutiona movement effects translational movement of the plate rela ⁇ tive to the shaft.
  • the area (indicated in single dimension by arrows 42 and 44) of the plate 36 is the same on each side of the pivot line 40.
  • FIG. 2A the area (indicated in single dimension by arrows 42 and 44) of the plate 36 is the same on each side of the pivot line 40.
  • FIG. 42 and 44 the area (indicated in single dimension by arrows 42 and 44) of the plate 36 is the same on each side of the pivot line 40.
  • FIG. 42 and 44 the area (indicated in single dimension by
  • the area 42 above the pivot line 40 is greater than the area 44 below the pivot line.
  • the valve 30 will continue to open until the center of pressure 22 is again aligned with the pivot line 40, as is illustrated in FIG. 2D.
  • the downward movement of the center of pressure 22 may be attributable to a number of factors.
  • One such factor may be flow restric- tion by the shaft 34.
  • Another is that the aerodynamic forces acting against the edge of the plate 36 become more influential as the plate moves to higher angles of rotation (angles of rotation being indicated generally by the curved arrow 45).
  • Yet another is the aerodynamic force acting on the gating mechanism 47 of the pilot valve 38.
  • a shaft 34 is formed from two axially-extending components to accommodate rigid securement of two spaced pinion gears 48, 50 to the shaft, and to provide for installation of a tubular sleeve 52.
  • the sleeve 52 surrounds a centrally-disposed, recessed portion 54 of the shaft 34 and is freely rotatable there ⁇ about via bearings 56.
  • a plate 36 has two rectangular recesses (not shown) into which two rack gears 58, 60 are positioned and rigidly secured to the plate.
  • the plate 36 is provided with a suitable rim seal (not shown) and is positioned parallel to the shaft 34 such that the latter equally bisects the plate and the rack gears 58, 60 engage the pinion gears 48, 50.
  • the gears 48, 50, 58, 60 and recesses are dimensioned to ensure that the contact points between the gears are nominally flush with the surface 62 of the plate 36.
  • a generally C-shaped bracket 64 envelops the shaft 34 and is welded at its ends to the plate 36.
  • the bracket 64 is dimensioned to accom- modate the expected range of translational movement of the plate 36 relative to the shaft 34, and to ensure that its distal inner surface 66 abuts the outer surface of the sleeve 52.
  • the plate 36 has a hole 68 formed therethrough.
  • a reed, hinged flap 70, or functionally similar gating device is secured to the plate 36 so that it covers the hole 68.
  • the flap 70 and hole 68 cooperate to form the pilot valve 38.
  • the pilot valve 38 is essentially a second ary check valve and functions to effect a change in the location of the center of pressure 22 (FIG. 2) so that the check valve 30 opens when flow proceeds in the desired direction 32.
  • a stop 72 secured to the flap 70 limits movement so that the flap can close when flow proceeds in the opposite direction 46.
  • the shaft 34 is rigidly secured to a duct 74 so that it extends transversely across an elongate flow path 76 which is defined by the duct, and does not rotate about its axis 35 (FIG. 2).
  • the plate 36 would abut the shaft 34 along a pivot line 40 (FIG. 2) extending across the plate.
  • a pivot line 40 (FIG. 2) extending across the plate.
  • the illustrated embodiment incorporates mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34.
  • mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34.
  • mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34.
  • mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34.
  • mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34.
  • three stri of a flexible material are wound around the shaft 34 and suitably secured to both the shaft and the plate 36. Two outer strips would be wound in one direction and a central strip would be wound in an opposite direction. Such an arrangement would
  • the effect of the flap 70 on the fully-open angl has not been determined. However, a number of possibiliti are contemplated for either minimizing this effect or pro ⁇ viding a particular fully-open angle in a given design. These include opening the flap 70 from the opposite side o the hole 68 (i.e. as viewed in FIG. 5 the flap would open downwardly instead of upwardly); appropriately dimensionin the flap and/or the stop 72; using a very thin reed instea of the flap; and in applications where the plate 36 is sufficiently thick, securing the flap to the plate inside the hole.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanically-Actuated Valves (AREA)
  • Check Valves (AREA)
  • Lift Valve (AREA)

Abstract

Un clapet du genre robinet papillon (30) se sert d'un clapet secondaire (38) monté sur la plaque du clapet (36). Ladite plaque (36) peut effectuer des mouvements rotatifs ainsi que des mouvements de translation par rapport à la tige du pivot (34). Lors du fonctionnement, le clapet (30) s'ouvre en fonction d'une modification des forces aérodynamiques agissant sur la plaque (36), ladite modification étant effectuée en fonction de l'ouverture du clapet secondaire (38). Lors de la rotation de la plaque du clapet (36) vers une position ouverte, son mouvement de révolution par rapport à la tige (34) entraîne un changement des emplacements des pointes de pivot (40) par rapport à la surface (62) de la plaque. Une modification des zones (42, 44) de la surface (62) des deux côtés desdites pointes de pivot étant ainsi obtenue, les forces aérodynamiques poussent ledit clapet (30) à s'ouvrir davantage.A butterfly valve type valve (30) utilizes a secondary valve (38) mounted on the valve plate (36). Said plate (36) can perform rotational movements as well as translational movements with respect to the pivot rod (34). In operation, the valve (30) opens in response to a change in the aerodynamic forces acting on the plate (36), said change being effected in response to the opening of the secondary valve (38). As the valve plate (36) is rotated to an open position, its revolving movement relative to the stem (34) causes the locations of the pivot tips (40) to change relative to the surface (62) of the valve. the plaque. A modification of the areas (42, 44) of the surface (62) on both sides of said pivot tips being thus obtained, the aerodynamic forces cause said valve (30) to open further.

Description

BUTTERFLY-TYPE CHECK VALVE
TECHNICAL FIELD
The present invention relates generally to check valves. More specifically, the invention relates to check valves which are operable to open in response to flow through a pilot valve, and which comprise a plate-like main valve member which is secured to a shaft in such manner tha the valve member is revolvable and translatable relative to the shaft.
The invention employs various aspects of the teaching contained in U.S. Patent Application Serial No. 374,897 entitled "Butterfly Valves With Actuators Carried O Valve Plate", which was filed on June 30, 1989. The dis- closure thereof is incorporated herein by reference.
BACKGROUND OF THE INVENTION
FIG. 1 of the accompanying drawings schematically illustrates a conventional butterfly valve arrangement 10 i which a butterfly plate 12 positioned in a duct 14 is rotated about an axis defined by a spindle or shaft 16 in order to vary the rate at which fluid flows through the duct. Typically, the plate 12 is rotated via torque applie by an external actuator 18 through the shaft 16.
A series of arrows 20 generally illustrates the static pressure profile resulting from the aerodynamic or hydrodynamic forces acting on the butterfly plate 12. The overall effect of the static pressure may be represented by a center of pressure (indicated by the arrow 22) which tend to force the plate 12 to the closed position. This force must be countered or overcome by energy supplied to the actuator 18 in order to retain the position of the plate 12 or further open the valve 10.
As a general matter, in order to lower the externally-supplied energy required to match or exceed the hydrodynamic forces acting on the plate 12, the center of pressure 22 should be favorably altered in relation to the axis of rotation. That is, either the center of pressure 22 should be aligned with or moved closer to the shaft 16, or the shaft should be aligned with or moved closer to the center of pressure.
The above-referenced application teaches, among other things, that if in the design of a butterfly valve one provides for relative translational movement between the shaft 16 and the plate 12, then the bulk of the energy required to torque the plate can be provided by the aero¬ dynamic forces acting thereon. The present invention employs this and other teaching contained in said applica¬ tion to provide a butterfly-type check valve.
DISCLOSURE OF THE INVENTION
The invention is a butterfly-type check valve.
The salient features of the invention in its broadest aspect are two. The first is that the butterfly plate is secured to the shaft in such manner that the plate is capable of revolutionary movement relative to the shaft, whereby the revolutionary movement effects translation of the plate relative to the shaft. The second is the provision of a secondary check valve or pilot valve carried on the plate. The importance of the pilot valve is that it provides a means for. initially opening the check valve in response to aerodynamic forces which might otherwise tend to keep the butterfly plate in a closed position. The importance of the first feature is that as the plate revolves and translates relative to the shaft, it also translates relative to a pivot line about which the plate can turn. Thus, the position of the pivot line relative to the plate varies with the angle of rotation of the plate. The advantages thereby provided are better understood by reference to the following description, which includes the appended claims and accompanying drawings.
DESCRIPTION OF THE DRAWINGS
FIG. 1 is a schematic illustration of a conven¬ tional butterfly valve arrangement.
FIG. 2(a)-2(d) schematically illustrate the operation of a butterfly-type check valve in accordance with the invention.
FIG. 3 is a cross-sectional view of the preferred embodiment of the invention and is taken along line 3-3 of FIG. 4.
FIG. 4 is a generally elevational, partially cross-sectional view taken along line 4-4 of FIG. 3.
FIG. 5 is a cross-sectional view as in FIG. 3 and illustrates the check valve in an open position.
BEST MODE FOR CARRYING OUT THE INVENTION
FIGS. 2A through 2D schematically illustrate the principles on which the check valve of the invention oper- ates. In FIG. 2A, the valve 30 is shown in a closed posi¬ tion. The desired direction of fluid flow (indicated by arrow 32) is from left to right. The valve 30 comprises a • shaft 34 defining a longitudinal axis 35, a plate-like valve member 36 (hereinafter "plate") that is secured to the shaft in such manner that the plate is capable of revolutionary and translational movement relative to the shaft, and a pilot valve 38 secured to and carried by the plate. Ini¬ tially, with the pilot valve 38 closed, the center of pressure 22 associated with the aerodynamic forces acting on the plate 14 is aligned with the pivot point 40 about which the plate turns, as is illustrated in FIG. 2A (The pivot line 40 can be viewed as extending into the sheet in a direction parallel to both the axis 35 and the plate 36) . As fluid pressure forces the pilot valve 38 open, the center of pressure 22 moves upward, as is illustrated in FIG. 2B. In response to the change in aerodynamic forces, the plate 36 rotates in a clockwise direction, as is illustrated in FIG. 2C. As the plate 36 rotates, it also undergoes revolu¬ tionary movement relative to the shaft 34. This revolutiona movement effects translational movement of the plate rela¬ tive to the shaft. Thus, in FIG. 2A, the area (indicated in single dimension by arrows 42 and 44) of the plate 36 is the same on each side of the pivot line 40. However, in FIG. 2C, the area 42 above the pivot line 40 is greater than the area 44 below the pivot line. Assisted by the fact that the aerodynamic forces can act on a greater area 42 above the pivot line 40, the valve 30 will continue to open until the center of pressure 22 is again aligned with the pivot line 40, as is illustrated in FIG. 2D. The downward movement of the center of pressure 22 may be attributable to a number of factors. One such factor may be flow restric- tion by the shaft 34. Another is that the aerodynamic forces acting against the edge of the plate 36 become more influential as the plate moves to higher angles of rotation (angles of rotation being indicated generally by the curved arrow 45). Yet another is the aerodynamic force acting on the gating mechanism 47 of the pilot valve 38. If fluid flow is reversed as indicated by the dashed arrow 46, the pilot valve 38 is forced shut and the aerodynamic forces, assisted by the fact that the area 42 is greater than the area 44, rotate the plate 36 to the closed position indi¬ cated by FIG. 2A.
Referring now to FIGS. 3 and 4 a shaft 34 is formed from two axially-extending components to accommodate rigid securement of two spaced pinion gears 48, 50 to the shaft, and to provide for installation of a tubular sleeve 52. The sleeve 52 surrounds a centrally-disposed, recessed portion 54 of the shaft 34 and is freely rotatable there¬ about via bearings 56. A plate 36 has two rectangular recesses (not shown) into which two rack gears 58, 60 are positioned and rigidly secured to the plate. The plate 36 is provided with a suitable rim seal (not shown) and is positioned parallel to the shaft 34 such that the latter equally bisects the plate and the rack gears 58, 60 engage the pinion gears 48, 50. To minimize binding, the gears 48, 50, 58, 60 and recesses are dimensioned to ensure that the contact points between the gears are nominally flush with the surface 62 of the plate 36. A generally C-shaped bracket 64 envelops the shaft 34 and is welded at its ends to the plate 36. The bracket 64 is dimensioned to accom- modate the expected range of translational movement of the plate 36 relative to the shaft 34, and to ensure that its distal inner surface 66 abuts the outer surface of the sleeve 52. The plate 36 has a hole 68 formed therethrough. A reed, hinged flap 70, or functionally similar gating device is secured to the plate 36 so that it covers the hole 68. The flap 70 and hole 68 cooperate to form the pilot valve 38. The pilot valve 38 is essentially a second ary check valve and functions to effect a change in the location of the center of pressure 22 (FIG. 2) so that the check valve 30 opens when flow proceeds in the desired direction 32. A stop 72 secured to the flap 70 limits movement so that the flap can close when flow proceeds in the opposite direction 46. The shaft 34 is rigidly secured to a duct 74 so that it extends transversely across an elongate flow path 76 which is defined by the duct, and does not rotate about its axis 35 (FIG. 2).
In operation, when flow proceeds in the desired direction 32, pressure exerted by the fluid on the flap 70 causes the pilot valve 38 to open, thus permitting flow through the pilot valve. This effectively moves the center of pressure 22 above the pivot line 40 (FIG. 2 in the illustrated embodiment the pivot line is defined by the points of contact between the rack and pinion gears 48, 50, 58, 60). Consequently, the plate 36 rotates clockwise as viewed in FIGS. 3 and 5.
Since the axis of rotation of the plate 36 is not coincident with the axis 35 (FIG. 2) of the shaft 34, rotation is accompanied by revolutionary movement of the plate relative to the axis 35, which in turn is accompanied by translational movement of the plate relative to the axis
35. In effect, this can be viewed as a rolling motion of the plate 36 around the shaft 34.
* In the simplest form of the invention, the plate 36 would abut the shaft 34 along a pivot line 40 (FIG. 2) extending across the plate. However, it is desirable to ensure that for a particular angle of rotation of the plate
36, there is a repeatable, particular degree of transla- tional movement of the plate relative to the shaft 34. Accordingly, the illustrated embodiment incorporates mechan ical timing means in the form of rack and pinion gears 48, 50, 58, 60 which prevent slippage between the plate 36 and the shaft 34. As an alternative to the illustrated timing means, one could employ an arrangement in which three stri of a flexible material are wound around the shaft 34 and suitably secured to both the shaft and the plate 36. Two outer strips would be wound in one direction and a central strip would be wound in an opposite direction. Such an arrangement would be similar in operation to that of a reel-type window shade.
Returning now to the operation of the check valv 30 and referring to FIGS. 2, 3, 4, and 5, as the plate 36 rotates clockwise the teeth of the rack gears 58, 60 seque tially engage the teeth of the pinion gears 48, 50, thus preventing slippage as the pivot line 40 moves clockwise around the stationary shaft 34 and downward along the plat 36. The area 42 above the pivot line 40 increases with increasing angles of rotation 45 until an angle is reached at which the center of pressure 22 is again aligned with t pivot line 40. A test has demonstrated that for a plate 3 with no protrusion (such as the flap 70), a "fully open" angle of rotation 45 of slightly less than ninety degrees can be achieved.
The effect of the flap 70 on the fully-open angl has not been determined. However, a number of possibiliti are contemplated for either minimizing this effect or pro¬ viding a particular fully-open angle in a given design. These include opening the flap 70 from the opposite side o the hole 68 (i.e. as viewed in FIG. 5 the flap would open downwardly instead of upwardly); appropriately dimensionin the flap and/or the stop 72; using a very thin reed instea of the flap; and in applications where the plate 36 is sufficiently thick, securing the flap to the plate inside the hole.
When flow proceeds in the opposite direction 46, aerodynamic forces act to close the flap 70. The center of pressure associated with these forces is so located relative to the pivot line 40 that the closing torque applied to the plate 36 is even greater than would obtain if the pivot line were centered relative to the plate. Consequently, the plate 36 is quickly rotated in a counterclockwise direction, with the rack gears 58, 60 rolling around the pinion gears 48, 50, until it reaches the closed position indicated by FIG. 3. If the plate 36 transitorily overshoots the closed position, the lower area 44 is made transitorily greater than the upper area 42 and the aerodynamic forces act to return the plate to the closed position. Conversely, if the plate 36 for any reason transitorily rotates in a clockwise direction while flow is proceeding from right to left, the upper area 42 is made transitorily greater than the lower area 44, and again the plate 36 is returned to the closed position.
The reader should understand that the foregoing text and accompanying drawings are not intended to restrict the scope of the invention to specific details which are ancillary to the teaching contained herein. Accordingly, the invention should be construed as broadly as is consis¬ tent with the following claims and their equivalents.

Claims

WHAT IS CLAIMED IS:
1. A check valve,characterized in that the check valve comprises in combination: a duct defining a flow path for fluid; a shaft supported across said duct and extending across said flow path; a plate-like member having a hole formed there¬ through; said member being secured to said shaft in such manner that said member is revolvable and translatable relative to said shaft; and a secondary check valve carried upon said member for permitting flow through said hole in one direction and substantially preventing flow through said hole in an opposite direction, whereby in operation said check valve opens in response to a change in forces exerted by said fluid on said member, said change occurring when said secondary check valve is opened in response to forces exerted thereon by said fluid.
2. The invention of Claim 1 further comprising a pinion gear secured to said shaft and a rack gear secured to said member and engaging said pinion gear.
3. The invention of Claim 1 further comprising a tubular sleeve surrounding a centrally disposed portion of said shaft and being freely rotatable about said portion.
4. The invention of Claim 1 wherein said shaft is rigidly secured to said duct.
5. The invention of Claim 1 wherein said seconda check valve comprises a second plate-like member movably secured to said plate-like member.
6. The invention of Claim 1 wherein said member contacts said shaft along a pivot line parallel to said axis, said revolutionary movement of said member effecting revolutionary movement of said pivot line relative to said axis.
7. The invention of Claim 6 further comprising a rack gear secured to said member and a pinion gear secured to said shaft and engaging said rack gear for inhibiting slippage during said revolutionary movement.
8. The invention of Claim 7 wherein said shaft is secured to said duct so that said shaft cannot rotate about said axis.
EP90909429A 1989-06-30 1990-06-05 Butterfly-type check valve Ceased EP0479824A1 (en)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US37489789A 1989-06-30 1989-06-30
US374897 1989-06-30
US07/395,234 US4964422A (en) 1989-08-17 1989-08-17 Butterfly-type check valve
US395234 1989-08-17

Publications (1)

Publication Number Publication Date
EP0479824A1 true EP0479824A1 (en) 1992-04-15

Family

ID=27006822

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90909429A Ceased EP0479824A1 (en) 1989-06-30 1990-06-05 Butterfly-type check valve

Country Status (6)

Country Link
EP (1) EP0479824A1 (en)
JP (1) JPH04506694A (en)
AU (1) AU5834090A (en)
CA (1) CA2058629A1 (en)
IL (1) IL94560A0 (en)
WO (1) WO1991000463A1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4304649A1 (en) * 1993-02-16 1994-09-01 Alfons Dr Uhl Automatic shut-off device for a gas-carrying pipe
DE10014462B4 (en) 2000-03-23 2011-12-08 Deutsche Telekom Ag Method and monitoring system for monitoring at least one subscriber line
US7325569B2 (en) * 2005-04-25 2008-02-05 Honeywell International, Inc. Butterfly valve with integral split flapper relief valve
US10203703B2 (en) * 2014-03-04 2019-02-12 Mi Valve, Llc Airflow balancing valve for HVAC systems

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2796082A (en) * 1955-02-14 1957-06-18 Interstate Engineering Corp Pilot actuated butterfly valve
US3498583A (en) * 1966-10-07 1970-03-03 Martin Marietta Corp Compound movement butterfly valve
JPS5466405A (en) * 1977-11-07 1979-05-29 Hitachi Ltd Insulation processing winding for machine
DE3677908D1 (en) * 1985-05-30 1991-04-11 Fritz Schmidt SHUT-OFF ORGAN FOR PIPELINES.

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9100463A1 *

Also Published As

Publication number Publication date
JPH04506694A (en) 1992-11-19
CA2058629A1 (en) 1990-12-31
AU5834090A (en) 1991-01-17
WO1991000463A1 (en) 1991-01-10
IL94560A0 (en) 1991-03-10

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