CN117450270A - Breather valve sealing mechanism and breather valve - Google Patents
Breather valve sealing mechanism and breather valve Download PDFInfo
- Publication number
- CN117450270A CN117450270A CN202311149311.XA CN202311149311A CN117450270A CN 117450270 A CN117450270 A CN 117450270A CN 202311149311 A CN202311149311 A CN 202311149311A CN 117450270 A CN117450270 A CN 117450270A
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- Prior art keywords
- smooth surface
- valve
- roughness
- breather valve
- breather
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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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/36—Valve members
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
- B65D90/32—Arrangements for preventing, or minimising the effect of, excessive or insufficient pressure
- B65D90/34—Venting means
-
- 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
- F16K1/00—Lift valves or globe valves, i.e. cut-off apparatus with closure members having at least a component of their opening and closing motion perpendicular to the closing faces
- F16K1/32—Details
- F16K1/34—Cutting-off parts, e.g. valve members, seats
- F16K1/42—Valve seats
-
- 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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/18—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on either side
- F16K17/19—Equalising valves predominantly for tanks
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The invention relates to the technical field of breather valves, in particular to a breather valve sealing mechanism and a breather valve. The breather valve sealing mechanism and the breather valve seal when the valve disc and the valve seat are attached to each other by the smooth portion.
Description
Technical Field
The invention relates to the technical field of breather valves, in particular to a breather valve sealing mechanism and a breather valve.
Background
The existing breather valve adopts polytetrafluoroethylene as a sealing surface: usually, the sealing surface is turned on the edge of a round plate, and polytetrafluoroethylene similar to a flange gasket is sleeved.
The polytetrafluoroethylene sealing surface has the defects of rough surface, low elasticity, easy scratch, deformation, poor sealing effect and the like, and the sealing effect is continuously reduced along with the accumulation of the service time and the number of take-off, so that the condition is caused by the fact that after each take-off, the seat returning position of the sealing surface cannot be kept consistent, and the previous closed indentation becomes a leakage point of a new sealing surface; and moreover, due to poor polytetrafluoroethylene coating property and relatively rough processing technology, and due to the fact that the material characteristics of the polytetrafluoroethylene coating type valve disc and the polytetrafluoroethylene valve seat are easy to deform in the processing process, the mechanical fitness of the valve disc and the polytetrafluoroethylene valve seat is poor, and the overall sealing effect is finally poor due to the fact that the factors are combined. To this end, the invention provides a breather valve sealing mechanism and a breather valve.
Disclosure of Invention
The invention is provided in view of the problem that the existing breather valve has poor mechanical anastomosis degree of a valve disc and a valve seat.
Therefore, one of the purposes of the invention is to provide a breather valve sealing mechanism, which improves the sealing effect of a breather valve.
In order to solve the technical problems, the invention provides the following technical scheme: a respiratory valve sealing mechanism comprising a smooth portion that is a contact location between a valve disc and a valve seat.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the smooth portion includes a first smooth surface disposed on the valve disc or a second smooth surface disposed on the valve seat.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the smooth part comprises a first smooth surface on the valve disc and a second smooth surface on the valve seat;
the first smooth surface and the second smooth surface are matched and sealed.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the roughness of the first smooth surface is 0.001-0.393 mu m, and the roughness of the second smooth surface is 0.001-0.393 mu m.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the difference between the inner diameter and the outer diameter of the contact area of the second smooth surface and the first smooth surface is 1-6.5 mm.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the roughness of the first smooth surface is 0.001-0.134 mu m, and the roughness of the second smooth surface is 0.001-0.077 mu m.
As a preferable mode of the breather valve sealing mechanism of the invention, wherein: the first smooth surface roughness was 0.032 μm and the second smooth surface roughness was 0.032 μm.
The breather valve sealing mechanism has the beneficial effects that: the smooth portion seals when the valve disk and the valve seat are in contact with each other.
Another object of the present invention is to provide a breather valve, which aims at: the leakage amount of the oil tank is reduced.
In order to solve the technical problems, the invention provides the following technical scheme: a breather valve comprises a sealing mechanism and also comprises,
the mounting unit comprises a shell, a vent arranged at the side edge in the shell, a connecting port at the bottom end, and a connecting hole;
the ventilation unit comprises an air inlet channel and an air outlet channel which are arranged in the shell, and a switch component which is respectively arranged in the air inlet channel and the air outlet channel and is provided with a smooth part.
As a preferred embodiment of the breather valve of the present invention, wherein: the switch assembly comprises a valve seat and a mounting shaft which are arranged in the shell, and a valve disc which is arranged in the mounting shaft and matched with the valve seat.
As a preferred embodiment of the breather valve of the present invention, wherein: the valve seat is mounted in the housing by an interference fit.
The invention has the beneficial effects that: the switch component with the smooth part is arranged in the shell, so that the sealing effect of the air inlet channel and the air outlet channel can be enhanced, and leakage is reduced.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art. Wherein:
fig. 1 is a schematic view of the overall structure of the breather valve seal mechanism of the present invention.
Fig. 2 is a schematic view of a first smooth surface structure of the breather valve seal mechanism of the present invention.
FIG. 3 is a schematic view of a second smooth surface of the sealing mechanism of the breather valve of the present invention.
Fig. 4 is a schematic diagram of the overall structure of the breather valve of the present invention.
Fig. 5 is a schematic diagram of a switch assembly of the breather valve of the present invention.
Detailed Description
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, but the present invention may be practiced in other ways other than those described herein, and persons skilled in the art will readily appreciate that the present invention is not limited to the specific embodiments disclosed below.
Further, reference herein to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic can be included in at least one implementation of the invention. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or alternative embodiments mutually exclusive of other embodiments.
Further, in describing the embodiments of the present invention in detail, the cross-sectional view of the device structure is not partially enlarged to a general scale for convenience of description, and the schematic is only an example, which should not limit the scope of protection of the present invention. In addition, the three-dimensional dimensions of length, width and depth should be included in actual fabrication.
Embodiment 1 referring to fig. 1 to 3, for the first embodiment of the present invention, there is provided a breather valve sealing mechanism comprising a smooth portion M which is a contact portion provided between a valve disc 203c and a valve seat 203a, and the valve disc 203c and the valve seat 203a are sealed by the smooth portion M after being contacted.
Wherein the smooth portion M comprises a first smooth surface M-1 arranged on the valve disc 203c or a second smooth surface M-2 arranged on the valve seat 203 a;
when the valve disc 203c is provided with the first smooth surface M-1, the roughness of the first smooth surface M-1 is 0.001-0.393 mu M, and then a sealing ring or a sealing gasket can be arranged on the valve seat 203a and is contacted and sealed; roughness is the degree of surface roughness of an object;
or when the second smooth surface M-2 is provided on the valve seat 203a, the roughness is 0.001 μm to 0.393 μm, and a seal ring or gasket may be provided on the valve disk 203c, and the contact seal is performed by both.
Embodiment 2, referring to fig. 1 to 3, is a second embodiment of the present invention, which is different from the first embodiment in that:
the smooth portion M includes a first smooth surface M-1 on the valve disk 203c and a second smooth surface M-2 on the valve seat 203a, and when the valve disk 203c and the valve seat 203a are in contact, the first smooth surface M-1 and the second smooth surface M-2 are in contact with each other to seal.
Further, the roughness of the first smooth surface M-1 is 0.001 μm to 0.393 μm, and the surface is polished to a mirror-level roughness to be in contact with the second smooth surface M-2 for sealing.
Further, the roughness of the second smooth surface M-2 is 0.001 μm to 0.393 μm, and the mirror surface roughness is achieved by grinding in the same way, so that the sealing effect is improved.
When the valve disc 203c and the valve seat 203a are abutted against each other in use, the first smooth surface M-1 and the second smooth surface M-2 are abutted against each other, and the both surfaces are bonded to each other to seal.
Embodiment 3 referring to fig. 1 to 3, a third embodiment of the present invention is different from the second embodiment in that: the roughness of the first smooth surface M-1 is 0.001-0.134 mu M, and the roughness of the second smooth surface M-2 is 0.001-0.077 mu M.
When the valve disc 203c and the valve seat 203a are abutted against each other in use, the first smooth surface M-1 and the second smooth surface M-2 are abutted against each other, and the both surfaces are bonded to each other to seal.
Embodiment 4, referring to fig. 1 to 3, is a fourth embodiment of the present invention, which is different from the third embodiment in that: the roughness of the first smooth surface M-1 is 0.032 mu M, and the roughness of the second smooth surface M-2 is 0.032 mu M.
When the valve disc 203c and the valve seat 203a are abutted against each other in use, the first smooth surface M-1 and the second smooth surface M-2 are abutted against each other, and the both surfaces are bonded to each other to seal.
Respiratory valve leakage detection:
analysis of leakage results by varying roughness of the contact surface of the breather valve disc 203c and the valve seat 203a, the unit of the roughness leakage amount is m 3 The results of the roughness versus leakage for examples 2-4 are shown in Table 1 when the breathing valve specification used for the test is DN 300/10';
(roughness is ground by a special grinding device, errors occur in grinding, and the average value of a plurality of groups of grinding data is currently taken
Table 1: DN150 respiratory valve leakage test (Unit: m) 3 /h)
From the results (table 1), it can be seen that the leakage value is proportional to the surface roughness value of the contact surface, and the smoother the contact surface, the lower the leakage amount. The sealing effect is best when the roughness of the first smooth surface M-1 is 0.032 μm or 0.001 μm and the roughness of the second smooth surface M-2 is 0.032 μm or 0.001 μm. Preferably, the combination of the contact surfaces of the first smooth surface M-1 and the second smooth surface M-2 with the roughness of 0.032 mu M is adopted, and the leakage value test can be stabilized at 0.0005 mu M 3 /h。
Table 2: DN300 breather valve leakage test (Unit: m 3 /h)
From the results (table 2), it can be seen that the leakage amount is proportional to the surface roughness value of the contact surface, and the smoother the contact surface, the lower the leakage amount. When the roughness of the first smooth surface M-1 is 0.032 μm or 0.001 μm and the roughness of the second smooth surface M-2 is 0.032 μm or 0.001 μmThe sealing effect is best. Preferably, the combination of the contact surfaces of the first smooth surface M-1 and the second smooth surface M-2 with the roughness of 0.032 mu M is adopted, and the leakage value test can be stabilized at 0.0011 mu M 3 /h。
Table 3: leakage discharge requirement of breathing valve in various countries
As shown in (table 3):
the specification of the breather valve is less than or equal to 150mm, and the requirements of the national petroleum and natural gas industry standard (SY/T05011.1-2010) on the leakage amount are not higher than 0.04m 3 /h; international standard (ISO 28300/API 2000) this number is not higher than 0.142m 3 The standard of European country is not higher than 0.0017m 3 /h；
The specification of the breather valve with DN being more than or equal to 200 and less than or equal to 400mm, and the standard (SY/T05011.1-2010) of the leakage amount in China is not higher than 0.4m 3 The ISO 28300/API 2000 standard is not higher than 0.1416m 3 The standard of European country is not higher than 0.003m 3 /h。
Test conclusion:
(1) the surface roughness of the valve disk 203c and the valve seat 203a of DN150 specification is preferably controlled to be 0.032 mu m, reaching the fine mirror finish grade of 10K stainless steel, and the leakage is 0.0005m 3 /h, far below the minimum leakage of 0.0017m in Europe and the like 3 Criteria of/h.
(2) The surface optimized roughness of the valve disc 203c and the valve seat 203a with DN300 specification is controlled to be 0.032 mu m, the grade of fine mirror polishing of 10K stainless steel is reached, and the leakage quantity is 0.0011m 3 /h, far below the minimum leakage of 0.0030m in Europe and the like 3 Criteria of/h.
Embodiment 5 referring to fig. 1 to 3, a fifth embodiment of the present invention is different from the fourth embodiment in that: processing oblique angles in the second smooth surface M-2 or the first smooth surface M-1, reducing the area of the second smooth surface M-2 or the first smooth surface M-1, enabling the second smooth surface M-2 or the first smooth surface M-1 to be reduced, specifically enabling the difference between the inner diameter and the outer diameter of the contact part area to be 1-6.5 mm,
only one of the smooth surfaces is changed, when the valve disc 203c is tripped each time, the valve disc 203c does not return to the original position, the first smooth surface M-1 and the second smooth surface M-2 are ensured not to be staggered after the valve disc 203c is tripped, and the tightness is ensured.
The rest of the structure is the same as that of embodiment 2.
Embodiment 6 referring to fig. 1 to 5, for a sixth embodiment of the present invention, there is provided a breather valve: the sealing mechanism comprises a sealing mechanism, a mounting unit 100 and a ventilation unit 200, wherein the mounting unit 100 is connected with the tank body, and the ventilation unit 200 controls the pressure inside the tank body and prevents leakage of the tank body;
the installation unit 100 comprises a shell 101, a vent 102 and a connecting port 103, wherein the vent 102 is arranged on the side edge in the shell 101, and the connecting port 103 is arranged at the bottom end of the shell 101;
a ventilation unit 200 including an air inlet channel 201 and an air outlet channel 202 provided in the housing 101, and a switch assembly 203 provided in the air inlet channel 201 and the air outlet channel 202, respectively, and equipped with a smooth portion M;
the switch assembly 203 includes a valve seat 203a and a mounting shaft 203b provided in the housing 101, and a valve disc 203c provided in the mounting shaft 203b and engaged with the valve seat 203 a;
wherein, the bottom ends of the air inlet channel 201 and the air outlet channel 202 are communicated with the connecting port 103, the top end is communicated with the ventilation opening 102, the top end of the air inlet channel 201 is positioned above the air outlet channel 202, and the jumping direction of the valve disc 203c is consistent and jumps along the upper part of the connecting port 103;
during the use process: the casing 101 is mounted on the tank body, when the pressure inside the tank body is high, gas enters the air inlet channel 201 and the air outlet channel 202 from the connection port 103, and the valve disc 203c in the air outlet channel 202 is jacked up, discharged from the ventilation opening 102, and the pressure is balanced; when the pressure inside the tank is small, gas enters from the vent 102, lifts the valve disk 203c in the intake passage 201, and enters the tank from the intake passage 201, thereby balancing the pressure.
Embodiment 7 referring to fig. 1 to 5, a seventh embodiment of the present invention is different from the sixth embodiment in that: the valve seat 203a is arranged in the shell 101 through interference fit, when the shell 101 is processed, a valve seat 203a installation part is reserved, the shell can be integrally cast and molded, and the valve disc 203c and the valve seat 203a are separately processed and the smooth part M is ground;
during installation, the valve disc 203c is matched with the installation shaft 203b through a nut for installation and fixation, the valve seat 203a is frozen through liquid nitrogen and then is installed at a reserved part of the shell 101, and when the temperature returns to room temperature, the valve seat 203a is firmly inlaid on the valve body to complete fixation.
The rest of the structure is the same as that of embodiment 4.
It should be noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that the technical solution of the present invention may be modified or substituted without departing from the spirit and scope of the technical solution of the present invention, which is intended to be covered in the scope of the claims of the present invention.
Claims (10)
1. A breather valve sealing mechanism, its characterized in that: comprising the steps of (a) a step of,
a smooth portion (M) which is a contact portion between the valve disc (203 c) and the valve seat (203 a).
2. The breather valve seal mechanism of claim 1, wherein: the smooth portion (M) includes a first smooth surface (M-1) provided on the valve disk (203 c) or a second smooth surface (M-2) provided on the valve seat (203 a).
3. The breather valve seal mechanism of claim 1, wherein: the smooth part (M) comprises a first smooth surface (M-1) on the valve disc (203 c) and a second smooth surface (M-2) on the valve seat (203 a);
the first smooth surface (M-1) and the second smooth surface (M-2) are matched and sealed.
4. A breather valve seal mechanism according to claim 3, wherein: the roughness of the first smooth surface (M-1) is 0.001-0.393 mu M, and the roughness of the second smooth surface (M-2) is Ra 0.001-0.393 mu M.
5. The breather valve seal mechanism according to any one of claims 2 to 4, wherein: the difference between the inner diameter and the outer diameter of the contact area of the second smooth surface (M-2) and the first smooth surface (M-1) is 1-6.5 mm.
6. The breather valve seal mechanism of claim 4, wherein: the roughness of the first smooth surface (M-1) is 0.001-0.134 μm, and the roughness of the second smooth surface (M-2) is 0.001-0.077 μm.
7. The breather valve seal mechanism of claim 6, wherein: the roughness of the first smooth surface (M-1) is 0.032 μm, and the roughness of the second smooth surface (M-2) is 0.032 μm.
8. A breather valve, characterized by: comprising the sealing mechanism of claim 7, further comprising,
the mounting unit (100) comprises a shell (101), a vent (102) and a connecting port (103) at the bottom end, which are arranged on the side edge in the shell (101), and;
the ventilation unit (200) comprises an air inlet channel (201) and an air outlet channel (202) which are arranged in the shell (101), and a switch assembly (203) which is respectively arranged in the air inlet channel (201) and the air outlet channel (202) and is provided with the smooth part (M).
9. The respiratory valve of claim 8, wherein: the switch assembly (203) includes a valve seat (203 a) and a mounting shaft (203 b) disposed in the housing (101), and a valve disc (203 c) disposed in the mounting shaft (203 b) and mated with the valve seat (203 a).
10. The respiratory valve of claim 9, wherein: the valve seat (203 a) is mounted in the housing (101) by an interference fit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149311.XA CN117450270A (en) | 2023-09-07 | 2023-09-07 | Breather valve sealing mechanism and breather valve |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311149311.XA CN117450270A (en) | 2023-09-07 | 2023-09-07 | Breather valve sealing mechanism and breather valve |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117450270A true CN117450270A (en) | 2024-01-26 |
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ID=89586260
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311149311.XA Pending CN117450270A (en) | 2023-09-07 | 2023-09-07 | Breather valve sealing mechanism and breather valve |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117450270A (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2154081Y (en) * | 1993-06-07 | 1994-01-26 | 郑红 | Anti-explosive, anti-fire respirtory valve |
| US20100065059A1 (en) * | 2004-02-13 | 2010-03-18 | Koninklijke Philips Electronics N.V. | Hybrid textured/polished respiratory mask seal and respiratory mask using same |
| CN213064774U (en) * | 2020-09-18 | 2021-04-27 | 抚顺丰业石化机械制造有限公司 | Fire-retardant breather valve |
| CN114427618A (en) * | 2020-09-23 | 2022-05-03 | 中国石油化工股份有限公司 | All-weather burning-resistant breather valve device |
-
2023
- 2023-09-07 CN CN202311149311.XA patent/CN117450270A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2154081Y (en) * | 1993-06-07 | 1994-01-26 | 郑红 | Anti-explosive, anti-fire respirtory valve |
| US20100065059A1 (en) * | 2004-02-13 | 2010-03-18 | Koninklijke Philips Electronics N.V. | Hybrid textured/polished respiratory mask seal and respiratory mask using same |
| CN213064774U (en) * | 2020-09-18 | 2021-04-27 | 抚顺丰业石化机械制造有限公司 | Fire-retardant breather valve |
| CN114427618A (en) * | 2020-09-23 | 2022-05-03 | 中国石油化工股份有限公司 | All-weather burning-resistant breather valve device |
Non-Patent Citations (1)
| Title |
|---|
| 华鹏 等: ""安全阀阀座与阀瓣研磨修复工艺实验研究"", 《表面技术》, vol. 46, no. 8, 20 August 2017 (2017-08-20), pages 280 - 285 * |
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