GB1563487A - Non-return flap valve - Google Patents
Non-return flap valve Download PDFInfo
- Publication number
- GB1563487A GB1563487A GB7802/78A GB780278A GB1563487A GB 1563487 A GB1563487 A GB 1563487A GB 7802/78 A GB7802/78 A GB 7802/78A GB 780278 A GB780278 A GB 780278A GB 1563487 A GB1563487 A GB 1563487A
- Authority
- GB
- United Kingdom
- Prior art keywords
- valve
- closure member
- springs
- closure
- closing
- 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
- 230000015572 biosynthetic process Effects 0.000 claims description 8
- 230000007423 decrease Effects 0.000 claims description 5
- 238000010276 construction Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 238000011068 loading method Methods 0.000 claims description 4
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000013459 approach Methods 0.000 claims description 2
- 230000001627 detrimental effect Effects 0.000 claims description 2
- 238000005755 formation reaction Methods 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- 230000004308 accommodation Effects 0.000 description 1
- 244000145845 chattering Species 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
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)
Description
(54) A NON-RETURN FLAP VALVE
(71) We, GUSTAV F. GERDTS KG, of
Hemmstrasse 130, D-2800 Bremen 1,
Federal Republic of Germany, a German
Company, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement:: This invention relates to a non-return flap valve of the kind (herein called "the kind defined") comprising a housing forming an inflow chamber and an outflow chamber and a valve seat, at least one closure member in the form of a flap pivotably mounted in the housing for co-operation with the valve seat to close the valve, the or each closure member being accommodated in the outflow chamber when the valve is closed, and the or each closure member being loaded by a respective closing spring having coils located non-displaceably in the valve housing and at least one operating arm which exerts spring force tending to move the respective closure member into the closed position against the valve seat.
In some known non-return flap valves of the kind defined (for example German Publication Specification 2426084 and German
Patent Specification 11 53 955) the closing spring is formed as an operating lever spring with helical coils which are mounted on the pivot spindle of the closure member or members, while two spring arms extend transversely of the axis of the coils. One or each of these spring arms acts upon the respective closure member or members. The closing spring here exerts upon the closure member or members a net closing force which increases as the angle of opening increases. Accordingly a relatively great flow force and thus a high quantity of throughput are necessary for full opening of these non-return flap valves, but such great flow force and throughput do not always occur.
for example in cases of changing operational conditions. Therefore such non-return flap valves at times operate in partially open positions, whereby chattering and flow noises can occur, and moreover the resistance to flow and consequent energy losses are relatively great.
The invention is therefol e intended to facilitate the provision of a non-return flap valve of the kind defined in which the or each closing spring exerts upon the respective closure member a net closing action force which increases only slightly, or preferably even decreases, as the angle of opening increases, so that full opening of the non-return flap valve may occur even with relatively small throughput flow quantities.
According to the invention a valve of the kind defined is characterised in that the or each closing spring is arranged in the inflow chamber on the inflow side of the valve housing, and in that on the operating arm of the or each closing spring and/or on the or each closure member there is provided an engaging formation which effects a coupling of the said operating arm to the respective closure member for drawing the respective closure member in the closing direction of pivoting so that relative motion takes place between the operating arm and the closure member during movement of the closure member.
Due to the arrangement of the valve in accordance with the invention the pivot axis of the operating arm of the closing spring is placed at the inflow side upstream of the closure member pivot axis. This has as a consequence that during the opening operation there is an elongation of the effective lever arm or distance between arm axis and arm action point through which the closing force upon the closure member is effected by the closer spring. The variation of the said lever arm or distance is superimposed upon and tends to counteract the increase of torque of the closing spring due to winding up of the coils during the opening operation, and thus it is possible for the closing force exerted by the closing spring upon the closure member to be less in the fully open position than in the closed position.
In one valve embodying the invention the engaging formation is formed as an eye provided on the inflow-side face of the closure member, and through this eye the operating arm of the closing spring extends in an axially movable manner.
In another valve embodying the invention the engaging formation is a slide groove extending transversely of the closure member pivot axis and having lateral undercuttings and provided on the inflow-side face of the closure part, and the operating arm carries on its free end a cross-piece of which the ends engage in the undercuttings.
The last-mentioned two valves contain two preferred constructionally simple and functionally favourable engaging formations between the respective closure members and the operating arms of the closing springs.
For all those cases where the closing spring is formed as an "operating lever" or two-armed spring, there may be a favourable non-displaceable mounting of the closing spring in the valve housing if a mounting bolt is arranged in the valve housing parallel to the closure member pivot axis, and on this bolt are mounted the coils of the closing spring.
If the mounting bolt is formed as a cantilever journal held by one of its ends in the valve housing there is a configuration which is favourable to manufacture.
In a preferred form of valve having two closure members articulated at their adjacent edges, separate closing springs are allocated to the two closure members, and the pivot axes of the operating arms of the springs are radially spaced from one another. A constantly adequate freedom of movement of the operating arm of each closing spring is in this case especially simply and reliably achievable.
Preferably the valve housing comprises in its inflow chamber one or more lateral socket-like recesses in which the coils of the closing spring or springs is or are arranged.
This offers the advantage of an arrangement of the closing spring largely countersunk away from the flow of medium, which is conducive to the achievement of a low flow resistance and the avoidance of flow noises.
Two examples of embodiment of the invention are illustrated in the drawing, where in:- Figure 1 shows a non-return flap valve according to the invention with one closure part, in the closed position, in section,
Figure 2 shows the non-return flap valve according to Figure 1 in the open position,
Figure 3 shows the closure part of the non-return flap valve according to Figure 1,
as detail,
Figure 4 shows a non-return flap valve according to the invention with two closure parts, in a view from the inflow side with partial sectional illustration,
Figure 5 shows the non-return flap valve
according to Figure 4 in section- along the line 5-5, and
Figure 6 shows the non-return flap valve according to Figure 4 in a view from the outflow side, as detail.
The valve shown in Figures 1 to 3 has a valve housing 1 with an inflow chamber 2 and an outflow chamber 3 on the outflow side. A closure member 4 which is pivotably mounted on a pivot spindle 5 in the outflow chamber 3 co-operates with a valve seat 6.
In the inflow chamber 2 is a closing spring in the form of a so-called "operating lever" or two-armed spring 7 having coils 8 integrally interconnecting two spring arms 9 and 10 which extend transversely of the axis of the coils 8. The arm 9 is shorter than the arm 10 and bears on the valve housing 1, while the longer arm 10 acts as an operating arm on the closure member 4. For this purpose the closure member 4 has in its inflow-side face an elongated slide groove 11 extending transversely of the pivot spindle 5, with lateral undercuttings 12. The spring arm 10 has at its end remote from the coils 8 a cross-piece 13 which engages longitudinally displaceably in the undercuttings 12, the latter extending the full length of the groove 11.
For the accommodation of the coils 8 of the spring 7 the boundary of the inflow chamber 2 is formed with a lateral socketlike recess 14. The spring coils 8 are arranged in this recess 14 substantially out of the flow of medium flowing through the valve. The coils 8 are mounted on a mounting bolt 15 which is secured in the valve housing 1 and is parallel to the pivot spindle 5.
As the spring 7 is arranged on the inflow side of the valve its closing action is to draw the closure member 4 towards the valve seat 6.
As may be seen from Figures 1 and 2, the point of action of the spring arm 10 upon the closure member 4 shifts constantly in the direction towards the pivot spindle 5 during the opening movement of the member 4. This results from the arrangement of the pivot axis of the spring arm 10, which substantially coincides with the axis of the mounting bolt 15 and thus is offset towards the inflow side of the valve in relation to the pivot spindle 5. Between the pivot axis of the closure member 4 and the point at which the arm 10 of the spring 7 acts on the closure member 4 is a distance 16 which decreases accordingly as the valve opens.
This action is superimposed upon the in
crease of the force exerted in the closing direction on the closure member 4 at the cross-piece 13 of the spring arm 10 during the opening operation. Despite this increase of force, the net effect due to the decrease of the distance 16 is a reduction of the net: closing action torque exerted by the spring 7 upon the closure member 4.
The non-return flap valve as shown in
Figures 4 to 6 comprises two closure members 17 and 18 placed side-by-side and provided with adjacent lateral pivot journals 19 and 20 mounted in clips 21 in the valve housing 1. The latter is provided with a cross-bar 22 which forms parts of valve seats to co-operate with the mutually adjacent marginal zones of the two closure members 17 and 18. Each of the two closure members 17 and 18 is acted upon by two respective two-armed closing springs 23 and 24 on the inflow side. The springs 23 and 24 have coils 25 which are mounted on mounting bolts 27 in lateral recesses 26 present on both sides on the cross-bar 22.
The mounting bolts 27 are in the form of cantilever journals each held at one end in the valve housing 1. On their inflow side faces the closure members 17 and 18 have eyes 28 through which the longer spring arms 29 of the springs 23 and 24 extend in axially movable manner. The shorter arms
30 of the springs 23 and 24 bear on the cross-bar 22.
In the valve of Figures 4 to 6 the eyes 28, and thus the points at which the longer spring arms 29 act on the closure members 17 and 18, slide along the spring arms 29 and shift towards the free ends of the arms 29 during the opening of the valve owing to the pivoting movements of the closure members 17 and 18. Thus although the torque of the springs 23 and 24 rises during the opening of the valve, this spring torque is transmitted through a constantly increasing distance 31 between the axis of the mounting bolt 27 and the points at which the respective springs 23 or 24 act upon each closure member 17 or 18.The said torque does not increase as quickly as the said distance, and so the closing forces exerted by the springs 23 and 24 upon the closure members 17 and 18 decrease during opening, that is to say there is a reduction of the closing action exerted by the springs upon the closure members 17 and 18 during opening.
The arrangement of the springs 23 and 24 on the inflow side produces the possibility of arranging the closure member pivot axes in the immediate vicinity of the valve seat 6, since no free space of any kind is neces sary for springs between these pivot axes and the valve seat 6. The freedom of movement of the closure members 17 and 18 necessary for a sufficiently wide opening is achieved by providing a separate pivot axis or journal 19 or 20 for each closure member 17 or 18. The arrangement of the axes or journals close to the valve seat requires little housing construction length on the exit side, so that a larger proportion of overall housing length can be devoted to the dimensioning of the cross-bar 22. The advantages are high rigidity, and thus usability for high working loadings, with small overall housing construction length.The recesses 26 provided in the cross-bar 22 for the coils 25 of the springs 23 and 24 are not unduly detrimental to the rigidity of the cross-bar 22 because of their positions in a zone of the cross-bar 22 which is not greatly stressed as regards flexural loading.
In the case of a closure member pivot axis arranged with substantial spacing from the valve seat, as is the case in the conventional mounting of the two-armed closing springs with coils on this pivot axis, the outer edge section of the or each closure member re mote from the axis moves, during opening in each case, on an arc which is initially directed radially outwards and leads radially inwards only later as the opening movement approaches completion.
This initially outwardly directed movement component compels the use of correspondingly smaller closure members in comparison with the internal diameter of the connection part adjoining the valve housing on the outflow side, for example a pipe flange, in order to guarantee freedom of movement of the or each closure member.
Due to the placing of the pivot journals 19 and 20 of the two closure members 17 and 18 close to the valve seat 6 in the valve according to Figures 4 to 6, the outer edges of the members 17 and 18 during opening describe each an arc 32 which is directed radially inwards from the commencement of the opening movement. This permits relatively large closure members 17 and 18 to be used without detriment to their freedom of pivoting due to interference with the pipe or other connection part 33 on the outflow side. This advantage is of particular importance in the case of non-return flap valves of great rated widths.
WHAT WE CLAIM IS:- 1. A non-return flap valve of the kind defined, characterised in that the or each closing spring (7; 23, 24) is arranged in the inflow chamber (2) on the inflow side of the valve housing (1), and in that on the operating arm (10; 29) of the or each closing spring (7; 23, 24) and/or on the or each closure member (4; 17, 18) there is provided an engaging formation (11-13; 28) which effects a coupling of the said operating arm (10; 29) to the respective closure member (4; 17, 18) for drawing the respective closure member (4; 17, 18) in the closing direction of pivoting so that relative motion takes place between the operating arm (10; 29) and the closure member (4, 17, 18) during movement of the closure member 4, 17, 18,
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (8)
- **WARNING** start of CLMS field may overlap end of DESC **.closing action torque exerted by the spring 7 upon the closure member 4.The non-return flap valve as shown in Figures 4 to 6 comprises two closure members 17 and 18 placed side-by-side and provided with adjacent lateral pivot journals 19 and 20 mounted in clips 21 in the valve housing 1. The latter is provided with a cross-bar 22 which forms parts of valve seats to co-operate with the mutually adjacent marginal zones of the two closure members 17 and 18. Each of the two closure members 17 and 18 is acted upon by two respective two-armed closing springs 23 and 24 on the inflow side. The springs 23 and 24 have coils 25 which are mounted on mounting bolts 27 in lateral recesses 26 present on both sides on the cross-bar 22.The mounting bolts 27 are in the form of cantilever journals each held at one end in the valve housing 1. On their inflow side faces the closure members 17 and 18 have eyes 28 through which the longer spring arms 29 of the springs 23 and 24 extend in axially movable manner. The shorter arms30 of the springs 23 and 24 bear on the cross-bar 22.In the valve of Figures 4 to 6 the eyes 28, and thus the points at which the longer spring arms 29 act on the closure members 17 and 18, slide along the spring arms 29 and shift towards the free ends of the arms 29 during the opening of the valve owing to the pivoting movements of the closure members 17 and 18. Thus although the torque of the springs 23 and 24 rises during the opening of the valve, this spring torque is transmitted through a constantly increasing distance 31 between the axis of the mounting bolt 27 and the points at which the respective springs 23 or 24 act upon each closure member 17 or 18.The said torque does not increase as quickly as the said distance, and so the closing forces exerted by the springs 23 and 24 upon the closure members 17 and 18 decrease during opening, that is to say there is a reduction of the closing action exerted by the springs upon the closure members 17 and 18 during opening.The arrangement of the springs 23 and 24 on the inflow side produces the possibility of arranging the closure member pivot axes in the immediate vicinity of the valve seat 6, since no free space of any kind is neces sary for springs between these pivot axes and the valve seat 6. The freedom of movement of the closure members 17 and 18 necessary for a sufficiently wide opening is achieved by providing a separate pivot axis or journal 19 or 20 for each closure member 17 or 18. The arrangement of the axes or journals close to the valve seat requires little housing construction length on the exit side, so that a larger proportion of overall housing length can be devoted to the dimensioning of the cross-bar 22. The advantages are high rigidity, and thus usability for high working loadings, with small overall housing construction length.The recesses 26 provided in the cross-bar 22 for the coils 25 of the springs 23 and 24 are not unduly detrimental to the rigidity of the cross-bar 22 because of their positions in a zone of the cross-bar 22 which is not greatly stressed as regards flexural loading.In the case of a closure member pivot axis arranged with substantial spacing from the valve seat, as is the case in the conventional mounting of the two-armed closing springs with coils on this pivot axis, the outer edge section of the or each closure member re mote from the axis moves, during opening in each case, on an arc which is initially directed radially outwards and leads radially inwards only later as the opening movement approaches completion.This initially outwardly directed movement component compels the use of correspondingly smaller closure members in comparison with the internal diameter of the connection part adjoining the valve housing on the outflow side, for example a pipe flange, in order to guarantee freedom of movement of the or each closure member.Due to the placing of the pivot journals 19 and 20 of the two closure members 17 and 18 close to the valve seat 6 in the valve according to Figures 4 to 6, the outer edges of the members 17 and 18 during opening describe each an arc 32 which is directed radially inwards from the commencement of the opening movement. This permits relatively large closure members 17 and 18 to be used without detriment to their freedom of pivoting due to interference with the pipe or other connection part 33 on the outflow side. This advantage is of particular importance in the case of non-return flap valves of great rated widths.WHAT WE CLAIM IS:- 1. A non-return flap valve of the kind defined, characterised in that the or each closing spring (7; 23, 24) is arranged in the inflow chamber (2) on the inflow side of the valve housing (1), and in that on the operating arm (10; 29) of the or each closing spring (7; 23, 24) and/or on the or each closure member (4; 17, 18) there is provided an engaging formation (11-13; 28) which effects a coupling of the said operating arm (10; 29) to the respective closure member (4; 17, 18) for drawing the respective closure member (4; 17, 18) in the closing direction of pivoting so that relative motion takes place between the operating arm (10; 29) and the closure member (4, 17, 18) during movement of the closure member 4, 17, 18,
- 2. A valve according to claim 1, wherein the engaging formation is formed as an eye (28) provided on the inflow-side face of the closure member (17, 18), and through this eye (28) the operating arm (29) of the closing spring (23, 24) extends in an axially movable manner.
- 3. A valve according to claim 1, wherein the engaging formation is a slide groove (11) extending transversely of the closure member (4) pivot axis (5) and having lateral undercuttings (12) and provided on the inflow side face of the closure member (4), and the operating arm (10) carries on its free end a cross-piece (13) of which the ends engage in the undercuttings (12).
- 4. A valve according to one or more of claims 1, 2, or 3, wherein a mounting bolt (15; 27) is arranged in the valve housing (1) parallel to the closure member pivot axis (5; 19, 20), and on this bolt (15; 27) are mounted the coils (8; 25) of the closing spring (7; 23, 24).
- 5. A valve according to claim 4, where dn the mounting bolt (27) is formed as a cantilever journal held by one of its ends in the valve housing (1)
- 6. A valve according to any one of the preceding claims, wherein where two closure members (17, 18) are placed side-byside and are mounted pivotably in the valve housing (1) on their edge zones which are adjacent to one another, separate closing springs (23, 24) are alloced to the two closure members (17, 18) and the pivot axes (27) of the operating arms of the springs (23, 24) are radially spaced from one another.
- 7. A valve according to any one of the preceding claims, wherein the valve housing (1) comprises in its inflow chamber (2) one or more lateral socket-like recesses (14; 26) in which the coils (8; 25) of the closing spring or springs (7; 23, 24) is or are arranged.
- 8. A non-return flap valve constructed and arranged substantially as hereinbefore described with reference to and as illustrated in Figures 1 to 3 or Figures 4 to 6 of the accompanying drawings.
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 |
|---|---|
| GB1563487A true GB1563487A (en) | 1980-03-26 |
Family
ID=6007444
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB7802/78A Expired GB1563487A (en) | 1977-04-28 | 1978-02-28 | Non-return flap 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) |
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3113938A1 (en) * | 1981-04-07 | 1982-10-28 | Gustav F. Gerdts GmbH & Co KG, 2800 Bremen | RETURN VALVE |
| GB2345742A (en) * | 1999-01-13 | 2000-07-19 | Baker Hughes Inc | Flapper return spring arrangement |
| WO2004031534A1 (en) | 2002-09-30 | 2004-04-15 | Baker Hughes Incorporated | Flapper valve closure mechanism |
| US6957703B2 (en) | 2001-11-30 | 2005-10-25 | Baker Hughes Incorporated | Closure mechanism with integrated actuator for subsurface valves |
| EP2017510A1 (en) | 2007-06-12 | 2009-01-21 | Arno Hofmann | Gas fed revolving flap 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 |
| US11112023B2 (en) | 2018-12-10 | 2021-09-07 | Hamilton Sundstrand Corporation | Check valve |
| US11692734B2 (en) * | 2014-12-22 | 2023-07-04 | Whirlpool Corporation | Extraction hood |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE7929136U1 (en) * | 1979-10-13 | 1980-07-03 | Gustav F. Gerdts 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 |
| PL3633111T3 (en) * | 2018-10-02 | 2025-04-28 | Vonroll Infratec (Holding) Ag | Hose coupling for a hydrant |
| DE102020204436A1 (en) | 2020-04-06 | 2021-10-07 | Elringklinger Ag | Valve device and electrochemical system |
| EP4425020A1 (en) | 2023-02-28 | 2024-09-04 | Hinni AG | Backflow preventer for installation in a flow discharge of a system for flowable media |
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
Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3113938A1 (en) * | 1981-04-07 | 1982-10-28 | Gustav F. Gerdts GmbH & Co KG, 2800 Bremen | RETURN VALVE |
| GB2345742A (en) * | 1999-01-13 | 2000-07-19 | Baker Hughes Inc | Flapper return spring arrangement |
| US6328062B1 (en) | 1999-01-13 | 2001-12-11 | Baker Hughes Incorporated | Torsion spring connections for downhole flapper |
| GB2345742B (en) * | 1999-01-13 | 2003-08-27 | Baker Hughes Inc | 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 |
| WO2004031534A1 (en) | 2002-09-30 | 2004-04-15 | Baker Hughes Incorporated | Flapper valve closure mechanism |
| US6877564B2 (en) | 2002-09-30 | 2005-04-12 | Baker Hughes Incorporated | Flapper closure mechanism |
| EP2017510A1 (en) | 2007-06-12 | 2009-01-21 | Arno Hofmann | Gas fed revolving flap valve |
| US11692734B2 (en) * | 2014-12-22 | 2023-07-04 | Whirlpool Corporation | Extraction hood |
| US11112023B2 (en) | 2018-12-10 | 2021-09-07 | 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 |
Also Published As
| Publication number | Publication date |
|---|---|
| CA1078704A (en) | 1980-06-03 |
| AU3485178A (en) | 1979-10-11 |
| BR7802423A (en) | 1978-11-14 |
| AU513481B2 (en) | 1980-12-04 |
| SE7804849L (en) | 1978-10-29 |
| DE2718821C2 (en) | 1979-02-22 |
| DE2718821B1 (en) | 1978-06-22 |
| IT1102064B (en) | 1985-10-07 |
| IT7849112A0 (en) | 1978-04-27 |
| ES467876A1 (en) | 1978-11-01 |
| FR2389057A1 (en) | 1978-11-24 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |