CA1078704A - Non-return valve - Google Patents
Non-return valveInfo
- Publication number
- CA1078704A CA1078704A CA301,116A CA301116A CA1078704A CA 1078704 A CA1078704 A CA 1078704A CA 301116 A CA301116 A CA 301116A CA 1078704 A CA1078704 A CA 1078704A
- Authority
- CA
- Canada
- Prior art keywords
- closing
- closing part
- valve
- spring
- return valve
- 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.)
- Expired
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
- 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
- F16K15/036—Dual valve members with hinges crossing the flow line substantially diametrical
-
- 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
- F16K1/223—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 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
- 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Check Valves (AREA)
- Lift Valve (AREA)
- Binders And Loading Units For Sheaves (AREA)
Abstract
Abstract of the Disclosure A non-return valve is disclosed which has a valve housing,a valve seat, at least one closing part co-operating with the valve seat and mounted pivotably In the housing, and at least one closing spring held stationarily in the housing and comprising at least one pivotable operating arm which engages with the closing part. The closing spring is arranged in the inlet side of the internal chamber of the valve housing and a connecting means is provided which connects the operating arm to the closing part under tension in the direction in which the closing part pivots. The closing part and the operating arm are permitted to move relatively in the longitudinal direction of the operating arm.
Description
~ 1078704 :
The invention relates to a non-return valve, having a valve housing, a valve seat, at least one closing part co-operating with the latter ant mounted pivotably in said housing, and at least one closing spring held stationarily therein ant comprising at least one pivotable operating arm engaging with the closing part, in known non-return valves of this kind, the closing spring is in the form of a torsion spring, the coils of which are mounted upon the pivot axis of the closing part or parts, the ends of the said coils extending at right angles to the axi~ thereof and forming two legs, one or both of which engage with the said closing part or parts. -The said spring thus exerts upon the said closing part or parts a closing torque which increases with the opening angle. If the non-return valve ;
^ is to be fully opened, therefore, the load applied by the flow must be relatively high and the flow volume must be large, but this is not always the case under varying operating conditions. Non-return valves of this -kind therefore operate at certain times in partly open positions, and this is apt to cause chatter and flow noises. Flow losses are also relatively large.
It is the purpose of the invention to provide a non-return valve of the kind mentioned in the opening paragraph hereof in which the closing spring exerts upon the closing part or parts a force which either increases only slightly with the opening angle, or even decreases therewith, so that a fully open non-return valve is possible even when the flow volume is relatively small.
According to the invention there is provided a non-return valve having a valve housing and a valve seat, at least one closing part co-operating with the latter and mounted pivotably in the said housing, and at least one closing spring held stationarily therein and comprising at least one pivotable operating arm engaging with the said closing part, ~ characterized in that the closing spring is arranged in the inlet side ; 30 of the internal chamber of the valve housing; and in that a connecting means is provided which connects the operating arm to the closing part to ; bias the closing part towards the valve seat, said connecting means ., ~ A
``` 10`78'7'0~ , ~
.; ~
comprising a slite connection that permits the point of engagement between the closing part and the operating arm to move towards and : `~
away from the pivot of one of the operating arms ant the closing part, during pivotal movement of the closing part.
This arrangement of the closing spring displaces the pivot axis of the operating arm of the closing spring on the inlet side in front of the :
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pivot axis of the closing part. During the opening procedure~ this either ~ .
lengthens the effective lever arm on the spring side or shortens it on the closing-part side, the said lever arm applying to the said closing part the ~ ~;
load produced by the closing spring. This change in the length of the lever arm is superimposed over the unavoidable increase in the torque applied by the closing spring as the valve opens, thus making it possible to obtain a closing force which is actually smaller in the open position than in the closed posi-tion of the valve.
Two embodiments of the invention are illustrated in the attached drawings, wherein:
Figure 1 is a cross-section through a non-return valve according to the invention having a closing part in the closed position;
Figure 2 shows the non-return valve according to Figure 1 in the open position;
Figure 3 is a detail of the closing part of the non-return valve according to Figure l;
Figure 4 shows a non-return valve according to the invention having two closure parts, as seen from the inlet side and in part cross-section;
Figure 5 is a section through the non-return valve in Figure 4 along the line 5 - 5;
Figure 6 is a detail of the non-return valve according to Figure 4, as seen from the outlet side.
In the embodiment according to Figures 1 to 3, valve housing 1 has as internal chamber 2 on the inlet side and an internal chamber 3 on the outlet side. A closure part 4 is mounted pivotably upon an axis 5 located in internal :
chamber 3, the said closure part co-operating with a valve seat 6 (see Figure
The invention relates to a non-return valve, having a valve housing, a valve seat, at least one closing part co-operating with the latter ant mounted pivotably in said housing, and at least one closing spring held stationarily therein ant comprising at least one pivotable operating arm engaging with the closing part, in known non-return valves of this kind, the closing spring is in the form of a torsion spring, the coils of which are mounted upon the pivot axis of the closing part or parts, the ends of the said coils extending at right angles to the axi~ thereof and forming two legs, one or both of which engage with the said closing part or parts. -The said spring thus exerts upon the said closing part or parts a closing torque which increases with the opening angle. If the non-return valve ;
^ is to be fully opened, therefore, the load applied by the flow must be relatively high and the flow volume must be large, but this is not always the case under varying operating conditions. Non-return valves of this -kind therefore operate at certain times in partly open positions, and this is apt to cause chatter and flow noises. Flow losses are also relatively large.
It is the purpose of the invention to provide a non-return valve of the kind mentioned in the opening paragraph hereof in which the closing spring exerts upon the closing part or parts a force which either increases only slightly with the opening angle, or even decreases therewith, so that a fully open non-return valve is possible even when the flow volume is relatively small.
According to the invention there is provided a non-return valve having a valve housing and a valve seat, at least one closing part co-operating with the latter and mounted pivotably in the said housing, and at least one closing spring held stationarily therein and comprising at least one pivotable operating arm engaging with the said closing part, ~ characterized in that the closing spring is arranged in the inlet side ; 30 of the internal chamber of the valve housing; and in that a connecting means is provided which connects the operating arm to the closing part to ; bias the closing part towards the valve seat, said connecting means ., ~ A
``` 10`78'7'0~ , ~
.; ~
comprising a slite connection that permits the point of engagement between the closing part and the operating arm to move towards and : `~
away from the pivot of one of the operating arms ant the closing part, during pivotal movement of the closing part.
This arrangement of the closing spring displaces the pivot axis of the operating arm of the closing spring on the inlet side in front of the :
`:
., ' '`' '.:
:
~:
-.~: :
-; ,:
:: :
:
~i~
. :
. i ., .
.~
,.
.
: - la -` 1J~787(~
pivot axis of the closing part. During the opening procedure~ this either ~ .
lengthens the effective lever arm on the spring side or shortens it on the closing-part side, the said lever arm applying to the said closing part the ~ ~;
load produced by the closing spring. This change in the length of the lever arm is superimposed over the unavoidable increase in the torque applied by the closing spring as the valve opens, thus making it possible to obtain a closing force which is actually smaller in the open position than in the closed posi-tion of the valve.
Two embodiments of the invention are illustrated in the attached drawings, wherein:
Figure 1 is a cross-section through a non-return valve according to the invention having a closing part in the closed position;
Figure 2 shows the non-return valve according to Figure 1 in the open position;
Figure 3 is a detail of the closing part of the non-return valve according to Figure l;
Figure 4 shows a non-return valve according to the invention having two closure parts, as seen from the inlet side and in part cross-section;
Figure 5 is a section through the non-return valve in Figure 4 along the line 5 - 5;
Figure 6 is a detail of the non-return valve according to Figure 4, as seen from the outlet side.
In the embodiment according to Figures 1 to 3, valve housing 1 has as internal chamber 2 on the inlet side and an internal chamber 3 on the outlet side. A closure part 4 is mounted pivotably upon an axis 5 located in internal :
chamber 3, the said closure part co-operating with a valve seat 6 (see Figure
2).
Arranged in internal chamber 2 in the inlet side of valve housing 1 ` is a closing spring in the form of a torsion spring 7, the said spring having coils 8, the ends of which extend to form two spring legs 9, 10 running at "
. .
~ - 2 -, . ., ,, , , . -i~7~4 : :, right angles to the axis of the spring coils. The short leg 9 bears against valve housing 1, whereas the long leg 10 constitutes an operating arm engag- -ing with closing part 4. To this end, the inlet face of the said closing part is provided with a groove 11 which runs at right angles to pivot axis ;- 5 and has lateral undercuts 12, in which the free end of spring leg 10 is engaged by means of lateral sliding arms 13 arranged at the free end there-of. :
Torsion spring 7 is accommodated in a pocket-like recess 14 in the wall of internal chamber 2, coils 8 of the said spring being thus recessed in relation to the medium flowing through the non-return valve. The said coils are mounted upon a removable pin 15 which is secured in the valve housing parallel with pivot axis 5.
Since torsion spring 7 is located in the inlet side, its closing action is applied to closing part 4 in tension.
As may be gathered from Figures 1 and 2, the point of engagement of ;~
torsion spring 10 with closing part 4, during the opening of the valve, moves continuously towards pivot axis 5, since the pivot axis of spring leg 10 is ; displaced towards the inlet side in relation to the said pivot axis, the said pivot axis of spring leg 10 coinciding with pin 15. The effective lever arm ~;
~;20 16, defined by the point at which the spring engages with the closing part, therefore decreases accordingly. This effect is superimposed over the in-,.~
` crease in the closing force at end 13 of spring leg 10 occurring concurrently with the opening of the valve. In spite of this increase in force, a reduc-, .~ .
tion is thus obtained in the closing force applied to closing part 4 by the spring while the valve is opening.
,, The non-return valve illustrated in Figures 4 to 6 has two closing "j ;~ parts 17, 18 arranged side by side and having adjacent pivot pins 19, 20 mounted in clips 21 in valve housing 1. Housing 1 is also provided with a transverse web 22 acting as a valve seat for the adjacent edge areas of clos-ing parts 17, 18. Associated with each of the latter, on the inlet side, are , _ 3 _ , :
two torsion springs 23, 24, coils 25 of which are mounted on pins 27 located in lateral recesses 26 on each side of transverse web 22. These pins are in the form of cantilever studs secured to the valve housing by one end. Finally, the inlet-side surfaces of closing parts 17, 18 have eyes 28 through which the long legs 29 of torsion springs 23, 24 move axially, whereas the short legs 30 bear against transverse web 22.
In this design, eyes 28, and thus the points of engagement, on the closing part side, of torsion springs 23, 24, slide on spring legs 29 and move, while the valve is opening, towards the free ends of the said legs.
Thus the increasing torque applied by torsion springs 23, 24, while the valve is opening, is transferred therefrom by a constantly lengthening effective lever arm 31. This compensates for, or exceeds, the increase in the torque applied by the said torsion springs, and this signifies a decrease in the closing force applied to closing parts 17, 18 while the valve is opening.
The arrangement of torsion springs 23, 24 on the inlet side makes it possible to locate the pivot axis of the closing parts in the immediate vicini-ty of valve seat 6, and there is no longer any need for room for the springs between the pivot axis and the valve seat. The freedom of movement required for adequate opening of closing parts 17, 18 is provided by a separate pivot . .
-; 20 axis or pin l9, 20 for each closing part 17, 18. This arrangement of the axes ~ close to the valve seat makes it possible to reduce the length of the housing ,; ~
. on the outlet side, thus making it possible to use a longer transverse web 22.
-~ The advantage of this is greater rigidity which allows a housing of short ;~ structural length to withstand heavy operating loads. Since they are located in the neùtral-load zone of transverse web 22, recesses 26 provided for tor-,::
sion springs 23, 24 in the said transverse web, do not affect the rigidity ,~ thereof.
~ In the pivot axis of the closing is arranged at a distance from the , .~
valve seat, as is the case with known mountings of the torsion springs on this pivot axis, the outer edges, remote from the axis, of the two closing parts ''',:
:, .":
~ - 4 -~' move, while the valve is opening, on an arc of a circle which initially runs radially outwards and only later runs radially inwards.
This outwardly-directed component of movement makes it necessary to provide correspondingly smaller closing partsJ as compared with the inside ; diameter of the closing bearing, on the outlet side, against the valve housing (for instance a pipeline flange) in order to ensure access to the closing parts.
The location of pivot pins 19, 20 of closing parts 17, 18 close to the valve seat, as in the embodiment shown in Figures 4 to 6, causes the outer edges of the said closing parts to describe, as the valve opens, an arc 32 which is directed radially inwards right from the start. This makes it possi-ble to use particularly large closing parts 17, 18, the freedom of which to pivot is not obstructed by connecting part 33 on the outlet side. This advan-tage is particularly significant in the case of non-return valves of large widths.
, :~ :
. ^ .
,, ~, ':`
Arranged in internal chamber 2 in the inlet side of valve housing 1 ` is a closing spring in the form of a torsion spring 7, the said spring having coils 8, the ends of which extend to form two spring legs 9, 10 running at "
. .
~ - 2 -, . ., ,, , , . -i~7~4 : :, right angles to the axis of the spring coils. The short leg 9 bears against valve housing 1, whereas the long leg 10 constitutes an operating arm engag- -ing with closing part 4. To this end, the inlet face of the said closing part is provided with a groove 11 which runs at right angles to pivot axis ;- 5 and has lateral undercuts 12, in which the free end of spring leg 10 is engaged by means of lateral sliding arms 13 arranged at the free end there-of. :
Torsion spring 7 is accommodated in a pocket-like recess 14 in the wall of internal chamber 2, coils 8 of the said spring being thus recessed in relation to the medium flowing through the non-return valve. The said coils are mounted upon a removable pin 15 which is secured in the valve housing parallel with pivot axis 5.
Since torsion spring 7 is located in the inlet side, its closing action is applied to closing part 4 in tension.
As may be gathered from Figures 1 and 2, the point of engagement of ;~
torsion spring 10 with closing part 4, during the opening of the valve, moves continuously towards pivot axis 5, since the pivot axis of spring leg 10 is ; displaced towards the inlet side in relation to the said pivot axis, the said pivot axis of spring leg 10 coinciding with pin 15. The effective lever arm ~;
~;20 16, defined by the point at which the spring engages with the closing part, therefore decreases accordingly. This effect is superimposed over the in-,.~
` crease in the closing force at end 13 of spring leg 10 occurring concurrently with the opening of the valve. In spite of this increase in force, a reduc-, .~ .
tion is thus obtained in the closing force applied to closing part 4 by the spring while the valve is opening.
,, The non-return valve illustrated in Figures 4 to 6 has two closing "j ;~ parts 17, 18 arranged side by side and having adjacent pivot pins 19, 20 mounted in clips 21 in valve housing 1. Housing 1 is also provided with a transverse web 22 acting as a valve seat for the adjacent edge areas of clos-ing parts 17, 18. Associated with each of the latter, on the inlet side, are , _ 3 _ , :
two torsion springs 23, 24, coils 25 of which are mounted on pins 27 located in lateral recesses 26 on each side of transverse web 22. These pins are in the form of cantilever studs secured to the valve housing by one end. Finally, the inlet-side surfaces of closing parts 17, 18 have eyes 28 through which the long legs 29 of torsion springs 23, 24 move axially, whereas the short legs 30 bear against transverse web 22.
In this design, eyes 28, and thus the points of engagement, on the closing part side, of torsion springs 23, 24, slide on spring legs 29 and move, while the valve is opening, towards the free ends of the said legs.
Thus the increasing torque applied by torsion springs 23, 24, while the valve is opening, is transferred therefrom by a constantly lengthening effective lever arm 31. This compensates for, or exceeds, the increase in the torque applied by the said torsion springs, and this signifies a decrease in the closing force applied to closing parts 17, 18 while the valve is opening.
The arrangement of torsion springs 23, 24 on the inlet side makes it possible to locate the pivot axis of the closing parts in the immediate vicini-ty of valve seat 6, and there is no longer any need for room for the springs between the pivot axis and the valve seat. The freedom of movement required for adequate opening of closing parts 17, 18 is provided by a separate pivot . .
-; 20 axis or pin l9, 20 for each closing part 17, 18. This arrangement of the axes ~ close to the valve seat makes it possible to reduce the length of the housing ,; ~
. on the outlet side, thus making it possible to use a longer transverse web 22.
-~ The advantage of this is greater rigidity which allows a housing of short ;~ structural length to withstand heavy operating loads. Since they are located in the neùtral-load zone of transverse web 22, recesses 26 provided for tor-,::
sion springs 23, 24 in the said transverse web, do not affect the rigidity ,~ thereof.
~ In the pivot axis of the closing is arranged at a distance from the , .~
valve seat, as is the case with known mountings of the torsion springs on this pivot axis, the outer edges, remote from the axis, of the two closing parts ''',:
:, .":
~ - 4 -~' move, while the valve is opening, on an arc of a circle which initially runs radially outwards and only later runs radially inwards.
This outwardly-directed component of movement makes it necessary to provide correspondingly smaller closing partsJ as compared with the inside ; diameter of the closing bearing, on the outlet side, against the valve housing (for instance a pipeline flange) in order to ensure access to the closing parts.
The location of pivot pins 19, 20 of closing parts 17, 18 close to the valve seat, as in the embodiment shown in Figures 4 to 6, causes the outer edges of the said closing parts to describe, as the valve opens, an arc 32 which is directed radially inwards right from the start. This makes it possi-ble to use particularly large closing parts 17, 18, the freedom of which to pivot is not obstructed by connecting part 33 on the outlet side. This advan-tage is particularly significant in the case of non-return valves of large widths.
, :~ :
. ^ .
,, ~, ':`
Claims (7)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A non-return valve having a valve housing and a valve seat, at least one closing part co-operating with the latter and mounted pivotably in the said housing, and at least one closing spring held stationarily therein and comprising at least one pivotable operating arm engaging with the said closing part, characterized in that the closing spring is arranged in the inlet side of the internal chamber of the valve housing; and in that a connecting means is provided which connects the operating arm to the closing part to bias the closing part towards the valve seat, said connecting means comprising a slide connection that permits the point of engagement between the closing part and the operating arm to move towards and away from the pivot of one of the operating arms and the closing part, during pivotal movement of the closing part.
2. A non-return valve as defined in claim 1, characterized in that the connecting means is in the form of an eye located on an inlet face of the closing part, the operating arm of the closing spring passing through the said eye and moving axially thereof.
3. A non-return valve as defined in claim 1, characterized in that the connecting means is on an inlet face of the closing part and is in the form of a groove running at right angles to the pivot axis of the said closing part and provided with lateral undercuts, the free end of the operative arm being fitted with lateral arms engaging in the said undercuts.
4. A non-return valve as defined in claim 1, characterized in that the closing spring is in the form of a torsion spring, one leg of which constitutes the operating arm, a supporting pin is arranged in the valve housing parallel with the pivot axis of the closing part, the coils of the said torsion spring being mounted upon the said supporting pin.
5. A non-return valve as defined in claim 4, characterized in that the supporting pin is in the form of a cantilever held by one end in the valve housing.
6. A non-return valve as defined in claim 1, or 2, or 3, characterized in that two closing parts are mounted pivotably side by side in the valve housing by their edge areas facing each other, the said closing parts being provided with separate closing springs, the pivot axes of the respective operating arms being spaced radially from each other.
7. A non-return valve as defined in claim 1, or 2, or 3, characterized in that an internal chamber on the inlet side of the valve housing has at least one lateral, pocket-like, recess in which a closing spring is arranged.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE2718821A DE2718821C2 (en) | 1977-04-28 | 1977-04-28 | Check valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1078704A true CA1078704A (en) | 1980-06-03 |
Family
ID=6007444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA301,116A Expired CA1078704A (en) | 1977-04-28 | 1978-04-14 | Non-return valve |
Country Status (9)
| Country | Link |
|---|---|
| AU (1) | AU513481B2 (en) |
| BR (1) | BR7802423A (en) |
| CA (1) | CA1078704A (en) |
| DE (1) | DE2718821C2 (en) |
| ES (1) | ES467876A1 (en) |
| FR (1) | FR2389057A1 (en) |
| GB (1) | GB1563487A (en) |
| IT (1) | IT1102064B (en) |
| SE (1) | SE7804849L (en) |
Families Citing this family (13)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7929136U1 (en) * | 1979-10-13 | 1980-07-03 | Gustav F. Gerdts Kg, 2800 Bremen | RETURN VALVE |
| DE3113938A1 (en) * | 1981-04-07 | 1982-10-28 | Gustav F. Gerdts GmbH & Co KG, 2800 Bremen | RETURN VALVE |
| FR2555971B1 (en) * | 1983-12-02 | 1986-10-03 | Sereg Soc | CONTAINER SHUTTER FOR CONTAINING POWDER |
| ITTV940009U1 (en) * | 1994-03-04 | 1995-09-04 | Jacuzzi Europ | VALVE DEVICE FOR JETS FOR WHIRLPOOL BATHS |
| AU769167B2 (en) * | 1999-01-13 | 2004-01-15 | Baker Hugues Incorporated | Torsion spring connections for a downhole flapper |
| US6957703B2 (en) | 2001-11-30 | 2005-10-25 | Baker Hughes Incorporated | Closure mechanism with integrated actuator for subsurface valves |
| US6877564B2 (en) | 2002-09-30 | 2005-04-12 | Baker Hughes Incorporated | Flapper closure mechanism |
| EP2017510B1 (en) | 2007-06-12 | 2011-03-23 | Arno Hofmann | Gas fed revolving flap valve |
| EP3037673B1 (en) * | 2014-12-22 | 2019-09-11 | Whirlpool EMEA S.p.A | Suction device for a hood |
| EP4092205A1 (en) * | 2018-10-02 | 2022-11-23 | vonRoll infratec (investment) ag | Back flow preventer |
| EP3667138B1 (en) * | 2018-12-10 | 2022-11-23 | Hamilton Sundstrand Corporation | Check valve |
| CN110775466A (en) * | 2019-11-06 | 2020-02-11 | 湖南新威凌金属新材料科技股份有限公司 | Flap valve device for discharging powder materials |
| DE102020204436A1 (en) | 2020-04-06 | 2021-10-07 | Elringklinger Ag | Valve device and electrochemical system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB870868A (en) * | 1958-10-13 | 1961-06-21 | Rotax Ltd | Non-return valves |
-
1977
- 1977-04-28 DE DE2718821A patent/DE2718821C2/en not_active Expired
-
1978
- 1978-02-28 GB GB7802/78A patent/GB1563487A/en not_active Expired
- 1978-03-15 ES ES467876A patent/ES467876A1/en not_active Expired
- 1978-03-21 FR FR7808163A patent/FR2389057A1/en not_active Withdrawn
- 1978-04-06 AU AU34851/78A patent/AU513481B2/en not_active Expired
- 1978-04-14 CA CA301,116A patent/CA1078704A/en not_active Expired
- 1978-04-19 BR BR7802423A patent/BR7802423A/en unknown
- 1978-04-27 IT IT49112/78A patent/IT1102064B/en active
- 1978-04-27 SE SE7804849A patent/SE7804849L/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| AU513481B2 (en) | 1980-12-04 |
| IT7849112A0 (en) | 1978-04-27 |
| AU3485178A (en) | 1979-10-11 |
| FR2389057A1 (en) | 1978-11-24 |
| ES467876A1 (en) | 1978-11-01 |
| SE7804849L (en) | 1978-10-29 |
| DE2718821C2 (en) | 1979-02-22 |
| DE2718821B1 (en) | 1978-06-22 |
| GB1563487A (en) | 1980-03-26 |
| BR7802423A (en) | 1978-11-14 |
| IT1102064B (en) | 1985-10-07 |
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| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |