GB2069661A - Housings for isolator valves - Google Patents
Housings for isolator valves Download PDFInfo
- Publication number
- GB2069661A GB2069661A GB8002605A GB8002605A GB2069661A GB 2069661 A GB2069661 A GB 2069661A GB 8002605 A GB8002605 A GB 8002605A GB 8002605 A GB8002605 A GB 8002605A GB 2069661 A GB2069661 A GB 2069661A
- Authority
- GB
- United Kingdom
- Prior art keywords
- frame
- internal
- external
- internal frame
- duct
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 4
- 239000003546 flue gas Substances 0.000 claims abstract description 4
- 238000010276 construction Methods 0.000 description 22
- 238000007789 sealing Methods 0.000 description 12
- 238000003466 welding Methods 0.000 description 7
- 239000000463 material Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000011810 insulating material Substances 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 2
- 238000009422 external insulation Methods 0.000 description 2
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
- F16K1/165—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 a plurality of closure 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
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Duct Arrangements (AREA)
- Sliding Valves (AREA)
- Flanged Joints, Insulating Joints, And Other Joints (AREA)
- Rigid Pipes And Flexible Pipes (AREA)
- Air Supply (AREA)
- Thermal Insulation (AREA)
Abstract
A housing for an isolator valve comprises an internal frame part (3) which will in use be exposed to flue gas and an external frame part (1) which will in use be exposed to the atmosphere. The internal frame may be designed either in a number of sections with provision for relative movement therebetween due to differential expansion, or as a single section which expands relative to the external frame with change in temperature. <IMAGE>
Description
SPECIFICATION
Frames for isolators
This invention relates to frames for isolators, in particular main frames for isolators or dampers (herein referred to only as isolators) for lined ducts.
In many process plants where the operating temperature 5 is of the order of 500"C or above, the gas ducting is frequently made of mild steel and internally lined with refractory concrete. This has the advantage of reducing the cost of the ducting. However, for the manufacturer of high integrity isolating equipment such ducting presents difficulties compared with the method of external insulation.
These are:
1) The ducting, being lined on the inside thereof, does not expand while the internal parts of the isolator which are subject to hot gas expands relative to the duct walls;
2) Refractory concrete material tends to break away if sharp corners are exposed;
3) Refractory concrete con not be relied upon to make a satisfactory high integrity seal when applied to closing plates.
In addition there are a number of applications where it is desirable or even necessary to install an isolator without totally cutting the duct or stack into which it is to be installed. It is only with the recent emphasis on energy conservation that these difficulties have come to light. Previously the consequences of leaking isolators were not so serious; the leaks were tolerated and the economic implications were not understood.
The present invention provides a frame for an isolator, which frame comprises an internal frame part which will in use be exposed to flue gas and an external frame part which will in use be exposed to the atmosphere.
Thus by means of the present invention the inherent incompatibilities of differential expansion of the external and internal frame parts may be accommodated.
The internal frame may be optionally designed either in a number of sections with relative movement due to differential expansion occuring between the various sections with a change in temperature, or as a single section which expands relative to the external frame with a change in temperature.
The external frame will be normally, but not necessarily, of channel-shaped cross-section and may be bolted directly into the duct or, if the duct cannot be cut, the external frame may be located outside the duct.
The invention will be further described, by way of example only, with reference to the accompanying drawings, in which:
Figure I is a side view, partly in section, showing one embodiment of a main frame of an isolator for a lined duct, in accordance with the invention;
Figure 2 is a simplified end view of the isolator frame shown in Fig. 1;
Figure 3 is a section taken along the line
A-A in Fig. 2;
Figure 4 is a view similar to Fig. 1 showing another embodiment of an isolator main frame in accordance with the invention;
Figure 5 is an end view, partly cut away, of a corner of the main frame shown in Fig. 4;
Figure 5A is a view taken in the direction of the arrow B in Fig.5;
Figures 6 and 7 are end and perspective views respectively showing an internal frame seal which may be used in the embodiment shown in Figs. 4 and 5;;
Figures 8 and 9 are views similar to Fig. 1 showing further embodiments of isolator main frames in accordance with the invention; and
Figures 10 and ii are plan views illustrating the main frame structure according to the invention as applied to guillotine isolators.
Fig. 1 shows an isolator main frame according to the invention which is suitable for application to louvre isolators which are to be fitted into new ducts or existing ducts which may be cut.
An external frame is bolted directly into a duct 2 as indicated, and an internal frame 3 is constructed in a number of parts (typically but not necessarily four) with provision made for bolting or welding the parts together on assembly. As best shown in Figs. 2 and 3, at the centre of each side of the internal frame a trunnion 4 is welded to the frame such that it may slide axially in a corresponding hole in the external frame. This ensures that as the internal frame expands with respect to the external frame, the former remains central in the external frame.
Closure between the internal frame 3 and the inside of the duct is made by closing plates 5 welded to the back of the external frame channel and bolted to the internal frame. Large eccentcic clearance holes are provided in the closing plates to allow the internal frame to expand towards the external frame. When bolting up, the nuts 6 are backed off (say 1/2 turn) and the nuts tack welded to the end of the bolt 7. The internal frame can slide in between the closing plates.
Care must be taken to ensure that the resistance due to the bolting does not cause the internal frame to deflect inwards more that can be accepted by the sealing system. This construction has the advantage that external shaft seals 8 can be fitted at tube extensions from the internal frame, outside the external frame. As the tube 9 and its flange 10 expands with the internal frame and blades the proper relationship between the shaft seal 11 and the sealing flange is maintained under all conditions.
The space between the closing plates and the internal and external frames may be partially filled with insulating material 12, mak ing allowance for expansion.
This construction may be applied to ducts of any shape. Circular ducts may be treated by making octagonal or round internal and external frames.
With this design of frame the sealing system mounted on the blades of the frame should be capable of taking up the differential expansion between blade and frame. Such a seal may be the bias spring seal described and claimed in British Patent No. 1 308801 or the low stress bias spring seal described and claimed in British Patent Application No.
7935497.
For louvre isolators which are to be fitted into new ducts or existing ducts which may be cut, and where the size of the unit causes there to be unacceptable deflection of the internal frame when using the construction described above with reference to Fig. 1 to 3 or where the materials selected or temperature differential imposes unacceptable differential expansion, the following alternative construction shown in Figs. 4 to 7 may be used.
In this case the internal frame 3 is divided into a number of sections 1 3 (for a rectangular or square duct eight, i.e. one at each corner and one for each side). The four corner lieces are bolted through pillars 14 or welded to pillars or otherwise fixed to the external frame 1, so that their location always remains fixed with respect to the external frame. The side pieces of the external frame are bolted to closing plates which are welded to the external frame (Fig. 4). The bolting arrangement is such that the internal frame side pieces are fixed at their centres but are allowed to expand towards the corner pieces, parallel to the duct plates. The capability to allow for this expansion is provided for by slotting the holes for the closing plate bolts in the direction parallel to the duct plates (Fig. 5).The centre bolt hole is not slotted so that a fixed point is provided. Between the corner pieces of the internal frame and the ends of the side pieces are gaps 1 5 to allow for the expansion to take place. To seal the gap under all temperature conditions a special internal frame seal 1 6 as shown in Fig. 6 and 7 is used. The end of the landing bar is slightly relieved before welding to the frame to allow the internal frame seal to slide between the bottom of the landing bar and the surface of the frame. The seal is bolted to one section of the internal frame and allowed to slide over the adjacent section to complete the seal at all positions. This construction may be applied to ducts of any shape.
For applications where the duct cannot be cut the following construction may be used.
The internal frame 3 is constructed in a number of parts (typically but not necessarily four) with provision made for bolting or welding the parts together on assembly. At the centre of each side of the internal frame a trunnion 4 is welded to the frame such that it may slide axially in a corresponding hole in the duct wall and in the external frame 1. This ensures that as the internal frame expands with respect to the external frame the former remains central in the external frame. In addition to this these trunnions transfer the weight of the whole isolator to the duct.
Closure between the internal frame and the inside of the duct is made by closing plates welded to the duct and bolted to the internal frame (see Fig. 8). Large clearance holes are provide in the closing plates to allow the internal frame to expand towards the duct.
When bolting up the nuts 6 are backed off (say 1/2 turn) and the nuts tack welded to the end of the bolt 7. The internal frame can slide between the closing plates. Care must be taken to ensure that the resistance due to the, bolting does not cause the internal frame to deflect inwards more than can be accepted by the sealing system. This construction has the advantage that external shaft seals 8 can be fitted at tube extensions from the internal frame, outside the external frame. As the tube 9 and its flange 10 expands with the internal frame and blades the proper relationship between the shaft seal 11 and the sealing flange will maintained under all conditions.
The space between the closing plates and the internal and external frame may be partially filled with insulating material, making allowance for expansion.
This construction may be applied to ducts of any shape. Circular ducts may be treated by making octagonal or round internal frames.
In this case the external frame can be square for simplicity.
Wherever holes are required in the ducts for stand off pillars, shafts, trunnions or for any other purpose, doubling plates are welded to the duct before burning the holes to compensate for the stress concentration at the holes.
With this design of frame the sealing system mounted on the blades or frame should be capable of taking up the differential expansion between blade and frame. Such a seal may be the bias spring seal described and claimed in British Patent No. 1308801 or the low stress bias spring seal described and claimed in British Patent Application No.
7935497.
For louvre isolators which are to be fitted into ducts or stacks which cannot be cut, and where the size of the unit causes there to be unacceptable deflection of the internal frame when using the construction described above or where the material selected or temperature differential imposes unacceptable differential expansion, the following alternative construction may be used.
In this case the internal frame is divided into a number of sections (for a rectangular or square duct eight, i.e. one at each corner and one for each side). The four corner pieces are
SPECIFICATION
Frames for isolators
This invention relates to frames for isolators, in particular main frames for isolators or dampers (herein referred to only as isolators) for lined ducts.
In many process plants where the operating temperature 5 is of the order of 500"C or above, the gas ducting is frequently made of mild steel and internally lined with refractory concrete. This has the advantage of reducing the cost of the ducting. However, for the manufacturer of high integrity isolating equipment such ducting presents difficulties compared with the method of external insulation.
These are:
1) The ducting, being lined on the inside thereof, does not expand while the internal parts of the isolator which are subject to hot gas expands relative to the duct walls;
2) Refractory concrete material tends to break away if sharp corners are exposed;
3) Refractory concrete connot be relied upon to make a satisfactory high integrity seal when applied to closing plates.
In addition there are a number of applications where it is desirable or even necessary to install an isolator without totally cutting the duct or stack into which it is to be installed. It is only with the recent emphasis on energy conservation that these difficulties have come to light. Previously the consequences of leaking isolators were not so serious; the leaks were tolerated and the economic implications were not understood.
The present invention provides a frame for an isolator, which frame comprises an internal frame part which will in use be exposed to flue gas and an external frame part which will in use be exposed to the atmosphere.
Thus by means of the present invention the inherent incompatibilities of differential expansion of the external and internal frame parts may be accommodated.
The internal frame may be optionally designed either in a number of sections with relative movement due to differential expansion occuring between the various sections with a change in temperature, or as a single section which expands relative to the external frame with a change in temperature.
The external frame will be normally, but not necessarily, of channel-shaped cross-section and may be bolted directly into the duct or, if the duct cannot be cut, the external frame may be located outside the duct.
The invention will be further described, by way of example only, with reference to the accompanying drawings, in which:
Figure 1 is a side view, partly in section, showing one embodiment of a main frame of an isolator for a lined duct, in accordance with the invention;
Figure 2 is a simplified end view of the isolator frame shown in Fig. 1;
Figure 3 is a section taken along the line
A-A in Fig. 2;
Figure 4 is a view similar to Fig. 1 showing another embodiment of an isolator main frame in accordance with the invention;
Figure 5 is an end view, partly cut away, of a corner of the main frame shown in Fig. 4;
Figure 5A is a view taken in the direction of the arrow B in Fig.5;
Figures 6 and 7 are end and perspective views respectively showing an internal frame seal which may be used in the embodiment shown in Figs. 4 and 5;;
Figures 8 and 9 are views similar to Fig. 1 showing further embodiments of isolator main frames in accordance with the invention; and
Figures 10 and 11 are plan views illustrating the main frame structure according to the invention as applied to guillotine isolators.
Fig. 1 shows an isolator main frame according to the invention which is suitable for application to louvre isolators which are to be fitted into new ducts or existing ducts which may be cut.
An external frame is bolted directly into a duct 2 as indicated, and an internal frame 3 is constructed in a number of parts (typically but not necessarily four) with provision made for bolting or welding the parts together on assembly. As best shown in Figs. 2 and 3, at the centre of each side of the internal frame a trunnion 4 is welded to the frame such that it may slide axially in a corresponding hole in the external frame. This ensures that as the internal frame expands with respect to the external frame, the former remains central in the external frame.
Closure between the internal frame 3 and the inside of the duct is made by closing plates 5 welded to the back of the external frame channel and bolted to the internal frame. Large eccentric clearance holes are provided in the closing plates to allow the internal frame to expand towards the external frame. When bolting up, the nuts 6 are backed off (say 1/2 turn) and the nuts tack welded to the end of the bolt 7. The internal frame can slide in between the closing plates.
Care must be taken to ensure that the resistance due to the bolting does not cause the internal frame to deflect inwards more that can be accepted by the sealing system. This construction has the advantage that external shaft seals 8 can be fitted at tube extensions from the internal frame, outside the external frame. As the tube 9 and its flange 10 expands with the internal frame and blades the proper relationship between the shaft seal 11 and the sealing flange is maintained under all conditions.
The space between the closing plates and the internal and external frames may be partially filled with insulating material 12, mak ing allowance for expansion.
This construction may be applied to ducts of any shape. Circular ducts may be treated by making octagonal or round internal and external frames.
With this design of frame the sealing system mounted on the blades of the frame should be capable of taking up the differential expansion between blade and frame. Such a seal may be the bias spring seal described and claimed in British Patent No. 1 308801 or the low stress bias spring seal described and claimed in British Patent Application No.
7935497.
For louvre isolators which are to be fitted into new ducts or existing ducts which may be cut, and where the size of the unit causes there to be unacceptable deflection of the internal frame when using the construction described above with reference to Fig. 1 to 3 or where the materials selected or temperature differential imposes unacceptable differential expansion, the following alternative construction shown in Figs. 4 to 7 may be used.
In this case the internal frame 3 is divided into a number of sections 1 3 (for a rectangular or square duct eight, i.e. one at each corner and one for each side). The four corner lieces are bolted through pillars 14 or welded to pillars or otherwise fixed to the external frame 1, so that their location always remains fixed with respect to the external frame. The side pieces of the external frame are bolted to closing plates which are welded to the external frame (Fig. 4). The bolting arrangement is such that the internal frame side pieces are fixed at their centres but are allowed to expand towards the corner pieces, parallel to the duct plates. The capability to allow for this expansion is provided for by slotting the holes for the closing plate bolts in the direction parallel to the duct plates (Fig. 5).The centre bolt hole is not slotted so that a fixed point is provided. Between the corner pieces of the internal frame and the ends of the side pieces are gaps 1 5 to allow for the expansion to take place. To seal the gap under all temperature conditions a special internal frame seal 1 6 as shown in Fig. 6 and 7 is used. The end of the landing bar is slightly relieved before welding to the frame to allow the internal frame seal to slide between the bottom of the landing bar and the surface of the frame. The seal is bolted to one section of the internal frame and allowed to slide over the adjacent section to complete the seal- at all positions. This construction may be applied to ducts of any shape.
For applications where the duct cannot be cut the following construction may be used.
The internal frame 3 is constructed in a number of parts (typically but not necessarily four) with provision made for bolting or welding the parts together on assembly. At the centre of each side of the internal frame a trunnion 4 is welded to the frame such that it may slide axially in a corresponding hole in the duct wall and in the external frame 1. This ensures that as the internal frame expands with respect to the external frame the former remains central in the external frame. In addition to this these trunnions transfer the weight of the whole isolator to the duct.
Closure between the internal frame and the inside of the duct is made by closing plates welded to the duct and bolted to the internal frame (see Fig. 8). Large clearance holes are provide in the closing plates to allow the internal frame to expand towards the duct.
When bolting up the nuts 6 are backed off (say 1/2 turn) and the nuts tack welded to the end of the bolt 7. The internal frame can slide between the closing plates. Care must be taken to ensure that the resistance due to the.
bolting does not cause the internal frame to deflect inwards more than can be accepted by the sealing system. This construction has the advantage that external shaft seals 8 can be - fitted at tube extensions from the internal frame, outside the external frame. As the tube 9 and its flange 10 expands with the internal frame and blades the proper relationship between the shaft seal 11 and the sealing flange will maintained under all conditions.
The space between the closing plates and the internal and external frame may be partially filled with insulating material, making allowance for expansion.
This construction may be applied to ducts of any shape. Circular ducts may be treated by making octagonal or round internal frames.
In this case the external frame can be square for simplicity.
Wherever holes are required in the ducts for stand off pillars, shafts, trunnions or for any other purpose, doubling plates are welded to the duct before burning the holes to compensate for the stress concentration at the holes.
With this design of frame the sealing system mounted on the blades or frame should be capable of taking up the differential expansion between blade and frame. Such a seal may be the bias spring seal described and claimed in British Patent No. 1 308801 or the low stress bias spring seal described and claimed in British Patent Application No.
7935497.
For louvre isolators which are to be fitted into ducts or stacks which cannot be cut, and where the size of the unit causes there to be unacceptable deflection of the internal frame when using the construction described above or where the material selected or temperature differnntial imposes unacceptable differential expansion, the following alternative construction may be used.
In this case the internal frame is divided into a number of sections (for a rectangular or square duct eight, i.e. one at each corner and one for each side). The four corner pieces are bolted through pillars through prepared holes in the duct to the external frame 1, so that their location always remains fixed with respect to the external frame. The side pieces of the external frame are bolted to closing plates which are welded to the duct (Fig. 9).
The bolting arrangement is such that the internal frame side pieces are fixed at their centres but are allowed to expand towards the corner pieces, parallel to the duct plates. The capability to allow for this expansion is provided for by slotting the holes for the closing plate bolts in the direction parallel to the duct plates. The centre bolt hole is not slotted so that a fixed point is provided. Between the corner pieces of the internal frame and the ends of the side pieces are gaps to allow for the expansion to take place. To seal the gap under all temperature conditions a special internal frame seal as shown in Figs. 6 and 7 is used. The end of the landing bar is slightly relieved before welding to the frame to allow the internal frame seal to slide between the bottom of the landing bar and the surface of the frame. The seal is bolted to one section of the internal frame and allowed to slide over the adjacent section to complete the seal in all positions. Wherever holes are required in the ducts for stand off pillars, shaft trunnions, or for any other purpose, doubling plates are welded to the duct before burning the holes to compensate for the stress concentrated at the holes.
This construction may be applied to ducts of any shape, as before.
It is often necessary to provide guillotine isolators for ducts which have internal lining.
While there have been described above constructions applicable to louvre and flap isolators similar principles apply to guillotine isolators. Typical sections are shown in Figs. 1 0 and 11.
Claims (5)
1. A frame for an isolator, which frame comprises an internal frame part which will in use be exposed to flue gas and an external frame which will in use be exposed to the atmosphere.
2. A frame as claimed in claim 1, wherein the internal frame part consists of a plurality of sections constituted by corner pieces which are fixed to the external frame part and side pieces spaced from the corner pieces in the plane of the internal frame part and expandable towards the corner pieces.
3. A frame as claimed in claim 1, wherein the internal frame part is constructed as a single section supported at the centres of its sides by trunnions axially movable in corner sponding holes formed in the external frame part whereby differential expansion between the internal and external frame parts may occur axially along each trunnion while the axes of the internal and external frame parts remain coincidental.
4. A frame as claimed in any of claims 1 to 3, wherein the external and internal frame parts are each substantially channel-shaped in cross-section.
5. A frame for an isolator, substantially as hereindescribed with reference to, and as shown in, Figs 1 to 3, Figs 4 and 5, Fig. 8 or
Fig. 9 of the accompanying drawings.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8002605A GB2069661A (en) | 1980-01-25 | 1980-01-25 | Housings for isolator valves |
| AU66031/81A AU6603181A (en) | 1980-01-25 | 1981-01-07 | Frames for dampers |
| NL8100191A NL8100191A (en) | 1980-01-25 | 1981-01-16 | FRAMES FOR INSULATORS. |
| DE19813101204 DE3101204A1 (en) | 1980-01-25 | 1981-01-16 | "RACK FOR FRAME VALVE AND THE LIKE" |
| JP890681A JPS56113923A (en) | 1980-01-25 | 1981-01-22 | Frame body for isolator |
| IT67084/81A IT1143303B (en) | 1980-01-25 | 1981-01-23 | FRAME FOR INSULATOR |
| FR8101270A FR2474636A1 (en) | 1980-01-25 | 1981-01-23 | CHASSIS FOR INSULATION BODIES, IN PARTICULAR FOR HOT GAS PIPES |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8002605A GB2069661A (en) | 1980-01-25 | 1980-01-25 | Housings for isolator valves |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB2069661A true GB2069661A (en) | 1981-08-26 |
Family
ID=10510895
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8002605A Withdrawn GB2069661A (en) | 1980-01-25 | 1980-01-25 | Housings for isolator valves |
Country Status (7)
| Country | Link |
|---|---|
| JP (1) | JPS56113923A (en) |
| AU (1) | AU6603181A (en) |
| DE (1) | DE3101204A1 (en) |
| FR (1) | FR2474636A1 (en) |
| GB (1) | GB2069661A (en) |
| IT (1) | IT1143303B (en) |
| NL (1) | NL8100191A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS60211222A (en) * | 1984-12-28 | 1985-10-23 | Niigata Eng Co Ltd | Air preheater |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1035433B (en) * | 1954-11-13 | 1958-07-31 | Steinmueller Gmbh L & C | Mechanically pressable seal for flap valves with rectangular flap |
| US3525328A (en) * | 1968-07-16 | 1970-08-25 | Forney Eng Co | Damper floating side rail bar |
| US3696804A (en) * | 1971-02-24 | 1972-10-10 | Forney Eng Co | Damper with double floating side rails |
| DE2820208C2 (en) * | 1978-05-09 | 1985-10-03 | Gert-Helmut Ing.(grad.) 3203 Sarstedt Gruber | Shut-off device, in particular pressure relief louvre |
-
1980
- 1980-01-25 GB GB8002605A patent/GB2069661A/en not_active Withdrawn
-
1981
- 1981-01-07 AU AU66031/81A patent/AU6603181A/en not_active Abandoned
- 1981-01-16 NL NL8100191A patent/NL8100191A/en not_active Application Discontinuation
- 1981-01-16 DE DE19813101204 patent/DE3101204A1/en not_active Ceased
- 1981-01-22 JP JP890681A patent/JPS56113923A/en active Pending
- 1981-01-23 IT IT67084/81A patent/IT1143303B/en active
- 1981-01-23 FR FR8101270A patent/FR2474636A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE3101204A1 (en) | 1981-12-03 |
| FR2474636A1 (en) | 1981-07-31 |
| IT8167084A0 (en) | 1981-01-23 |
| IT1143303B (en) | 1986-10-22 |
| NL8100191A (en) | 1981-08-17 |
| AU6603181A (en) | 1981-07-30 |
| JPS56113923A (en) | 1981-09-08 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2590803A (en) | Tank joint | |
| KR0161713B1 (en) | Valve with seal ring having edge welded laminations | |
| DE2523980A1 (en) | INSULATION FOR EXHAUST DUCTS | |
| US4058328A (en) | Heat-responsively self-sealing protective jacket for expansion joints | |
| CA2522613A1 (en) | Improved heat exchanger housing and seals | |
| AU702645B2 (en) | Heat pipe heat exchanger tube sheet | |
| US4383693A (en) | Seals for ducts | |
| US3703297A (en) | Articulated link seals | |
| GB2069661A (en) | Housings for isolator valves | |
| US5120021A (en) | Isolators | |
| JPS594880A (en) | Rotary kiln assembly, method of exchanging sealed structure and sealed structure used for rotary kiln assembly | |
| CA1130792A (en) | Casings for heat exchangers and burner/recuperator assemblies incorporating such casings | |
| EP0056374B1 (en) | Guillotine damper | |
| US4821771A (en) | Diverter valve with bellows seal | |
| US3732353A (en) | Moisture seal and fire barrier for electrical bus duct | |
| GB2042672A (en) | Thermol isolation of hot and cold parts especially in heat exchangers | |
| KR100307422B1 (en) | Assembly for adjustable installation of axial seal plates for rotary regenerative air preheaters | |
| US4363623A (en) | Casings for heat exchangers and burner/recuperator assemblies incorporating such casings | |
| US4338960A (en) | Guillotine type damper | |
| CA1214403A (en) | Piece with integrated heat-insulating covering | |
| US2528436A (en) | Stuffing box and expansion joint | |
| DE19506690A1 (en) | Arrangement for gas supply for high temperature components | |
| CN213233347U (en) | Sealed weir gate structure | |
| Heller et al. | Large ‘Single Blade’Diverters and Beyond | |
| GB2350295A (en) | Fire damper for a duct |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| WAP | Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1) |