CN101818817B - Anode protection anticorrosion valve - Google Patents
Anode protection anticorrosion valve Download PDFInfo
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- CN101818817B CN101818817B CN2010101360364A CN201010136036A CN101818817B CN 101818817 B CN101818817 B CN 101818817B CN 2010101360364 A CN2010101360364 A CN 2010101360364A CN 201010136036 A CN201010136036 A CN 201010136036A CN 101818817 B CN101818817 B CN 101818817B
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Abstract
The invention relates to an anode protection anticorrosion valve. A first inner cavity and a second inner cavity, which are communicated with each other, are arranged in the valve body; the valve body is provided with an inlet (a) communicated with the first inner cavity, and an outlet (b) communicated with the second inner cavity; the valve base is arranged on a channel which communicates the first inner cavity and the second inner cavity; a valve clack is arranged in the valve base; the top of the valve body is provided with an upper valve cap, and the bottom is provided with a lower valve cap; bushes are arranged between the valve clack and the upper valve cap and between the valve clack and the lower valve cap; and the external surfaces of the upper shaft and the lower shaft of the valve clack are respectively provided with a cathode sheet. The anode protection anticorrosion valve has the advantages of reasonable design, simple structure, good corrosion resistance, strong adaptability and universality, long service life and the like, and can be used on production equipment and delivery conduits with corrosive liquid.
Description
Technical field
The present invention relates to a kind of valve technology field that is applied in the fluid pipeline, relate in particular to a kind of anticorrosion valve.
Background technique
Valve is as one of main core parts of pressure piping; It is the important component part of pressure piping; Be widely used in essential industry facility and urban lifeline engineerings such as petrochemical industry, combustion gas, metallurgy, electric power, in the development of the national economy and people's activity in production, brought into play important function.Adopt passivating technique at present, the valve that forms the stainless steel-like of anti-corrosion skin covering of the surface at the valve corrosion location is used in a large number.But these control valves still can produce corrosion in various degree, make valve be difficult for opening and closing after the valve corrosion, and particularly passivating film destroys spot corrosion and the local etching that produces; Have influence on sealability, the valve corrosion causes the material waste, increases energy consumption; Cause valve leak; Befouling environment causes taking place casualty accident, threatens safety in production.More than these situation all can bring economic loss in various degree.
At present, in existing patented technology, anticorrosion valve commonly used has following three types mostly:
One type is through the improvement valve mechanism, and minimizing contacts with corrupt liquid.The patent No. is 95117085.6 Chinese invention patent, discloses a kind of leakage-less corrosion-resistant controllable valve, move through magnetic force control clack valve, thereby the closure or openness of control valve is not easy to wear; The patent No. is 90206833.4 Chinese utility model patent; A kind of corrosion-resistant improvement valve is disclosed; Change whole valve rod into upper valve rod and lower valve rod two-part; And will be in seal ring and change with the rotary threaded of upper/lower positions and be put on the upper valve rod, upper valve rod is in the above position of seal ring, improves the valve anti-corrosion capability.
Another kind of is to adopt new corrosion resistant material to improve the anti-corrosion capability of valve.The patent No. is 01141067.1 Chinese invention patent; Disclose a kind of new structure ceramic valve, its valve seat and flap are all processed with stupalith, seal with graphite packing between valve seat and the valve body; And fix by gland, through changing structure and adopting corrosion resistant material to improve the valve anti-corrosion capability; Number of patent application is 200710000292.9 Chinese invention patent, discloses a kind of high temperature resistant corrosion resistant high-strength graphite-carbon composite valve, and valve rod and spool adopt carbon carbon composite to process, and valve seat adopts graphite to process, and realizes anti-corrosion.
Also have one type to be to add lining or the isolated corrupt liquid of coating at valve internal, the patent No. is 90201262.2 Chinese utility model patent, discloses the anticorrosion valve of a kind of cast stone lining, in valve, sets up the cast stone lining and realizes anti-corrosion; The patent No. is 97233920.5 Chinese utility model patent; Disclose a kind ofly high temperature resistantly, anti-wash away, anticorrosion valve; Be transition layer to be set earlier, stupalith and plasticizer or self-melting alloy work lining are set on transition layer at valve gap, body cavity, closure member, valve base surface.
Though above-mentioned patent is in the anti-corrosion capability that has improved valve in varying degrees, all there is narrow limitation in each, and applicability is narrow, versatility is not strong, and the valve antiseptic effect that has is bad.
Summary of the invention
Technical problem to be solved by this invention is to overcome the shortcoming of above-mentioned valve, provide a kind of simple in structure, corrosion resistant performance good, applicability is strong, versatility is good, the anticorrosion valve of the band anodic protection of long service life.
The technical solution that solves the problems of the technologies described above employing is: first inner chamber and second inner chamber that in valve body, are manufactured with mutual UNICOM; Be manufactured with on the valve body with the import a of the first inner chamber UNICOM, with the outlet b of the second inner chamber UNICOM; Valve seat is arranged on the passage of first inner chamber and the second inner chamber UNICOM; Flap is arranged in the valve seat, and the valve body top is provided with bonnet, the bottom is provided with bottom flange, and valve rod is arranged in the bonnet through gland; The gland below sets gradually gland, pressure ring and the support ring that is enclosed within on the valve rod; The valve rod below is provided with flap, is provided with lining between flap and bonnet, the bottom flange, is respectively arranged with cathode sheets on the upper shaft of flap and the outer surface of lower shaft.
Cathode sheets of the present invention has 1-4, and cathode sheets is evenly arranged along the outer surface of flap upper shaft and lower shaft.
Cathode sheets of the present invention is titanium cathode sheets or platinum cathode sheet or stainless steel cathode sheet or carbon steel cathode sheets or cathode sheet or lead electrode sheet or graphite cathode sheet.
Because the present invention has adopted the outer surface in flap upper shaft and lower shaft that cathode sheets evenly is set, and has improved the antiseptic property of flap, has prolonged the working life of valve.The present invention compares with existing valve, has simple in structure, advantages such as corrosion resistant performance good, applicability is strong, versatility is good, long service life reasonable in design, can be used for the valve on corrosion liquid manufacturing mechanism and the conveyance conduit.
Description of drawings
Fig. 1 is the structural representation of one embodiment of the invention.
Fig. 2 is the schematic representation that connects of cathode sheets 10 and valve rod 2 among Fig. 1.
Fig. 3 is the plan view of Fig. 2.
Fig. 4 is a polarization curve before and after 304 passivation for stainless steels.
Embodiment
Below in conjunction with accompanying drawing and embodiment the present invention is explained in further detail, but the invention is not restricted to these embodiments.
Embodiment 1
In Fig. 1,2,3, the anode protection anticorrosion valve of present embodiment is made up of indicator panel 1, valve rod 2, gland 3, gland 4, pressure ring 5, support ring 6, bonnet 7, lining 8, valve body 9, cathode sheets 10, flap 11, valve seat 12, sealing gasket 13, bottom flange 14, plug 15 connections.
In the present embodiment, the tops in the valve body 9 are manufactured with first inner chamber, the bottom is manufactured with second inner chamber, and first inner chamber and second inner chamber link, and are manufactured with on the valve body (9) and the import a of the first inner chamber UNICOM, and the outlet b of the second inner chamber UNICOM.Valve body 9 tops are with the screw threads for fastening coupling bonnet 7 that has been fixedly connected; Valve body 9 bottoms are with the screw threads for fastening coupling bottom flange 14 that has been fixedly connected; Through being threaded plug 15 is installed on the bottom flange 14, between bonnet 7 and bottom flange 14 and the valve body 9 sealing gasket 13 is installed.Valve rod 2 tops are equipped with indicator panel 1 through scyewed joint, and valve rod 2 usefulness screw threads for fastening couplings and gland 3 are installed in the center hole of bonnet 7 and bottom flange 14, are set with gland 4, pressure ring 5, support ring 6 from top to down successively on the gland 3 below valve rods 2.Flap 11 is connected as a single entity with valve rod 2 and is positioned at the bottom of valve rod 2; Between flap 11 and bonnet 7, the bottom flange 14 lining 8 is installed; Valve seat 12 is installed on the UNICOM road between first inner chamber and second inner chamber through scyewed joint; Flap 11 is arranged on the valve seat 12 and can moves along self axis, thereby realizes opening or closing valve.During valve open, import a, first inner chamber are opened through the path of valve seat 12 and second inner chamber and outlet b; During valve closing, path blockade between import a, first inner chamber and second inner chamber and the outlet b.
On the circumferential outer surface of the upper shaft of flap 11 and lower shaft, be welded with 3 cathode sheets 10 respectively; On the upper shaft that cathode sheets 10 also can adopt screw to be connected in to be installed in flap 11 and the circumferential outer surface of lower shaft; 3 cathode sheets 10 evenly distribute along the excircle of flap 11, and promptly the angle between the geometric center lines of the geometric center lines of a slice cathode sheets 10 and adjacent a slice cathode sheets 10 is 120 °.The big I of cathode sheets 10 carries out specifically confirming according to valve internal circulation medium kind, flow and protected valve material; Present embodiment cathode sheets 10 be the graphite cathode sheet; This material has electric conductivity preferably as electrode slices; Cathode sheets 10 also can adopt any one in platinum cathode sheet, stainless steel cathode sheet, carbon steel cathode sheets, cathode sheet, the lead electrode sheet; Specifically select that a kind of cathode sheets for use, should carry out specifically confirming according to the material of medium kind, flow and the protected valve of valve internal circulation.
In order to improve working life of the present invention; With chemistry or electrochemical method passivation is carried out on bonnet 7, bottom flange 14, body cavity, flap 11, valve seat 12 surfaces; Make above-mentioned parts form anti-corrosion skin covering of the surface, valve in use, cathode sheets 10 all is in the liquid with part in the valve flowing channel space; The potential difference of the part in cathode sheets 10 and the valve flowing channel space forms electric current, gives it with protection as the blunt electric current of dimension of keeping the part passivation in the valve flowing channel space.
In the present embodiment, be made into ring and be welded on respectively on the circumferential outer surface of upper shaft and lower shaft of flap 11 being welded with 10,1 cathode sheets 10 of 1 cathode sheets on the circumferential outer surface of the upper shaft of flap 11 and lower shaft respectively.The size of cathode sheets 10 and the cathode sheets of selecting that a kind of material for use can carry out specifically confirming according to valve internal circulation medium kind, flow and protected valve material.The connection of other component and component is identical about embodiment 1.
Embodiment 3
In the present embodiment; On the circumferential outer surface of the upper shaft of flap 11 and lower shaft, be welded with 4 cathode sheets 10 respectively; 4 cathode sheets 10 evenly distribute along the excircle of flap 11, and the angle between the geometric center lines of the geometric center lines of a slice cathode sheets 10 and adjacent a slice cathode sheets 10 is 90 °.The size of cathode sheets 10 and the cathode sheets of selecting that a kind of material for use can carry out specifically confirming according to valve internal circulation medium kind, flow and protected valve material.The connection of other component and component is identical about embodiment 1.
Working principle of the present invention is following:
As shown in Figure 1, valve is in half-open position, and flowing medium gets into first inner chamber of valve body 9 from inlet a, through the annular space of flap 11 with valve seat 12, gets into second inner chamber of valve body 9 and flows out valve from outlet b.In this state, flowing medium is full of whole valve flowing channel space.Upper shaft and the lower shaft that cathode sheets 10 is placed on flap 11 be both sides up and down; The current potential of cathode sheets 10 is higher than all parts in the whole valve flowing channel space: i.e. gland 4, pressure ring 5, support ring 6, bonnet 7, lining 8, valve body 9, flap 11, valve seat 12, bottom flange 14, plug 15; Make above-mentioned parts be in the anodic protection state, do not receive the corrosion of flowing medium.And all component in the whole valve flowing channel of the present invention space all pass through passivation before use, under the high petential effect of cathode sheets 10, are easy to be in the anodic protection state.
Through anodic protection; Make the key position surface of valve internal keep and repair the passivated surface film; The protection valve material does not receive the corrosion of flowing medium; Particularly can reduce passivating film and destroy spot corrosion and the local etching that is produced, increase the anti-impact erosion ability of valve, thereby prolong the working life of valve.
In order to verify beneficial effect of the present invention, the inventor adopts the anode protection anticorrosion valve of the embodiment of the invention 1 preparation to carry out laboratory test, and test situation is following:
Experimental drug: commercially available sodium chloride and potassium chloride (it is pure to be analysis, and Tianjin red rock chemical reagent factory produces); Distilled water: chemical reagent factory in Xi'an produces.
Laboratory apparatus: Corrtest electro-chemical test system, the Central China University of Science and Technology produces; Electrolytic cell, three-electrode electro Chemical test system, reference electrode and auxiliary electrode are saturated calomel electrode, platinum electrode, are produced by Shanghai Russell Science and Technology Ltd..
The preparation sample: 304 stainless steel test pieces, use 400# successively, the 800# liquid honing; The another side bonding wire is drawn lead, and epoxy sealing is used in this face and all the other corners, and experiment is preceding with acetone wiping oil removing; After anhydrous alcohol dewaters; Place exsiccator for use, its specification is Φ 16 * 3mm, and test area is 2.01cm
2304 passivation for stainless steel test pieces: the method with chemical passivation is carried out passivation with above-mentioned treated 304 stainless steel test pieces, with acetone wiping oil removing, after anhydrous alcohol dewaters, places exsiccator for use before the experiment.
Test method: 304 stainless steel test pieces, auxiliary electrode are inserted in the electrolytic cell, and reference electrode is put into the shell type salt bridge.The handshaking procedures of salt bridge is following: earlier solution to be measured is drawn into the outer sleeve of salt bridge and is full of it from the latex mouth of pipe through ear-cleaning ball; Getting the saturated KCl solution of 3mL is injected in the inner sleeve of salt bridge; Reference electrode is inserted with earlier in the latex mouth of pipe, fills in the inner sleeve of salt bridge then together and make it tight; Make interior hole solution unlikely through negative pressure through the leakage of porous core.
304 stainless steel test piece pitting potentials adopt electrokinetic potential scanning polarization curve experiment with measuring method, and probe temperature is 40 ℃, and the employing mass fraction is 3.5% the NaCl aqueous solution.Energized made the instrument preheating 20 minutes before the experiment, and three-electrode system and corrosion test system are connected.Immersing mass fraction to the test face through the polishing sample entirely is 0.5-1cm under 3.5% the NaCl aqueous solution liquid level, places water-bath to keep 40 ℃ of temperature.Place after 10 minutes, treat to begin to carry out zeta potential scanning after sample reaches stable corrosion potential.Open analogue low pass filtering and the digital filtering of potentiostat in being provided with, be set at 20 seconds retard time.Initial potential is-100mV, and the termination current potential is 800mV (homogeneous phase is to OCP), and the speed of scanning is 60mV/min.
The pitting potential that employing electrokinetic potential scanning polarization curve experiment with measuring method is tested 304 passivation for stainless steel test pieces is identical with 304 stainless steel test pieces.
Experimental result:
Reference standard GB/T17899-1999 " stainless steel pitting potential method of measurement " records the pitting potential before and after the passivation for stainless steel, and is as shown in Figure 4.
(1) polarization curve of 304 stainless steel test pieces before and after the passivation listed; Pitting potential before the 304 stainless steel test piece passivation is-6mV; Pitting potential after the passivation is up to 271mV, and the pitting potential after the 304 stainless steel test piece passivation is higher than the pitting potential before the passivation far away.
Passivation region scope before passivation region scope＞passivation after (2) the 304 stainless steel test piece passivation, passivating film plays a very good protection.
The blunt current density of dimension before (3) the 304 stainless steel test piece passivation is 7.45 * 10
-7A/cm
2, the blunt current density of the dimension after the passivation is 1.28 * 10
-7A/cm
2, the blunt current density of dimension after the 304 stainless steel test piece passivation far away＜the blunt current density of dimension before the passivation.
(4) 304 stainless steel test pieces are after passivation, and pitting potential is shuffled, and are that 304 stainless steel test pieces provide bigger potential difference, increased the anodic protection effect of 304 stainless steel test pieces.
Claims (2)
1. anode protection anticorrosion valve; In valve body (9), be manufactured with first inner chamber and second inner chamber of mutual UNICOM; Be manufactured with on the valve body (9) with the import (a) of the first inner chamber UNICOM, with the outlet (b) of the second inner chamber UNICOM; Valve seat (12) is installed on the passage of first inner chamber and the second inner chamber UNICOM through scyewed joint; Flap (11) is arranged on valve seat (12) and goes up and can move along self axis; Valve body (9) top is provided with bonnet (7), the bottom is provided with bottom flange (14), and valve rod (2) is arranged in the bonnet (7) through gland (3), and gland (3) below sets gradually gland (4), pressure ring (5) and the support ring (6) that is enclosed within on the valve rod (2); Described flap (11) and described valve rod (2) are connected as a single entity and are positioned at the bottom of valve rod (2); Be provided with lining (8) between flap (11) and bonnet (7), the bottom flange (14), passivation carried out on bonnet (7), bottom flange (14), body cavity, flap (11), valve seat (12) surface, make above-mentioned parts form anti-corrosion skin covering of the surface with chemistry or electrochemical method; It is characterized in that: be respectively arranged with 1-4 cathode sheets (10) on the upper shaft of said flap (11) and the outer surface of lower shaft, cathode sheets (10) is evenly arranged along the outer surface of flap (11) upper shaft and lower shaft.
2. according to the described anode protection anticorrosion valve of claim 1, it is characterized in that: said cathode sheets (10) is titanium cathode sheets or platinum cathode sheet or stainless steel cathode sheet or carbon steel cathode sheets or cathode sheet or lead electrode sheet or graphite cathode sheet.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101360364A CN101818817B (en) | 2010-03-30 | 2010-03-30 | Anode protection anticorrosion valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010101360364A CN101818817B (en) | 2010-03-30 | 2010-03-30 | Anode protection anticorrosion valve |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101818817A CN101818817A (en) | 2010-09-01 |
| CN101818817B true CN101818817B (en) | 2012-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010101360364A Expired - Fee Related CN101818817B (en) | 2010-03-30 | 2010-03-30 | Anode protection anticorrosion valve |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2124071C1 (en) * | 1997-04-09 | 1998-12-27 | Общество с ограниченной ответственностью "Инженерно-производственный центр" | Method of cathodic protection of valves |
| CN1400036A (en) * | 2001-08-05 | 2003-03-05 | 天华化工机械及自动化研究设计院 | Anode protective acid spreader |
| CN2580218Y (en) * | 2002-11-07 | 2003-10-15 | 陈仕平 | Piston stop valve |
| CN201359099Y (en) * | 2008-12-29 | 2009-12-09 | 营口中通控制设备制造有限公司 | Adjusting valve |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7147768B2 (en) * | 2002-08-15 | 2006-12-12 | Alcan International Limited | Electrochemical scale inhibition |
-
2010
- 2010-03-30 CN CN2010101360364A patent/CN101818817B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| RU2124071C1 (en) * | 1997-04-09 | 1998-12-27 | Общество с ограниченной ответственностью "Инженерно-производственный центр" | Method of cathodic protection of valves |
| CN1400036A (en) * | 2001-08-05 | 2003-03-05 | 天华化工机械及自动化研究设计院 | Anode protective acid spreader |
| CN2580218Y (en) * | 2002-11-07 | 2003-10-15 | 陈仕平 | Piston stop valve |
| CN201359099Y (en) * | 2008-12-29 | 2009-12-09 | 营口中通控制设备制造有限公司 | Adjusting valve |
Non-Patent Citations (2)
| Title |
|---|
| 王训钜等.《阀门的防腐》.《阀门使用维修手册》.中国石化出版社,1999,(第1版),149-150. * |
| 陈鸿海.《阳极保护》.《金属腐蚀学》.北京理工大学出版社,1995,(第1版),294-297. * |
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| CN101818817A (en) | 2010-09-01 |
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Granted publication date: 20120328 Termination date: 20140330 |