CA1122583A - Valve sealing device - Google Patents
Valve sealing deviceInfo
- Publication number
- CA1122583A CA1122583A CA363,321A CA363321A CA1122583A CA 1122583 A CA1122583 A CA 1122583A CA 363321 A CA363321 A CA 363321A CA 1122583 A CA1122583 A CA 1122583A
- Authority
- CA
- Canada
- Prior art keywords
- annular
- valve
- fluid
- seal
- flow passage
- 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
Landscapes
- Lift Valve (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A sealing device for a valve which includes a valve body having a fluid passage and an inner valve for opening or closing said fluid passage, said sealing device comprising a seat packing disposed in a peripheral groove formed in the valve body and partly projecting therefrom into the fluid passage, said seat packing being so constructed that the durability and the fluid shut-off performance are promoted by the combined effect of the fluid pressure in the fluid passage acting against said seat packing and the elastic force of a metallic annular elastic member associated with said seat packing.
A sealing device for a valve which includes a valve body having a fluid passage and an inner valve for opening or closing said fluid passage, said sealing device comprising a seat packing disposed in a peripheral groove formed in the valve body and partly projecting therefrom into the fluid passage, said seat packing being so constructed that the durability and the fluid shut-off performance are promoted by the combined effect of the fluid pressure in the fluid passage acting against said seat packing and the elastic force of a metallic annular elastic member associated with said seat packing.
Description
gLlZ2~~3 The present invention relates to a valve including a valve body having a fluid passage and an inner valve for opening or closing said fluid passage and, more particularly, it relates to a sealing device for such valve to completely shut off the flow of fluid at the valve closed position.
It is an object of the present invention to provide a sealing device of self-adjustable, elastic seat packing type, which can completely shut off the flow of fluid, ir-respectively of the flowing direction of fluid relative to the sealing device and which has sufficiently high durability to keep its initial performance for a long time.
It is another object of the present invention to pro-vide a sealing device of self adjustable, elastic seat packing type, which utilizes the pressure of the fluid at the valve closed position to completely shut off the fluid even if the fluid is fed under high pressure.
It is a further object of the present invention to provide a sealing device for a valve of self-adjustable, elastic seat packing type, which employs a member of synthetic resin having no mechanical elasticity together with an elastic member of metallic material to supplement mechanical elasticity and restoring force.
It is a further object of the present invention to provide a valve which can be operated effectively with small operating force, while providing satisfactory shut-off per-formance.
In accordance with the present invention, there is provided a valve device comprising a valve body having a fluid flow passage and an annular groove extending around and opening toward said flow passage, said valve body including at least one retainer shoulder in said annular groove; a valve pivotally mounted in said valve body for opening and '~ZZ~3 closing said flow passage, and having a peripheral surface; an annular seal of syntheti~ resin disposed loosely in said annular groove and having at least one annular shoulder engageable with said retainer shoulder for the retention of said seal in said groove, said annular seal including an annular protion projecting radially inwardly into said flow passage for engagement with said peripheral surface of the valve upon closing thereof, and an annular peripheral contact surface facing radially outwardly toward a radial boundary sur-face of said annular groove, said annular seal having a first annular pressure chamber of a substantially V-shaped cross section opening at an axial surface thereof in fluid com-munication with said flow passage, and a second annular pressure chamber opening radially outwardly adjacent to said annular contact surface in fluid communication with said ~low passage;
and a resilient metal stiffener ring of a substantially V-shaped cross section disposed substantially complementarily in said first pressure chamber for reinforcing said annular seal, said stiffener ring including an annular flange interposed between said axial surface of the annular seal and an axial boundary surface of said annular groove, said first and second pressure chambers being selectively pressuriæable upon closing of said valve for either radially pressing said contact surface and said annular portion of said seal respectively against said radial boundary surface and said peripheral surface of the valve or axially pressing said flange of the stif~ener ring against said axial boundary surface.
The inventlon is illustrated by way of example in the accompanying drawings wherein:
Figure 1 is a fragmentary enlarged sectional view of an embodiment of the sealing device according to the present invention, showning principal parts of the device in the state ~122S~
where the inner valve for shutting off the flow of fluid does not act against the sealing device;
Figure 2 is a fragmentary enlarged sectional view of the device, showing the principal parts of the device in the state where the inner valve for shutting off the flow of fluid acts against the sealing device to shut off the flow of fluid;
Figure 3 is a longitudinal sectional view showing another embodiment oI the sealing device of the present in-vention applied to a butterfly valve;
Figure 4 is a sectional view taken along line a-a in Figure 3, Figure 5 shows another embodiment of the sealing device according to the present invention which is applied to a valve having a ball-type inner valve;
Figure 6 is a fragmentary enlarged sectional view of a modified form in which fluid pressure introducing slots are formed in the seat packing according to the present invention;
Figure 7 is a sectional view ta~en along line b-b in Figure 6.
~owl the invention will be explained with reference to Figures 1 - 7. In the drawings, 1 is a seat packing, 2 is a valve body, 3 is a retainer of the seat packing, 4 is an inner valve for opening or closing the flow of fluid, 5 is a seat surface which is adapted to come into sealing contact with the seat packing 1 to completely shut off the flow of fluid, 6 is metallic elastic member whîch serves to prevent the seat packing from subjecting to a permanent deformation at the time of shut off of the fluid flow, 7 is a screw for fixing the seat packing retainer 3 to the valve body 2, 8 is a clearance formed between the side surface of the seat packing 1 and the groove :~lZ2513;~
having a nearly T-shape cross section, 9 is a first fluid pressure introducing chamber formed by the metallic elastic member having a nearly V-shape cross section and 10 is a second fluid pressure introducing chamber formed between the seat packing 1 and the valve body 2.
~ ow the seat packing 1 will be explained more in detail. The groove having a nearly T-shape cross section is formed in transverse direction to the fluid passage and the seat packing 1 is inserted in said groove. The seat packing 1 has an inclined surface 11 at the contact portion with the inner valve, a shoulder 12 formed on at least one of its side surfaces transverse to said fluid passage in order to prevent said seat packing from wholly projecting into said fluid passage and a recessed portion formed on the part opposite to said fluid passage to form the second fluid intrcducing chamber 10.
In case where a synthetic resin having a lower mechanical strength is employed, it is advantageous to tightly fit the seat packing 1 in the nearly T-shaped groove. In this case, it is necessary to form fluid pressure introducing passages 26 in the side surface of the seat packing 1, as shown in Figures 6 and 7. If the fluid pressure is relatively low, such passage may not be required~
The seat packing 1 may be advantageously made of synthetic resin having a superior wear-resistant property such as tetrafluoroethylene.
In the em~odiments as shown in Figures 3 - 5, the valve sealing device according to the present invention is applied to the valve body. The valve sealing device may be also applied to the inner valve, without any change in its performance. Furthermore, this valve sealing device is not limited to the forms as described above and may be 22SB:~
modified or changed in various ways.
Referring to Figures 3 - 7, 21 is a valve rod which is inserted into a through-hole formed in the inner valve 4, supported in a bore formed in the valve body and projects outward of the valve body 2, 22 is a pin for fixing the valve rod 21 and the inner valve 4 together, 23 is a seal ring for preventing the fluid from leaking out of the valve body 2, 24 is an operating handle for manually rotating the inner valve 4 for 90 degrees at maximum to open or close the fluid passage or to adjust the opening angle to any desired angle, 25 is a pin for fixing the valve rod 21 and the handle 24 together, and 26 is the fluid pressure introducing passage.
The valve body 2 is interposed between flanges of pipes (not shown in Figures 1 - 7), to open or close the fluid flow passing through the pipeline.
Now the sealing action of the valve sealing device according to the present invention will be explàined in detail with reference to Figures 1 and 2.
Firstly, it is assumed that the valve sealing device according to the present invention is mounted as shown in Figure 1 and then the inner valve 4 for shutting off the fluid flow is operated by manual force or automatic operating device using pneumatic, hydraulic, electric or other means, to the valve closing position. Then the seat sur~ace 5 of the inner valve 4 comes into contact with the seat contact portion il of the seat packing 1. Thus the seat packing 1 is urged toward the side opposite to the fluid passage side and the elastic member 6 of metallic material is simultaneously compressed so that the reaction force is increase~. Accordingly the contact pressure between the seat surface 5 of the inner valve 4 and the seat contact portion 11 of the seat packing 1 is increased, to completely shu~ off the fluid flow.
i~22583 ~ extly, when the inner valve 4 is operated to passage opening position, that is, the seat surface 5 is moved away from the contact position with the seat contact portion 11 of the seat packing 1, the seat packing 1 res~ores its original shape as shown in Figure 1, under the action of the metallic elastic member 6.
` According to the sealing device according to the present invention, in addition to the action of the metallic elastic m~mber as described above, the fluid pressure is u-tilized to hold the contact pressure between the seat packingand the inner valve at optimum value relatively to the value of fluid pxessure, so that stable and complete shut-off is obtained at any fluid pressure from high to low fluid pressure.
Now, it is assumed that the fluid passes in the direction as indicated by the arrow in Figure 2. In the state where the inner valve 4 acts to close the fluid passage, the fluid pressure passes through the clearance 8 to the first fluid pressure introducing chamber 9, where it acts on the metallic elastic member, so that the force of urging the seat packing 1 against the seat surface 5 of the inner valve 4 is produced, depending the difference between the fluid pressure acting on said member and that acting on the contact portion 11 of the seat packing 1 with the inner valve~ The fluid pressure simultaneously acts to increase the sealing pressure at the sealing surface 13, thereby completely shutting off the flow of fluid.
According to the construction of the prasent ~nvention as described above, it is not necessary to increase the initial seat contact surface pressure, namely the seat contact surface pressure at the time when no ~luid pressure is applied, in pro-portion to the increase of the fluid pressure, as in the con ventional construction of valve, and it is possible to keep ~ZZ~i~3 the initial seat contact surface pressure at a constant value, irrespectively of the fluid pressure, so that the force re-quired to operate the valve can be held at a very small value.
The sealing device according to the present invention has a further advantage in that it can utilize the action of the fluid pressure even if the fluid is passed in opposite direction to that indicated by the arrow in Figure 2. If the fluid is passed in the direction opposite to that of the arrow in Figure 2, the fluid pressure at the closing position of the inner valve 4 passes through-the clearance 8 between the seat packing 1 and the valve body 2 into the fl~lid pressure introducing chamber 10, so that the force acting to urge the seat packing against the valve seat surfabe 5 is generated, in the same manner as described above, and at the same time the fluid pressure acts to urge the seat packing to the metallic elastic member 6 to secure the sealing effect toward the do~nstream side.
In the valve for the purpose of completely shutting off the fluid passage, it is impossible to attain the complete shut off by the metal-to-metal contact, and therefore resins having superior wear-resistant property such as tetrafluoro-ethylene are employed at the contact portion. However, even if such material is used in the conventional valve, it is only possible to obtain good initial performance during a short period and it is impossible to produce a valve having good durability, so that it cannot be applied to a valve which is frequently opened and closed.
The sealing device according to the present invention eliminates all of the defects of the prior art as described above and provides a valve having superior performance at a very low cost, since the sealing device can keep its initial performance for a long period and also it is resistant to - ~ZZ5~3 relatively high temperature (about 250~C) which is usable limit temperature o~ the synthetic resin used.
It is an object of the present invention to provide a sealing device of self-adjustable, elastic seat packing type, which can completely shut off the flow of fluid, ir-respectively of the flowing direction of fluid relative to the sealing device and which has sufficiently high durability to keep its initial performance for a long time.
It is another object of the present invention to pro-vide a sealing device of self adjustable, elastic seat packing type, which utilizes the pressure of the fluid at the valve closed position to completely shut off the fluid even if the fluid is fed under high pressure.
It is a further object of the present invention to provide a sealing device for a valve of self-adjustable, elastic seat packing type, which employs a member of synthetic resin having no mechanical elasticity together with an elastic member of metallic material to supplement mechanical elasticity and restoring force.
It is a further object of the present invention to provide a valve which can be operated effectively with small operating force, while providing satisfactory shut-off per-formance.
In accordance with the present invention, there is provided a valve device comprising a valve body having a fluid flow passage and an annular groove extending around and opening toward said flow passage, said valve body including at least one retainer shoulder in said annular groove; a valve pivotally mounted in said valve body for opening and '~ZZ~3 closing said flow passage, and having a peripheral surface; an annular seal of syntheti~ resin disposed loosely in said annular groove and having at least one annular shoulder engageable with said retainer shoulder for the retention of said seal in said groove, said annular seal including an annular protion projecting radially inwardly into said flow passage for engagement with said peripheral surface of the valve upon closing thereof, and an annular peripheral contact surface facing radially outwardly toward a radial boundary sur-face of said annular groove, said annular seal having a first annular pressure chamber of a substantially V-shaped cross section opening at an axial surface thereof in fluid com-munication with said flow passage, and a second annular pressure chamber opening radially outwardly adjacent to said annular contact surface in fluid communication with said ~low passage;
and a resilient metal stiffener ring of a substantially V-shaped cross section disposed substantially complementarily in said first pressure chamber for reinforcing said annular seal, said stiffener ring including an annular flange interposed between said axial surface of the annular seal and an axial boundary surface of said annular groove, said first and second pressure chambers being selectively pressuriæable upon closing of said valve for either radially pressing said contact surface and said annular portion of said seal respectively against said radial boundary surface and said peripheral surface of the valve or axially pressing said flange of the stif~ener ring against said axial boundary surface.
The inventlon is illustrated by way of example in the accompanying drawings wherein:
Figure 1 is a fragmentary enlarged sectional view of an embodiment of the sealing device according to the present invention, showning principal parts of the device in the state ~122S~
where the inner valve for shutting off the flow of fluid does not act against the sealing device;
Figure 2 is a fragmentary enlarged sectional view of the device, showing the principal parts of the device in the state where the inner valve for shutting off the flow of fluid acts against the sealing device to shut off the flow of fluid;
Figure 3 is a longitudinal sectional view showing another embodiment oI the sealing device of the present in-vention applied to a butterfly valve;
Figure 4 is a sectional view taken along line a-a in Figure 3, Figure 5 shows another embodiment of the sealing device according to the present invention which is applied to a valve having a ball-type inner valve;
Figure 6 is a fragmentary enlarged sectional view of a modified form in which fluid pressure introducing slots are formed in the seat packing according to the present invention;
Figure 7 is a sectional view ta~en along line b-b in Figure 6.
~owl the invention will be explained with reference to Figures 1 - 7. In the drawings, 1 is a seat packing, 2 is a valve body, 3 is a retainer of the seat packing, 4 is an inner valve for opening or closing the flow of fluid, 5 is a seat surface which is adapted to come into sealing contact with the seat packing 1 to completely shut off the flow of fluid, 6 is metallic elastic member whîch serves to prevent the seat packing from subjecting to a permanent deformation at the time of shut off of the fluid flow, 7 is a screw for fixing the seat packing retainer 3 to the valve body 2, 8 is a clearance formed between the side surface of the seat packing 1 and the groove :~lZ2513;~
having a nearly T-shape cross section, 9 is a first fluid pressure introducing chamber formed by the metallic elastic member having a nearly V-shape cross section and 10 is a second fluid pressure introducing chamber formed between the seat packing 1 and the valve body 2.
~ ow the seat packing 1 will be explained more in detail. The groove having a nearly T-shape cross section is formed in transverse direction to the fluid passage and the seat packing 1 is inserted in said groove. The seat packing 1 has an inclined surface 11 at the contact portion with the inner valve, a shoulder 12 formed on at least one of its side surfaces transverse to said fluid passage in order to prevent said seat packing from wholly projecting into said fluid passage and a recessed portion formed on the part opposite to said fluid passage to form the second fluid intrcducing chamber 10.
In case where a synthetic resin having a lower mechanical strength is employed, it is advantageous to tightly fit the seat packing 1 in the nearly T-shaped groove. In this case, it is necessary to form fluid pressure introducing passages 26 in the side surface of the seat packing 1, as shown in Figures 6 and 7. If the fluid pressure is relatively low, such passage may not be required~
The seat packing 1 may be advantageously made of synthetic resin having a superior wear-resistant property such as tetrafluoroethylene.
In the em~odiments as shown in Figures 3 - 5, the valve sealing device according to the present invention is applied to the valve body. The valve sealing device may be also applied to the inner valve, without any change in its performance. Furthermore, this valve sealing device is not limited to the forms as described above and may be 22SB:~
modified or changed in various ways.
Referring to Figures 3 - 7, 21 is a valve rod which is inserted into a through-hole formed in the inner valve 4, supported in a bore formed in the valve body and projects outward of the valve body 2, 22 is a pin for fixing the valve rod 21 and the inner valve 4 together, 23 is a seal ring for preventing the fluid from leaking out of the valve body 2, 24 is an operating handle for manually rotating the inner valve 4 for 90 degrees at maximum to open or close the fluid passage or to adjust the opening angle to any desired angle, 25 is a pin for fixing the valve rod 21 and the handle 24 together, and 26 is the fluid pressure introducing passage.
The valve body 2 is interposed between flanges of pipes (not shown in Figures 1 - 7), to open or close the fluid flow passing through the pipeline.
Now the sealing action of the valve sealing device according to the present invention will be explàined in detail with reference to Figures 1 and 2.
Firstly, it is assumed that the valve sealing device according to the present invention is mounted as shown in Figure 1 and then the inner valve 4 for shutting off the fluid flow is operated by manual force or automatic operating device using pneumatic, hydraulic, electric or other means, to the valve closing position. Then the seat sur~ace 5 of the inner valve 4 comes into contact with the seat contact portion il of the seat packing 1. Thus the seat packing 1 is urged toward the side opposite to the fluid passage side and the elastic member 6 of metallic material is simultaneously compressed so that the reaction force is increase~. Accordingly the contact pressure between the seat surface 5 of the inner valve 4 and the seat contact portion 11 of the seat packing 1 is increased, to completely shu~ off the fluid flow.
i~22583 ~ extly, when the inner valve 4 is operated to passage opening position, that is, the seat surface 5 is moved away from the contact position with the seat contact portion 11 of the seat packing 1, the seat packing 1 res~ores its original shape as shown in Figure 1, under the action of the metallic elastic member 6.
` According to the sealing device according to the present invention, in addition to the action of the metallic elastic m~mber as described above, the fluid pressure is u-tilized to hold the contact pressure between the seat packingand the inner valve at optimum value relatively to the value of fluid pxessure, so that stable and complete shut-off is obtained at any fluid pressure from high to low fluid pressure.
Now, it is assumed that the fluid passes in the direction as indicated by the arrow in Figure 2. In the state where the inner valve 4 acts to close the fluid passage, the fluid pressure passes through the clearance 8 to the first fluid pressure introducing chamber 9, where it acts on the metallic elastic member, so that the force of urging the seat packing 1 against the seat surface 5 of the inner valve 4 is produced, depending the difference between the fluid pressure acting on said member and that acting on the contact portion 11 of the seat packing 1 with the inner valve~ The fluid pressure simultaneously acts to increase the sealing pressure at the sealing surface 13, thereby completely shutting off the flow of fluid.
According to the construction of the prasent ~nvention as described above, it is not necessary to increase the initial seat contact surface pressure, namely the seat contact surface pressure at the time when no ~luid pressure is applied, in pro-portion to the increase of the fluid pressure, as in the con ventional construction of valve, and it is possible to keep ~ZZ~i~3 the initial seat contact surface pressure at a constant value, irrespectively of the fluid pressure, so that the force re-quired to operate the valve can be held at a very small value.
The sealing device according to the present invention has a further advantage in that it can utilize the action of the fluid pressure even if the fluid is passed in opposite direction to that indicated by the arrow in Figure 2. If the fluid is passed in the direction opposite to that of the arrow in Figure 2, the fluid pressure at the closing position of the inner valve 4 passes through-the clearance 8 between the seat packing 1 and the valve body 2 into the fl~lid pressure introducing chamber 10, so that the force acting to urge the seat packing against the valve seat surfabe 5 is generated, in the same manner as described above, and at the same time the fluid pressure acts to urge the seat packing to the metallic elastic member 6 to secure the sealing effect toward the do~nstream side.
In the valve for the purpose of completely shutting off the fluid passage, it is impossible to attain the complete shut off by the metal-to-metal contact, and therefore resins having superior wear-resistant property such as tetrafluoro-ethylene are employed at the contact portion. However, even if such material is used in the conventional valve, it is only possible to obtain good initial performance during a short period and it is impossible to produce a valve having good durability, so that it cannot be applied to a valve which is frequently opened and closed.
The sealing device according to the present invention eliminates all of the defects of the prior art as described above and provides a valve having superior performance at a very low cost, since the sealing device can keep its initial performance for a long period and also it is resistant to - ~ZZ5~3 relatively high temperature (about 250~C) which is usable limit temperature o~ the synthetic resin used.
Claims (5)
1. A valve device comprising:
(a) a valve body having a fluid flow passage and an annular groove extending around and opening toward said flow passage, said valve body including at least one retainer shoulder in said annular groove;
(b) a valve pivotally mounted in said valve body for opening and closing said flow passage, and having a peripheral surface;
(c) an annular seal of synthetic resin disposed loosely in said annular groove and having at least one annular shoulder engageable with said retainer shoulder for the retention of said seal in said groove, said annular seal including an annular portion projecting radially inwardly into said flow passage for engagement with said peripheral surface of the valve upon closing thereof, and an annular peripheral contact surface facing radially outwardly toward a radial boundary surface of said annular groove, said annular seal having a first annular pressure chamber of a substantially V-shaped cross section opening at an axial surface thereof in fluid communication with said flow passage, and a second annular pressure chamber opening radially outwardly adjacent to said annular contact surface in fluid communication with said flow passage; and (d) a resilient metal stiffener ring of a substantially V-shaped cross ection disposed substantailly complementarily in said first pressure chamber for reinforcing said annular seal, said stiffener ring including an annular flange inter-posed between said axial surface of the annular seal and an axial boundary surface of said annular groove, said first and second pressure chambers being selectively pressurizable upon closing of said valve for either radially pressing said contact surface and said annular portion of said seal res-pectively against said radial boundary surface and said peripheral surface of the valve or axially pressing said flange of the stiffener ring against said axial boundary surface.
(a) a valve body having a fluid flow passage and an annular groove extending around and opening toward said flow passage, said valve body including at least one retainer shoulder in said annular groove;
(b) a valve pivotally mounted in said valve body for opening and closing said flow passage, and having a peripheral surface;
(c) an annular seal of synthetic resin disposed loosely in said annular groove and having at least one annular shoulder engageable with said retainer shoulder for the retention of said seal in said groove, said annular seal including an annular portion projecting radially inwardly into said flow passage for engagement with said peripheral surface of the valve upon closing thereof, and an annular peripheral contact surface facing radially outwardly toward a radial boundary surface of said annular groove, said annular seal having a first annular pressure chamber of a substantially V-shaped cross section opening at an axial surface thereof in fluid communication with said flow passage, and a second annular pressure chamber opening radially outwardly adjacent to said annular contact surface in fluid communication with said flow passage; and (d) a resilient metal stiffener ring of a substantially V-shaped cross ection disposed substantailly complementarily in said first pressure chamber for reinforcing said annular seal, said stiffener ring including an annular flange inter-posed between said axial surface of the annular seal and an axial boundary surface of said annular groove, said first and second pressure chambers being selectively pressurizable upon closing of said valve for either radially pressing said contact surface and said annular portion of said seal res-pectively against said radial boundary surface and said peripheral surface of the valve or axially pressing said flange of the stiffener ring against said axial boundary surface.
2. A valve device according to claim 1, wherein said first annular pressure chamber is located radially inwardly of said annular contact surface.
3. A valve device according to claim 1, wherein said second annular pressure chamber is substantially axially aligned with said annular flange of the stiffener ring with said annular contact surface being interposed therebetween.
4. A valve device according to claim 1, wherein said annular flange of the stiffener ring extends radially between said first annular pressure chamber and said annular contact surface.
5. A valve device according to claim 1, wherein said V-shaped stiffener ring is solid in its entirety.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA363,321A CA1122583A (en) | 1980-10-27 | 1980-10-27 | Valve sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA363,321A CA1122583A (en) | 1980-10-27 | 1980-10-27 | Valve sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1122583A true CA1122583A (en) | 1982-04-27 |
Family
ID=4118270
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA363,321A Expired CA1122583A (en) | 1980-10-27 | 1980-10-27 | Valve sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1122583A (en) |
-
1980
- 1980-10-27 CA CA363,321A patent/CA1122583A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |