CA1153947A - Noise-damped mixer valve - Google Patents
Noise-damped mixer valveInfo
- Publication number
- CA1153947A CA1153947A CA000368316A CA368316A CA1153947A CA 1153947 A CA1153947 A CA 1153947A CA 000368316 A CA000368316 A CA 000368316A CA 368316 A CA368316 A CA 368316A CA 1153947 A CA1153947 A CA 1153947A
- Authority
- CA
- Canada
- Prior art keywords
- noise
- damped
- valve
- mixer
- damping
- 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
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- Details Of Valves (AREA)
- Multiple-Way Valves (AREA)
Abstract
NOISE-DAMPED MIXER VALVE
ABSTRACT OF THE DISCLOSURE
A noise-damped mixer valve with a control cartridge which is inserted into the valve housing and which has a rigidly arranged valve-seat plate and at least one movable control plate arranged above same, especially a single-lever mixer, wherein a noise-damping adapter has been provided in the valve housing between the housing bottom and the rigidly arranged valve-seat plate, said noise-damping adapter having a hot-water inlet channel, a cold-water inlet channel and an outlet channel, and at least the outlet channel or the water inlet channels being provided with noise-damping fittings.
ABSTRACT OF THE DISCLOSURE
A noise-damped mixer valve with a control cartridge which is inserted into the valve housing and which has a rigidly arranged valve-seat plate and at least one movable control plate arranged above same, especially a single-lever mixer, wherein a noise-damping adapter has been provided in the valve housing between the housing bottom and the rigidly arranged valve-seat plate, said noise-damping adapter having a hot-water inlet channel, a cold-water inlet channel and an outlet channel, and at least the outlet channel or the water inlet channels being provided with noise-damping fittings.
Description
-- 1153~
Noise-damPed mixer valve The invention relates to a noise-damped mixer valve with a control cartridge which is inserted into the valve housing, especially a single-lever mixer.
To damp noises which are generated by flowing water in sanitary fittings, it is known to introduce damping elements of resilient materials into the water-pipe or to install these on the wall of the building.
It is also known to accommodate sound-damping elements in the form of a permanently resilient intermediate piece in the body of the unit (German Offenlegungs-schrift 2,421,372). A further embodiment provides that a permanently resilient intermediate piece with two channels, that is to say one channel each for hot water and cold water, is arranged in the fastening extension of a single-hole mixer unit.
However, none of these known measures fulfils its function to a satisfactory extent. Although noise is conducted and also amplified by the waterpipe, it is generally not generated in the waterpipe, that is to say all the elements which are fitted in the water-pipe or in the fastening extension of a mixer unit are too far removed from the noise source to effect a genu-ine noise damping.
Noise occurs in the valve when the cross-section of water flow changes. In many cases, it accompanies _ _ .. . . .
:
- ~153~7
Noise-damPed mixer valve The invention relates to a noise-damped mixer valve with a control cartridge which is inserted into the valve housing, especially a single-lever mixer.
To damp noises which are generated by flowing water in sanitary fittings, it is known to introduce damping elements of resilient materials into the water-pipe or to install these on the wall of the building.
It is also known to accommodate sound-damping elements in the form of a permanently resilient intermediate piece in the body of the unit (German Offenlegungs-schrift 2,421,372). A further embodiment provides that a permanently resilient intermediate piece with two channels, that is to say one channel each for hot water and cold water, is arranged in the fastening extension of a single-hole mixer unit.
However, none of these known measures fulfils its function to a satisfactory extent. Although noise is conducted and also amplified by the waterpipe, it is generally not generated in the waterpipe, that is to say all the elements which are fitted in the water-pipe or in the fastening extension of a mixer unit are too far removed from the noise source to effect a genu-ine noise damping.
Noise occurs in the valve when the cross-section of water flow changes. In many cases, it accompanies _ _ .. . . .
:
- ~153~7
- 2 -the appearance of cavitation, as a result of which, in addition, damage to the mixer valve or to the individ-ual valve is caused.
In order to combat the incidence of noise directly at the point where the change of cross-section occurs, it has already been proposed, in the case of valves which control the water flow by means of plates sliding on one another, to introduce fittings into the mixing chamber of the control plate of the valve (German Offenlegungsschrift 2,356,326). These fittings con-sist substantially of sieves, or sieve packs, through which the water has to flow before it can pass from the inlet to the outlet. However, the disadva~tage of fitting these sieves, or sieve packs, is that the nor-mal pipeline network is never completely free of impurities, which means that deposits of rust or dirt render the sieve ineffective after a short time, so that either the passage of water is considerably obstructed, possibly even blocked entirely, with, in the former case, noise formation again arising, or the sieve is designed as a self-cleaning sieve (German Offenlegungs-schrift 2,753,287). In this case, a considerably enlarged mixing chamber is required, that is to say the valve becomes substantially more expensive from the point of view of construction. In spite of this expense, it is, even then, not guaranteed that relatively large particles of rust or dirt will not lead to clogging.
m e object of-the invention is therefore to ~ .~ .
. .
~S3~
provide for sanitary fittingsa noise-damping arrangement which can be installed in the immediate vicinity of the noise source, is largely fault-~roof, that is to say virtually does not be-come clogged, and, furthermore, can be replaced or cleaned easily.
Accordingly, the present invention provides a noise-damped mixer valve, particularly a single-lever mixer, which comprises: a valve housing; a control cartridge inserted into the valve housing; said control cartridge including a station-ary valve-seat plate and at least one movable control plate arranged in face-to-face relationship with the stationary valve plate; a noise-damping adapter provided in the valve housing between a bottom part thereof and the stationary valve-seat plate; said noise-damping adapter having at least one hot-water inlet channel and one cold-water inlet channel, said in-let channels being provided with noise-damping fittings compris-ing resilient inserts at least partially surrounded by air chambers.
By arranging a noise-damping adapter in the valve hous-ing between the valve-seat plate and housing bottom, the noise-damping elements are only a few millimeters removed from the original source of the noise. Appropriately, the noise-damping 2S adapter is an integral part of the cartridge, but it can just as advantageously be inserted as a separate part between the cartridge bottom and housing bottom. It is thus easily possible to exchange the adapter or to take it out, clean it and then insert it again.
According to a preferred embodiment of the invention, the water inlet channels andtox the water ~ 3 --~q~
.~?
' -- llS3~47' outlet channel are provided with a resilient hose insert which consists preferably of an elastomeric material. The vibrations of the flowing water which arise are thereby damped, in the supply and/or return to the location of the change in cross-section, by means of the resilient hose insert, elastomeric material having an especially good damping effect.
Advantageously, the hose inserts are designed so that they have sealing end faces, that is to say they fully cover the height of the noise-damping adapter, project slightly beyond same and thus constitute, at the same time, the seal between the cartridge bottom on the one side and the housing bottom on the other side. In this case, the end faces are appropriately designed as a sealingring, so that not the full end face, but only its margin,provides a seal.
A preferred embodiment of the invention pro-! vides that the hose insert has a shoulder which sealsoff an air chamber in the noise-damping adapter.
This air chamber is a widened bore, or slot, which is designed unidirectionally, appropriately from the hous-ing bottom towards the cartridge bottom for water inlet and ~rom the cartridge bottom towards the housing bot-tom for outlet~ The hose insert is thus surrounded by air in a certain region and here can expand, that is to say yield resiliently, according to the incoming water pressure.
Appropriately, the hose insert has bracing spikes and/or bracing ribs. These bracing spikes or 1153~7 bracing ribs are arranged advantageously in the region of the air chamber of the noise-damping adapter~ hence in the region in which the largest possible expansion of the hose insert takes place. The spring action of the hose insert is varied by means of irregularly distributed bracing spikes andtor bracing ribs, that is to say this spring action can be adapted to the most diverse frequencies which occur.
A further, very advantageous embodiment of the invention provides that the water inlet channels and/or the outlet channel have sieve inserts. In this case, according to a further appropriate embodiment of the invention, the sieve inserts are made conical or pyramidal.
Due to the fitting of sieves the flowing water is divided into fine individual streams. A stabil-izing of the water flow is consequently effected.
is stabllizing is, of course, reinforced due to the fact that both the water inlet and the water outlet are equipped with sieves.
Because the sieves are designed with a conical or pyramidal shape, it is ensured that impurities which are carried along from the pipeline network by the water cannot settle on the sieve. m e sieve apex is always directed against the direction of the water flow. Consequently, impurities, which have been carried along, are, as they pass over the apex, washed away from the water to the sidejwherethey can eithersettle harmlessly or be washed away through openings located ~153~4q next to the sieve~
A very appropriate e~bodiment of the invention therefore also provides that the sieve insert is moun-ted on supporting studs so that the water can also pass alongside the sieve. Silted particles of rust or dirt are thereby washed away via the sieve and, since the sieve rests, analogously to a roof, on columns, can pass through the water channel along these columns, that is to say the supporting studs.
A further improvement is obtained due to the fact that the sieve insert is mounted resiliently.
Because of the resilient mounting of the sieve insert, a vibration of the sieve occurs when water flows through, said vibration, on the one hand, leading to the self-cleaning of the sieve, but also, on the other hand, influencing the frequency of the sound level which arises, that is to say an additional noise damping is obtained due to the vibration of the sieve insert.
A further appropriate embodiment of the inven-tion provides that the sieve insert has a sieve with a mesh width of 0.1 to 1.5 mm. m e selected mesh width range of the sieve ensures that optimum noise damping is achieved, without the risk that particles will settle in the sieve and thus reduce the noise damping. It is evident that if the mesh width range is exceeded, that is to say if the mesh width is enlarged, a reduction of the noise damping will result.
A narrowing of the free cross-section of the meshes produces such a high resistance to flow that the desired "'' ` ~153~q discharge rate from the mixer valve can no longer be achieved.
A further advantageous embodiment of the inven-tion provides that several sieves are arranged above one another, with, according to an appropriate embodi-ment of the invention, the sieves being offset relative to one another.
Because the sieves are arranged above one another with a small relative spacing, the noise-damping effect which has already been obtained with a sieve is reinforced. By offsetting the sieves relative to one another, the water jet which has already been div-ided by the first sieve is divided again, thus resulting in an additional noise damping.
m e invention is described below with reference to drawings wherein:
Figures 1 and 6 show a section through the lower reg-ion of a valve housing with inserted cartridge and inserted noise-damping adapter.
Figure 2 shows a section through the noise-damping adapter in plan view.
Figure 3 shows a hose insert in side view.
Figure-4 -shows a section through the noise-damping adapter in ~ront view and Figure 5 shows the noise-damping adapter in plan view.
~ A noise-damping adapter 5 on which rests a cartridge 3 is inserted into the valve housing 1.
The noise adapter 5 thereby engages tightly between the housing bottom 2 and cartridge bottom 4. m e . : ~S35~4 -- 8 _ cartridge 3 is equipped with ceramic sealing plates, of which only the valve-seat plate 19 is, however, illustrated. This is sealed in the cartridge 3 by means of an 0-ring 20.
The noise-damping adapter 5 is a plastic injection-molding and consists preferably of polyamide.
It is made substantially cylindrical and carries seal-ing rings 22 in two annular grooves 21 upon its outer region. m ese rings 22 seal off the noise-damping adapter 5 from the valve housing 1 in the region of the annular channel 23.
The hot-water inlet channel 6 and the cold-water inlet channel 7, which are arcuate according to Figure 2 and circular according to Figure 5, have noise-damping fittings. These noise-damping fittings can consist of the hose insert 9 according to Figures 1, 2, ~, 5 and 6 or of the sieve inserts 14 according to Fig-ure 4. Analogously, the outlet 8, which is designed as a central outlet in Figures 1, 2 and 6, can also be provided optionally with sieve inserts 14 according to Figures 1 and 6 or with hose inserts 9.
The hose inserts 9 have,at their opposing ends, end faces 10 which lead into a sealing ring 11. This sealing ring 11 is connected, under compressive stress, to the water inlet openings 24 of the housing bottom 2 and to the corresponding openings in the valve-seat plate 19.
However, the hose insert 9 does not completely fill the inside diameter of the hot-water inlet channel _ g _ 6 or cold-water inlet channel 7 or of the outlet chan-nel 8, since these channels have an air chamber 13 which is closed by means of a shoulder 12 on the hose insert . In the region of the air chamber 13, the hose inserts 9 are provided with bracing spikes 16 and/or bracing ribs 17, and these bracing spikes 16 and/or bracing ribs 17 can extend up to the wall of the air chamber 13 and are also arranged at least partly at a certain spacing therefrom, so that contact between the wall of the air chamber 13 and the bracing spikes 16 or bracing ribs 17 takes place only if the hose insert 9 is loaded with a certain pressure.
As may be seen from Figure 4, a sieve insert 14 can bff inserted, instead of the hose inserts 9, into the cold-water inlet channel 7 or analogously into the ,hot-water inlet channel 6 or the out,let channel 8.
In so doing, the sieve insert 14 has a sieve 18 which is shaped in the form of a cone and which is mounted on resilient supporting studs 15. m e supporting studs 15 are braced in the recess 25 of the channels 6, 7 and 8 and the apex of the sieve 18 is always directed against the direction of water flow.
It is important, here, that there remains between the sieve 18 and the recess 25 a free space 26 which is confined only by the resilient supporting studs 15 and which permits the passage of particles of dirt which have been carried along in the water and which slip over the sieve.
Figure 6 illustrates the noise-damping adapter . , ...
~15394~
5 as an integral part of the cartridge 3. A simpli-fied assembly of the fittings in the valve housing 19 with the same function being maintained, is thereby achieved.
In order to combat the incidence of noise directly at the point where the change of cross-section occurs, it has already been proposed, in the case of valves which control the water flow by means of plates sliding on one another, to introduce fittings into the mixing chamber of the control plate of the valve (German Offenlegungsschrift 2,356,326). These fittings con-sist substantially of sieves, or sieve packs, through which the water has to flow before it can pass from the inlet to the outlet. However, the disadva~tage of fitting these sieves, or sieve packs, is that the nor-mal pipeline network is never completely free of impurities, which means that deposits of rust or dirt render the sieve ineffective after a short time, so that either the passage of water is considerably obstructed, possibly even blocked entirely, with, in the former case, noise formation again arising, or the sieve is designed as a self-cleaning sieve (German Offenlegungs-schrift 2,753,287). In this case, a considerably enlarged mixing chamber is required, that is to say the valve becomes substantially more expensive from the point of view of construction. In spite of this expense, it is, even then, not guaranteed that relatively large particles of rust or dirt will not lead to clogging.
m e object of-the invention is therefore to ~ .~ .
. .
~S3~
provide for sanitary fittingsa noise-damping arrangement which can be installed in the immediate vicinity of the noise source, is largely fault-~roof, that is to say virtually does not be-come clogged, and, furthermore, can be replaced or cleaned easily.
Accordingly, the present invention provides a noise-damped mixer valve, particularly a single-lever mixer, which comprises: a valve housing; a control cartridge inserted into the valve housing; said control cartridge including a station-ary valve-seat plate and at least one movable control plate arranged in face-to-face relationship with the stationary valve plate; a noise-damping adapter provided in the valve housing between a bottom part thereof and the stationary valve-seat plate; said noise-damping adapter having at least one hot-water inlet channel and one cold-water inlet channel, said in-let channels being provided with noise-damping fittings compris-ing resilient inserts at least partially surrounded by air chambers.
By arranging a noise-damping adapter in the valve hous-ing between the valve-seat plate and housing bottom, the noise-damping elements are only a few millimeters removed from the original source of the noise. Appropriately, the noise-damping 2S adapter is an integral part of the cartridge, but it can just as advantageously be inserted as a separate part between the cartridge bottom and housing bottom. It is thus easily possible to exchange the adapter or to take it out, clean it and then insert it again.
According to a preferred embodiment of the invention, the water inlet channels andtox the water ~ 3 --~q~
.~?
' -- llS3~47' outlet channel are provided with a resilient hose insert which consists preferably of an elastomeric material. The vibrations of the flowing water which arise are thereby damped, in the supply and/or return to the location of the change in cross-section, by means of the resilient hose insert, elastomeric material having an especially good damping effect.
Advantageously, the hose inserts are designed so that they have sealing end faces, that is to say they fully cover the height of the noise-damping adapter, project slightly beyond same and thus constitute, at the same time, the seal between the cartridge bottom on the one side and the housing bottom on the other side. In this case, the end faces are appropriately designed as a sealingring, so that not the full end face, but only its margin,provides a seal.
A preferred embodiment of the invention pro-! vides that the hose insert has a shoulder which sealsoff an air chamber in the noise-damping adapter.
This air chamber is a widened bore, or slot, which is designed unidirectionally, appropriately from the hous-ing bottom towards the cartridge bottom for water inlet and ~rom the cartridge bottom towards the housing bot-tom for outlet~ The hose insert is thus surrounded by air in a certain region and here can expand, that is to say yield resiliently, according to the incoming water pressure.
Appropriately, the hose insert has bracing spikes and/or bracing ribs. These bracing spikes or 1153~7 bracing ribs are arranged advantageously in the region of the air chamber of the noise-damping adapter~ hence in the region in which the largest possible expansion of the hose insert takes place. The spring action of the hose insert is varied by means of irregularly distributed bracing spikes andtor bracing ribs, that is to say this spring action can be adapted to the most diverse frequencies which occur.
A further, very advantageous embodiment of the invention provides that the water inlet channels and/or the outlet channel have sieve inserts. In this case, according to a further appropriate embodiment of the invention, the sieve inserts are made conical or pyramidal.
Due to the fitting of sieves the flowing water is divided into fine individual streams. A stabil-izing of the water flow is consequently effected.
is stabllizing is, of course, reinforced due to the fact that both the water inlet and the water outlet are equipped with sieves.
Because the sieves are designed with a conical or pyramidal shape, it is ensured that impurities which are carried along from the pipeline network by the water cannot settle on the sieve. m e sieve apex is always directed against the direction of the water flow. Consequently, impurities, which have been carried along, are, as they pass over the apex, washed away from the water to the sidejwherethey can eithersettle harmlessly or be washed away through openings located ~153~4q next to the sieve~
A very appropriate e~bodiment of the invention therefore also provides that the sieve insert is moun-ted on supporting studs so that the water can also pass alongside the sieve. Silted particles of rust or dirt are thereby washed away via the sieve and, since the sieve rests, analogously to a roof, on columns, can pass through the water channel along these columns, that is to say the supporting studs.
A further improvement is obtained due to the fact that the sieve insert is mounted resiliently.
Because of the resilient mounting of the sieve insert, a vibration of the sieve occurs when water flows through, said vibration, on the one hand, leading to the self-cleaning of the sieve, but also, on the other hand, influencing the frequency of the sound level which arises, that is to say an additional noise damping is obtained due to the vibration of the sieve insert.
A further appropriate embodiment of the inven-tion provides that the sieve insert has a sieve with a mesh width of 0.1 to 1.5 mm. m e selected mesh width range of the sieve ensures that optimum noise damping is achieved, without the risk that particles will settle in the sieve and thus reduce the noise damping. It is evident that if the mesh width range is exceeded, that is to say if the mesh width is enlarged, a reduction of the noise damping will result.
A narrowing of the free cross-section of the meshes produces such a high resistance to flow that the desired "'' ` ~153~q discharge rate from the mixer valve can no longer be achieved.
A further advantageous embodiment of the inven-tion provides that several sieves are arranged above one another, with, according to an appropriate embodi-ment of the invention, the sieves being offset relative to one another.
Because the sieves are arranged above one another with a small relative spacing, the noise-damping effect which has already been obtained with a sieve is reinforced. By offsetting the sieves relative to one another, the water jet which has already been div-ided by the first sieve is divided again, thus resulting in an additional noise damping.
m e invention is described below with reference to drawings wherein:
Figures 1 and 6 show a section through the lower reg-ion of a valve housing with inserted cartridge and inserted noise-damping adapter.
Figure 2 shows a section through the noise-damping adapter in plan view.
Figure 3 shows a hose insert in side view.
Figure-4 -shows a section through the noise-damping adapter in ~ront view and Figure 5 shows the noise-damping adapter in plan view.
~ A noise-damping adapter 5 on which rests a cartridge 3 is inserted into the valve housing 1.
The noise adapter 5 thereby engages tightly between the housing bottom 2 and cartridge bottom 4. m e . : ~S35~4 -- 8 _ cartridge 3 is equipped with ceramic sealing plates, of which only the valve-seat plate 19 is, however, illustrated. This is sealed in the cartridge 3 by means of an 0-ring 20.
The noise-damping adapter 5 is a plastic injection-molding and consists preferably of polyamide.
It is made substantially cylindrical and carries seal-ing rings 22 in two annular grooves 21 upon its outer region. m ese rings 22 seal off the noise-damping adapter 5 from the valve housing 1 in the region of the annular channel 23.
The hot-water inlet channel 6 and the cold-water inlet channel 7, which are arcuate according to Figure 2 and circular according to Figure 5, have noise-damping fittings. These noise-damping fittings can consist of the hose insert 9 according to Figures 1, 2, ~, 5 and 6 or of the sieve inserts 14 according to Fig-ure 4. Analogously, the outlet 8, which is designed as a central outlet in Figures 1, 2 and 6, can also be provided optionally with sieve inserts 14 according to Figures 1 and 6 or with hose inserts 9.
The hose inserts 9 have,at their opposing ends, end faces 10 which lead into a sealing ring 11. This sealing ring 11 is connected, under compressive stress, to the water inlet openings 24 of the housing bottom 2 and to the corresponding openings in the valve-seat plate 19.
However, the hose insert 9 does not completely fill the inside diameter of the hot-water inlet channel _ g _ 6 or cold-water inlet channel 7 or of the outlet chan-nel 8, since these channels have an air chamber 13 which is closed by means of a shoulder 12 on the hose insert . In the region of the air chamber 13, the hose inserts 9 are provided with bracing spikes 16 and/or bracing ribs 17, and these bracing spikes 16 and/or bracing ribs 17 can extend up to the wall of the air chamber 13 and are also arranged at least partly at a certain spacing therefrom, so that contact between the wall of the air chamber 13 and the bracing spikes 16 or bracing ribs 17 takes place only if the hose insert 9 is loaded with a certain pressure.
As may be seen from Figure 4, a sieve insert 14 can bff inserted, instead of the hose inserts 9, into the cold-water inlet channel 7 or analogously into the ,hot-water inlet channel 6 or the out,let channel 8.
In so doing, the sieve insert 14 has a sieve 18 which is shaped in the form of a cone and which is mounted on resilient supporting studs 15. m e supporting studs 15 are braced in the recess 25 of the channels 6, 7 and 8 and the apex of the sieve 18 is always directed against the direction of water flow.
It is important, here, that there remains between the sieve 18 and the recess 25 a free space 26 which is confined only by the resilient supporting studs 15 and which permits the passage of particles of dirt which have been carried along in the water and which slip over the sieve.
Figure 6 illustrates the noise-damping adapter . , ...
~15394~
5 as an integral part of the cartridge 3. A simpli-fied assembly of the fittings in the valve housing 19 with the same function being maintained, is thereby achieved.
Claims (8)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A noise-damped mixer valve, particularly a single-lever mixer, which comprises: a valve housing; a control cartridge inserted into the valve housing; said control car-tridge including a stationary valve-seat plate and at least one movable control plate arranged in face-to-face relation-ship with the stationary valve plate; a noise-damping adap-ter provided in the valve housing between a bottom part thereof and the stationary valve-seat plate; said noise-damping adapter having at least one hot-water inlet channel and one cold-water inlet channel, said inlet channels being provided with noise-damping fittings comprising resilient inserts at least partially surrounded by air chambers.
2. A noise-damped mixer valve according to claim 1, wherein said inserts comprise resilient hose inserts.
3. A noise-damped mixer valve according to claim 2, wherein the hose insert is of elastomeric material.
4. A noise-damped mixer valve according to claim 2, wherein the hose insert has sealing end faces.
5. A noise-damped mixer valve according to claim 4, wherein the end faces are sealing rings.
6. A noise-damped mixer valve according to claim 2, wherein the hose insert has a shoulder which seals an air chamber.
7. A noise-damped mixer valve according to claim 2, wherein the hose insert has bracing elements.
8. A noise-damped mixer valve according to claim 7, in which the bracing elements are spikes or ribs.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368316A CA1153947A (en) | 1981-01-12 | 1981-01-12 | Noise-damped mixer valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA000368316A CA1153947A (en) | 1981-01-12 | 1981-01-12 | Noise-damped mixer valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1153947A true CA1153947A (en) | 1983-09-20 |
Family
ID=4118893
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368316A Expired CA1153947A (en) | 1981-01-12 | 1981-01-12 | Noise-damped mixer valve |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1153947A (en) |
-
1981
- 1981-01-12 CA CA000368316A patent/CA1153947A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |