CN1310305A - Halogen corrosive gas valve and its producing method - Google Patents
Halogen corrosive gas valve and its producing method Download PDFInfo
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- CN1310305A CN1310305A CN 01112381 CN01112381A CN1310305A CN 1310305 A CN1310305 A CN 1310305A CN 01112381 CN01112381 CN 01112381 CN 01112381 A CN01112381 A CN 01112381A CN 1310305 A CN1310305 A CN 1310305A
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Abstract
A valve, especially a ball valve comprises: a valve body having a fluid passage from a fluid inlet through a valve body/valve seat part to a fluid outlet; and a valve cover of an opening part which is integrally installed with the valve body and blocking the fluid passage. A metal fluoride passive state layer with a thickness of 0.1 to 5 [mu]m is formed at least on the surface of the fluid passage of the valve body. More preferably, the surface of the fluid passage has a nickel membrane. The surface of the nickel membrane is forced to be oxidized and then fluorized to form the abovementioned metal fluoride passive state layer. A valve stem goes through the front-end part of the valve cover and forms the valve body. The clearance formed by the valve stem going through the valve cover is sealed by a bellow construction. The bellow is made by hastelloy and is a seamless construction. The fluid passage from the fluid inlet through the valve body/valve seat part to the fluid outlet forms an S-shaped passage. The valve opening is less than (1/3)x1.1 of the nominal diameter of the valve.
Description
The present invention relates to the manufacturing equipment of halogen corrosive gas such as chlorine or fluorine or liquid and valve and the manufacture method of in the use of these gases, consumer device, using thereof.
Because halogen corrosive gases such as chlorine or fluorine are the pressurized gas with violent corrosivity and toxicity, therefore for the valve that is arranged in its manufacturing equipment or the use consumer device, the corrosion resistance that requires it to have the safeguard construction that does not leak these gases and prevent corrosivity generation corrosion.In chlorine (soda) industry equipment, what use in the long-term reality is for suppressing to leak the spherical valve of general gland pattern having been made improved a little gland seal structure always.In Fig. 1, provided the structure of representative spherical valve, but its problem is: in this gland seal ball-type valve structure, when opening and closing valve body 1, must move up and down plug (valve rod) 2, at this moment, can't avoid connecting gland portion 4 places of valve chest 3 and the chlorine leakage that causes by the gap that the fatigue of gland liner 5 produces.
To its outside countermeasure, various improvement have been carried out as preventing gas leakage for many years.Fig. 2 has represented an example in these improvement, remove and increase gland, with four liners 12,13,14,15 multilayers are overlapping to improve close divinatory symbol, when valve is opened fully, play the reverse graft seat by valve body lug boss and gland seat simultaneously and be used for preventing the method for leaking, or O shape ring 10 (with reference to Fig. 1) are set at sealed department, to outside the method that can not carry out secondary seal with the gas of gland seal etc., also should adopt the method for doing one's utmost to avoid gas leakage.But, liner can't be avoided the deterioration of performances such as fatigue, distortion, wearing and tearing, and, because valve rod is made by stainless steel, therefore sneak into the meetings such as hydrochloric acid that produced and corrode stainless surface film oxide, thereby corrode valve rod and between the gland liner, form the gap by chlorine or trace water, trickle leak path, many more by the slip that the valve switching station produces, just can produce and enlarge described leak path more, and cause leakage to increase.If corrosive gas leaks to outside from gland, then can produce corrosive compounds such as chlorine with moisture content reaction on every side, at first corrode liner, next corrodes O shape ring, stuffing box, and then corrosion valve rod.Increase in order to prevent to leak, therefore to carry out repeatedly gland bolton, thereby increased the weight of the operation of handle, no matter carry out finally that the manipulation of how many times is fastening can not to stop leakage.This shows that the valve of sealing mechanism can not prevent to leak at all, therefore must change liner, valve rod, gland, filler and box by carrying out complicated maintenance.
The metal seat of valve seat between metal, when embedding tinsel, lubricant oil carbon distribution, material slag etc., can cause the damage of valve body or body seal portion, can not the complete closed fluid, thereby cause internal leakage, herein, if prevent to leak and bolton repeatedly, nature will inevitably strengthen the switching operations labor intensity, thereby causes that finally screw thread ruptures, action is bad.
Owing to above reason, for the manufacturing at halogen corrosive gases such as chlorine or fluorine gas, the valve of installing in the consumer device, using requires it that halogens such as chlorine or fluorine are had good anti-corrosion, and cuts off fully with the outside, can not cause internal leakage.In the soda industry equipment, wish that urgently using gases is difficult to the valve that leaks, is difficult to corrode especially.
Under this background, the object of the present invention is to provide such valve and manufacture method thereof, it is in the manufacturing equipment that is assemblied in halogen corrosive gas liquids such as chlorine or fluorine, and in utilizing these gases or consumer device, can realize extremely effectively decay resistance, and prevent to leak by the bad action that corrosion is caused.
In the present invention, the most important aspect that realizes above-mentioned purpose is: make valve body by the ideal material that halogen corrosive gas liquids such as chlorine or fluorine is had corrosion resistance, thereby even provide the valve that the halogen corrosive gas liquid is also had basically longer life.And, in view of various ways all are feasible, therefore provide following content:
(1) a kind of valve, it is provided with valve body (main body), this main body has by the fluid passage of valve body/valve seat from fluid input to fluid output, with the valve body one assembling valve gap (bonnet) with the opening portion of closed fluid passages, it is characterized in that: it has the metallic oxide passive layer that on the skin covering of the surface of the fluid passage of valve body thickness is at least 0.1-5 μ m.
(2) in (1) described valve, have the nickel protection layer on the surface, fluid passage of main body, behind this nickel protection film surface of forced oxidation, form described metal halide passive state protective layer.
(3) in (1), in (2) in valve of record, have run through valve gap constitute the valve rod (bar) of valve body by the top, valve rod connects the gap that valve gap produces and is sealed by bellows structure.
(4) in (3) in the valve of record, bellows is made by the corrosion resistant nickel-base alloy and is had a jointless structure.
(5) in the valve of putting down in writing in (4), the bellows that the corrosion resistant nickel-base alloy is made is welded on the bellows link that the corrosion resistant nickel-base alloy is made, and described bellows link is welded on bellows flange and the dish holder.
(6) in (5) in the valve of record, between valve body and valve gap with fluid sealability ground clamping said flange, thereby finish the aforementioned sealing of valve rod.
(7) valve of putting down in writing in (1)-(6) prevents the revolution of valve rod by rotary actuator.
(8) in (1)-(7), in the valve of record, in valve gap, also has the liner sealing configuration of valve rod.
(9) in (1)-(8), in the valve of record, be S font passage by the aforesaid fluid passage of valve body/valve seat from fluid input to fluid output.
(10) in (1)-(9) in the valve of record, the aperture of valve should be less than (1/3) * 1.1 of the nominal diameter of valve.
(11) in (1)-(10) in the valve of record, valve body is made by low temperature carbon steel and its fluid passage forms by machining at least.
(12) in the valve of putting down in writing in (1)-(11), valve seat is a soft sealing structure, and soft seal is made by teflon.
(13) valve of record is a spherical valve in (1)-(12).
(14) valve of record is sluice valve or safety check in (1)-(12).
(15) in (1)-(14) valve of record to be used for halogen be corrosive gas or liquid.
(16) manufacture method of valve; it is characterized in that: it comprises at least at valve body substrate surface formation metal protective film; after passing through its surface of oxidation material forced oxidation; make the step of described forced oxidation film and fluorinated gas reaction, and the step that valve body and other valve arrangement spare are linked and packed.
(17) in (16), in the manufacture method of the valve of record, form the aforementioned metal protective film by nickel alloy electrolysis of nickel territory or electroless plating.
(18) in (16) (17) in the manufacture method of valve of record, aforesaid oxides matter is to contain aerobic, inferior nitrogen oxides, nitrogen peroxide, ozone and contain at least a in the mixed gas of these gases.
(19) in the manufacture method of the valve of putting down in writing in (16) (17), aforesaid oxides matter is the solution that contains nitric acid or hydrogen peroxide.
(20) in the manufacture method of the valve of putting down in writing in (16) (17), aforesaid oxides matter is the oxygen that is produced by anode by anodizing.
(21) in (16)-(20) in the manufacture method of valve of record, aforementioned fluorinated gas is for containing from by the fluorine element at least a gas of selecting in the group of chlorine trifluoride and Nitrogen trifluoride formation.
(22) in (16)-(21) in the manufacture method of valve of record, the number of assembling steps that connects the valve arrangement parts contains bellows is welded on the bellows link, and this bellows link is welded on step on bellows flange and the dish holder.
(23) in the manufacture method of the valve of putting down in writing in (16)-(22), valve body is made by low temperature carbon steel, behind the fluid passage by machining formation valve body, forms metal protective film.
Fig. 1 is the sectional view of representative gland ball-type seal valve.
Fig. 2 is the sectional view of the gland seal portion of improved spherical valve.
Fig. 3 is the sectional view of the bellows ball-type seal valve of the embodiment of the invention.
Fig. 4 is the partial enlarged drawing of sylphon seal portion among Fig. 3.
What the present invention is directed to is to be suitable for using when processing the halogen corrosive gas of chlorine or fluorine etc., particularly establishes Put at the industrial chlorine manufacturing equipment, soda electrolysis installation and use the equipment of chlorine for example uses chlorination Water works is bleached with the valve in the pipeline by chlorine in the pulp manufacture equipment.
Be the valve of corrosive gas liquid about processing halogen, with the requirement spy who puts down in writing in the description of the Prior Art Property is compared, and the present invention provides the valve base material that corrosive gas liquid is had the good corrosion resistance energy by (1) Valve, more particularly, be the oxide of 0.1-5 μ m by forming thickness on valve base material fluid passage surface The passive state film provides the valve that basically is applicable to the halogen corrosive gas liquid.
But should not be confined to especially the structure of valve of the present invention, for example can use spherical valve, sluice valve or check-valves, Also can use the valve of the various structures such as ball valve, butterfly valve, bellows valve, diaphragm valve.
Valve body (main body) and structure member are made of low temperature carbon element steel or stainless steel etc. usually. Because described material When material uses, must adopt the corrosion countermeasure, so the present invention passes through at valve base preferably in the corrosive gas such as chlorine The material surface forms metal protective film, forms thickness 0.1-5 μ m on its surface, and comparatively ideal is 1-3 μ m, What be preferably 1-2 μ m fluoridizes the passive state film, to improve corrosion resistance. Forming thickness is fluoridizing of 0.1-5 μ m The valve of passive state film can guarantee that the corrosive gas liquid such as chlorine are had extremely effectively decay resistance.
The described passive state film of fluoridizing can be by after must forming metal protective film according to the substrate surface of valve, with oxidation Its surface of thing forced oxidation, thereby by described forced oxidation film and chlorine reaction manufacturing are formed.
Herein, about forming metal protective film on valve base material surface, to pass through its table of oxidation material forced oxidation Behind the face, make the step of described forced oxidation film and fluorinated gas reaction, the inventor is at Unexamined Patent 11-92912 Disclose in number communique.
That is, in the present invention, at first, must form metal protective film according to the substrate surface of valve member. Described Metal protective film can adopt by nickel, copper, silver, aluminium or contain the electrolysis electricity of the alloy of more than one these materials The diaphragm that plating, electroless plating, physical evaporation (PVD) etc. form. As metallide, can adopt the Ni electricity Plating, Ni-Cu electroplate, Ni-W electroplates etc. As electroless plating, can adopt that Ni-P electroplates, Ni-B electroplates, Ni-P-W electroplates, Ni-P-B electroplates etc. In addition, as PVD, can adopt the sputtering method of Ni or its alloy etc. The diaphragm that electrolysis by nickel or nickel alloy or electroless plating form is comparatively ideal. Though the formation diaphragm The base material of valve is made of aforementioned common low temperature carbon steel or SU304, but before metal protective film forms, Carry out the known base treatment such as degreasing, pickling, grinding, bead.
Then, in case forced oxidation metal protective film surface makes afterwards described oxidized metal diaphragm and fluoridizes Gas reaction. In autoxidation, the thickness of oxide-film is tens-hundreds of dust, and forms firm oxide-film Metal be confined to the special metals such as aluminium. When discovery is fluoridized, should carry out putting of oxygen and fluorine behind forced oxidation Change reaction to form fluorinated layer. Therefore, the thickness of fluorinated layer is with respect to the proportional increase of the thickness of forced oxidation layer, The fluorinated layer film thickness monitoring that is formed on the metal protective film surface by the present invention is formed on surperficial oxide thickness, Can provide the fluorinated film of being thickeied by the above film of so-called passive state gained with this. The fluorinated layer that forms like this is at corrosion resistant Has in fact very good performance on erosion property and the durability.
Although metal oxide layer in a broad sense for containing the metal level of fluorine, in fact be preferably fully by The layer that metal fluoride consists of. Herein, the essence implication of fluoridizing is, though the oxidized metal diaphragm needn't become 100 The fluoride of %, but preferably replace with degree and the fluorine that can not detect oxygen. Metal also not necessarily must Fully oxidized, the thickness of fluorinated layer also can be inhomogeneous, also can make fluoride district and fluorine diffusion region mixed Together. When carrying out the fluorine processing behind forced oxidation, just the displacement of oxide layer and fluorine generates fluoride, and Also can cause fluorine to the diffusion of diaphragm metal, the result can form thicker fluorinated layer. In this case, Fluorinated layer by in fact being consisted of by metal fluoride the 1st layer and have the 2nd layer of chlorine to consist of in its lower floor's diffusion.
Can be so-called gaseous oxidation as the forced oxidation means. Oxygen in this case or itself and neutral or The such mist of inert gas is comparatively ideal, and nitrous oxide, hyponitric acid, ozone or itself and in Property or the such mist of inert gas are comparatively ideal. In this case, make described gas at high temperature With Metal Contact. Forced oxidation means as other can adopt liquid phase oxidation. Its also can by immerse nitric acid, Carry out in the liquid such as aqueous hydrogen peroxide solution. Utilize the electrolyte such as alkali, also can anodized metallization with on its surface Form oxide-film. Above-mentioned forced oxidation processing method can make up according to the oxide thickness that forms.
Equally, fluorination treatment is to utilize 100% gas of fluorine, chlorine trifluoride, Nitrogen trifluoride etc., or makes like this The gas that in the inert gases such as nitrogen, helium, argon, dilutes of gas, or utilize the plasma gas of fluorine etc., make The oxidation protection film reaction that the top layer of metal surface forms is with the diffusion layer that obtains fluorine and the diaphragm of oxide Method. Specifically, can be undertaken by the following stated. That is, above-mentioned metal is packed into atmospheric gas phase general-purpose type is anti-Answer stove, under oxidizing gas circulation, after reacting furnace is heated to the temperature of regulation and keeps the stipulated time, Fill fluorinated gas under the set point of temperature to carry out the reaction of stipulated time, process to carry out surface fluorination. This In the situation, before the reacting furnace of packing into, usually carry out degreasing metal, processed, thereby can improve after this shape The forced oxidation film purity that becomes is also avoided defective. But, owing to remain in following thin of tens of dusts of metal surface The a large amount of formation of natural oxide film are forced to oxidation simultaneously, therefore, needn't remove before forced oxidation.
The temperature of reacting furnace is generally 200 ℃-600 ℃ in the forced oxidation of nickel and copper, it is desirable to especially 300 ℃-500 ℃. Reaction time was generally 1 hour-48 hours, it is desirable to especially be 3 hours-24 little The time. Aluminium is preferably by anodic oxidation. Equally, oxidation temperature is 100 ℃-700 ℃ under normal pressure, and is special It is desirable to 150 ℃-500 ℃. Reaction time was generally 1 hour-48 hours, and it is 3 little it is desirable to especially Time-24 hour. At described desirable lower limit temperature and under the not enough time, the oxygen of forced oxidation layer can be not fully by Displacement, and can fully not spread from the top layer of fluorine, on the other hand, if surpass ceiling temperature and time, then can Cause the fluorine vigorous reaction and form crackle at diaphragm.
In valve of the present invention, though form at least the metal of regulation film thickness on the surface, fluid passage of valve body Fluoride layer, but not only also can form described metal fluoride at valve body but also on surfaces, fluid passage such as valve gaps Layer. And, though the valve outside need not fluoride layer, but when in valve, carrying out surface treatment, preferably make fluid logical Process with the outside on the surface, road.
Because forming described film thickness on the surface and be the valve of the metal fluoride layer of 0.1-5 μ m shows halogen The corrosive gas fluid has higher corrosion resistance, therefore, and at halogen system (halogen) corrosive gas streams Can increase the life-span of valve in the purposes of body.
Below, the ideal structure of valve of the present invention is described.
(2) structure of valve is corrugated tube sealing structure.
It is that leakage by gland seal section causes substantially that in the past spherical valve leaks. Because general spherical valve Adopt the gland seal structure, therefore can not structurally avoid fully leaking. Therefore, for chlorine and fluorine like this Poisonous gas owing to have danger, therefore wish structurally to avoid fully the outside that is produced by gland section Leak.
According to this reason, in valve of the present invention, form valve body in the valve stem tip that represents spherical valve, In the valve of the structure of valve rod perforation valve gap, in order to adopt bellows in the gap that forms between sealing gland and the valve rod Sealing. Consider corrosion resistance and life-span as the bellows of movable part, though used gapless hydraulic pressure Integrally formed corrosion-resistant nickel-base alloy, but preferably adopt corrosion-resistant nickel-base alloy C-22.
Though at first for make corrosion-resistant nickel-base alloy bellows be used for carrying out among the fully sealing assemble welding with The performance performance, but with corrosion-resistant nickel-base alloy bellows-welding during at stainless steel and carbon steel, the weld part meeting Produce alloying and corrosion resistance is reduced and deterioration, so wish in case with corrosion-resistant nickel-base alloy bellows weldering Be connected on corrosion-resistant nickel-base alloy parts, for example, on the bellows joint member, should be to be different from other method of welding With liquid-tight form with described corrosion-resistant nickel-base alloy component assemble flange and the dish keeper on. Even if corrosion-resistant The nickel-base alloy bellows also can tap into the corrosion-resistant nickel-base alloy of row precision welding each other by penetration weld. Because the corrosion-resistant nickel-base alloy parts such as corrosion-resistant nickel-base alloy connector are thinner easily securely soldered because of wall On stainless steel and carbon steel, therefore should carry out airtight sealing by welding and liner etc. as required so that Acquisition has the structure of highly corrosion resistant. Yet, for the corrosion-resistant nickel-base alloy parts of welding bellows, Because corrosion-resistant nickel-base alloy cost is very high, therefore use it on the big parts as the bellows flange In any case all be non-remunerative. Therefore, bellows-welding should be connected at small-sized corrosion-resistant nickel-base alloy bellows On the fitting, and bellows joint member is assemblied in bellows flange that stainless steel material makes or dish keeper like this Big parts on. For example firmly solid with helicitic texture at bellows joint member and bellows flange or dish keeper After deciding to weld simultaneously to seal, because welding is enough to realize the purpose of airtight sealing, therefore welding Even section adopts corrosion-resistant nickel-base alloy and stainless alloy-layer also can give full play to performance. The bellows flange Or the dish keeper utilizes liner etc. just can easily realize airtight sealing. When with the sylphon seal valve rod, By adopting described composite construction, utilize corrosion-resistant nickel-base alloy bellows, can improve sealing, corrosion resistant fully The stability of erosion property and structure, and realize at the very start sealing with pratical and feasible value.
In corrugated tube sealing structure in the past, manipulation is fastening (tightens handle for the raising sealing must strengthen Hand), even particularly produced a small amount of wear and aging when the liner of bellows, also must carry out very strong tight Gu, thereby the operator caused inconvenience, and in corrugated tube sealing structure of the present invention, because sealing Complete and fastening force has nothing to do, so the switch of valve (handle) is very light, thereby can bring into play in practice very big Effect.
In the present invention, for the rotation of anti-stopping bar, used the revolution retainer, only made about bar does with this Motion, and can not reverse thin bellows, thus prolonged the life-span of valve. Bar is usually followed and is moved up and down and rotate, Thereby this rotation can cause the wear and aging formation of gland section and cause the reason of leaking, but in the present invention, adopt With bellows and gland section and employing revolution retainer, improved the dish of sealing and the sealing of seal connector, Internal leakage, the outside double sealing structure that leaks have been realized can not producing.
(3) valve seat is soft sealing structure, uses polytetrafluoroethylene (PTFE) (PEFE) in soft seal.
Soft seal specifically replaces metal dish in the past, by having flexible corrosion resistant material, For example PEFE consists of valve body contact site (dish). Valve seat adopts soft seal to improve and closes performance, thereby even embeds Some foreign matters also can Leakage prevention. Can reduce thus operation (handle) torque, and form and to be very easy to more The structure of changing. Soft seal for example can be changed to Monel high-strength corrosion-resisting ambrose alloy metal sealing, by described illiteracy High-strength corrosion-resisting ambrose alloy metal sealing can improve the corrosion resistance of liquid towards chlorine like this. Be active sulfur at halogen The soft sealing structure that adopts in the valve seat of the valve of body is not known.
(4) gas flow is the S font, and valve opening is less than (1/3) * 1.1 of the nominal diameter of valve.
Gas flow can be guaranteed flow and implementation structure compactness for the S font. The gland seal ball-type of selling at present Valve, because the longitudinally pipe center straight line setting of its entrance channel, outlet is provided with from valve chest top sharply to tilt The hole, therefore can't strengthen the aperture of valve body (dish keeper and dish), and owing to increased resistance, thereby increase The pressure loss, thereby can not guarantee flow. Therefore, the valve body aperture should be designed to be equal to or greater than the valve nominal 1/2 of diameter. In order to solve problem in the past, bellow sealed valve of the present invention has adopted such structure: Make the runner of gas be the S font, when starting valve body, the fluid of discharging from valve seat namely flows into outlet, and outlet is inclined Oblique hole directly is connected valve seat. By this structure, minimum valve opening is 1/3 of nominal diameter, because Therefore the remarkable bellows that shortened compared with the past can make it be contained in the body, thus the implementation structure compactness Change, reduce cost. Though in order to ensure flow, valve opening is preferably 1/3 of nominal diameter, but in practice, Its design can centered by 1/3 ± 10% scope in.
(5) form the fluid passage of the base material of valve by machining.
Though the base material of valve adopts low temperature carbon steel more,, therefore preferably form the surface, fluid passage of base material by machining owing to must improve surface roughness in order to carry out fluoridation on the surface, fluid passage of base material.Since in the casting steel, the purpose that the very not suitable metal pentafluoride of the present invention of general surface roughness is handled, though therefore can machining go out the surface, fluid passage of cast steel, preferably adopt machining solid forging steel to form valve body.
In Fig. 3, provided the structure of the sylphon seal spherical valve of one embodiment of the invention.
Valve body (body) 101 is low temperature carbon steel (SFL2), and nominal diameter for example is 15 millimeters, and 20 millimeters, 25 millimeters, 40 millimeters, 45 millimeters, 50 millimeters etc. fluid (gas, liquid) path 10 2 103 leads to outlet 104 by valve body/valve seat from entering the mouth.The upper opening that valve body 101 covers at path 10 2 by valve rod (bonnet) 106, thus valve casing formed.The surface of valve body 101 is (though need not surface at valve gap in the embodiments of figure 3; but if desired also can be on the surface of valve gap) form the nickel plating protective layer; behind forced oxidation, it is 0.1-5 μ m to form thickness that fluoridation is carried out on this surface, is preferably the metal fluoride layer of 1-2 μ m.
Have such valve body/valve seat, it is by the seal connector that constitutes valve seat at valve body 101 midway (SUS316 or Monel high-strength corrosion-resistant nickel alloy) 105, and the valve body that is formed on valve rod (SUS304) 107 tops of running through valve gap 106 constitutes.The valve body that is formed on valve rod 107 tops is made of dish retainer 108 and dish 109, and dish 109 is made of PTFE as the corrosion resistance flexible member may.Valve rod 107 moves up and down by the operation of handle 100, and the PTFE dish 109 of top valve body compresses the seal connector 105 of contact valve seat with the realization sealing, thereby carries out the switching of valve.Sealing by PTFE dish 109 and seal connector 105 forms soft seal.Adopt screw fixed between seal connector 105 and the valve body, simultaneously, preferably adopt the PTFE (packing ring of Gore company, its trade name is go ア テ ッ Network ス), it has such physical property, promptly as the packing ring 105a between seal connector 105 and the valve body, can lateral spread even compressed by valve rod yet.
Because valve rod 107 has connected valve gap 106, therefore must carry out fluid sealability (tightness) sealing, in this embodiment, the bellows 112 that utilizes corrosion-resistant nickel-base alloy C-22 to make seals.Bellows 112 two ends that utilize corrosion-resistant nickel-base alloy C-22 to make are welded on and utilize on the bellows link 113,114 that corrosion-resistant nickel-base alloy C-276 makes.Because described welding is the welding that utilizes between the corrosion-resistant nickel-base alloy, therefore should form durability and the higher joint of corrosion resistance by accurate welding (through welding welding).With reference to Fig. 4, it is the partial enlarged drawing on bellows top among Fig. 3, because the corrosion-resistant nickel-base alloy bellows link 113 of welded bellows 112 is to keep intensity with the screw thread 116a in the bellows flange of making at stainless steel (SUS316L) 115, therefore, get final product in order to carry out the weld part 116 that airtight sealing only welds corrosion-resistant nickel-base alloy bellows link 113 and corrugated stainless steel tubing flange.The welding of bellows link 113 that corrosion-resistant nickel-base alloy is made and Stainless Steel Disc holder (SUS316L) 108 also is identical.Make packing ring between valve body 101 and valve gap 106 to realize hermetic clamping bellows flange 115.In case corrosion-resistant nickel-base alloy bellows 112 is welded on the corrosion-resistant nickel-base alloy bellows link 113, just can make it engage bellows flange 115 and Stainless Steel Disc holder 108, thereby realize fully engaging the corrosion-resistant nickel-base alloy bellows of high price, and realize economic sealing configuration with certain intensity and corrosion resistance.
In the valve of Fig. 3, fluid passage 102 constitutes with the S font.Compare with the passage of Fig. 1,, and pass through the valve seat/valve body approximate vertical from the passage that inlet sends and rise, meet at passage in the position that is higher than valve seat towards outlet because entrance and exit passage almost parallel forms in Fig. 1.Form the shape that arrives outlet, therefore want fluid and can flow smoothly by described valve seat/valve body, valve rod 107 must keep the larger opening greater than nominal diameter 1/2 so.In contrast to this, in the S of Fig. 3 font runner, even valve opening also can obtain sufficient flowing below 1/3.Described less valve opening has the effect of remarkable shortening bellows size.To move up and down in order only realizing, must to have quite long size as the corrosion-resistant nickel-base alloy bellows of fabricated metals.Therefore, in the valve of Fig. 3,, also bellows can be contained in the size of valve body in the past although adopted the sylphon seal structure.In the past, the valve of known employing sylphon seal structure, owing to should strengthen bellows length in this case, so bellows not only can extend to valve body inside quite deeply, and can extend to the inside of valve gap quite deeply.In the embodiment shown in fig. 3, the flow channel shape less with adopting valve opening combines, and only shortens the length of bellows, just can make bellows be contained in the inside of valve body fully.By such structure, the form between valve body 101 and valve gap 106, by packing ring clamping bellows flange 115 can realize sealing, thereby the simple structure that can keep intensity and sealing is provided.It is favourable that the welding that is used to seal should remain on inferior limit.Because welding can reduce intensity, therefore should keep inferior limit.
In the embodiments of figure 3, valve rod 107 is at the upside of sylphon seal structure, promptly in valve gap 106 inside by gland seal 120 sealing, even prevent that with formation foreign matter from invading in the bellows and also can prevent the double sealing structure of gas leakage under the situation of bellows breakage.Valve rod 107 can move up and down by rotation retainer 121 and prevent rotation.If valve rod 107 rotates, then be easy to cause the bellows breakage.
The valve of installing and using in the manufacturing of the halogen corrosive gas of chlorine or fluorine gas etc., consumer device requires to have following characteristic, the invention provides the valve that can satisfy these characteristics.
(a) the halogen corrosive gas to chlorine or fluorine etc. has good anti-corrosion.
It should use the higher material of decay resistance, or carries out surface treatment in order to increase decay resistance, considers price and processability, must select and obtain material and the surface treatment method required with the corrosion resistance balance.Metal fluoride layer of the present invention is particularly conducive to optimizes this characteristic.Sylphon seal structure optimization of the present invention decay resistance.
(b) cut off fully with the outside, do not have external leaks.
There is not the leakage that is caused by the outside in it, reduced air greatly and sneaked into, the external leaks amount as in the current detection device, have the detection boundary of the most high sensitive helium (He) leak detector, must be at 10-12Pam
3Below/second.Described value representation has been guaranteed to seal from the outside under the condition of to-and-fro motion, pressure loading, corrosive atmosphere etc.As described herein, the corrosion resistance of valve body base material is higher, therefore can keep the high leak tightness at goods initial stage for a long time.Owing to adopted sylphon seal, therefore sealing is sufficient.And, because the sylphon seal structure, thus its advantage to be to open and close operation very light.
(c) gas of discharging from the gas flow surface of valve seal structure member, the disengaging of hygroscopic moisture is good.
Its enlightenment that provides is that because therefore the inner fluid (gas liquid) of flowing through wants the gas of ball from the discharge of valve internal surface for having corrosive pressurized gas, the disengaging of hygroscopic moisture should be good.Because chlorine hydrolysis meeting becomes hydrogen cloride.Hydrochloric acid, fluorine gas become fluoric acid, not only can strengthen corrosivity and have impregnability, therefore can accelerated corrosion.Metal fluoride layer of the present invention has this characteristic.
The present invention can provide the valve of optimizing above-mentioned complete characteristic.
Embodiment
Below, though utilize embodiment to be elaborated, the present invention should not be limited among this embodiment.
(formation of no electrolysis Ni-P electroplating film)
In order to utilize the valve of structure and shape shown in Figure 3, carrying out degreasing to forging other structure member that main body that Low temperature steel makes and SUS304 make, and, temperature being increased to 90 ℃ by after the enforcement base pretreatments such as pickling, immersion is adjusted in the electric bath groove of regulation pH value.Carry out the reaction of stipulated time, form the Ni-P electroplating film of 20 μ m thickness on whole surface.It is that so-called chemical nickel is electroplated that no electrolysis Ni-P used herein electroplates, and reality can adopt the medicament of selling on the market of being electroplated by the acidic chemical nickel of hypophosphorous acid chlorine reduction gained.In the present embodiment, used with sodium hypophosphite and electroplated as the chemical nickel of reducing agent, promptly nickel-phosphorus is electroplated the medicament of selling on the market of (Ni-P alloy plating).This medicament is by the metal ingredient NiSO as main component
4(nickelous sulfate) 25g/L, as the NaHPO of reducing agent
2(hypophosphorous acid) 20g/L, complexing agent, stabilizer, glazing agent constitute.
(formation/fluoridation of protective oxide layer)
To form the body of heater inside that parts that Ni-P electroplates are assemblied in normal pressure gas phase flow type reaction furnace, under reduced pressure 200 ℃ are carried out heat treatment in 5 hours and grade with the adsorbed water of discharging the surface.Afterwards, one side imports oxygen (99.999%), and one side is warming up to 400 ℃, keeps this temperature 12 hours with after the forced oxidation metal surface, and one side is utilized nitrogen replacement oxygen, and one side is cooling slowly.
Temperature reaches 350 ℃, begins to import 20% F
2Gas (nitrogen dilution) after replacing fully, kept this state 4 hours, afterwards, carried out surface fluorination.At the appointed time, replace fluorine with nitrogen.Kept this state 1 hour, be cooled to afterwards room temperature measuring thus the film thickness of fluoridizing the passive state body of gained be about 1.5 μ m.
(assembling of valve and test)
Carry out the welding of the structural members such as sylphon seal on the valve base material, described valve base material is formed with on the resulting surface by said method fluoridizes the passive state film, to be assembled into valve shown in Figure 3.
After in this valve being assemblied in chlorine manufacturing pipeline, carry out actual use.In 1 to 3 months continuous use, can not change the initial stage Flow characteristics fully, can not produce fully by valve seat, the leakage that gland portion produces afterwards, in case pull down valve, is disintegrated to it and just can be confirmed inner etch state, does not have evidence of corrosion fully.
As previously discussed, valve of the present invention is as exceedingly useful safety installations, it is violent and have the halogen high pressure manufacturing equipment of toxicity or use in the consumer device to be set at corrosivity such as chlorine or fluorine, and can avoid the leakage of these gases, prevents the corrosion that is caused by gas.
Claims (23)
1. valve, it is provided with valve body and valve gap, described valve body has by the fluid passage of valve body/valve seat from fluid input to fluid output, described valve gap and the assembling of valve body one is characterized in that: have the metallic oxide passive layer that is at least 0.1～5 μ m at the fluid passage of valve body skin covering of the surface thickness with the opening portion of closed fluid passages.
2. valve according to claim 1 is characterized in that: the surface, fluid passage in main body has the nickel protection layer, forms described metal halide passive state protective layer behind this nickel protection film surface of forced oxidation.
3. valve according to claim 1 and 2 is characterized in that: have run through valve gap constitute the valve rod of valve body by the top, valve rod connects the gap that valve gap produces and is sealed by bellows structure.
4. valve according to claim 3 is characterized in that: bellows is made by the corrosion resistant nickel-base alloy and is had a jointless structure.
5. valve according to claim 4 is characterized in that: the bellows that the corrosion resistant nickel-base alloy is made is welded on the bellows link that the corrosion resistant nickel-base alloy is made, and described bellows link is welded on bellows flange and the dish holder.
6. valve according to claim 5 is characterized in that: between valve body and valve gap with fluid sealability ground clamping said flange, thereby finish the aforementioned sealing of valve rod.
7. according to any described valve of claim among the claim 1-6, it is characterized in that: valve prevents the revolution of valve rod by rotary actuator.
8. according to any described valve of claim among the claim 1-7, in valve gap, also has the liner sealing configuration of valve rod.
9. according to any described valve of claim among the claim 1-8, be S font passage by the aforesaid fluid passage of valve body/valve seat from fluid input to fluid output.
10. according to any described valve of claim among the claim 1-9, the aperture of valve should be less than (1/3) * 1.1 of the nominal diameter of valve.
11. according to any described valve of claim among the claim 1-10, valve body is made by low temperature carbon steel and its fluid passage forms by machining at least.
12. according to any described valve of claim among the claim 1-11, valve seat is a soft sealing structure, soft seal is made by teflon.
13. according to any described valve of claim among the claim 1-12, valve is a spherical valve.
14. according to any described valve of claim among the claim 1-12, valve is sluice valve or safety check.
15. according to any described valve of claim among the claim 1-14, it is corrosive gas or liquid that valve is used for halogen.
16. the manufacture method of valve; it is characterized in that: comprise at least forming metal protective film at the valve body substrate surface; by after its surface of oxidation material forced oxidation, make the step of described forced oxidation film and fluorinated gas reaction, and the step that valve body and other valve arrangement spare are linked and packed.
17. the manufacture method of valve according to claim 16 is characterized in that: by nickel or nickel alloy electrolysis or electroless plating formation aforementioned metal protective film.
18. the manufacture method according to claim 16 or 17 described valves is characterized in that: described oxidation material is for containing aerobic, inferior nitrogen oxides, nitrogen peroxide, ozone and contain at least a in the mixed gas of these gases.
19. the manufacture method according to claim 16 or 17 described valves is characterized in that: described oxidation material is the solution that contains nitric acid or hydrogen peroxide.
20. the manufacture method according to claim 16 or 17 described valves is characterized in that: the oxygen of described oxidation material for producing by anodizing, by anode.
21. the manufacture method according to any described valve among the claim 16-20 is characterized in that: aforementioned fluorinated gas is for containing from by the fluorine element at least a gas of selecting in the group that chlorine trifluoride and Nitrogen trifluoride form.
22. manufacture method according to any described valve among the claim 16-21, it is characterized in that: the number of assembling steps that connects the valve arrangement parts contains bellows is welded on the bellows link, this bellows link is welded on the step of bellows flange and dish holder.
23. the manufacture method according to any described valve among the claim 16-22 is characterized in that: valve body is made by low temperature carbon steel, behind the fluid passage by machining formation valve body, forms the aforementioned metal protective film.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17741/2000 | 2000-01-21 | ||
| JP2000017741A JP2001208217A (en) | 2000-01-21 | 2000-01-21 | Valve and its manufacturing method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN1310305A true CN1310305A (en) | 2001-08-29 |
Family
ID=18544696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01112381 Pending CN1310305A (en) | 2000-01-21 | 2001-01-21 | Halogen corrosive gas valve and its producing method |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP2001208217A (en) |
| CN (1) | CN1310305A (en) |
| TW (1) | TW470833B (en) |
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| CN101761689A (en) * | 2008-11-06 | 2010-06-30 | 浙江三花股份有限公司 | Electronic expansion valve using corrugated pipe |
| CN103047441A (en) * | 2012-12-24 | 2013-04-17 | 苏州赛华仪控股份有限公司 | Valve rod for high-temperature high-pressure stop valve and machining method of valve rod |
| WO2018053662A1 (en) * | 2016-09-22 | 2018-03-29 | 沈静静 | Supercritical small diameter corrugated pipe spherical sealing forged shut-off valve |
| CN108506503A (en) * | 2018-04-08 | 2018-09-07 | 江苏圣泰阀门有限公司 | Core shut-off valve |
| CN110832106A (en) * | 2017-08-01 | 2020-02-21 | 中央硝子株式会社 | Method for producing filled container and filled container |
| CN113309858A (en) * | 2021-06-04 | 2021-08-27 | 浙江万龙机械有限公司 | Valve rod high-frequency opening and closing anti-shaking valve for ammonia |
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| CN103883739A (en) * | 2012-12-21 | 2014-06-25 | 江苏明江阀业有限公司 | Corrugated tube stop valve |
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2000
- 2000-01-21 JP JP2000017741A patent/JP2001208217A/en active Pending
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2001
- 2001-01-20 TW TW90101411A patent/TW470833B/en active
- 2001-01-21 CN CN 01112381 patent/CN1310305A/en active Pending
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| CN101761689B (en) * | 2008-11-06 | 2016-07-27 | 浙江三花股份有限公司 | A kind of electric expansion valve using corrugated tube |
| CN103047441A (en) * | 2012-12-24 | 2013-04-17 | 苏州赛华仪控股份有限公司 | Valve rod for high-temperature high-pressure stop valve and machining method of valve rod |
| WO2018053662A1 (en) * | 2016-09-22 | 2018-03-29 | 沈静静 | Supercritical small diameter corrugated pipe spherical sealing forged shut-off valve |
| CN110832106A (en) * | 2017-08-01 | 2020-02-21 | 中央硝子株式会社 | Method for producing filled container and filled container |
| CN110832106B (en) * | 2017-08-01 | 2022-04-15 | 中央硝子株式会社 | Method for producing filled container and filled container |
| US11519557B2 (en) | 2017-08-01 | 2022-12-06 | Central Glass Company, Limited | Method for manufacturing filled container, and filled container |
| CN108506503B (en) * | 2018-04-08 | 2019-02-22 | 江苏圣泰阀门有限公司 | Core shut-off valve |
| CN108506503A (en) * | 2018-04-08 | 2018-09-07 | 江苏圣泰阀门有限公司 | Core shut-off valve |
| CN113547282A (en) * | 2020-04-24 | 2021-10-26 | 温州金波阀门有限公司 | Production process of corrugated pipe assembly |
| CN113547282B (en) * | 2020-04-24 | 2022-07-29 | 温州金波阀门有限公司 | Production process of corrugated pipe assembly |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW470833B (en) | 2002-01-01 |
| JP2001208217A (en) | 2001-08-03 |
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