CN106015569A - Static conical surface sealing structure - Google Patents
Static conical surface sealing structure Download PDFInfo
- Publication number
- CN106015569A CN106015569A CN201610532738.1A CN201610532738A CN106015569A CN 106015569 A CN106015569 A CN 106015569A CN 201610532738 A CN201610532738 A CN 201610532738A CN 106015569 A CN106015569 A CN 106015569A
- Authority
- CN
- China
- Prior art keywords
- sealing member
- conical surface
- end cap
- cylinder barrel
- 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.)
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Classifications
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- 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
- F16J15/104—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing characterised by structure
Abstract
The invention provides a static conical surface sealing structure. The static conical surface sealing structure comprises a cylinder barrel (1), an end cover (2) and a sealing component (3). The cylinder barrel (1) is movably connected with the end cover (2), and an inner end surface (31) and an outer conical surface (33) are formed on the sealing component (3). An inner conical surface (12) is formed at one end of the cylinder barrel (1). The sealing component (3) is defined between the cylinder barrel (1) and the end cover (2), the inner end surface (31) of the sealing component (3) is matched with the end cover (2) to form a planar sealing structure, and the outer conical surface (33) of the sealing component (3) is matched with the inner conical surface (12) of the cylinder barrel (1) to form a conical surface sealing structure. The two sealing structures are formed between the cylinder barrel and the end cover, and when the end cover is dismounted and mounted, the sealing component cannot make contact with the connecting portion of the cylinder barrel and the end cover, so that sealing reliability between the cylinder barrel and the end cover is guaranteed, the problem that the sealing component is extruded out and deformed is solved, and the risk that the sealing component is damaged in the dismounting and mounting process of the end cover is completely eradicated.
Description
Technical field
The present invention relates to cylinder barrel and end cap seal interconnection technique field, be especially for cylinder barrel and be connected with end cap seal
A kind of static conical surface sealing structure.
Background technology
Cylinder barrel and end cap seal attachment structure have application, for example, it is desired to often dismantle end cap on a lot of fluid kind equipments
Grease gun series products.For grease gun series products, it in use, after oils and fats exhausts, needs to beat
Open the end cap being tightly connected with cylinder barrel to carry out filler operation.Sealing between existing, common cylinder barrel and end cap is even
Access node structure uses screw thread screw-fashion to seal, i.e. the connecting portion at cylinder barrel, end cap is machined with in pairing respectively,
External screw thread, is machined with groove on cylinder barrel angle head cylindrical week, to accommodate the sealing members such as rubber-like sealing ring, described end cap
Center is also machined with NPT screw thread, as the interface externally connected；During cylinder barrel and end cap mutually screw, hold
Sealing member is extruded by continuous ground, forces sealing member to deform, thus realizes being tightly connected between cylinder barrel and end cap.
Hermetical connecting structure between above-mentioned cylinder barrel and end cap, its in the course of the work, if the pressure within cylinder barrel
Higher, high pressure will force sealing member outwardly against, its partial rubber material can be squeezed between cylinder barrel and end cap
In gap between screw, and after the hypotension in cylinder barrel or cancelling, this partial rubber that sealing member was originally extruded
Material can not restore completely.Therefore, this cylinder barrel the most at least has following defects that with end cap seal attachment structure
One, in the operating process being repeatedly opened end cap and screw end cap, the cusp that spire is sharp-pointed can gnaw sealing
Part, is easily caused sealing member impaired, thus has influence on the sealing effectiveness between cylinder barrel and end cap；If sealing member is subject to
Major injury, it is impossible to reuse.
Its two, even if lucky sealing member does not damage, but after opening end cap, sealing member is easily taken out of by end cap adhesion,
Then, in end cap moving process, sealing member the most easily drops to ground.Owing to speckling with oils and fats on sealing member so that it is hold
Easily it is infected with the impurity such as silt, and is difficult to clean out, thus bring pollution and the source of trouble to cylinder system；If it is close
Sealing rolls down to, in the narrow ditch seam that on-the-spot peripheral equipment is formed, be difficult to the most again take, thus bring to subsequent job
Trouble is even interrupted.
Summary of the invention
The technical problem to be solved in the present invention is: the problem existed for prior art, it is provided that a kind of static conical surface seal
Structure, improves the sealing reliability between cylinder barrel and end cap, and effectively prevents sealing member therein at end cap disassembling operations
In be damaged.
The technical problem to be solved in the present invention realizes by the following technical solutions: a kind of static conical surface sealing structure, bag
Including cylinder barrel, end cap and sealing member, described cylinder barrel is flexibly connected with end cap, described sealing member is formed respectively inner face,
Outer conicoid, described cylinder barrel one end forms interior conicoid；Described sealing member is limited between cylinder barrel and end cap, and seals
Part cooperatively forms plane sealing structure by inner face and end cap, and is joined with the interior conicoid on cylinder barrel by outer conicoid
Close and form conical surface sealing structure.
Preferably, also including lacing film, described lacing film gear is connected fixing outside sealing member and with end cap, at sealing member and
Gap of stepping down is formed between lacing film.
Preferably, described end cap is arranged and steps down inclined-plane, by stepping down inclined-plane and shape between described sealing member and lacing film
Become gap of stepping down.
Preferably, described lacing film side arranges boss of stepping down, by stepping down boss between described sealing member and lacing film
Formation is stepped down gap.
Preferably, described outer conicoid is straight burr cone structure.
Preferably, described outer conicoid is the curved-surface structure outwards heaved.
Preferably, the tail end of described sealing member forms elastic dilatation portion, described elastic dilatation portion and seal body portion it
Between formed groove.
Preferably, the excircle of described cylinder barrel being threaded connecting portion, described end cap forms screw thread with threaded joints
It is flexibly connected.
Preferably, described sealing member uses hardness semi-hard material between rubber and metal to make.
Preferably, the semi-hard material that described sealing member is used is tetrafluoro, or nylon, or polyether-ether-ketone.
Compared with prior art, the invention has the beneficial effects as follows: owing to forming flat seal between sealing member and end cap
Structure, meanwhile, forms conical surface sealing structure, so that formed between cylinder barrel and end cap between sealing member and cylinder barrel
Two seals structure, both by increasing cylinder barrel wall thickness or need not increase end flange structure offering for accommodating O
The sealed groove of RunddichtringO, it is not required that end cap is applied strength and could realize the sealing between cylinder barrel and end cap, more
There is not sealing member and be extruded the problem of deformation under inner cavity of cylinder high pressure, therefore, the present invention can ensure cylinder well
Sealing reliability between cylinder and end cap, end cap size inadequate at cylinder barrel wall thickness can not accommodate O RunddichtringO and back-up ring
In the case of, especially practical；Further, in end cap disassembling operations, sealing member therein all will not touch cylinder barrel with
The connecting portion of end cap, therefore, even if repeatedly dismantling end cap, sealing member therein is also not easy to damage, thus effectively
Prevent sealing member to be damaged in the repeated disassembled and assembled of end cap operates, advantageously ensure that between cylinder barrel and end cap is close
Envelope reliability.By using lacing film gear outside sealing member and being connected with end cap fixing, therefore, at end cap disassembling operations
In, due to the stop of lacing film, it can be ensured that sealing member does not falls out on the ground, thus efficiently avoid sealing member because of
It is infected with the impurity such as silt and is difficult to clean out caused pollution and potential safety hazard.
Accompanying drawing explanation
Fig. 1 is the structural map of a kind of static conical surface sealing structure of the present invention.
Fig. 2 is that the A-A in Fig. 1 is to sectional view.
Fig. 3 is the partial enlarged drawing (make 1 in gap of stepping down) in Fig. 2 at B.
Fig. 4 is the partial enlarged drawing (make 2 in gap of stepping down) in Fig. 2 at B.
Fig. 5 is the structure chart of the lacing film in Fig. 4.
Fig. 6 is that the C-C in Fig. 5 is to sectional view.
Fig. 7 is the structure chart of the cylinder barrel in Fig. 1.
Fig. 8 is the structure chart of the sealing member in Fig. 1.
Fig. 9 is the partial enlarged drawing (outer conicoid is the straight burr conical surface) in Fig. 8 at D.
Figure 10 is the partial enlarged drawing (outer conicoid is the curved surface outwards heaved) in Fig. 8 at D.
Labelling in figure: 1-cylinder barrel, 2-end cap, 3-sealing member, 4-lacing film, 5-pressure interface, 6-steps down gap, 7-
Attachment screw, 11-threaded joints, conicoid in 12-, 21-steps down inclined-plane, 31-inner face, 32-elastic dilatation portion,
The outer conicoid of 33-, 34-groove, 35-installs through hole, 41-pilot hole, 42-pressure through hole, and 43-steps down boss.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearer, below in conjunction with the accompanying drawings and be embodied as
The present invention is described in detail for example.Should be appreciated that specific embodiment described herein only in order to explain the present invention,
It is not intended to limit the present invention.
Embodiment 1
Static conical surface sealing structure as shown in Figure 1 and Figure 2, mainly includes cylinder barrel 1, end cap 2 and sealing member 3, institute
Stating end cap 2 to take the shape of the letter U structure, its inner chamber forms boss and rabbet groove, offers at boss position and runs through the pressure of boss and connect
Mouth 5.The structure of described cylinder barrel 1 is as it is shown in fig. 7, form interior conicoid 12 in cylinder barrel 1 one end, outside cylinder barrel 1
Threaded joints 11 provided circumferentially about, described end cap 2 and threaded joints 11 are by the internal and external screw thread mutually screwed
And form screw thread and be flexibly connected.The structure of described sealing member 3 as shown in Figure 8, Figure 9, its main part is respectively provided with
Inner face 31, outer conicoid 33 and installation through hole 35, described outer conicoid 33 is straight burr cone structure.Described sealing
Part 3 is mutually socketed by the boss of installation through hole 35 thereon with end cap 2 inner chamber, between described cylinder barrel 1 and end cap 2
By mutually screwing operation, sealing member 3 is clamped between end cap 2 and cylinder barrel 1, on described sealing member 3
Inner face 31 is positioned in the rabbet groove of end cap 2 inner chamber, so that forming snap-in structure between sealing member 3 and end cap 2,
Be conducive to the installation location between sealing member 3 and end cap 2, and sealing member 3 is by inner face 31 and end cap 2 inner chamber
Rabbet groove matches and forms plane sealing structure, meanwhile, by outer conicoid 33 and the interior conicoid on cylinder barrel 1
12 match and form conical surface sealing structure.Therefore, two seals knot it is the formation of between described cylinder barrel 1 and end cap 2
Structure, such that it is able to the sealing reliability ensured well between cylinder barrel 1 and end cap 2；It is additionally, since at end cap 2
In disassembling operations, described sealing member 3 all will not touch the connecting portion between cylinder barrel 1 and end cap 2, therefore, i.e.
Making repeatedly to dismantle end cap 2, sealing member 3 therein also will not be had an effect with the screw thread on end cap 2 and impaired, less
There is sealing member 3 under cylinder barrel 1 inner chamber high pressure, be extruded the problem of deformation, thus effectively prevent sealing member 3 and exist
The repeated disassembled and assembled operation of end cap 2 is damaged.
Screw in rundown process at cylinder barrel 1 and end cap 2, be inevitably present uneven, unsteady phenomena, from
And make the conical surface seal between sealing member 3 with cylinder barrel 1 coordinate unavoidable generation the most concentric, add interior conicoid
12, the making tolerance of outer conicoid 33, for conventional straight burr cone match, the position of both linear contact lay is not the most one
Complete cycle circular contact, but localized contact, so easily cause seal failure.To this end, as shown in Figure 10, described close
Outer conicoid 33 on sealing 3 can also be designed to the curved-surface structure outwards heaved, after using the design of this structure, just
Can guarantee that between interior conicoid 12 and outer conicoid 33 cylinder barrel 1 and end cap 2 screw in rundown process formed one complete
Whole circumferential line contact, so that it is guaranteed that the sealing reliability of conical surface sealing structure that sealing member 3 and cylinder barrel 1 are formed.
Especially, described sealing member 3 preferably selects hardness semi-hard material between rubber and metal to make, such as,
The semi-hard material such as tetrafluoro, nylon, polyether-ether-ketone, so screw in rundown process at cylinder barrel 1 and end cap 2, sealing member
3 also will not be destroyed after suitably being extruded, and a little compression simply occurs, so that aforesaid inner cone
Circumferential line contact between shape face 12 with outer conicoid 33 becomes face and contacts, thus is conducive to strengthening sealing member 3 and cylinder
Sealing reliability between cylinder 1.
Further, as shown in Fig. 8, Fig. 9, Figure 10, it is formed with elastic dilatation portion 32, institute at sealing member 3 tail end
Stating elastic dilatation portion 32 can be the thin-wall construction formed by offering deep gouge at sealing member 3 main part, and its wall thickness leads to
It is often less than the 1% of matched cylinder barrel 1 internal diameter, thus makes elastic dilatation portion 32 and sealing member 3 main part
Between formed groove 34.When cylinder barrel 1 inner chamber exists pressure medium, such as during hydraulic oil, described elastic dilatation portion 32
Under the pressure effect that pressure medium produces, it can produce the elastic deformation amount expanded outward, therefore so that elastic expansion
Opening outer wall thin seam of annular together with being formed between the inwall of cylinder barrel 1 in portion 32, this thin sewer has expenditure and pressure effect,
Such that it is able to reduce the pressure medium pressure to the conical surface sealing structure that aforesaid sealing member 3 is formed with cylinder barrel 1, make
Sealing property between sealing member 3 and cylinder barrel 1 is relatively reliable.It addition, tightened cylinder barrel 1 and screwing of end cap 2
Cheng Zhong, is arranged on the elastic dilatation portion 32 of sealing member 3 front end after stretching into cylinder barrel 1 inner chamber, additionally aids sealing member 3
And realize centering reliably between cylinder barrel 1, thus ensure that sealing member 3 will not screw instability because of cylinder barrel 1 and end cap 2
Or rock and produce crooked or eccentric.
Embodiment 2
Compared with the static conical surface sealing structure shown in embodiment 1, also include that lacing film 4, described lacing film 4 keep off
Outside sealing member 3.The structure of described lacing film 4 as shown in Figure 5, Figure 6, for disc-shaped structure, it offers assembling
Hole 41 and pressure through hole 42, be allowed to through pilot hole 41 by attachment screw 7 between described lacing film 4 and end cap 2
Connecting fixing, the external diameter of described lacing film 4 is bigger than installation through hole 35 internal diameter on sealing member 3, in order to lacing film 4 is permissible
Keep off well outside sealing member 3.Therefore, it can so that keeping overall structure between sealing member 3 and end cap 2, i.e.
Making when repeated disassembled and assembled end cap 2, sealing member 3 also will not occur mutually to come off with end cap 2, therefore, even if opening
After end cap 2, sealing member 3 also not readily disengages from end cap 2 and ground of dropping, thus decreases sealing member 3 because of contamination mud
The impurity such as husky and be difficult to clean out caused pollution and potential safety hazard.
But, if sealing member 3 is contacted by lacing film 4 and compresses, then, as long as between sealing member 3 and cylinder barrel 1
Somewhat eccentric, the automatic guiding of sealing member 3 cannot be realized, consequently, it is possible to cause sealing member 3 and cylinder barrel 1 it
Between seal failure.To this end, as in figure 2 it is shown, gap 6 of stepping down can be arranged between sealing member 3 and lacing film 4,
Meanwhile, make sealing member 3 by between installation through hole 35 thereon and the boss of end cap 2 inner chamber with gap fiting mode phase
Socket mutually, in order to can relative flexible rotating between sealing member 3 with end cap 2.Described step down gap 6 can be so
Mode build, step down inclined-plane 21, between described sealing member 3 and lacing film 4 as it is shown on figure 3, arrange on end cap 2
Gap 6 of stepping down is formed by stepping down inclined-plane 21.It addition, described step down gap 6 it is also possible that mode build,
As shown in Figure 5, Figure 6, boss 43 of stepping down is set in lacing film 4 side, passes through between described sealing member 3 and lacing film 4
Step down boss 43 and form gap 6 of stepping down, as shown in Figure 4.Stepped down gap 6 by setting, it is ensured that sealing member
3 will not be compressed by lacing film 4, and make sealing member 3 have fraction of to move axially space；Stepped down boss 43 by setting,
The bonding strength of lacing film 4 can also be increased.Therefore, screwing in rundown process, even if depositing at cylinder barrel 1 and end cap 2
Screwing tighten uneven or uneven, it is also possible to realize the automatic aligning of sealing member 3, automatic centering, thus
Sealing member 3 is played certain correcting effect.The outer circumference surface of end cap 2 can also arrange anti-skid structure, this end
Covering the anti-skid structure on 2 outer circumference surfaces can be directly to carry out annular knurl process on its outer circumference surface and formed, it is also possible to
It is some convex closures to be set on its outer circumference surface and is formed, by arranging anti-skid structure, can facilitate and end cap 2 is carried out
Free-hand tighten, and more laborsaving.
The foregoing is only presently preferred embodiments of the present invention, not in order to limit the present invention, it is noted that
All any amendment, equivalent and improvement etc. made within the spirit and principles in the present invention, should be included in this
Within bright protection domain.
Claims (10)
1. a static conical surface sealing structure, including cylinder barrel (1), end cap (2) and sealing member (3), described cylinder barrel
(1) be flexibly connected with end cap (2), it is characterised in that: formed respectively on described sealing member (3) inner face (31),
Outer conicoid (33), described cylinder barrel (1) one end forms interior conicoid (12)；Described sealing member (3) is limited to cylinder
Between cylinder (1) and end cap (2), and sealing member (3) cooperatively forms flat by inner face (31) with end cap (2)
Surface seal structure, and it is close to cooperatively form the conical surface by outer conicoid (33) and the interior conicoid (12) on cylinder barrel (1)
Seal structure.
A kind of static conical surface sealing structure the most according to claim 1, it is characterised in that: also include lacing film (4),
Described lacing film (4) gear is in sealing member (3) outside and is connected fixing, at sealing member (3) and lacing film with end cap (2)
(4) gap (6) of stepping down is formed between.
A kind of static conical surface sealing structure the most according to claim 2, it is characterised in that: described end cap (2)
Upper setting is stepped down inclined-plane (21), is formed by inclined-plane of stepping down (21) between described sealing member (3) and lacing film (4)
Step down gap (6).
A kind of static conical surface sealing structure the most according to claim 2, it is characterised in that: described lacing film (4)
Side arranges and steps down boss (43), between described sealing member (3) and lacing film (4) by boss of stepping down (43) shape
Become gap (6) of stepping down.
5. according to a kind of static conical surface sealing structure described in any one of claim 1-4, it is characterised in that: described
Outer conicoid (33) is straight burr cone structure.
6. according to a kind of static conical surface sealing structure described in any one of claim 1-4, it is characterised in that: described
Outer conicoid (33) is the curved-surface structure outwards heaved.
7. according to a kind of static conical surface sealing structure described in any one of claim 1-4, it is characterised in that: described close
The tail end of sealing (3) forms elastic dilatation portion (32), described elastic dilatation portion (32) and sealing member (3) main part
Between formed groove (34).
8. according to a kind of static conical surface sealing structure described in any one of claim 1-4, it is characterised in that: described cylinder
Being threaded connecting portion (11) on the excircle of cylinder (1), described end cap (2) forms spiral shell with threaded joints (11)
Stricture of vagina is flexibly connected.
9. according to a kind of static conical surface sealing structure described in any one of claim 1-4, it is characterised in that: described
Sealing member (3) uses hardness semi-hard material between rubber and metal to make.
A kind of static conical surface sealing structure the most according to claim 9, it is characterised in that: described sealing member (3)
The semi-hard material used is tetrafluoro, or nylon, or polyether-ether-ketone.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532738.1A CN106015569B (en) | 2016-07-07 | 2016-07-07 | A kind of static conical surface sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610532738.1A CN106015569B (en) | 2016-07-07 | 2016-07-07 | A kind of static conical surface sealing structure |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106015569A true CN106015569A (en) | 2016-10-12 |
| CN106015569B CN106015569B (en) | 2018-02-09 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610532738.1A Active CN106015569B (en) | 2016-07-07 | 2016-07-07 | A kind of static conical surface sealing structure |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3211274A1 (en) * | 1981-03-26 | 1982-10-21 | William Lewis 48174 Romulus Mich. Sheppard | Lubricating device for a seal |
| CN101476623A (en) * | 2009-01-22 | 2009-07-08 | 丹佛斯（天津）有限公司 | Sealing device and valve |
| CN202249886U (en) * | 2011-07-15 | 2012-05-30 | 中国石油天然气股份有限公司 | Self-lubricating wellhead sealer |
| CN102518926A (en) * | 2011-12-14 | 2012-06-27 | 河南科技大学 | Electric greasing device capable of controlling grease quantity |
| CN204153161U (en) * | 2014-10-16 | 2015-02-11 | 开封瑞科阀门有限公司 | The seal arrangement of dark bar ultralow temperature stop valve |
| CN104653998A (en) * | 2015-01-26 | 2015-05-27 | 北京南车时代机车车辆机械有限公司 | Unblocking device for grease nipple |
-
2016
- 2016-07-07 CN CN201610532738.1A patent/CN106015569B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3211274A1 (en) * | 1981-03-26 | 1982-10-21 | William Lewis 48174 Romulus Mich. Sheppard | Lubricating device for a seal |
| CN101476623A (en) * | 2009-01-22 | 2009-07-08 | 丹佛斯（天津）有限公司 | Sealing device and valve |
| CN202249886U (en) * | 2011-07-15 | 2012-05-30 | 中国石油天然气股份有限公司 | Self-lubricating wellhead sealer |
| CN102518926A (en) * | 2011-12-14 | 2012-06-27 | 河南科技大学 | Electric greasing device capable of controlling grease quantity |
| CN204153161U (en) * | 2014-10-16 | 2015-02-11 | 开封瑞科阀门有限公司 | The seal arrangement of dark bar ultralow temperature stop valve |
| CN104653998A (en) * | 2015-01-26 | 2015-05-27 | 北京南车时代机车车辆机械有限公司 | Unblocking device for grease nipple |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106015569B (en) | 2018-02-09 |
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Address after: 610207 Chengdu China (Sichuan) Free Trade Pilot Zone, Chengdu Shuangliu District, Sichuan Province Patentee after: Chengdu Zhonghuan Flow Control Equipment Co., Ltd. Address before: 610207, No. two, section two, airport road 1488, Southwest Airlines Development Zone, Chengdu, Sichuan, Shuangliu County Patentee before: Chengdu Zhonghuan Flow Control Equipment Co., Ltd. |
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Effective date of registration: 20200703 Address after: 610207 Chengdu China (Sichuan) Free Trade Pilot Zone, Chengdu Shuangliu District, Sichuan Province Co-patentee after: PETROCHINA WEST PIPELINE Co. Patentee after: CHENGDU ZHONGHUAN FLOW CONTROLS MFG. Co.,Ltd. Address before: 610207 Chengdu China (Sichuan) Free Trade Pilot Zone, Chengdu Shuangliu District, Sichuan Province Patentee before: CHENGDU ZHONGHUAN FLOW CONTROLS MFG. Co.,Ltd. |
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