CN104405912A - Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process - Google Patents
Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process Download PDFInfo
- Publication number
- CN104405912A CN104405912A CN201410744968.5A CN201410744968A CN104405912A CN 104405912 A CN104405912 A CN 104405912A CN 201410744968 A CN201410744968 A CN 201410744968A CN 104405912 A CN104405912 A CN 104405912A
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- China
- Prior art keywords
- valve
- flat gate
- flashboard
- gate valve
- high pressure
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/02—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor
- F16K3/0263—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing with flat sealing faces; Packings therefor using particular material or covering means
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
-
- C—CHEMISTRY; METALLURGY
- C22—METALLURGY; FERROUS OR NON-FERROUS ALLOYS; TREATMENT OF ALLOYS OR NON-FERROUS METALS
- C22F—CHANGING THE PHYSICAL STRUCTURE OF NON-FERROUS METALS AND NON-FERROUS ALLOYS
- C22F1/00—Changing the physical structure of non-ferrous metals or alloys by heat treatment or by hot or cold working
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/04—Construction of housing; Use of materials therefor of sliding valves
- F16K27/044—Construction of housing; Use of materials therefor of sliding valves slide valves with flat obturating members
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K3/00—Gate valves or sliding valves, i.e. cut-off apparatus with closing members having a sliding movement along the seat for opening and closing
- F16K3/30—Details
- F16K3/314—Forms or constructions of slides; Attachment of the slide to the spindle
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K35/00—Means to prevent accidental or unauthorised actuation
- F16K35/06—Means to prevent accidental or unauthorised actuation using a removable actuating or locking member, e.g. a key
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0008—Mechanical means
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Crystallography & Structural Chemistry (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Valve Housings (AREA)
Abstract
Provided is an incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas. The flat gate valve is provided with a top closing and bottom opening structure, namely when a flashboard is lifted, the flat gate valve is closed, and when the flashboard descends, the flat gate valve is opened. According to the concrete structure of the flat gate valve, the flashboard is provided with an upper flow guiding hole; after the upper end of the flashboard is connected with the lower end of a valve rod through a T-shaped groove, a limiting plate is installed at the joint, and the limiting plate determines the lower limit position of the flat gate valve. The upper sealing surface of the upper end of the valve rod adheres to the sealing surface of the lower portion of a stuffing box to reach the upper limit position of the flat gate valve. The flat gate valve is safely used on the working conditions of CL2500LB.
Description
Technical field
The invention belongs to technical field of valve manufacturing, relate to a kind of for the hard sealed flat gate valve of high pressure under the complex working conditions such as sour nature gas gas field gathering engineering, the hard sealed flat gate valve of a kind of nickel-base alloy anti-sour nature gas high pressure specifically.
Background technique
In the gathering engineering of gas field, anti-high-sulfur high-acidity rock gas high-pressure flat gate valve is the key equipment of engineering system.In this anti-high-sulfur flap type field, only has the carbon steel plate valve of casting both at home and abroad.But because the component of rock gas is (containing saturated steam; H
2the excursion of S content: 12.31%: ~ 17.05%; CO
2the excursion of amount: 7.89% ~ 10.53%; The excursion of Cl content: 28200mg/l ~ 64600mg/l in stratum water water; Virgin gas contains organic sulfur 340.6mg/m
3, wherein: sulphur oxygen carbon 316.2mg/m
3, methyl mercaptan 22.8mg/m
3, ethyl meraptan 1.6mg/m
3; ) in the characteristic of high-sulfur high-acidity, when using under high pressure conditions, carbon steel plate valve exists carbon steel material can produce corrosion cracking in addition, does not meet the problem of medium requirements and makes it use to be subject to great restriction.
Summary of the invention
In order to overcome above-mentioned problems of the prior art, the invention provides the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure and smelting forging process, safe and reliable to operation under the operating mode of high pressure high-sulfur.
For achieving the above object, the technological scheme that the present invention takes is:
The hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure, comprise bottom, valve body, flashboard, valve rod, Stuffing box, seal ring, valve seat, described bottom and valve body lower portion opening are tightly connected, valve seat is arranged in the chamber of valve body, this valve seat and flashboard are equipped with, valve rod one end is connected with flashboard, and the other end is by being connected with drive unit after Stuffing box sealing, and the plate valve safe handling that the described valve body be made up of Incoloy825 alloy is assembled into is under the operating mode of CL2500LB.
Described plate valve has opening structure under shangguan, and when namely flashboard being carried, plate valve is closed, and during decline, plate valve is opened; Concrete structure is: described flashboard has pod apertures, and at this joint mounting limit plate after this flashboard upper end is connected by T-slot with valve rod lower end, this limiting board determines the lower position of plate valve; And the sealing surface laminating of the upper sealing surface of described valve rod upper end and Stuffing box bottom reaches the upper limit position of plate valve.
The described valve rod be in above Stuffing box is provided with instruction screw, and instruction screw is contained on the instruction nut that is installed on valve rod; The stroke up and down of this instruction screw is corresponding with the switch direction board that the outer surface of protecting cover is provided with.
The bonnet place of described plate valve is provided with locking limiting board, pins to prevent misoperation after the handwheel of chain sub-connection locking limiting board and drive unit with lock
The joint of described flashboard and valve rod is provided with anti-static device; The end flange of described valve body is provided with anti-static device.
Described bottom and valve body lower portion opening conical surface seal, built-up welding STL21 on sealing face
#cemented carbide.
Described body base is also provided with drain plug.
Strict controlled forge process technological temperature when forging after described Incoloy825 alloy waters out spindle, first 900 DEG C of preheatings, intensification per hour 20 DEG C of slow heat, after 1000 DEG C ~ 1100 DEG C constant temperature, the initial forging temperature of forging is controlled at 1050 DEG C, final forging temperature controls at 950 DEG C ~ 1050 DEG C, Control for Kiln Temperature can not more than 1150 DEG C, after forging, solutionizing process is carried out to Incoloy825 alloy forged piece, the temperature of solutionizing process controls at 930 DEG C ~ 980 DEG C, and final inspection requires to reach tensile strength of mechanical property σ
b>=586MPa, yield strength σ
0.2>=241MPa, elongation percentage δ>=30%.
Under the present invention is applicable to the complex working conditions such as sour nature gas gas field gathering engineering, the operation that use pressure still can be safe and reliable when CL2500LB.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is the plan view of valve body of the present invention;
Fig. 3 is pod apertures structural representation on flashboard of the present invention;
Fig. 4 is position of the present invention instruction schematic diagram;
Fig. 5 is bottom of the present invention and valve body conical surface seal schematic diagram;
Fig. 6 is limiting board and the electrostatic prevention structure at valve rod position of the present invention;
Fig. 7 is that valve rod of the present invention opens arrival upper limit position schematic diagram;
Fig. 8 is mouth sealing ring structural representation in the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in detail.
As shown in Figure 1, the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure, mainly comprises bottom 1, valve body 2, flashboard 3, limiting board 4, valve rod 5, Stuffing box 6, seal ring 7, instruction nut 8, instruction screw 9, protecting cover 10, viewing window 11, drive unit 12, chain 13, lock 14, locking limiting board 15, anti-static spring 16, antistatic steel ball 17, antistatic plug screw 18, antistatic plug screw pad 19, valve seat 20, drain plug 21.Described bottom 1 and valve body lower portion opening are tightly connected, and valve seat 20 is arranged in the chamber of valve body 2, and this valve seat 20 and flashboard 3 are equipped with, and valve rod 5 one end is connected with flashboard 3, and the other end is connected with drive unit 12 by Stuffing box sealing is rear,
The plate valve safe handling that the described valve body 2 be made up of Incoloy825 (UNS NO8825) (its chemical composition: Fe >=22, Al≤0.20, S≤0.030, Mo≤2.50 ~ 3.50, Ti≤0.60 ~ 1.20, Cu≤1.50 ~ 3.00, Ni≤38.00 ~ 46.00, Cr≤19.50 ~ 23.50, Si≤0.50, Mn≤1.00, C≤0.05) alloy is assembled into is under the operating mode of CL2500LB.This valve body 2 adopts solid forging structure; The relevant regulations of strict implement NACE 0175 " the oil field equipment metallic material of sulfuration resistant stress crack " during smelting forging.
Upper and lower perforate in the middle part of valve body 2, valve seat mouth end face and flashboard guide surface have directly been operated by Linear cut, guarantee that flashboard 3 moves accurately.
Described plate valve has opening structure under shangguan, and when namely flashboard 3 being carried, plate valve is closed, and during decline, plate valve is opened; Concrete structure is: described flashboard 3 has pod apertures (pointing out in Fig. 3), and at this joint mounting limit plate 4 after this flashboard 3 upper end is connected by T-slot with valve rod 5 lower end, this limiting board 4 determines the lower position of plate valve; And the sealing surface 6-1 laminating of the upper sealing surface 5-1 of described valve rod 5 upper end and Stuffing box 6 bottom reaches the upper limit position (see figure 7) of plate valve.After valve rod 5 up two sides laminating, valve rod 5 arrives the highest enable possition, thus reaches the upper limit position of plate valve.
In said structure, flashboard 3 and valve seat 20 form sealing internals, all the time valve seat 20 is not departed from when flashboard 3 is up and down, ensure that the impurity in medium, foul can not enter into sealing surface in valve switch process, there is " automatically cleaning " function, sealing surface is not scratched by impurity, flashboard 3 both sides are all the time in the guide surface (see figure 2) of valve body 1 " slip ", ensure that the reliability of motion, be applicable to level, at right angle setting, not by the restriction of installation direction, and flashboard 3 adopts upper pod apertures structure (see figure 3): when flashboard 3 is carried, valve 1 is closed, during decline, valve 1 is opened.Can make to be attached in medium foul on flashboard 3 when flashboard 3 cuts out, foul is taken away by MEDIA FLOW, and can not fall in valve pocket in a large number.
Middle mouth sealing ring 7 structure is designed with deformation space and distortion groove (see figure 8), after making it produce distortion under cavity pressure effect in valve and between Stuffing box and valve body, all produces good sealing.Stud, nut all surface that A193 B7M/A194 2HM material is made increase Xylan 1424 coating and prevent electrochemical corrosion.
In valve opening process, upper limit is fitted by the upper sealing surface of valve rod 5 and the sealing surface of Stuffing box 6 bottom and is reached, after making it produce distortion under cavity pressure effect in valve and all produce good sealing between Stuffing box and valve body, now can see from viewing window that instruction nut 8 arrives the position of direction board "Off" with instruction screw 9, chain 13 lock 14 pins thus prevents misoperation.In valve closing process, lower limit is encountered plane in valve seat orifice by the limiting board 4 through valve rod 5 and flashboard 3 T-slot and is reached, and the limit method in the past by encountering bottom 1 bottom flashboard 3 of this limit method ratio is more accurate, reliable.Spacing when flashboard 3 drops to fully open position, leave gap between flashboard 3 lower end and bottom 1, bottom does not stress.Original limit method has error due to the impact being subject to bottom 1 sealing gasket, and directly encounter the sealing that bottom 1 can have influence on bottom 1 bottom flashboard 3, bring potential safety hazard, now can see from viewing window that instruction nut 8 arrives the position (see figure 4) of direction board "ON" with instruction screw 9, chain 13 lock 14 pins thus prevents misoperation.
Due to the spark blast that gas medium can produce because of electrostatic, cause the accident, the present invention devises anti-static device, and valve rod 5 lower end part is provided with anti-static spring 16, antistatic steel ball 17(is shown in Fig. 6); Valve flange is provided with antistatic plug screw 18, antistatic plug screw pad 19.The electrostatic of flashboard 3, valve seat location is eventually through valve rod 5 and smallclothes guiding valve body, and valve body guide line between antistatic plug screw 18, antistatic plug screw pad imports the earth.
Conical surface seal (see accompanying drawing 5) is adopted, sealing surface weld deposit STL21 bottom bottom 1 and valve body 2
#cemented carbide, the reliable long service life of sealing structural safety, need not change sealing gasket, once seal leakage can on-line grinding, convenient good operation, not needing to re-use grinding machine processing can reach.And STL21
#the hardness of cemented carbide is used higher and higher, and the performance of sealing is more reliable.
Body base is also provided with drain plug 21, and the dirt bottom valve pocket is discharged by valve removable drain plug 21 when a repair cycle, ensures valve pocket cleaning inside.
Incoloy825 alloy material at present at home, under the operating mode that is not also used in CL2500LB outward.To meet the safe operation under this operating mode, Incoloy825 alloy needs to smelt the qualified alloy of chemical composition in a vacuum furnace, forges after watering out spindle.Forge technological temperature when wanting strict controlled forge process, the control of forging temperature is the key preventing Incoloy825 alloy forged piece from not cracking, and gropes to sum up a set of effective operating procedure through practice.Our first 900 DEG C of preheatings, intensification per hour 20 DEG C of slow heat, after 1000 DEG C ~ 1100 DEG C constant temperature, the initial forging temperature of forging is controlled at 1050 DEG C, final forging temperature controls at 950 DEG C ~ 1050 DEG C, and Control for Kiln Temperature more than 1150 DEG C, can not carry out solutionizing process to Incoloy825 alloy forged piece after forging, the temperature of solutionizing process controls at 930 DEG C ~ 980 DEG C, and final inspection requires to reach tensile strength of mechanical property σ
b>=586MPa, yield strength σ
0.2>=241MPa, elongation percentage δ>=30%.
Claims (8)
1. the hard sealed flat gate valve of Incoloy825 Alloy Anti sour nature gas high pressure, comprise bottom, valve body, flashboard, valve rod, Stuffing box, seal ring, valve seat, described bottom and valve body lower portion opening are tightly connected, valve seat is arranged in the chamber of valve body, this valve seat and flashboard are equipped with, valve rod one end is connected with flashboard, the other end, by being connected with drive unit after Stuffing box sealing, is characterized in that: the plate valve safe handling that the described valve body (2) be made up of Incoloy825 alloy is assembled into is under the operating mode of CL2500LB.
2. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 1, it is characterized in that: described plate valve has opening structure under shangguan, when namely flashboard (3) being carried, plate valve is closed, and during decline, plate valve is opened; Concrete structure is: described flashboard (3) has pod apertures (31), and in this joint mounting limit plate (4) after this flashboard (3) upper end is connected by T-slot with valve rod (5) lower end, this limiting board (4) determines the lower position of plate valve; And sealing surface (6-1) laminating of the upper sealing surface (5-1) of described valve rod (5) upper end and Stuffing box 6 bottom reaches the upper limit position of plate valve.
3. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 1 and 2, it is characterized in that: the described valve rod (5) be in above Stuffing box is provided with instruction screw (9), instruction screw is contained on the instruction nut (8) that is installed on valve rod; The stroke up and down of this instruction screw (9) is corresponding with the switch direction board that the outer surface of protecting cover (10) is provided with.
4. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 3, it is characterized in that: the bonnet place of described plate valve is provided with locking limiting board (15), pin to prevent misoperation with lock (14) after chain (13) connects the handwheel of locking limiting board (15) and drive unit (12).
5. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 1 and 2, is characterized in that: the joint of described flashboard (3) and valve rod (5) is provided with anti-static device; The end flange of described valve body (2) is provided with anti-static device.
6. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 1 and 2, is characterized in that: described bottom (1) and valve body (2) lower openings place conical surface seal, built-up welding STL21 on sealing face
#cemented carbide.
7. the hard sealed flat gate valve of a kind of Incoloy825 Alloy Anti sour nature gas high pressure according to claim 1 and 2, is characterized in that: described valve body (2) bottom is also provided with drain plug (21).
8. the smelting forging process of the hard sealed flat gate valve of Incoloy825 Alloy Anti sour nature gas high pressure, it is characterized in that: strict controlled forge process technological temperature when forging after described Incoloy825 alloy waters out spindle, first 900 DEG C of preheatings, intensification per hour 20 DEG C of slow heat, after 1000 DEG C ~ 1100 DEG C constant temperature, the initial forging temperature of forging is controlled at 1050 DEG C, final forging temperature controls at 950 DEG C ~ 1050 DEG C, Control for Kiln Temperature can not more than 1150 DEG C, after forging, solutionizing process is carried out to Incoloy825 alloy forged piece, the temperature of solutionizing process controls at 930 DEG C ~ 980 DEG C, final inspection requires to reach tensile strength of mechanical property σ
b>=586MPa, yield strength σ
0.2>=241MPa, elongation percentage δ>=30%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744968.5A CN104405912A (en) | 2014-12-09 | 2014-12-09 | Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410744968.5A CN104405912A (en) | 2014-12-09 | 2014-12-09 | Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN104405912A true CN104405912A (en) | 2015-03-11 |
Family
ID=52643563
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410744968.5A Pending CN104405912A (en) | 2014-12-09 | 2014-12-09 | Incoloy825 alloy hard sealing flat gate valve resistant to high pressure of high-sulfur natural gas and forging process |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104405912A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930211A (en) * | 2015-07-06 | 2015-09-23 | 昆山维萨阀门有限公司 | Full-division type single-panel gate valve with reliable limit |
| CN108662239A (en) * | 2018-08-02 | 2018-10-16 | 徐雪兰 | A kind of through-type internal thread self-locking ball valve |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062929A (en) * | 1990-12-30 | 1992-07-22 | 中国科学院金属研究所 | A kind of based on iron nickel and chromium wrought superalloy |
| CN201149099Y (en) * | 2008-01-24 | 2008-11-12 | 兰州高压阀门有限公司 | High-pressure flat plate gate valve |
| CN201401518Y (en) * | 2009-04-09 | 2010-02-10 | 孟广全 | Wear-resistant sulfur-resistant dual-seal plate valve |
| CN202176732U (en) * | 2011-06-16 | 2012-03-28 | 环球阀门集团有限公司 | High-pressure flat sluice valve with diversion hole |
-
2014
- 2014-12-09 CN CN201410744968.5A patent/CN104405912A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1062929A (en) * | 1990-12-30 | 1992-07-22 | 中国科学院金属研究所 | A kind of based on iron nickel and chromium wrought superalloy |
| CN201149099Y (en) * | 2008-01-24 | 2008-11-12 | 兰州高压阀门有限公司 | High-pressure flat plate gate valve |
| CN201401518Y (en) * | 2009-04-09 | 2010-02-10 | 孟广全 | Wear-resistant sulfur-resistant dual-seal plate valve |
| CN202176732U (en) * | 2011-06-16 | 2012-03-28 | 环球阀门集团有限公司 | High-pressure flat sluice valve with diversion hole |
Non-Patent Citations (1)
| Title |
|---|
| 乐敏: "高含硫天然气开采对阀门的特殊要求", 《2011年首届阀门技术研讨会资料汇编》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104930211A (en) * | 2015-07-06 | 2015-09-23 | 昆山维萨阀门有限公司 | Full-division type single-panel gate valve with reliable limit |
| CN108662239A (en) * | 2018-08-02 | 2018-10-16 | 徐雪兰 | A kind of through-type internal thread self-locking ball valve |
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| PB01 | Publication | ||
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Application publication date: 20150311 |