CA1062003A - Sealing bodies for high temperature applications - Google Patents
Sealing bodies for high temperature applicationsInfo
- Publication number
- CA1062003A CA1062003A CA234,330A CA234330A CA1062003A CA 1062003 A CA1062003 A CA 1062003A CA 234330 A CA234330 A CA 234330A CA 1062003 A CA1062003 A CA 1062003A
- Authority
- CA
- Canada
- Prior art keywords
- resilient sealing
- sealing body
- heat resistant
- flexible
- sealing
- 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
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
- F16J15/12—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering
- F16J15/121—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing with metal reinforcement or covering with metal reinforcement
Abstract
Abstract of the Disclosure The invention relates to resilient sealing bodies of flexible fibrous heat resistant material. Such bodies are used on either hori-zontal or vertical sealing surfaces in high temperature applications.
The fibrous materials of the sealing bodies are compressed and retained in the compressed state with suitable flexible holding means. The bodies are suitable for the replacement of horizontal sand seals in high temperature usage and may be used equally well in applications which are impractical for sand seals, such as vertical and overhead applications.
The sectional construction and flexibility of the sealing bodies permit their ready application and adjustment to give the optimum degree of sealing action as required in high temperature equipment.
The fibrous materials of the sealing bodies are compressed and retained in the compressed state with suitable flexible holding means. The bodies are suitable for the replacement of horizontal sand seals in high temperature usage and may be used equally well in applications which are impractical for sand seals, such as vertical and overhead applications.
The sectional construction and flexibility of the sealing bodies permit their ready application and adjustment to give the optimum degree of sealing action as required in high temperature equipment.
Description
N24-42 Can.
106'~0()3 SEaLING BODIES FOR HIGH TEMPE~ATIJRE APPLIC~IONS
The increasing use of high temperature furnaces for the heat ~reat-ment of various metallic articles at controlled temperature and under controlled furnace atmospheres has led to considerable changes in furnace design, These types of furnaces are generally designed for intermittent operation, with fluctuating heating cycles and periodic removal and replacement of workpieces. In many applications, the workpiece must be heated in a controlled atmosphere. This at sphere may be a reducing gas~ such as carbon monoxide or non-oxidizing, such as nitrogen or argon.
Since the furnace must be readily opened and closed to permit changing the workpieces, it is apparent that a reliable type of sealing means must be used around the doors or similar parts of the furnace which are opened and closed periodically. Adequate seals not onlypermit the retention of the desired interior atmosphere of the furnace, but they also aid in maintaining a more even heat distribution to the treated articles within the furnace.
For furnace operations of this type, satisfactory seals have been difficult to achieve, due primarily to the high temperatures at which the seal must function. These temperatures may be as high as 1500-2000F
so that common elastic sealing materials such as rubber, or rubber coated textile materials are, of course, out of the question. A commonly used seal is a horizontal channel fllled with sand, into which the edges of the movable furnace cover can be immersed. While this type of seal is inexpensive and withstands high temperatures, it can perform only on a horizontal surface and the sand is easily blown out. Other types of seals have been developed in which fibers such as those of asbestos are used. While these may be used on vertical surfaces, the fibers are rather soft and tend to work loose over a period of time, thus requiring frequent maintenance to continue their sealing effective-ness. There is a need, therefore, for an improved resilient type of sealing body which can withstand high temperatures and can function in any position either horizontal or vertical. The sealing body should be of a type easily installed to replace present sand seals and should continue its sealing properties with a minimum amount of maintenance.
The invention provides a resilient sealing body for high tempera-ture applications, the body having flexible longitudinal shape and comprising fibers of heat resistant material. The body is reinforced by a flexible heat resistant holding means for retaining the body under compression. The heat resistant fibers are made from materials such as aluminum gilicate, alumina, silica, boron carbide, silicon carbide, glass or mixtures thereof and the holding means may be one or more wires or S~e/ :
B strips of heat resistant metals such as ~b~ brass, bronze, or stain-less steel. The sealing body preferably deines a rectangular cross section and may conveniently be from 9 to 12 inches in length, the holding means being applied and fastened to hold the body under longitu-dinal compression.
Fig. 1 shows the resilient sealing body of the invention as a solid body of fibrous material.
Fig. 2 shows one of the wire loops which is passed through the resilient sealing body to reinforce it and hold it under compression.
Fig. 3 shows one of the component pieces for a built-up resilient sealing body of the invention.
Fig. 4 shows the body of the invention as assembled from component pieces.
Fig. 5 shows a sectional side view of one form of heat treating furnace, using the resilient sealing body of the invention Fig 6 shows a sectional top view of the furnace of Fig. 5, shwing the circular arrangement of the sealing bodies in the furnace base Fig. 7 shows an enlarged sectional view of the sealing body of the invention in place within a holding slot in a furnace structure.
The resilient sealing body of the invention is made from a com-pressed heat-resistant flexible fibrous material, the body being formed into a longitudinal or linear shape and being reinforced by flexible heat resistant holding means, the holding means retaining the body under longitudinal compression. One form of this body is shown generally as 12 in Pig. 1, the body being formed from resilient fibrous material having a felt-like structure, which may be needled if desired. The body 12 comprises heat resistant fibrous material which is selected from materials such as alumlnum silicate, alumina, silica, boron car-bide, silicon carbide, glass or mixtures of these. Aluminum silicate is a preferred material, fibers of this being available under the trade mark FIBERFRAN~, a product of The Carborundum Company, Niagara Falls, N.Y. The body 12 is preferably formed with a rectangular cross section, as shown in Fig. 1. While this shape is preferred, the body may be made with a square or circular cross section if desired. The height and width of the cross sectional dimensions of the body may be varied as desired to give bodies which will fit snugly within appropri-ate holding grooves or slots in the surfaces of high temperature appa-ratus.
The length or linear dimension of the body 12 may vary from about 12 to about 15 inches, the body is then longitudinally compressed to a length of about 8 1/2 to about 13 inches, corresponding to a reduction in length or linear dimension to about 70 to about 85% of the uncom-pressed length of the body. While an 8 1/2 to 13 inch linear dimension is preferred from the stand point of easier construction and installa-tion as sealing units, the bodies may be made longer or shorter if desired for special uses. The body is held under compression by hold-ing means which may comprise one or more wire loops 14 which are passed completely through the body from one end, the ends of the loops being twisted together at the other end to hold the body 12 under compression.
The loops 14 are shown inserted in the body 12 in Fig. l, one of the loops is shown separately in Fig. 2. The wire is preferably a stainless steel o about No. 10 Browne & Sharp gauge (0.102 inches diameter), although the diameter used may vary from 9 to 11 Brown & Sharpe gauge, depending upon the density of the fibrous material used in the body. -While the wire as shown in Figs. 1 and 2 is a preferred holding means, the invention is not restricted to wire but may employ flexible metal strips instead. In addition to stainless steel, the wires or strips may be made of other heat resistant metals such as steel, brass or bronze, ~ --depending on the type of service in which the sealing body will be used.
Although the sealing body of the invention has been described as a solid body and illustrated as such in Fig. 1, a preferred embodiment is a sealing body made from the assembly of a plurality o flat pieces of 1exlble ibrous material. One o these pieces is shown in Fig. 3, the piece 16 being formed from resilient fibrous material having a felt-like structure, which may be needled if desired. While a non-woven material is preferred, the piece 16 may also be made from a woven material. The fibrous material comprising the piece 16 is heat resistant, the fibers being selected from materials such as those previously described. The piece 16 is preferably cut in a rectangular shape, as shown in Fig. 3.
While this shape is preferred, the invention is not restricted to this but the piece 16 may be square or even circular in shape if desired.
The thickness of the piece 16 is not critical, but may preferably range from about 1/4 to about 1/2 inch. The height and width of the piece may be varied as desired, depending on the size required for the finished sealing body.
The preferred resilient sealing body 18 of the invention is formed by assembling a plurality of the pieces 16, describing in the preceding paragraph, in a stacked array, as shown in Fig. 4. Sufficient pieces are used to form a body with a linear dimension of about 12 to about 106Z0~3 15 inches. This body is then compressed longitudinally to a linear dimension of about 8 1/2 to about 13 inches, corresponding to a reduction in length of about 70 to about 85% of the uncompressed length of the body. The compressed body 18 is held under compression by holding means such as wire loops 14 which are passed completely through the stacked array from one end, the ends of the loops being twisted together at the other end to hold the body 18 under longitudinal compression as previously described for the solid body 12.
One of the applications in which the sealing body of the invention is highly effective is shown in Fig. 5, which illustrates a sectional side view of a heat treating furnace, shown generally at 20. The fur-nace comprises a metal base plate 22 holding a stool plate 24, the stool being either metal or ceramic material. The stool 24 supports one or re workpieces 26 or heat treatment. A circular inner cover 28 encloses the workpieces and allows the maintenance of a controlled atmosphere 30 around the workpieces during heat treatment. An outer cover 31 (shown partially) acts to enclose the furnace and heating units (heating units are not shown). The lower rim of the movable cover 28 rests upon a ring of sealing bodies 18, the sealing bodies being held in a circular groove or rectangular cross section 32 which is cut in the base plate 22. In Fig. 6, a sectional top view above the furnace base plate 22 shows how the sealing bodies 18 are butted together within the circular groove 32 to give a complete ring of sealing material, shown generally at 34. A
re detailed view of the placement of the sealing body 18 of the inven-tion is illustrated in Fig. 7. Since the sealing bodies are flexible and resilient, they can be shaped to be slightly larger than the dimen-sions of the slot 32, thus insuring a snug fit when inserted in the slot. The flexibility of the bodies 18 allow them to bend to follow the curvature of the slot 32. In the installation as shown in Figs.
and 6, the bodies 18 are abutted end to end to give a firm ring 34 106Z003 .... .. ..
of essentially continuous sealing surfaceO Since the sealing bodies 18 are resilient, the weight of the cover 28 causes its lower rim to depress the bodiesslightly at the point of contact, thus insuring a satisfactory seal all around the rim of the coverO The seal thus forméd is markedly 5an.~ :
superior to that formed by the layers of ~R previously used. As previously noted, sand forms a loose seal and tends to blow out under momentary gas pressure surges, the sand requiring periodic replacement to maintain its sealing effectiveness. ~ -While the resilient sealing bodies of the invention are shown as replacing horizontal sand seals in a heat treatment furnace, this is for illustration only and does not limit the seals to thi~ type of appllcation. It is apparent that the resilient sealing bodies of the invention may be used equally well in applications requiring vertical and overhead seals, applications which are impractical for sand seals.
The sealing bodies of the invention may therefore be used for furnace door seals, soaking pit cover seals and in applications where the seal-ing gurfaces may be tilted from the horizontal or subjected to mechanical vibrations. The sectional construction and flexibility of the sealing bodies permits their rapid installation without the requirements of refractory cements to hold the sealing bodies in placeO
Repair and replacement of damaged sections is easily made and the amount of fiber compression in the bodies may be regulated as desired to give the optimum degree of sealing action best suited to the particular application desired.
106'~0()3 SEaLING BODIES FOR HIGH TEMPE~ATIJRE APPLIC~IONS
The increasing use of high temperature furnaces for the heat ~reat-ment of various metallic articles at controlled temperature and under controlled furnace atmospheres has led to considerable changes in furnace design, These types of furnaces are generally designed for intermittent operation, with fluctuating heating cycles and periodic removal and replacement of workpieces. In many applications, the workpiece must be heated in a controlled atmosphere. This at sphere may be a reducing gas~ such as carbon monoxide or non-oxidizing, such as nitrogen or argon.
Since the furnace must be readily opened and closed to permit changing the workpieces, it is apparent that a reliable type of sealing means must be used around the doors or similar parts of the furnace which are opened and closed periodically. Adequate seals not onlypermit the retention of the desired interior atmosphere of the furnace, but they also aid in maintaining a more even heat distribution to the treated articles within the furnace.
For furnace operations of this type, satisfactory seals have been difficult to achieve, due primarily to the high temperatures at which the seal must function. These temperatures may be as high as 1500-2000F
so that common elastic sealing materials such as rubber, or rubber coated textile materials are, of course, out of the question. A commonly used seal is a horizontal channel fllled with sand, into which the edges of the movable furnace cover can be immersed. While this type of seal is inexpensive and withstands high temperatures, it can perform only on a horizontal surface and the sand is easily blown out. Other types of seals have been developed in which fibers such as those of asbestos are used. While these may be used on vertical surfaces, the fibers are rather soft and tend to work loose over a period of time, thus requiring frequent maintenance to continue their sealing effective-ness. There is a need, therefore, for an improved resilient type of sealing body which can withstand high temperatures and can function in any position either horizontal or vertical. The sealing body should be of a type easily installed to replace present sand seals and should continue its sealing properties with a minimum amount of maintenance.
The invention provides a resilient sealing body for high tempera-ture applications, the body having flexible longitudinal shape and comprising fibers of heat resistant material. The body is reinforced by a flexible heat resistant holding means for retaining the body under compression. The heat resistant fibers are made from materials such as aluminum gilicate, alumina, silica, boron carbide, silicon carbide, glass or mixtures thereof and the holding means may be one or more wires or S~e/ :
B strips of heat resistant metals such as ~b~ brass, bronze, or stain-less steel. The sealing body preferably deines a rectangular cross section and may conveniently be from 9 to 12 inches in length, the holding means being applied and fastened to hold the body under longitu-dinal compression.
Fig. 1 shows the resilient sealing body of the invention as a solid body of fibrous material.
Fig. 2 shows one of the wire loops which is passed through the resilient sealing body to reinforce it and hold it under compression.
Fig. 3 shows one of the component pieces for a built-up resilient sealing body of the invention.
Fig. 4 shows the body of the invention as assembled from component pieces.
Fig. 5 shows a sectional side view of one form of heat treating furnace, using the resilient sealing body of the invention Fig 6 shows a sectional top view of the furnace of Fig. 5, shwing the circular arrangement of the sealing bodies in the furnace base Fig. 7 shows an enlarged sectional view of the sealing body of the invention in place within a holding slot in a furnace structure.
The resilient sealing body of the invention is made from a com-pressed heat-resistant flexible fibrous material, the body being formed into a longitudinal or linear shape and being reinforced by flexible heat resistant holding means, the holding means retaining the body under longitudinal compression. One form of this body is shown generally as 12 in Pig. 1, the body being formed from resilient fibrous material having a felt-like structure, which may be needled if desired. The body 12 comprises heat resistant fibrous material which is selected from materials such as alumlnum silicate, alumina, silica, boron car-bide, silicon carbide, glass or mixtures of these. Aluminum silicate is a preferred material, fibers of this being available under the trade mark FIBERFRAN~, a product of The Carborundum Company, Niagara Falls, N.Y. The body 12 is preferably formed with a rectangular cross section, as shown in Fig. 1. While this shape is preferred, the body may be made with a square or circular cross section if desired. The height and width of the cross sectional dimensions of the body may be varied as desired to give bodies which will fit snugly within appropri-ate holding grooves or slots in the surfaces of high temperature appa-ratus.
The length or linear dimension of the body 12 may vary from about 12 to about 15 inches, the body is then longitudinally compressed to a length of about 8 1/2 to about 13 inches, corresponding to a reduction in length or linear dimension to about 70 to about 85% of the uncom-pressed length of the body. While an 8 1/2 to 13 inch linear dimension is preferred from the stand point of easier construction and installa-tion as sealing units, the bodies may be made longer or shorter if desired for special uses. The body is held under compression by hold-ing means which may comprise one or more wire loops 14 which are passed completely through the body from one end, the ends of the loops being twisted together at the other end to hold the body 12 under compression.
The loops 14 are shown inserted in the body 12 in Fig. l, one of the loops is shown separately in Fig. 2. The wire is preferably a stainless steel o about No. 10 Browne & Sharp gauge (0.102 inches diameter), although the diameter used may vary from 9 to 11 Brown & Sharpe gauge, depending upon the density of the fibrous material used in the body. -While the wire as shown in Figs. 1 and 2 is a preferred holding means, the invention is not restricted to wire but may employ flexible metal strips instead. In addition to stainless steel, the wires or strips may be made of other heat resistant metals such as steel, brass or bronze, ~ --depending on the type of service in which the sealing body will be used.
Although the sealing body of the invention has been described as a solid body and illustrated as such in Fig. 1, a preferred embodiment is a sealing body made from the assembly of a plurality o flat pieces of 1exlble ibrous material. One o these pieces is shown in Fig. 3, the piece 16 being formed from resilient fibrous material having a felt-like structure, which may be needled if desired. While a non-woven material is preferred, the piece 16 may also be made from a woven material. The fibrous material comprising the piece 16 is heat resistant, the fibers being selected from materials such as those previously described. The piece 16 is preferably cut in a rectangular shape, as shown in Fig. 3.
While this shape is preferred, the invention is not restricted to this but the piece 16 may be square or even circular in shape if desired.
The thickness of the piece 16 is not critical, but may preferably range from about 1/4 to about 1/2 inch. The height and width of the piece may be varied as desired, depending on the size required for the finished sealing body.
The preferred resilient sealing body 18 of the invention is formed by assembling a plurality of the pieces 16, describing in the preceding paragraph, in a stacked array, as shown in Fig. 4. Sufficient pieces are used to form a body with a linear dimension of about 12 to about 106Z0~3 15 inches. This body is then compressed longitudinally to a linear dimension of about 8 1/2 to about 13 inches, corresponding to a reduction in length of about 70 to about 85% of the uncompressed length of the body. The compressed body 18 is held under compression by holding means such as wire loops 14 which are passed completely through the stacked array from one end, the ends of the loops being twisted together at the other end to hold the body 18 under longitudinal compression as previously described for the solid body 12.
One of the applications in which the sealing body of the invention is highly effective is shown in Fig. 5, which illustrates a sectional side view of a heat treating furnace, shown generally at 20. The fur-nace comprises a metal base plate 22 holding a stool plate 24, the stool being either metal or ceramic material. The stool 24 supports one or re workpieces 26 or heat treatment. A circular inner cover 28 encloses the workpieces and allows the maintenance of a controlled atmosphere 30 around the workpieces during heat treatment. An outer cover 31 (shown partially) acts to enclose the furnace and heating units (heating units are not shown). The lower rim of the movable cover 28 rests upon a ring of sealing bodies 18, the sealing bodies being held in a circular groove or rectangular cross section 32 which is cut in the base plate 22. In Fig. 6, a sectional top view above the furnace base plate 22 shows how the sealing bodies 18 are butted together within the circular groove 32 to give a complete ring of sealing material, shown generally at 34. A
re detailed view of the placement of the sealing body 18 of the inven-tion is illustrated in Fig. 7. Since the sealing bodies are flexible and resilient, they can be shaped to be slightly larger than the dimen-sions of the slot 32, thus insuring a snug fit when inserted in the slot. The flexibility of the bodies 18 allow them to bend to follow the curvature of the slot 32. In the installation as shown in Figs.
and 6, the bodies 18 are abutted end to end to give a firm ring 34 106Z003 .... .. ..
of essentially continuous sealing surfaceO Since the sealing bodies 18 are resilient, the weight of the cover 28 causes its lower rim to depress the bodiesslightly at the point of contact, thus insuring a satisfactory seal all around the rim of the coverO The seal thus forméd is markedly 5an.~ :
superior to that formed by the layers of ~R previously used. As previously noted, sand forms a loose seal and tends to blow out under momentary gas pressure surges, the sand requiring periodic replacement to maintain its sealing effectiveness. ~ -While the resilient sealing bodies of the invention are shown as replacing horizontal sand seals in a heat treatment furnace, this is for illustration only and does not limit the seals to thi~ type of appllcation. It is apparent that the resilient sealing bodies of the invention may be used equally well in applications requiring vertical and overhead seals, applications which are impractical for sand seals.
The sealing bodies of the invention may therefore be used for furnace door seals, soaking pit cover seals and in applications where the seal-ing gurfaces may be tilted from the horizontal or subjected to mechanical vibrations. The sectional construction and flexibility of the sealing bodies permits their rapid installation without the requirements of refractory cements to hold the sealing bodies in placeO
Repair and replacement of damaged sections is easily made and the amount of fiber compression in the bodies may be regulated as desired to give the optimum degree of sealing action best suited to the particular application desired.
Claims (14)
1. A resilient sealing body for high temperature applications, said body including compressed heat resistant flexible fibrous material selected from the group consisting of aluminum silicate, alumina, silica, boron carbide, sili-con carbide, glass and mixtures thereof; and flexible heat resistant metallic holding means consisting of one or more wires or strips of metal selected from the group consisting of steel, brass, bronze and stainless steel, disposed within said body, for retaining the body under compression.
2. A resilient sealing body according to claim 1, in which said body has a longitudinal shape and comprises pieces of heat resistant flexible fibrous material dis-posed in stacked array.
3. A resilient sealing body according to claim 2, in which the length of the body is reduced to about 70 to about 85% of its uncompressed length by longitudinal com-pression.
4. A resilient sealing body according to claim 2, in which said flexible member is wire having a diameter ranging from about 9 to about 11 Browne & Sharpe gauge.
5. A resilient sealing body according to claim 4, in which said wire is stainless steel, said wire having a diameter of about 10 Browne & Sharpe gauge.
6. A resilient sealing body according to claim 1, in which the flexible heat resistant metallic wire holding means comprises wire loops which are passed completely through the body from one end.
7. A resilient sealing body according to claim 6, in which the ends of the loops are twisted together so as to hold the resilient sealing body in compression.
8. A resilient sealing body according to claim 1, comprising a plurality of flat pieces of flexible fibrous material.
9. A resilient sealing body according to claim 1, having a rectangular cross-section.
10. A resilient sealing body according to claim 1, having a compressed length of about 8-1/2 to about 13 inches.
11. A method for making a resilient sealing body according to claim 1, the method comprising:
(a) forming a flexible longitudinally shaped body of said heat resistant fibrous material, (b) inserting said at least one flexible heat resistant metallic holding means within said body, (c) compressing said body in a longitudinal direction, and (d) fastening said holding means for retaining said body under compression.
(a) forming a flexible longitudinally shaped body of said heat resistant fibrous material, (b) inserting said at least one flexible heat resistant metallic holding means within said body, (c) compressing said body in a longitudinal direction, and (d) fastening said holding means for retaining said body under compression.
12. A method according to claim 11, further comprising the steps of forming at least one flat piece of flexible heat resistant fibrous material and assembling a plurality of said pieces in stacked array for forming said flexible longitudinally shaped body.
13. A method according to claim 11, in which said heat resistant holding means is wire having a diameter ranging from about 9 to about 11 Browne & Sharpe gauge.
14. A method according to claim 11, in which the length of the body is reduced to from about 70 to about 85% of its uncompressed length by said longitudinal compression.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US50541874A | 1974-09-12 | 1974-09-12 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1062003A true CA1062003A (en) | 1979-09-11 |
Family
ID=24010226
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA234,330A Expired CA1062003A (en) | 1974-09-12 | 1975-08-26 | Sealing bodies for high temperature applications |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPS5916138B2 (en) |
| CA (1) | CA1062003A (en) |
| DE (1) | DE2540482A1 (en) |
| ZA (1) | ZA755760B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5234048A (en) * | 1991-01-14 | 1993-08-10 | Ngk Insulators, Ltd. | Sealing members for gas preheaters, and sealing structures using such sealing members for gas preheaters |
| US5316072A (en) * | 1989-07-19 | 1994-05-31 | Ngk Insulators, Ltd. | Sealing members for use in gas preheater |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4346730A (en) * | 1981-01-14 | 1982-08-31 | The United States Of America As Represented By The United States Department Of Energy | Valve for abrasive material |
| US4492382A (en) * | 1983-12-21 | 1985-01-08 | J. T. Thorpe Company | Refractory fiber ladle preheater sealing rings |
-
1975
- 1975-08-26 CA CA234,330A patent/CA1062003A/en not_active Expired
- 1975-09-10 ZA ZA00755760A patent/ZA755760B/en unknown
- 1975-09-11 JP JP50109516A patent/JPS5916138B2/en not_active Expired
- 1975-09-11 DE DE19752540482 patent/DE2540482A1/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5316072A (en) * | 1989-07-19 | 1994-05-31 | Ngk Insulators, Ltd. | Sealing members for use in gas preheater |
| US5234048A (en) * | 1991-01-14 | 1993-08-10 | Ngk Insulators, Ltd. | Sealing members for gas preheaters, and sealing structures using such sealing members for gas preheaters |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5916138B2 (en) | 1984-04-13 |
| JPS5154146A (en) | 1976-05-13 |
| DE2540482A1 (en) | 1976-03-25 |
| ZA755760B (en) | 1976-07-28 |
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