CN106641355A - Method for achieving hard sealing of elastic valve combination device - Google Patents
Method for achieving hard sealing of elastic valve combination device Download PDFInfo
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- CN106641355A CN106641355A CN201611140646.5A CN201611140646A CN106641355A CN 106641355 A CN106641355 A CN 106641355A CN 201611140646 A CN201611140646 A CN 201611140646A CN 106641355 A CN106641355 A CN 106641355A
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- bellows
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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
- F16K17/00—Safety valves; Equalising valves, e.g. pressure relief valves
- F16K17/02—Safety valves; Equalising valves, e.g. pressure relief valves opening on surplus pressure on one side; closing on insufficient pressure on one side
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- Engineering & Computer Science (AREA)
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- Mechanical Engineering (AREA)
- Diaphragms And Bellows (AREA)
- Safety Valves (AREA)
Abstract
The invention belongs to the technical field of aviation airborne equipment and particularly relates to a method for achieving hard sealing of an elastic valve combination device. The method mainly includes the steps of grinding of a corrugated pipe cover upper cover sealing surface, corrugated pipe correction, assembly welding of a corrugated pipe and a corrugated pipe cover, assembly welding of a corrugated pipe assembly and a shell, assembly welding of a shell assembly and a shell cover, assembly of an elastic valve assembly, a valve seat and a sealing ring, determining of sealing weld pressure P, sealing weld of a charging opening and the like. The technical bottleneck of hard sealing of the elastic valve combination deice is broken through, the pass percent of the sealing performance of a valve can be increased to 95% or above from 50% or below, and the problem of hard sealing of an elastic valve combination device is completely solved. Compared with the prior art, by means of the technical scheme, the requirement of process control precision of a product is reduced, the process feasibility of implementation is high, and the sealing performance, stability and reliability of the assembled valve are high.
Description
Technical field
The invention belongs to aviation airborne equipment technical field, and in particular to one kind realizes that elastic valve combination body device is firmly close
The method of envelope.
Background technology
Elastic valve combination unit is with flexible members such as bellows, bellows as core component, with other machinery part dress
Valve mounting assembly is combined with welding.The device is installed on aircraft oil system, under certain flying height, bellows
Elastic deformation is produced under interior exocoel differential pressure action, is fitted with mechanism other machinery part, and realized between two laminating parts
Hard sealing.Based on prior art is calculated by elastic theory, by calculating bellows required load in the case where deformation displacement is required, really
Determine the size of bellows exocoel confining pressure, the calculating pressure is enclosed in erection welding, elastic valve is combined the unit one
Determine to realize hard sealing during flying height.Certain displacement is produced in prior art theory by flexible member elastic deformations such as bellowss
Afterwards, elastic valve is promoted to close the device for realizing part firmly sealing, the device design theory is feasible, but technique is when realizing, by ripple
The deformation of line tubular elastic is uneven, the not high factor of the assembling accuracy of form and position affects, and makes valve when bellows produces given displacement, no
Whole laminatings of all sealing surfaces of valve can be realized, so as to the performance that valve closes at a given pressure sealing cannot be met, sternly
Ghost image rings the job stability of oil system.
The content of the invention
Goal of the invention：With reference to the special characteristic of ripple tubular elastic deformation, propose a kind of hard suitable for elastomeric composition body part
The method for realizing the sealing firmly of elastic valve combination body device of sealing, solves the hard sealing problem of such mechanism.
Technical scheme：A kind of method for realizing the sealing firmly of elastic valve combination body device, the elastic valve assembly dress
Put including case lid 1, valve closing chamber 2, bellows cover 3, valve pressure-sensitive chamber 4, bellows 5, operating pressure chamber 6, valve base 7,
Housing 8, seat sealing surface 9, cover seal face 10, pressurising mouth 11, sealing ring 12, the two ends of bellows 5 respectively with bellows cover 3 and housing
8 resistance weldings；Housing 8 and the electron beam welding of case lid 1；The hole axle sliding connection of case lid 1 and bellows cover 3；Valve
Seat 7, by screw assembly connection, is sealed between the two with housing 8 by the circumferencial direction of sealing ring 12, assembles back seat sealing surface 9 with lid
The distance between sealing surface 10 is H, and aircraft, at ground, is maximum HIt is maximum, when flight arrival requires height, with the quilt of bellows 5
Compression, seat sealing surface 9 is fitted with cover seal face 10, now, need to realize valve arrangement by the hard sealing of two laminating part end faces
Sealing；Form valve closing chamber 2 between case lid 1, bellows cover 3, bellows 5 and housing 8, bellows 5, bellows cover 3 and
Valve pressure-sensitive chamber 4 is formed between valve base 7, the cavity inside valve base 7 is operating pressure chamber 6, when H is not 0, operating pressure
Chamber 6 communicates with valve pressure-sensitive chamber 4；When aircraft flight is to predetermined altitude, seat sealing surface 9 is fitted with cover seal face 10 and is realized hard
Sealing, now valve pressure-sensitive chamber 4 connects with the cut-off of operating pressure chamber 6, it is ensured that the pressure in operating pressure chamber 6 is no longer reduced；
To realize the effect above, the method that the sealing firmly of elastic valve combination body device is realized in proposition is comprised the following steps：
S1：The grinding in cover seal face 10 in bellows cover 3：Red copper grinding sleeve bellows cover is used on horizontal high-speed grinding machine
Cover seal face 10 is ground on 3, and roughness reaches more than Ra0.8 precision；
S2：Bellows 5 is corrected：Bellows 5 is corrected so as to which axis is concentric with the mouth of pipe at the two ends of bellows 5；
S3：Bellows 5 and the erection welding of bellows cover 3：It is cylindrical with what bellows 5 coordinated to bellows cover 3, according to ripple
The spout diameter size of pipe 5 carries out reconditioning one by one, coordinates both tight and concentric, subsequently to carrying out electric resistance welding at cooperation
Form combined bellows part；
S4：The combined bellows part that S3 is formed and the erection welding of housing 8：It is cylindrical with lathe clamping housing 8, correct housing 8
Endoporus ensures cylindrical concentric with clamping, mouth of pipe outside dimension of the endoporus coordinated housing 8 and bellows 5 according to bellows 5
Reconditioning one by one is carried out, tight and bellows cover 3 is concentric with according to housing 8 to coordinate the two, subsequently to carrying out Resistance Welding at cooperation
Connect to form housing assembly；
S5：The housing assembly that S4 is formed and the erection welding of case lid 1：In the external coated lubrication of the guide post of case lid 1
Fat and graphite powder, after assembling with bellows cover 3 electron beam weldering is carried out, while carrying out radiating treatment, elastic valve is formed after welding
Component；
S6：The elastic valve component that S5 is formed combines to form elastic valve assembly with valve base 7, the assembling of sealing ring 12；
S7：Determine soldering and sealing pressure P, carry out according to the following steps：
A) test determines PDifference：Slowly pressurizeed by 11 pairs of valve closing chambers 2 of pressurising mouth, while measuring the axle in cover seal face 10
Displacement of the lines, measuring method is to measure the displacement of uniform more than 3 points of the circumferencial direction of sealing surface 10 respectively at the same pressure, individually
Point continues to pressurization after stop of fitting with seat sealing surface 9, until sealing circumferencial direction each point displacement progressively reaches HIt is maximum, and
When each point displacement difference is 0.03mm～0.10mm, stop pressurization, record the pressure P for now applyingDifference, it is relative pressure；
B) soldering and sealing pressure P is calculated：Soldering and sealing pressure P is calculated as follows
P=PDifference+PHigh-altitude
Wherein：PHigh-altitudeIt is aircraft flight to atmospheric pressure during predetermined altitude, is absolute pressure；
S8：The soldering and sealing of pressurising mouth 11：After vacuumizing to valve closing chamber 2, charged pressure is the helium of P, subsequently by pressurising
Mouth 11 is blocked using argon arc welding, completes the hard sealing of elastic valve combination unit.
Beneficial effect：The present invention breaches the hard Sealing Technology bottleneck of the elastic valve combination unit, can be close by valve
Sealing property qualification rate brings up to more than 95% by less than 50%, and the hard sealing for thoroughly solving the elastic valve combination unit is asked
Topic, technical scheme compared with the existing technology, reduces the technology controlling and process required precision of product, technique exploitativeness
By force, the valve sealing property after assembling, stability is strong, reliability is high.
Description of the drawings
Fig. 1 is elastic valve assembly apparatus structure schematic diagram
Wherein, 1- case lids, 2- valve closing chambers, 3- bellows covers, 4- valve pressure-sensitive chamber, 5- bellowss, 6- work pressures
Power chamber, 7- valve bases, 8- housings, 9- seat sealing surfaces, 10- cover seals face, 11- pressurising mouths, 12- sealing rings.
Specific embodiment
Below in conjunction with the accompanying drawings and embodiment is described in further detail to the present invention, Fig. 1 is referred to.
As shown in figure 1, being this method applicable object, elastic valve combination body device, including case lid 1, valve closing chamber
2nd, bellows cover 3, valve pressure-sensitive chamber 4, bellows 5, operating pressure chamber 6, valve base 7, housing 8, seat sealing surface 9, cover seal face
10th, pressurising mouth 11, sealing ring 12, the two ends of bellows 5 respectively with bellows cover 3 and the resistance welding of housing 8；Housing 8 and case lid 1
Electron beam welding；The hole axle sliding connection of case lid 1 and bellows cover 3；Valve base 7 is connected with housing 8 by screw assembling
Connect, sealed by the circumferencial direction of sealing ring 12 between the two, the distance between assembling back seat sealing surface 9 and cover seal face 10 are H, are flown
Machine, at ground, is maximum HIt is maximum, when flight arrival requires height, compressed with bellows 5, seat sealing surface 9 and cover seal face
10 laminatings, now, need to realize that valve arrangement is sealed by the hard sealing of two laminating part end faces；
Valve closing chamber 2, bellows 5, bellows cover 3 are formed between case lid 1, bellows cover 3, bellows 5 and housing 8
And valve pressure-sensitive chamber 4 is formed between valve base 7, and the cavity inside valve base 7 is operating pressure chamber 6, when H is not 0, work pressure
Power chamber 6 communicates with valve pressure-sensitive chamber 4；When aircraft flight is to predetermined altitude, seat sealing surface 9 is fitted and is realized with cover seal face 10
Hard sealing, now valve pressure-sensitive chamber 4 connects with the cut-off of operating pressure chamber 6, it is ensured that the pressure in operating pressure chamber 6 is no longer reduced.It is living
Door seal closed chamber 2 is annular seal space, wherein envelope has the helium of certain pressure, valve pressure-sensitive chamber 4 communicates with air, operating pressure chamber 6 and
Lubricating oil pressure chamber communicates.H shown in Fig. 1 is valve opening, is 0～maximum close apart from HIt is maximum, maximum close is apart from HIt is maximumFor ripple
Mounting distance between lid 3 and valve base 7, is given by structure design.When valve opening H is not closed, i.e., its value is not equal to 0
When, valve pressure-sensitive chamber 4 connects with operating pressure chamber 6, and two cavity pressures are equal.When aircraft rises to certain altitude, valve
Pressure-sensitive chamber 4 is reduced to relevant pressure with atmospheric pressure, and now, valve opening is compressed in the presence of pressure in valve closing chamber 2
Bellows 5 drives bellows cover 3 to move to right, and reduces valve opening H, until the cover seal face 10 in bellows cover 3 and valve base 7
On seat sealing surface 9 fit completely, i.e. H=0 realizes the hard sealing of elastic valve combination unit, blocking valve pressure-sensitive chamber 4
With the passage between operating pressure chamber 6, the pressure of valve pressure-sensitive chamber 4 is set no longer to reduce with the reduced pressure of operating pressure chamber 6, it is ensured that
Normal pressure needed for the lubricating oil pressure chamber connected with valve pressure-sensitive chamber 4.
Realize that the theoretical scheme that above-mentioned elastic valve combination unit is sealed firmly is：By pressurising mouth 11 to valve closing chamber 2
Apply pressure, measuring bellow lid 3 produce displacement, test draw its produce maximum close apart from H it is maximum when desirable pressure PDifference,
By pressure PDifferencePlus the pressure P in the operating pressure chamber 6 boarded a plane when flying height is requiredHigh-altitude, that is, obtaining valve closing chamber 2 needs
The pressure P to be filled with.Then the elastic valve in the charged pressure P of valve closing chamber 2 is combined the unit, and is reached in aircraft and is wanted
During the flying height asked, effect of the bellows cover 3 in valve closing chamber 2 and the pressure reduction P of operating pressure chamber 6 differences is capable of achieving in theory
Under, maximum close is produced apart from H maximum displacement, make two sealing surfaces fit completely, realize the hard sealing of elastic valve combination unit.
Above-mentioned theory scheme actual process implement on, exist following special circumstances cannot meet valve sealing performance will
Ask：One is that cover seal face 10 is not high with the roughness precision of seat sealing surface 9, is unfavorable for the hard sealing with device；Two is to be assembled
Error affects, and cover seal face 10 can not be exactly perpendicularly to the axis of bellows 5 with seat sealing surface 9, when causing two sealing surfaces to be fitted, circle
Circumferential direction gap is uneven and cannot seal；Three circumferencial directions when being 5 elastic deformation of bellows are simultaneously uneven, i.e., when theoretical displacement
Reach maximum close apart from H it is maximum when, the maximum close that circumferencial direction a little can not be entirely reached in cover seal face 10 is apart from H
Maximum, causes cover seal face 10, seat sealing surface 9 to fit completely, it is impossible to realize hard sealing.
Actual process is taken precautions against and considered with reference to above-mentioned theory, in order to thoroughly realize that it is hard close that hard sealing takes following steps to carry out
Envelope：
S1：The grinding in cover seal face 10 in bellows cover 3：Red copper grinding sleeve bellows cover is used on horizontal high-speed grinding machine
Cover seal face 10 is ground on 3, and roughness reaches more than Ra0.8 precision；
S2：Bellows 5 is corrected：Bellows 5 is corrected so as to which axis is concentric with the mouth of pipe at the two ends of bellows 5；
S3：Bellows 5 and the erection welding of bellows cover 3：It is cylindrical with what bellows 5 coordinated to bellows cover 3, according to ripple
The spout diameter size of pipe 5 carries out reconditioning one by one, coordinates both tight and concentric, subsequently to carrying out electric resistance welding at cooperation
Form combined bellows part；
S4：The combined bellows part that S3 is formed and the erection welding of housing 8：It is cylindrical with lathe clamping housing 8, correct housing 8
Endoporus ensures cylindrical concentric with clamping, mouth of pipe outside dimension of the endoporus coordinated housing 8 and bellows 5 according to bellows 5
Reconditioning one by one is carried out, tight and bellows cover 3 is concentric with according to housing 8 to coordinate the two, subsequently to carrying out Resistance Welding at cooperation
Connect to form housing assembly；
S5：The housing assembly that S4 is formed and the erection welding of case lid 1：In the external coated lubrication of the guide post of case lid 1
Fat and graphite powder, after assembling with bellows cover 3 electron beam weldering is carried out, while carrying out radiating treatment, elastic valve is formed after welding
Component；
S6：The elastic valve component that S5 is formed combines to form elastic valve assembly with valve base 7, the assembling of sealing ring 12；
S7：Determine soldering and sealing pressure P, carry out according to the following steps：
A) test determines PDifference：Slowly pressurizeed by 11 pairs of valve closing chambers 2 of pressurising mouth, while measuring the axle in cover seal face 10
Displacement of the lines, measuring method is to measure the displacement of uniform more than 3 points of the circumferencial direction of sealing surface 10 respectively at the same pressure, individually
Point continues to pressurization after stop of fitting with seat sealing surface 9, until sealing circumferencial direction each point displacement progressively reaches HIt is maximum, and
When each point displacement difference is 0.03mm～0.10mm, stop pressurization, record the pressure P for now applyingDifference, it is relative pressure；
A) soldering and sealing pressure P is calculated：Soldering and sealing pressure P is calculated as follows
P=PDifference+PHigh-altitude
Wherein：PHigh-altitudeIt is aircraft flight to atmospheric pressure during predetermined altitude, is absolute pressure；
S8：The soldering and sealing of pressurising mouth 11：After vacuumizing to valve closing chamber 2, charged pressure is the helium of P, subsequently by pressurising
Mouth 11 is blocked using argon arc welding, completes the hard sealing of elastic valve combination unit.
The present invention breaches the hard Sealing Technology bottleneck of the elastic valve combination unit, can be qualified by valve sealing property
Rate brings up to more than 95% by less than 50%, thoroughly solves the hard sealing problem of the elastic valve combination unit, the present invention
Technical scheme compared with the existing technology, reduce the technology controlling and process required precision of product, technique exploitativeness is strong, after assembling
Valve sealing property, stability is strong, reliability is high.
Claims (1)
1. a kind of to realize the method that elastic valve combination body device is sealed firmly, the elastic valve combination body device includes case lid
(1), valve closing chamber (2), bellows cover (3), valve pressure-sensitive chamber (4), bellows (5), operating pressure chamber (6), valve base
(7), housing (8), seat sealing surface (9), cover seal face (10), pressurising mouth (11), sealing ring (12), bellows (5) two ends difference
With bellows cover (3) and housing (8) resistance welding；Housing (8) and case lid (1) electron beam welding；Case lid (1) and bellows
The hole axle sliding connection of lid (3)；Valve base (7), by screw assembly connection, passes through sealing ring with housing (8) between the two
(12) circumferencial direction sealing, the distance between assembling back seat sealing surface (9) and cover seal face (10) are H, and aircraft is at ground
Maximum HIt is maximum, when flight arrival requires height, being compressed with bellows (5), seat sealing surface (9) is fitted with cover seal face (10),
Now, need to realize that valve arrangement is sealed by the hard sealing of two laminating part end faces；Case lid (1), bellows cover (3), ripple
Valve closing chamber (2) is formed between pipe (5) and housing (8), is formed between bellows (5), bellows cover (3) and valve base (7)
Valve pressure-sensitive chamber (4), the internal cavity of valve base (7) is operating pressure chamber (6), operating pressure chamber (6) and living when H is not 0
Door pressure-sensitive chamber (4) is communicated；When aircraft flight is to predetermined altitude, seat sealing surface (9) is fitted with cover seal face (10) and is realized hard
Sealing, now valve pressure-sensitive chamber (4) connects with operating pressure chamber (6) cut-off, it is ensured that the pressure of operating pressure chamber (6) no longer drops
It is low；
To realize the effect above, the method that the sealing firmly of elastic valve combination body device is realized in proposition, it is characterised in that including following
Step：
S1：The grinding of cover seal face (10) in bellows cover (3)：Red copper grinding sleeve bellows cover is used on horizontal high-speed grinding machine
(3) cover seal face (10) are ground on, and roughness reaches more than Ra0.8 precision；
S2：Bellows (5) is corrected：Bellows (5) is corrected so as to which axis is concentric with the mouth of pipe at bellows (5) two ends；
S3：Bellows (5) and bellows cover (3) erection welding：It is cylindrical with what bellows (5) coordinated to bellows cover (3), according to
The spout diameter size of bellows (5) carries out reconditioning one by one, coordinates both tight and concentric, subsequently to carrying out resistance at cooperation
Weldering welding forms combined bellows part；
S4：The combined bellows part that S3 is formed and housing (8) erection welding：It is cylindrical with lathe clamping housing (8), correct housing
(8) endoporus ensures cylindrical concentric with clamping, the mouth of pipe of the endoporus coordinated housing (8) and bellows (5) according to bellows (5)
Outside dimension carries out reconditioning one by one, makes that the two coordinates closely and bellows cover (3) is concentric with according to housing (8), subsequently to cooperation at
Carry out electric resistance welding and form housing assembly；
S5：The housing assembly that S4 is formed and case lid (1) erection welding：In the external coated lubrication of guide post of case lid (1)
Electron beam weldering is carried out after fat and graphite powder, with bellows cover (3) assembling, while carrying out radiating treatment, yielding movable is formed after welding
Door component；
S6：The elastic valve component that S5 is formed combines to form elastic valve assembly with valve base (7), sealing ring (12) assembling；
S7：Determine soldering and sealing pressure P, carry out according to the following steps：
A) test determines PDifference：Valve closing chamber (2) is slowly pressurizeed by pressurising mouth (11), while measuring cover seal face (10)
Axis shift, measuring method is the displacement of uniform more than 3 points of measurement sealing surface (10) circumferencial direction respectively at the same pressure,
Indivedual points continue to pressurization after stop of fitting with seat sealing surface (9), until sealing circumferencial direction each point displacement is progressively reached
HIt is maximum, and each point displacement difference is when being 0.03mm～0.10mm, stops pressurization, records the pressure P that now appliesDifference, it is relative pressure；
B) soldering and sealing pressure P is calculated：Soldering and sealing pressure P is calculated as follows
P=PDifference+PHigh-altitude
Wherein：PHigh-altitudeIt is aircraft flight to atmospheric pressure during predetermined altitude, is absolute pressure；
S8：The soldering and sealing of pressurising mouth (11)：After vacuumizing to valve closing chamber (2), charged pressure is the helium of P, subsequently by pressurising
Mouth (11) is blocked using argon arc welding, completes the hard sealing of elastic valve combination unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611140646.5A CN106641355B (en) | 2016-12-12 | 2016-12-12 | A method of realizing that elastic valve combination body device seals firmly |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201611140646.5A CN106641355B (en) | 2016-12-12 | 2016-12-12 | A method of realizing that elastic valve combination body device seals firmly |
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| Publication Number | Publication Date |
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| CN106641355A true CN106641355A (en) | 2017-05-10 |
| CN106641355B CN106641355B (en) | 2018-11-27 |
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| CN201611140646.5A Active CN106641355B (en) | 2016-12-12 | 2016-12-12 | A method of realizing that elastic valve combination body device seals firmly |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278413A (en) * | 2017-12-22 | 2018-07-13 | 兰州空间技术物理研究所 | A kind of excess pressure valve suitable for the control of space capsule pressure |
| CN109027399A (en) * | 2018-09-19 | 2018-12-18 | 北京航天动力研究所 | High pressure air governor gas valve open in usual |
| CN113107682A (en) * | 2021-04-27 | 2021-07-13 | 中国航发沈阳发动机研究所 | Low-resistance air pressure altitude valve for aero-engine lubricating oil system |
| CN115750094A (en) * | 2022-11-10 | 2023-03-07 | 合肥江航飞机装备股份有限公司 | Pressure regulating valve for bearing cavity of aero-engine and testing method thereof |
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| CN204420295U (en) * | 2014-12-11 | 2015-06-24 | 太原航空仪表有限公司 | A kind of vacuum corrugated pipe realizes the reduction valve that delivery pressure is absolute pressure |
| CN105042124A (en) * | 2015-08-12 | 2015-11-11 | 中国航空工业集团公司西安飞机设计研究所 | Check valve device at end of guiding pipe |
| CN106091010A (en) * | 2016-06-21 | 2016-11-09 | 中国航空工业集团公司沈阳发动机设计研究所 | A kind of engine chamber duplex burner valve |
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| WO2005059326A1 (en) * | 2003-12-16 | 2005-06-30 | Faurecia Systemes D'echappement | Device for sealing the end of a pipe of an exhaust line |
| CN1951619A (en) * | 2005-10-18 | 2007-04-25 | 甘志银 | Vacuum fusion welding packaging method and packaging device |
| CN204420295U (en) * | 2014-12-11 | 2015-06-24 | 太原航空仪表有限公司 | A kind of vacuum corrugated pipe realizes the reduction valve that delivery pressure is absolute pressure |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108278413A (en) * | 2017-12-22 | 2018-07-13 | 兰州空间技术物理研究所 | A kind of excess pressure valve suitable for the control of space capsule pressure |
| CN109027399A (en) * | 2018-09-19 | 2018-12-18 | 北京航天动力研究所 | High pressure air governor gas valve open in usual |
| CN109027399B (en) * | 2018-09-19 | 2024-03-15 | 北京航天动力研究所 | Normally open high-pressure gas control valve |
| CN113107682A (en) * | 2021-04-27 | 2021-07-13 | 中国航发沈阳发动机研究所 | Low-resistance air pressure altitude valve for aero-engine lubricating oil system |
| CN115750094A (en) * | 2022-11-10 | 2023-03-07 | 合肥江航飞机装备股份有限公司 | Pressure regulating valve for bearing cavity of aero-engine and testing method thereof |
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| Publication number | Publication date |
|---|---|
| CN106641355B (en) | 2018-11-27 |
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