CN1145463A - Zuoshi full-metal ball valve, V-shape metal tube joint - Google Patents
Zuoshi full-metal ball valve, V-shape metal tube joint Download PDFInfo
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- CN1145463A CN1145463A CN 95119317 CN95119317A CN1145463A CN 1145463 A CN1145463 A CN 1145463A CN 95119317 CN95119317 CN 95119317 CN 95119317 A CN95119317 A CN 95119317A CN 1145463 A CN1145463 A CN 1145463A
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Abstract
A Zuo's full-metal ball valve and a V-shaped full-metal tube joint based on universal sealing mechanism feature that the "line contact" positions between members of product are designed into "narrow face contact" to realize "self sealing". The "line contact "positions all change into round corner with radius of 0.5-1mm and the circumference trace shoulding be in a same plane. It may be used for high-tmp, high-pressure and strong-corrosion pipeline.
Description
Ball valve is a kind of in the series of valves product, belongs to the fluid engineering technical field of sealing technology.Existing ball valve is made up of members such as valve pivot, valve seat, ball sealer, plasticity seal element, valve rod, valve handle, pipe joint, screw thread or flange bolt fastening pieces, mainly plays the effect of lock stream.
Valve does not allow any leakage phenomenon and takes place, and the function of seal element is to stop leakage.Might leak part so valve is all: as between the sealing surface of coupling and with the positions such as junction point of member, all must seal.
So sealing is the key of valve (comprising ball valve) performance quality.
Sealing medium usually leaks into opposite side with forms such as leakage, infiltration, diffusions from a side of container sealing part under concentration difference and action of pressure.Have or not and leak and the size of amount, need see between the sealing surface and and container between junction point have or not the gap and decide.
The gap the size and have or not? mainly because of the size of sealed medium pressure in sealing principle, structure, selection, machining accuracy, assembling quality and the using process, the difference of factors such as the height of temperature, Sealing burn into abrasion situation and difference.
For reducing or eliminating its seal clearance, normally realize with sealing force!
To so far, with regard to domestic and international contact seal type, its seal element reaches more than 25 kinds, but this class seal element has following common features:
1, domestic and international existing seal element is all selected plastic material basically for use: as rubber, asbestos, graphite, nylon, teflon, nitrile butadiene rubber, silicon carbide, polyimide ... Deng.
As the polyimide piston ring, be 300,000 tons of synthetic amine that China designs voluntarily, produces, the oil-free lubrication CQ2 compressor of using in 240,000 tons of urea production equipments, N50/200 type high pressure section, level V cylinder piston ring, but only can 148 ℃ of heatproofs, the maximum sealing load of individual pen is less than 200Kg/cm
2
2, except that sword limit type, bellows-type seal element, domestic and international existing sealing contact be the face contact, and area of contact is big.
For this reason, if select metallic material for use, certainly will cause following disadvantage:
(1) surface of contact between the Sealing only is processed into the fully-flattened and could eliminates its gap, and this just causes the processing technology difficulty very big;
(2) metal strength is big, if area of contact is big, desires to make it to deform and eliminates the gap, just must apply great sealing force.As 100 square millimeters of area of contact, to apply more than ten ton sealing force at least, the distortion in gap could take place to eliminate.Because every square millimeter of pressure that can bear of ferrous metal is nearly all more than 100 kilograms.Desire to apply big like this sealing force, in fact extremely difficulty is accomplished;
(3) sealing force is big, frictional resistance is big, opens and closes difficulty.
For avoiding above-mentioned disadvantage, the inside and outside existing seal element in native land is nearly all selected plastic material for use, but has also therefore caused many defectives; Lack in complexity, working life as hard to bear high pressure-temperature and deep-etching, structure ... Deng.
Pipe joint divides two classes substantially: a class be affixed, promptly can not take apart again after connecting, generally use less: another kind of is loose joint, can take apart after promptly connecting again, and is widely used.
Two kinds of the commonly used branches again of loose joint: a kind of is that caliber is less, connects with internal thread, and it is extrusion type sealed that its sealing adopts plasticity seal washer to do, or wraps up in pipe thread with living plastic film and seal; Another kind of caliber is bigger, adopts the plasticity seal washer, and flange, bolton connect.Be characterized in: all be difficult to bear high pressure, high temperature and deep-etching.
Reference
Gu Yongquan: " fluid motive sealing " goes up volume two: publishing house of CNPC, 1992;
" the 23rd piece of mechanical industry handbook, sealing; China Machine Press, 1980;
" valve products model " China Machine Press, 1985.
Goal of the invention of the present invention is: the multiple seal element that new omnipotent sealing mechanism is subordinate to, it is more extensive at first to apply in the series of valves product purposes, and have on the ball valve and pipe joint of high pressure requirement, make it become a kind of brand-new high pressure resistant (1500 more than the barometric pressure), high temperature resistant (more than 550 ℃) and be able to bear strong corrosion, safe and reliable, the life-span long, simple in structure, easy to process, cheap full-metallic ball valve series product and all metal tube joint series product that match with it.
Omnipotent sealing mechanism and the practical application thereof more than addressed are from start to finish all based on " circle "! Because " circle " possesses many characteristics that are very beneficial for sealing: one, at grade, all are the track of the moving point of a constant to a fixed point distance, are many concentric circles that wait radius.So all corresponding point of contact on track and the track all overlap and none gap one by one; Two, structurally, justifying variable tension is pressurized (the material compression capability is the several times, tens of times and even hundred times of its tension ability); When three, the plane shape girth equates, area of a circle maximum; When the body volume equates, the surface area minimum of ball: ... Deng.
Based on all thinkings, thereby form two total unusual designs, further founded an omnipotent rather widely sealing mechanism of purposes " circle ".And take this to develop multiple seal element.
What is meant by omnipotent sealing?
1, be applicable to any sealing:
In modern society, the product that need seal is ten hundreds of, and industry, agricultural, national defence, scientific research and even daily life almost involve sealing problem invariably.Yet collect, can be divided into aperture (Hatch Opening, case mouth, the mouth of pipe, bottleneck basically ... Deng), three big seal types such as pipeline (joint, lock stream), bar axle (rotation, back and forth, spiral), omnipotent sealing can be applicable to wherein any type;
No matter the size of 2 sealing part is little of millimeter, and is big to several meters, all be suitable for;
3, any sealing material: as hard materials such as metal, glass, pottery, concrete and rubber, nylon, teflon, graphite ... Deng flexible material, all be suitable for;
4, ability ultrahigh pressure, sealing load are up to 1500 more than the barometric pressure;
5, anti-high temperature more than 550 ℃ is because the maximum operation (service) temperature of resistant to elevated temperatures chromium nickel silicon alloy 3cr13Ni7si2 (heat is strong) is up to 700 ℃;
6, be able to bear strong corrosion;
7, simple in structure, processing, use, easy to maintenance, the life-span is long.
Practice is the sole criterion for testing truth! Omnipotent sealing must be verified in a series of practice processes such as design, processing, use, effect one by one! Science must not mix least bit falseness!
For this reason, only five kinds of suitable sealing coupling elements in first total design are got in examination, basic prototype as planning, be designed to " the full-metallic sealing experiment device " of a kind of similar ball valve, pipe joint, its material all adopts No. 45 steel, is assembled after several factory process respectively, and its sealing then is the junction that utilizes between each member, with reference to prototype, change, promptly design, be processed into simply, seal efficiently coupling part a little, to implement " oneself's sealing ".
Before the pressure testing, for inspection has or not the gap of being not good at causing because of processing, at first be contained in and carry out preliminary examination on the running water pipe, 3～4 barometric pressure of its pressure continuous 12 hours, drip and do not leak!
Thus can reasoning, if the metallic seal coupling part gapped, drip and also wears! Though depth of water myriametre, tens thousand of rice also could tiny drop not leak if no gap!
After the preliminary examination, further at 600-1000Kg/cm
2Hydraulic press on (this machine 1500kg/cm
2Pressure gauge has been broken, so fail to carry out 1500Kg/cm
2The test of pressure) carry out repeatedly pressure testing repeatedly, each pressure testing is to 1000Kg/cm
2The time, a bit run, drip, leak phenomenon does not all appear in 8 junction points that adopt the single-stage sealing;
3-4 barometric pressure do not leak! 600 barometric pressure do not leak! 1000 barometric pressure still do not leak! And to be that several factories are disposable process, and this shows:
1, metallic seal coupling part, if no gap, though the tens thousand of rice of the depth of water, also the reasoning that can not leak is right;
2, simple in structure, easy to process:
3, the pressure medium that can bear of metallic seal coupling part is far from reaching its limiting value;
As for can be high temperature resistant? be able to bear strong corrosion? because of the alloy that possesses these performances comes out already, according to different requirements, according to qualifications and with getting final product!
One of the present invention's full-metallic ball valve system is by being constituted as lower member:
The valve pivot; As accompanying drawing 2, effect; (1) is the maincenter of each member of contact; (2) with the junction point of valve rod, valve seat, all possesses the two-stage sealing function;
Valve rod: as accompanying drawing 3, effect: (1) opens and closes; (2) with valve pin-joint place, possesses the two-stage sealing function;
Stabilization ring: as accompanying drawing 4, effect: (1) stablizes valve rod; (2) dustproof;
Valve handle: as accompanying drawing 5, effect: (1) opens and closes; ⑵ and valve rod, valve pin-joint place possess sealing function;
Seal ring: as accompanying drawing 6, effect: (1) is in valve seat, ball sealer between the two, the tool interconnect function; (2) abdomen, the equal tool sealing function in back of the body two sides;
Valve seat: as accompanying drawing 7, effect: (1) line; (2) be the support of ball sealer; (3) be combined into the sealing coupling part with seal ring, play the two-stage seal action;
Ball sealer: as accompanying drawing 8, effect: (1) lock stream: (2) primary seal;
Pipe joint: see accompanying drawing 15, effect: (1) connecting tube and ball valve; (2) sealing;
V-arrangement all metal tube joint member is as follows:
Tubular union; As accompanying drawing 15, effect: (1) connects; (2) sealing;
Pipe joint: as accompanying drawing 16, effect: (1) connects; (2) sealing;
Seal element of the present invention is the sealing coupling part that moving quiet two Sealing couplings form, and for the purpose of narration and classification, the shape of seal element is simplified, and be marked with code name:
The sealing coupling part is made of the most basic bodies such as circular cone letter, circular hole, pipe and balls, and this just in time adapts with the uniform circular motion that working machine is done.
The circular cone tube: outer surface is called for short awl, and code name is V: internal surface is called for short bowl, and code name is U;
Circular hole: be called for short the hole, code name is O;
Pipe: internal surface is called for short pipe, and code name is G, and outer surface is called for short post, and code name is Q;
Ball: still claim ball, code name is D;
1, sealing valve port;
Ball, bowl type (D, U type) sealing coupling part are as accompanying drawing 11;
Awl, bowl type (V, U type) sealing coupling part are as accompanying drawing 11;
2, valve stem seal:
Awl, pass (V, O type) sealing coupling part are as accompanying drawing 12;
Awl, cast (V, G type) sealing coupling part are as accompanying drawing 13;
Post, bowl type (Q, U type) sealing coupling part are as accompanying drawing 13;
3, seal between valve seat, valve pivot:
Awl, bowl type (V, U type) sealing coupling part are as accompanying drawing 10;
4, seal between valve seat, pipe joint:
Post, bowl type (Q, U type) sealing coupling part are as accompanying drawing 9;
The technical characteristics of sealing coupling part:
1, the sealing coupling part is all formed by moving quiet two Sealing couplings, wherein has at least a Sealing to be " bowl " type or " hole " type;
2, the diameter of conductor rail mark between the sealing coupling part, less than the diameter at butt end of coupling part, and greater than its top diameter;
3, during coupling, wherein dynamic seal can be sought the initial position of line contact trace all around that static seal fixed and its coupling fits tightly to the sealing coupling part voluntarily actively in beginning.
Weigh the correctness of a things? be " reason "! So-called " reason " is the announcement of the characteristics of motion of generation, development and even decline to things, an invention be successful? whether at first will weigh its principle correct? the present invention can be " reason " that high-pressure medium seals:
1, Mi Feng initial contact is the circumference contact, and the point of contact of any correspondence on the Line of contact all overlaps and none gap;
The more satisfactory seal element that the sealing coupling part makes this sealing principle become a reality just.Because with a plane perpendicular to ball, circular cone tube, pipe axis, cut them respectively arbitrarily, the contact trace of the inner and outer surface of plane and ball, tube, pipe has unlimited, and is circle, and the point of contact of any correspondence on its contact trace all overlaps.
Because all must be round to a fixed point apart from the track that is the moving point of a constant on same plane, and all overlap.
As ball, bowl type sealing coupling part, when the ball amount is gone into (on the annulus of similar standard ball let-down in standard) in " bowl ", ball can be sought the position of the initial circumference contact trace that " bowl " of fixed and its coupling fit tightly voluntarily, and no matter ball and " bowl " are made with plasticity or elastic material, its result is the same! The contact trace of sphere and " bowl face " must be round, if do not overlap, then must be ellipse when the dead in line of ball and " bowl "!
No matter be circle or oval, any corresponding points on sphere and the bowl face contact trace all overlap.This characteristic is important, and its practical significance is, even some errors take place during assembling, without cease to overlapping as two axis, sealing coupling contact still fits tightly! Sealability is also unaffected.As for other sealing coupling parts, all have these characteristics.
2, resiliently deformable takes place in the sealing coupling part under the sealing force effect, gradually becomes the narrow face contact of ring by initial circumference contact;
The sealing coupling part is if adopt alloy to process, because of its initial line area of contact equals zero, comparatively speaking, so can be under little sealing force effect, resiliently deformable can take place, thereby can eliminate the fine clearance of " the face injustice " being not good at being caused because of processing on the one hand voluntarily actively; Make initial circumference contact gradually become the narrow face contact of ring on the other hand, simultaneously, relative displacements such as " shorten, tighten, hold round " takes place, thereby can eliminate the fine clearance of being not good at forming " justifying " because of processing voluntarily, contact is fitted tightly more; And prolonged the infiltration road Jing of medium, improved sealing load; If two Sealings in the coupling part with plastic material or make with bullet, plastic material respectively, after exerting pressure, are out of shape greatlyyer, and area of contact is bigger, and the pressure and temperature that bears medium is lower.
For preventing cutting edge contact damage sealing coupling part, so except that ball sealer, all contact position that is blade shape of all the other coupling parts all should be processed into the round angle that radius R equals 0.5～1.0 millimeter.
The technical characteristics of sealing mechanism:
The initial contact of sealing is the circumference contact that fits tightly, the sealing coupling part is to meet the more satisfactory seal element of realizing this requirement, it is when the beginning coupling, can seek the position of the initial circumference contact trace that fits tightly surely voluntarily actively, after the sealing force effect, the initial line contact fades to the narrow face contact of ring that fits tightly more.In brief, sealing is gradient to narrow face contact by the line contact.
Technical characteristics of the present invention:
1, Mi Feng initial contact is the circumference contact that fits tightly, the sealing coupling part is to meet the more satisfactory seal element of realizing this requirement, it can be when the beginning coupling, can seek the position of the initial circumference contact trace that fits tightly surely voluntarily: after the sealing force effect, the initial line contact gradually becomes the narrow face contact of ring that fits tightly more actively.In brief, sealing is gradient to narrow face contact by the line contact;
2, be basis with omnipotent sealing mechanism, utilize junction between each member of product, change, design, be processed into simply, seal efficiently coupling part a little, implement single-stage or multistage " oneself's sealing " with simplified structure, only just set up seal element separately at the frequent sealing position of running.Be that member, Sealing are integrated:
3, other members of sealing coupling part and product are the same, and available same suitable alloy material processes, thus above high pressure, the high temperature more than 550 ℃ and the deep-etching of 1500 barometric pressure of ability, and long service life.
Advantage of the present invention:
1, ball valve, pipe joint are the supporting series product of full-metallic, simple in structure, processing, use, easy to maintenance, the life-span is long:
2, concern direct bearing because of sealing mechanism, utilize the junction between each member of product, design, be processed into simply, seal efficiently coupling part, implement single-stage or multistage " oneself's sealing ", member, Sealing, available same suitable alloy material processes, so can bear the above high pressure of 1500 barometric pressure, the high temperature more than 550 ℃ and being able to bear strong corrosion.
For making " again ", the convenient meter of " figure " contrast, the existing special accompanying drawing that foregoing is mentioned is illustrated as follows:
1, because of map sheet is 22 * 14 centimetres, for ease of drawing, 15 millimeters of the special nominal diameters of pressing pipe, nominal pressure 1500Kg/cm
2, 550 ℃ of heatproofs, (full-metallic sealing experiment device is single-stage sealing, sealing load 1000Kg/cm to adopt the two-stage sealing
2, because of 1500Kg/cm
2Pressure gauge has been broken, and temporarily can't carry out 1500Kg/cm
2Pressure test) design, be depicted as the full-metallic ball valve, the plan of pipe joint:
2, symbol among the figure
φ---diameter; R---radius; 1, II---section symbols;
G---pipe thread; M---regular screw threads; F---sealing Line of contact;
3, dimensional units: millimeter;
4, all blade shape contact position that is of sealing coupling part all should be processed into the round angle that radius R equals the 0.5-1 millimeter;
5, stabilization ring (as among Fig. 1 3.) with the valve pivot (as among Fig. 1 1.) between cooperate: be the 4th kind of transition fit Gd;
6, tolerance: be ± 0.05;
7, the degree of finish of the contact position of seal element is 10, and surplus is 7; Valve body is all electroplated the metal that needs in case of necessity;
8, be the total erection drawing of full-metallic ball valve as Fig. 1;
9, full-metallic air ball valve member figure;
As Fig. 2 (or as among Fig. 1 1.) is the valve pivot;
As Fig. 3 (or as among Fig. 1 2.) is valve rod;
As Fig. 4 (or as among Fig. 1 3.) is stabilization ring;
As Fig. 5 (or as among Fig. 1 4.) is valve handle;
As Fig. 6 (or as among Fig. 1 5.) is inside and outside two way sealed circle;
As Fig. 7 (or as among Fig. 1 6.) is valve seat;
As Fig. 8 (or as among Fig. 1 7.) is ball sealer;
As Figure 15 (or as among Fig. 1 1.) is pipe joint;
10, full-metallic ball valve sealing coupling part
Sealing valve port;
As Figure 11 is ball bowl (D, U) type sealing coupling part;
Be awl bowl (V, U) type sealing coupling part as Figure 11;
Valve stem seal:
As Figure 12 is taper hole (VO) type sealing coupling part;
As Figure 13 is Taper Pipe (VG) type sealing coupling part;
As Figure 13 is post bowl (QU) type sealing coupling part;
Seal between valve seat valve pivot:
Be awl bowl (VU) type sealing coupling part as Figure 10;
Seal between the valve seat pipe joint:
As Fig. 9 is post bowl (QU) type sealing coupling part;
11, V-arrangement all metal tube joint
As Figure 15 is tubular union, (dynamic seal);
As Figure 16 is pipe joint, (static seal);
12, V-arrangement all metal tube joint sealing coupling part:
Sealing between pipe joint, tubular union (or pipeline):
As Figure 14 is compound post bowl (QU) type sealing coupling part.
Essential implementation of the present invention:
1, structure of the present invention is quite simple, process also very convenient, so as long as can make the processing technology program that a collar ring links closely, need not special processing;
2, according to withstand voltage, heatproof to product ... etc. different requirements, design, be depicted as serial drawing taxonomically, carry out fine finishing, and strictly detect item by item;
3, the contact trace between two Sealings should be perpendicular with the Sealing axis, and must be on same plane;
4, the tapering of seal element " bowl " should be at 30 °---be advisable between 45 °;
5, all Sealings are the contact position of blade shape, all should be processed into radius R and equal round angle between the 0.5-1.0 millimeter;
6, physical dimension must accurately especially seal the position, round angle, compressive strain equidimension factor should be counted during design.
Claims (6)
- Sealing is the key of ball valve, pipe joint performance quality.Up to the present.Domestic and international existing sealing, although of a great variety, common basic technical features is: be face contact seal, Sealing is plastic material with material; Difficulty bear High Temperature High Pressure and deep-etching, fragile, the life-span short.The present invention then adopts the sealing coupling part through developing for many years to implement sealing, and the main points of its technological scheme are as follows:1, the full-metallic ball valve adopts metal constructions such as valve pivot, valve rod, stabilization ring, valve handle, seal ring, valve seat, ball sealer, pipe joint to form: its sealing then adopts the sealing coupling part of junctions such as valve port, valve pivot, valve seat, valve rod, pipe joint to constitute sealing system:Pipe joint system is made up of members such as pipe joint, tubular union; The sealing coupling part of junctions such as pipe joint, tubular union, valve seat or pipeline is adopted in its sealing, implements " oneself's sealing ".
- 2, the sealing coupling part is to be formed by moving quiet two Sealing couplings, and its most basic structural form is circular cone, circular cone tube, cylinder, pipe, circular hole, ball (platform), circle green pepper etc.And in one moving one quiet two Sealings, have at least one to be taper barrel (i.e. " bowl " type) or circle hole shape (i.e. " hole " type).When one moving one quiet two Sealing couplings, can seek voluntarily and decide contact position, but two kinds of situations may occur:One is the dead in line of two Sealings, its contact trace then is in same plane, identical, half coincidence (similar standard ball, let-down is on the standard annulus) through two equal circles in the center of circle is so all corresponding point of contact will overlap and none gap one by one on the contact trace.In other words, sound two Sealings can be sought the position of the initial circumference contact trace that fits tightly surely voluntarily when the beginning coupling, have excellent sealing performance.And no matter be that plasticity or elastic material are made, its result is the same.If make with metal, after implementing sealing force, resiliently deformable takes place, then initial circumference contact fades to the narrow face contact of ring, thereby can eliminate " face injustice " or the fine clearance of " justifying " being not good at forming because of processing voluntarily actively, contact is fitted tightly more.Big plastic deformation be difficult for to take place in metal in addition, so can bear the High Temperature High Pressure of medium: and two Sealings in the coupling part, as if with plastic material or make with bullet, plastic material respectively, after applying sealing force, be out of shape greatlyyer, area of contact is bigger, and the pressure and temperature that bears medium is lower.The 2nd, both do not coincide by axis, contact trace ovalize then, but all corresponding point of contact still overlap one by one on the contact trace.So it is all unaffected with material, sealability etc.
- 3, owing to the sealing coupling part can process with alloy, so utilize the junction between the metal construction, directly Design and Machining becomes the sealing coupling part, and is fastening with the screw connection again, and sets up Sealing no longer separately, with tube structure, convenient processing;
- 4, according to High Temperature High Pressure, different requirement such as be able to bear strong corrosion, can select for use corresponding alloy to process;
- 5, for preventing cutting edge contact damage sealing surface, so all contact position that is blade shape of Sealing all should be processed into the round angle that radius R equals the 0.5-1 millimeter.
- 6, the contact trace between two Sealings of sound.Must be in same plane.Otherwise, breach will appear, form the gap.But, can reach this technical requirements as long as the coupling part physical dimension is accurate, surface finishment meets standard.For this reason, summary is got up, technical characteristics of the present invention:1, sealing is gradient to narrow face contact by the line contact;2, Sealing all is metallic material with material.3, member, sealing coupling part are integrated:4, can bear High Temperature High Pressure and deep-etching:5, the sealing coupling part is by the most basic circular body---and one moving quiet two the Sealing couplings of formations such as circular cone, circular cone tube, cylinder, pipe, circular hole, ball (platform), plectane form, but wherein have at least a Sealing to be " bowl " type or " hole " type.Static and dynamic sealing spare is when the beginning coupling, can seek the position of initial circumference (or oval week) the line contact trace that fits tightly surely voluntarily: after the effect of sealing force actively, resiliently deformable takes place, initial circumference (or oval week) line contact fades to the narrow face contact of ring (or oval ring) that fits tightly more, and no matter coupling part is made with plasticity or elastic material, its result is similar, plastic deformation is bigger, area of contact is bigger, and the pressure and temperature that bears medium is lower.Thereby make sealing mechanism have the characteristic of omnipotent sealing.Therefore, claimed scope of the present invention is:1, ring seal full-metallic High Temperature High Pressure ball valve, V-type all metal tube joint (series); 2, omnipotent sealing mechanism; 3, sealing coupling part; (1) ball bowl type (D, U type) sealing coupling element; (2) awl bowl type (V, U-shaped) sealing coupling element; (3) taper hole type (V, O type) sealing coupling element; (4) Taper Pipe type (V, G type) sealing coupling element; (5) post bowl type (Q, U type) sealing coupling element; (6) V-seal coupling element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95119317 CN1145463A (en) | 1995-11-23 | 1995-11-23 | Zuoshi full-metal ball valve, V-shape metal tube joint |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 95119317 CN1145463A (en) | 1995-11-23 | 1995-11-23 | Zuoshi full-metal ball valve, V-shape metal tube joint |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1145463A true CN1145463A (en) | 1997-03-19 |
Family
ID=5081947
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 95119317 Pending CN1145463A (en) | 1995-11-23 | 1995-11-23 | Zuoshi full-metal ball valve, V-shape metal tube joint |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1145463A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009079888A1 (en) * | 2007-12-18 | 2009-07-02 | Zhongxi Tan | A control ball valve |
| CN104141840A (en) * | 2014-08-05 | 2014-11-12 | 李志勇 | Novel pure-metal seal joint structure |
-
1995
- 1995-11-23 CN CN 95119317 patent/CN1145463A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2009079888A1 (en) * | 2007-12-18 | 2009-07-02 | Zhongxi Tan | A control ball valve |
| CN104141840A (en) * | 2014-08-05 | 2014-11-12 | 李志勇 | Novel pure-metal seal joint structure |
| CN104141840B (en) * | 2014-08-05 | 2017-01-11 | 李志勇 | Novel pure-metal seal joint structure |
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