CN101576189A - Universal connecting pipe fitting - Google Patents
Universal connecting pipe fitting Download PDFInfo
- Publication number
- CN101576189A CN101576189A CNA2009100399985A CN200910039998A CN101576189A CN 101576189 A CN101576189 A CN 101576189A CN A2009100399985 A CNA2009100399985 A CN A2009100399985A CN 200910039998 A CN200910039998 A CN 200910039998A CN 101576189 A CN101576189 A CN 101576189A
- Authority
- CN
- China
- Prior art keywords
- pipe fitting
- universal connecting
- connecting pipe
- pipe
- pipelines
- 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.)
- Granted
Links
- 230000000694 effects Effects 0.000 claims abstract description 12
- 238000007789 sealing Methods 0.000 claims abstract description 10
- 238000006073 displacement reaction Methods 0.000 claims abstract description 5
- 239000002184 metal Substances 0.000 claims abstract description 4
- 229920001971 elastomer Polymers 0.000 claims description 13
- 239000005060 rubber Substances 0.000 claims description 13
- 230000008878 coupling Effects 0.000 claims description 12
- 238000010168 coupling process Methods 0.000 claims description 12
- 238000005859 coupling reaction Methods 0.000 claims description 12
- 230000006835 compression Effects 0.000 claims description 9
- 238000007906 compression Methods 0.000 claims description 9
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 239000003292 glue Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 claims description 5
- 230000003321 amplification Effects 0.000 claims description 3
- 230000009977 dual effect Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000005096 rolling process Methods 0.000 claims description 2
- 230000035882 stress Effects 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000005493 welding type Methods 0.000 description 2
- 240000000233 Melia azedarach Species 0.000 description 1
- 239000011230 binding agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 210000001503 joint Anatomy 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Branch Pipes, Bends, And The Like (AREA)
Abstract
The invention relates to a universal connecting pipe fitting. When the universal connecting pipe fitting is used for fixed connections of pipelines, the anti-drawing force of an interface of the universal connecting pipe fitting is larger than the permissible tensile force of a pipe; when being used for flexible connections, the universal connecting pipe fitting can eliminate the working temperature stress of the pipelines through axial displacement of the pipe in the pipe fitting; when the universal connecting pipe fitting is used for port-burying connections of the pipelines, the touch-port dimensional tolerance of a port-burying pipe of the universal connecting pipe fitting can be larger; and when the universal connecting pipe fitting is used for general connections, the interface of the universal connecting pipe fitting can bear the tensile force generated by the pipelines when the working temperature difference is 35 DEG C; and simultaneously, because the universal connecting pipe fitting is demountable, the use is quite convenient. Because the universal connecting pipe fitting can finish the general, the fixed and the port-burying connections of the pipelines by adopting a general wrench, the application and the mounting operations are quite convenient. The sealing effects of connecting the pipelines with any specification pipe diameter and any pipe wall thickness in any severe working conditions by using the universal connecting pipe fitting are good, and the universal connecting pipe fitting effectively solves the problems that the prior conventional pipelines are troublesome to mount and the connection effect is poor, and is particularly applicable to thin wall metal pipes and important pipelines.
Description
Technical field
Patent of the present invention relates to a kind of tubing, particularly indoor water delivery, the tubing of gas transmission.
Background technique
Tap water, coal gas will just can be fed to the user by the conveying of pipeline, and pipe will just can be mounted to pipeline by connecting, the safe operation of the degree of reliability decision pipeline that pipe connects.
Present known pipeline is connected with threaded coupling connection (see figure 3), the clamp-press type interface connects (see figure 4) and is connected (see figure 5) with welding type.Though connecting, can dismantle threaded coupling, but the threaded coupling of pipe port is owing to be machine cut machine shaping, so machining screw was pretty troublesome when not only order was installed, and its pipe 14 can be because of the anticorrosive coat on threading 13 destroyed surfaces and the effective thickness of attenuate pipe, the machining screw groove can become stress concentration point again simultaneously, so the working life of its pipeline is shorter, not desirable Placement therefore.It mainly is to be applied in thin wall metal pipeline that the clamp-press type interface connects, it utilizes pipe fitting 15 chucking pipes 16, rely on the frictional force between them to prevent pulling of pipe, so its anti-slip power is very low, and its O-ring seal 17 is all to bear excessive compressing by whole circumference to come sealed interface, its cushion rubber can be because of excessively compressing accelerated ageing, follow the string, seepage appears easily, this kind connection simultaneously is owing to must use special-purpose pressure mouth instrument could install and can not dismantle, so it is loaded down with trivial details not only to construct, and be not suitable for being connected of middle large diameter pipeline and critical piping.Be connected firmly though be welded to connect, welding technique and construction environment require high, and difficulty of construction is very big, and especially during welded stainless steel pipe, owing to be difficult to carry out air protection in the pipeline, so welding quality is poorer, its weld seam can get rusty, and shortens the working life of pipeline.
Summary of the invention
The purpose of this invention is to provide a kind of easy for installation, novel pipeline connecting pipe fitting of being connected firmly, sealing the piping erection of reliable, as to be fit to various calibers, various pipe thicknesses pipeline and various bad working environments environment.
The catenation principle of universal connecting pipe fitting of the present invention is to utilize the O type O-ring seal that enters Seal cage with the lift-over form, the real glue that relies on cushion rubber is freely the rebounding pipe sealed of pressurized radially, the O-ring seal that has solved the connection of clamp-press type interface wears out owing to excessive pressurized can quicken cushion rubber, follow the string, occur leakage problems easily.By utilizing the pipe fitting that screws of spanner, what make shrink ring radially radially dwindles clamping tube, eliminates the radially loosening gap between pipe fitting and the pipe, thus guarantee the Seal cage circumferential clearance evenly, make sealing effect more reliable.When being used for fixing pipeline and connecting, utilize the sealing cushion rubber to make adhesive be full of gap between pipe fitting and the pipe, treat that it solidifies after, the pipeline tensile strength that makes connection interface not only reach being welded to connect interface, but also solve the quality problems that welding procedure exists.When active (temperature correction) pipeline connects, utilize pipe can in pipe fitting, do an amount of axial displacement and eliminate temperature difference stress, solve conventional pipelines and must could eliminate the loaded down with trivial details of temperature difference stress by reload temperature compensation pipe fitting.When being used for burying mouthful of pipeline and connecting, after utilizing pipe fitting all to pack into pipe, push back again and connect another root tube configurations, make two to bury mouthful pipe and bump mouthful distance bigger tolerance range can be arranged, solve traditional loose joint and buried tube length tolerance that mouthful pipe fitting requires interface seldom, could guarantee the problem of quality of connection.When being used for generally connecting, utilize the dual amplification power principle on screw thread and inclined-plane, the axial tensile force that the tension pull out force that makes its interface produces when 35 ℃ of work temperature difference greater than pipeline, simultaneously since this connection pipe need not process and just can connect and can dismantle, so installation is very easy.
Therefore, the present invention efficiently solves the drawback of the various Placements of conventional pipelines, makes the quality level of pipeline obtain the raising of a leap.
Description of drawings
Fig. 1, universal connecting pipe fitting are used for fixing pipeline and connect
1, pipe; 2, pipe fitting housing; 3, O type O-ring seal; 4, sealing cushion rubber; 5, plug screw; 6, shrink ring radially; 7, threaded coupling; 8, inclined working; 9, Seal cage; 10, adhesive layer; 11, interior cover
Fig. 2, universal connecting pipe fitting are used for activity (temperature correction) pipeline and connect
1, pipe; 2, pipe fitting housing; 3, O type O-ring seal; 4, sealing cushion rubber; 5, plug screw; 6, shrink ring radially; 7, threaded coupling; 8, inclined working; 9, Seal cage; 10, adhesive layer; 12, evagination annulus
Fig. 3, threaded coupling connect
13, outside thread; 14 threaded coupling pipes
Fig. 4, clamp-press type connect
15, clamp-press type pipe; 16, pipe; 17, seal ring;
Fig. 5, welding type connect
18, weld seam
Embodiment
1, universal connecting pipe fitting is used for fixing the pipeline connection
With plug screw 5, radially shrink ring 6, O type O-ring seal 3 are inserted on the pipe 1 to be connected successively, and O type O-ring seal 3 is placed the end of pipe 1, Bond is coated in pipe 1 and pipe fitting position to be connected, pipe 1 and plug screw 5 are all inserted and screw in pipe fitting housing 2 earlier after a little, again pipe 1 is advanced in the pipe fitting housing 2.At this moment O type O-ring seal 3 can enter in the Seal cage 9 with the form of lift-over, the radial dimension of the real glue of its cushion rubber is by the compression of pipe fitting inclined working 8, the compression ratio of real glue radial cross section that makes O type O-ring seal 3 is greater than 25%, thereby make interface have excellent sealing performance, adopt spanner to make plug screw 5 screw threaded coupling 7 again, at this moment radially shrink ring 6 meetings that have longitudinal opening are under the effect of the inclined working 8 of plug screw 5 and pipe fitting, produce necking deformation radially, thereby pipe 1 is clamped, eliminate the radially loosening gap between pipe fitting and the pipe, make the circumference of Seal cage 9 keep uniform gap.At this moment, because plug screw 5 screws in pipe fitting, its sealing cushion rubbers 4 that have been installed in circle in the plug screw 5 in advance can order be coated in adhesive on the pipe 1 and be filled in gap between plug screw 5 and the pipe, and be cured as adhesive layer 10, thereby pipe fitting and pipe are bonded together fully, make pipe from pipe fitting, not pull, finish the fixedly connected of pipeline like this.
2, universal connecting pipe fitting is used for pipeline and buries mouthful and to connect
With plug screw 5, radially shrink ring 6, O type O-ring seal 3 are inserted on tubulature successively, and O type O-ring seal 3 placed the end of pipe 1, again pipe fitting housing 2 is inserted in pipe fully.At this moment O type O-ring seal 3 can enter in the Seal cage 9 with the form of lift-over, plug screw 5 is screwed in fully the threaded coupling 7 interior (not revolving very tightly) of pipe fitting.When the pipe for the treatment of to bury mouthful is installed to bumping mouthful of tubulature, the other end accessory with pipe fitting: plug screw 5, radially shrink ring 6, O type O-ring seal 3 are inserted on the pipe to be connected successively, and O type O-ring seal 3 is placed the port of pipe, to pack into half length of the pipe fitting of tubulature more pushes back and is inserted on the pipe to be connected, and screw with the plug screw 3 of spanner with the pipe fitting both sides, at this moment radially shrink ring 6 can produce radially necking deformation under the effect of plug screw 5 and pipe fitting inclined working 8, thereby two tubes is all clamped, finish mouthful connection of burying of pipeline.
3, universal connecting pipe fitting is used for the connection of activity (temperature correction) pipeline
With plug screw 5, radially shrink ring 6, O type O-ring seal 3 are inserted on the pipe 1 to be connected successively, re-using special-purpose rolling tools forms the end roll extrusion of pipe to be installed and has dome ring 12, and O type O-ring seal 3 placed dome ring 12 next doors, the pipe fitting housing 2 of cover 11 in removing is packed into this pipe to be connected, treat again plug screw 5 suitably to be screwed (being as the criterion) after O RunddichtringO 3 enters Seal cage 9 firmly can stir pipe.Even at this moment the pipe work temperature difference of Lian Jieing is very big, also can in pipe fitting, does an amount of axial displacement, thereby eliminate the temperature difference stress that the pipeline work temperature difference produces, the pipeline of the very suitable conveying high temperature media of this connection by pipe.The activity of finishing pipeline like this connects.
4, universal connecting pipe fitting is used for general pipeline connection
With plug screw 5, radially shrink ring 6, O type O-ring seal 3 are inserted on the pipe 1 to be connected successively, and O type O-ring seal 3 placed the end of pipe 1, pipe 1 and plug screw 5 are all inserted and screw in pipe fitting housing 2 earlier after a little, again pipe 1 is advanced in the pipe fitting housing 2.At this moment O type O-ring seal 3 can enter in the Seal cage 9 with the form of lift-over, the radial dimension of the real glue of its cushion rubber is by the compression of pipe fitting inclined working 8, the compression ratio of real glue radial cross section that makes O type O-ring seal 3 is greater than 25%, thereby make interface have excellent sealing performance, adopt spanner to make plug screw 5 screw threaded coupling 7 again, at this moment radially shrink ring 6 meetings that have longitudinal opening are under the effect of the inclined working 8 of plug screw 5 and pipe fitting, produce necking deformation radially, thereby pipe 1 is clamped, eliminate the radially loosening gap between pipe fitting and the pipe, make the circumference of Seal cage 9 keep uniform gap.This connection since radially shrink ring 6 are dual amplification power principles of utilizing screw thread and inclined-plane, pipe is produced the very big power of radially holding tightly, the frictional force of its generation can be born the tensile force that pipeline produces 35 ℃ of work temperature difference.Finish the general connection of pipeline like this.
Above universal connecting pipe fitting can be pipe fittings such as butt joint, threeway, elbow and plug, and the body of this pipe fitting can be heavy wall or thin-wall pipe simultaneously, and the screw thread of the threaded coupling of pipe fitting can be machine cut moulding or roll forming.Because being the form with lift-over, the O type O-ring seal of this connection enters Seal cage, so can avoid traditional seal ring is to enter with pushing, thereby cause the cutting the limit of cushion rubber easily and leakage problems takes place, and this kind O-ring seal only bears compression radially in Seal cage, and do not bear axial compression, so the cushion rubber of having avoided clamp-press type to connect is subjected to whole excessive compressing, can accelerated ageing, follow the string and leakage problems takes place.Binder owing to this connection does not contact with the medium of pipe simultaneously, so can effectively guarantee the quality of pipe fed sheet of a media.When to connect some axial tensile forces be not very big general pipeline, because after screwing plug screw, its radially shrink-ring can produce the very big power that radially tightens, make pipe be not easy to pull, so can cancel adhesive layer, at this moment not only seal finely, but also can make things convenient for the dismounting of pipeline, make its application more convenient with the effect that is connected.As the pipeline that connects is the metal tube of thin-walled, its radially shrink-ring also can make pipe form a recessed annulus, make interface can bear bigger pulling capacity.
Claims (10)
1, a kind of universal connecting pipe fitting is by pipe, pipe fitting shell, O type O-ring seal, sealing cushion rubber, plug screw, inclined working, threaded coupling, radially shrink ring, Seal cage, adhesive layer, interior cover and dome ring are formed, it is characterized in that both can be used for the fixing of pipeline and generally being connected, can be used for mouthful connection of burying of pipeline again, the activity (temperature difference compensation) that also can be used for pipeline connects.
2, a kind of universal connecting pipe fitting according to claim 1 is characterized in that can eliminating the radially loosening gap between pipe fitting and the pipe after pipe fitting connects.
3, a kind of universal connecting pipe fitting according to claim 1, it is characterized in that when pipe fitting with after pipe is connected, form the uniform Seal cage of circumferential clearance between pipe and the pipe fitting, the radial dimension compression ratio of the real glue of its O type O-ring seal in this Seal cage is greater than 25%, and its cushion rubber does not bear axial compression.
4, a kind of universal connecting pipe fitting according to claim 1 is characterized in that O type O-ring seal is that mode with lift-over enters Seal cage, and the compression ratio of its radial dimension forms in rolling into the inclined working process.
5, a kind of universal connecting pipe fitting according to claim 1 is fixedly connected, and it is characterized in that has an adhesive layer between pipe fitting and the pipe, the medium contact in this adhesive layer discord pipe.
6, the activity of a kind of universal connecting pipe fitting according to claim 1 connects, and it is characterized in that pipe has certain axial displacement in pipe fitting.
7, the pipeline of a kind of universal connecting pipe fitting according to claim 1 buries a mouthful connection, it is characterized in that the pipe fitting shell can all pack into pipe, and its pipe fitting connects back pipe and pipe fitting can not be done axial displacement mutually.
8, a kind of universal connecting pipe fitting according to claim 1 general, bury and mouthful be connected with active, it is characterized in that pipe fitting is detachable.
9, the radially shrink ring of a kind of universal connecting pipe fitting according to claim 1 is characterized in that under the dual amplification power on screw thread and inclined-plane, and pipe is produced the very big power of holding tightly.
10, a kind of universal connecting pipe fitting according to claim 9 can produce the very big power of holding tightly to pipe, it is characterized in that making the thin wall metal pipe of connection to form a recessed annulus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100399985A CN101576189B (en) | 2009-06-04 | 2009-06-04 | Universal connecting pipe fitting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009100399985A CN101576189B (en) | 2009-06-04 | 2009-06-04 | Universal connecting pipe fitting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101576189A true CN101576189A (en) | 2009-11-11 |
| CN101576189B CN101576189B (en) | 2011-12-28 |
Family
ID=41271203
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2009100399985A Active CN101576189B (en) | 2009-06-04 | 2009-06-04 | Universal connecting pipe fitting |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN101576189B (en) |
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102620411A (en) * | 2012-04-19 | 2012-08-01 | 冯海涛 | Drinking water heating device with radiator |
| CN103109044A (en) * | 2010-03-26 | 2013-05-15 | 斯奈克玛 | Turbojet venting pipe, method for mounting one such pipe and turbojet provided with one such pipe |
| CN104712865A (en) * | 2015-03-30 | 2015-06-17 | 邝月好 | Expansion compensation connecting pipe fitting |
| CN107223190A (en) * | 2014-12-09 | 2017-09-29 | 费斯托股份有限两合公司 | Coupling arrangement for fluid circuit |
| CN108758120A (en) * | 2018-07-17 | 2018-11-06 | 赵建海 | A kind of connector that energy band water disassembles and installs hot melt aqueduct valve |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5025649B1 (en) * | 1970-12-05 | 1975-08-26 | ||
| AT328808B (en) * | 1972-10-26 | 1976-04-12 | Gritzka Waldemar | ELASTIC ROLLING RING |
| JPS5441124B2 (en) * | 1974-02-01 | 1979-12-06 | ||
| GB2047832B (en) * | 1979-04-27 | 1983-03-30 | Paragon Plastics Ltd | Compression joints |
| CN2348231Y (en) * | 1998-04-27 | 1999-11-10 | 沈吉铭 | Universal convenient joint for steel pipeline |
| AU2004324159A1 (en) * | 2004-10-13 | 2006-04-27 | Eaton Corporation | Low pressure fitting |
| DE102004052475A1 (en) * | 2004-10-28 | 2006-05-04 | Eaton Fluid Power Gmbh | Pull-resistant plug-in coupling |
-
2009
- 2009-06-04 CN CN2009100399985A patent/CN101576189B/en active Active
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103109044A (en) * | 2010-03-26 | 2013-05-15 | 斯奈克玛 | Turbojet venting pipe, method for mounting one such pipe and turbojet provided with one such pipe |
| CN103109044B (en) * | 2010-03-26 | 2016-02-24 | 斯奈克玛 | Turbine jet engine ventilation duct, the method for this ventilation duct is installed and is provided with the turbine jet engine of this ventilation duct |
| CN102620411A (en) * | 2012-04-19 | 2012-08-01 | 冯海涛 | Drinking water heating device with radiator |
| CN102620411B (en) * | 2012-04-19 | 2015-11-25 | 佛山市四季茶香茶具有限公司 | A kind of drinking water heating device with radiator |
| CN107223190A (en) * | 2014-12-09 | 2017-09-29 | 费斯托股份有限两合公司 | Coupling arrangement for fluid circuit |
| CN107223190B (en) * | 2014-12-09 | 2019-02-22 | 费斯托股份有限两合公司 | Couplings for Fluid Lines |
| CN104712865A (en) * | 2015-03-30 | 2015-06-17 | 邝月好 | Expansion compensation connecting pipe fitting |
| CN108758120A (en) * | 2018-07-17 | 2018-11-06 | 赵建海 | A kind of connector that energy band water disassembles and installs hot melt aqueduct valve |
Also Published As
| Publication number | Publication date |
|---|---|
| CN101576189B (en) | 2011-12-28 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| ASS | Succession or assignment of patent right |
Owner name: GUANGZHOU LIFENG PIPELINE TECHNOLOGY CO., LTD. Free format text: FORMER OWNER: CHENG YUTING Effective date: 20100907 |
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| C41 | Transfer of patent application or patent right or utility model | ||
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Free format text: CORRECT: ADDRESS; FROM: 510370 603, NO.216, HUADI AVENUE, FANGCUN VILLAGE, GUANGZHOU CITY, GUANGDONG PROVINCE TO: 511442 NO.28, NANYUAN ROAD, KENGTOU VILLAGE, NANCUN TOWN, FANYU DISTRICT, GUANGZHOU CITY, GUANGDONG PROVINCE |
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| TA01 | Transfer of patent application right |
Effective date of registration: 20100907 Address after: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District pit village south road No. 28 Applicant after: Guangzhou Lifeng Pipe Technology Co., Ltd. Address before: 510370 No. 216, flower garden avenue, Guangzhou, Guangdong, Fangcun 603 Applicant before: Cheng Yuting |
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| C14 | Grant of patent or utility model | ||
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Owner name: GUANGDONG LIFENG PIPELINE TECHNOLOGY CO., LTD. Free format text: FORMER NAME: GUANGZHOU LIFENG PIPELINE TECHNOLOGY CO., LTD. |
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| CP01 | Change in the name or title of a patent holder |
Address after: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District pit village south road No. 28 Patentee after: Guangdong Lifeng Pipeline Technology Co., Ltd. Address before: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District pit village south road No. 28 Patentee before: Guangzhou Lifeng Pipe Technology Co., Ltd. |
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| TR01 | Transfer of patent right | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20170607 Address after: 510925 Guangdong Guangzhou Conghua District Jiang Po Street No. 36 Cunjiao Luo Tan Patentee after: Guangzhou Baojie stainless steel pipe industry Co. Ltd. Address before: 511442 Guangdong Province, Guangzhou City Southern towns Panyu District pit village south road No. 28 Patentee before: Guangdong Lifeng Pipeline Technology Co., Ltd. |