CN107061831A - A kind of Novel work joins valve body moulding - Google Patents
A kind of Novel work joins valve body moulding Download PDFInfo
- Publication number
- CN107061831A CN107061831A CN201710438627.9A CN201710438627A CN107061831A CN 107061831 A CN107061831 A CN 107061831A CN 201710438627 A CN201710438627 A CN 201710438627A CN 107061831 A CN107061831 A CN 107061831A
- Authority
- CN
- China
- Prior art keywords
- runner
- oil groove
- annular oil
- valve body
- hole
- Prior art date
- 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.)
- Granted
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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
- F16K27/00—Construction of housing; Use of materials therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C3/00—Selection of compositions for coating the surfaces of moulds, cores, or patterns
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/08—Features with respect to supply of molten metal, e.g. ingates, circular gates, skim gates
- B22C9/088—Feeder heads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/22—Moulds for peculiarly-shaped castings
- B22C9/24—Moulds for peculiarly-shaped castings for hollow articles
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Molds, Cores, And Manufacturing Methods Thereof (AREA)
- Moulds For Moulding Plastics Or The Like (AREA)
Abstract
Join valve body moulding the invention discloses a kind of Novel work, there are valve core through hole, annular oil groove in the Novel work connection valve body moulding valve body, directly to runner, oblique runner and auxiliary flow, valve body surface has runner mouthful, a valve core through hole is designed with the valve body, several auxiliary flows, there are eight annular oil grooves on valve core through hole, auxiliary flow is for connecting the valve body inner spool through hole, annular oil groove, directly to runner and oblique runner, connect it, the valve body surface has runner mouthful, and runner mouthful is corresponding with each runner in valve body inside and communicates.This valve body advantage is small volume, and reliable in action, function is more, and service life is long.
Description
Technical field
The present invention relates to mechanical engineering field, more particularly to a kind of hydraulic valve casting for being used to control flow direction.
Background technology
Though China is construction machinery production big country at present, industry is big without strong, low-and-medium-grade products production capacity surplus, high-grade liquid
Element almost all dependence on import is pressed, the serious development for lagging behind main frame industry of development of Hydraulic Industry, is equipment as restriction
The main bottleneck of development of manufacturing.At present, China's hydraulic part industry integral fabrication technique level compared with international advanced country still
There is larger gap.
Work connection valve body moulding, be the automatic foundamental element for controlling flow direction, with cut-off, regulation, water conservancy diversion,
The functions such as voltage stabilizing, shunting or overflow pressure relief, with the development and progress of equipment, work connection valve body moulding is high towards integrated level,
Small volume, function is more, life-span length direction development, and exist in valve body moulding casting process spool bore it is curved, it is internal inside contract, casting table
The problem of there is vestige and the low yield rate of chill in face.
In view of this there is provided a kind of small volume, reliable in action, many functions, service life length and quality is good, high yield rate
Novel work joins valve body moulding, is the problem of those skilled in the art need solution.
The content of the invention
In order to solve the above-mentioned technical problem, valve body moulding, the valve body moulding are joined the invention provides a kind of Novel work
Integrated level height, reliable in action, function are more, service life is long.
In order to reach foregoing invention purpose, join valve body moulding, including valve body (1) the invention provides a kind of Novel work,
The valve body (1) is to have valve core through hole (2), annular oil groove inside flat tetragonal body shape, valve body (1), directly to runner, oblique stream
There is runner mouthful on road and auxiliary flow, valve body (1) surface, and the valve core through hole (2) is the sprue of valve body (1), valve core through hole (2)
Provided with eight annular oil grooves, first annular oil groove, the second annular oil groove, the 3rd annular oil groove, fourth annular oil groove, five rings
Shape oil groove, the 6th annular oil groove, the 7th annular oil groove and the 8th annular oil groove, the auxiliary flow are several, for connecting
Valve body (1) the inner spool through hole (2), annular oil groove, straight to runner and oblique runner, the runner mouthful is located at valve body (1)
Each surface on, with valve body (1) inner spool through hole (2), annular oil groove, straight to runner, oblique runner and auxiliary flow pair
Should and it communicate.
Further, the second annular oil groove and the 7th annular oil groove upper end have runner on the valve core through hole (2)
Mouth (3) and runner mouthful (4), oblique runner (5) phase is passed through between the annular oil groove of valve core through hole (2) second and runner mouthful (3)
Connection, is connected between the annular oil groove of valve core through hole (2) the 7th and runner mouthful (4) by oblique runner (6).
Further, valve body (1) left surface is provided with the runner mouthful (7) being connected with the oblique runner (5), described
By being directly connected to runner (8) between oblique runner (5) and runner mouthful (7), valve body (1) right flank be provided with it is described tiltedly
The runner mouthful (9) being connected to runner (6), by being directly connected to runner (10) between the oblique runner (6) and runner mouthful (9)
It is logical, it is described straight to runner (8) and directly parallel with valve core through hole (2) and in the same plane to runner (10).
Further, it is described to be directly provided with annular oil groove (11) to runner (8), it is described to be directly provided with ring to runner (10)
First annular oil groove is connected by auxiliary flow (13) on shape oil groove (12), annular oil groove (11) and valve core through hole (2), annular
Oil groove (12) is connected with the 8th annular oil groove on valve core through hole (2) by auxiliary flow (14), the auxiliary flow (13) and
Auxiliary flow (14) is linear pattern runner.
Further, c-type auxiliary flow is passed through between the 3rd annular oil groove and the 6th annular oil groove on the valve core through hole (2)
Road (15) is connected, and runner mouthful (16) is provided with above the middle of c-type auxiliary flow (15), runner mouthful (16) is on valve body (1)
Surface, by being directly connected to runner between the runner mouthful (16) and c-type auxiliary flow (15).
Further, fourth annular oil groove lower end is provided with runner mouthful (17) on the valve core through hole (2), and runner mouthful (17) exists
Valve body (1) lower surface, by being directly connected to runner (18) between the fourth annular oil groove and runner mouthful (17).
Further, it is described directly to runner (18) from top to bottom provided with two annular oil grooves, it is followed successively by straight to runner (18)
First annular oil groove and the second annular oil groove, the 6th ring on the second annular oil groove and valve core through hole (2) on line flowing channel (18)
Shape oil groove is connected by c-type auxiliary flow (19).
Specifically, the valve body is by casting and being integrally formed.
The Novel work connection valve body moulding of the present invention, small volume, reliable in action, function are more, service life is long.
What the present invention was achieved through the following technical solutions：A kind of Novel work connection valve body moulding casting technique, including coremaking,
Shell processed, moulding, cast, it is characterised in that：
1) artificial sand is used in coremaking, the cold drawn light circles of Φ 3mm is added and does arbor, artificial sand intensity is high, it is ensured that yielding
The intensity of runner core, adds drawing light circle and does the intensity that arbor ensure that core main aperture, core will not after molten iron enters die cavity
Deformation, is effectively guaranteed the linearity and cast-internal dimensional accuracy of runner.
2) remove side chill in cast and be changed to side gate top riser pouring technology, rising head uses Φ 90mm using rising head
Heat preservation rising head, can be good at serving feeding effect, and solve cast(ing) surface chill mark problem so that casting into
Product rate reaches more than 93%.
3) core manufacturing craft parameter is：Arenaceous shell uses common precoated sand, 280-310 DEG C of heating-up temperature；Shooting pressure >=
0.5MPa；Shooting time 3-6 seconds；Hardening time 40-60 second；Core uses HACER80,250-280 DEG C of heating-up temperature；Penetrate sand pressure
Power >=0.5MPa；Shooting time 2-5 seconds；Hardening time 30-50 second；Coating on core uses blacking, using leaching Tu
Mode, coating concentration is Baume degrees 9-11,180-220 DEG C of coating drying temperature, soaking time 30-50min；
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the accompanying drawing used required in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
The front view for the work connection valve body moulding that Fig. 1 provides for the present invention.
The left view for the work connection valve body moulding that Fig. 2 provides for the present invention.
The top view for the work connection valve body moulding that Fig. 3 provides for the present invention.
The A-A directions sectional view for the work connection valve body moulding that Fig. 4 provides for the present invention.
The B-B directions sectional view for the work connection valve body moulding that Fig. 5 provides for the present invention.
The C-C directions sectional view for the work connection valve body moulding that Fig. 6 provides for the present invention.
The D-D directions sectional view for the work connection valve body moulding that Fig. 7 provides for the present invention.
The E-E directions sectional view for the work connection valve body moulding that Fig. 8 provides for the present invention.
Wherein, reference is corresponded in figure：1- valve bodies, 2- valve core through hole, 3- runners mouthful, 4- runners mouthful, the oblique streams of 5-
Road, the oblique runners of 6-, 7- runners mouthful, 8- is directly to runner, 9- runners mouthful, and 10- is directly to runner, 11- annular oil grooves, 12- annular oil
Groove, 13- auxiliary flows, 14- auxiliary flows, 15-C type auxiliary flows, 16- runners mouthful, 17- runners mouthful, 18- is directly to runner, 19-
C-type auxiliary flow.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation is described, it is clear that described embodiment is only a part of embodiment of the invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art obtained on the premise of creative work is not made it is all its
His embodiment, belongs to the scope of protection of the invention.
In the description of the embodiment of the present invention, it is to be understood that term " on ", " under ", " top ", " bottom ", " interior ", " outer "
Deng instruction orientation or position relationship be based on orientation shown in the drawings or position relationship, be for only for ease of description the present invention and
Simplify description, rather than indicate or imply that the device or element of meaning there must be specific orientation, with specific orientation structure
Make and operate, therefore be not considered as limiting the invention.In the description of the embodiment of the present invention, " multiple " are meant that two
Individual or two or more, unless otherwise specifically defined, in addition, term " comprising " and " having " and their any change
Shape, it is intended that covering is non-exclusive to be included.
Embodiment：
The embodiment of the present invention is described with reference to the drawings, as shown in figure 1, the work joins valve body moulding, including valve
Body 1, the valve body 1 is to have valve core through hole 2, annular oil groove in flat tetragonal body shape, the valve body 1, directly to runner, oblique stream
Road, runner mouth and auxiliary flow, the valve core through hole 2 is the sprue of valve body 1, and described is directly valve to runner and oblique runner
The runner that internal portion is communicated with valve body surface runner mouth, the auxiliary flow is several, for connecting in the main body of valve body 1
It is portion's valve core through hole 2, annular oil groove, straight to runner and oblique runner, connect it, the runner mouthful is located at each of valve body 1
On individual surface, with the inner spool through hole 2 of valve body 1, annular oil groove, it is straight to runner, oblique runner and auxiliary flow it is corresponding and
It is connected.
Specifically, there are eight annular oil grooves on the valve core through hole 2 from left to right, respectively valve core through hole 2 is first annular
Oil groove, the second annular oil groove, the 3rd annular oil groove, fourth annular oil groove, the 5th annular oil groove, the 6th annular oil groove, the 7th ring
Shape oil groove and the 8th annular oil groove, each annular oil groove are communicated with valve core through hole 2.
Further, the second annular oil groove and the 7th annular oil groove upper end have runner on the valve core through hole (2)
Mouth (3) and runner mouthful (4), oblique runner (5) phase is passed through between the annular oil groove of valve core through hole (2) second and runner mouthful (3)
Connection, is connected between the annular oil groove of valve core through hole (2) the 7th and runner mouthful (4) by oblique runner (6).
Further, valve body (1) left surface is provided with the runner mouthful (7) being connected with the oblique runner (5), described
By being directly connected to runner (8) between oblique runner (5) and runner mouthful (7), valve body (1) right flank be provided with it is described tiltedly
The runner mouthful (9) being connected to runner (6), by being directly connected to runner (10) between the oblique runner (6) and runner mouthful (9)
It is logical, it is described straight to runner (8) and directly parallel with valve core through hole (2) and in the same plane to runner (10).
Further, it is described to be directly provided with annular oil groove (11) to runner (8), it is described to be directly provided with ring to runner (10)
First annular oil groove is connected by auxiliary flow (13) on shape oil groove (12), annular oil groove (11) and valve core through hole (2), annular
Oil groove (12) is connected with the 8th annular oil groove on valve core through hole (2) by auxiliary flow (14), the auxiliary flow (13) and
Auxiliary flow (14) is linear pattern runner.
Further, c-type auxiliary flow is passed through between the 3rd annular oil groove and the 6th annular oil groove on the valve core through hole (2)
Road (15) is connected, and runner mouthful (16) is provided with above the middle of c-type auxiliary flow (15), runner mouthful (16) is on valve body (1)
Surface, by being directly connected to runner between the runner mouthful (16) and c-type auxiliary flow (15).
Further, fourth annular oil groove lower end is provided with runner mouthful (17) on the valve core through hole (2), and runner mouthful (17) exists
Valve body (1) lower surface, by being directly connected to runner (18) between the fourth annular oil groove and runner mouthful (17).
Further, it is described directly to runner (18) from top to bottom provided with two annular oil grooves, it is followed successively by straight to runner (18)
First annular oil groove and the second annular oil groove, the 6th ring on the second annular oil groove and valve core through hole (2) on line flowing channel (18)
Shape oil groove is connected by c-type auxiliary flow (19).
Specifically, the valve body is by casting and being integrally formed.
The Novel work connection valve body moulding of the present invention, small volume, reliable in action, function are more, service life is long.
A kind of key technology during Novel work connection valve body moulding casting：Including coremaking, shell processed, moulding, cast, its feature
It is：
1) shell uses resin-coated sand shell mould technique, and main core uses the gold artificial sand coremaking of jade-like stone B590US, adds Φ 3mm cold drawn
Light circle does arbor, and artificial sand intensity is high, it is ensured that the intensity of yielding runner core, adds drawing light circle and does arbor and ensure that core master
The intensity in hole, core will not be deformed after molten iron enters die cavity, be effectively guaranteed the linearity and cast-internal size of runner
Precision.
2) remove side chill in cast and be changed to side gate top riser pouring technology, rising head uses Φ 90mm using rising head
Heat preservation rising head, can be good at serving feeding effect, and solve cast(ing) surface chill mark problem so that casting into
Product rate reaches more than 93%.
3) core manufacturing craft parameter is：Arenaceous shell uses common precoated sand, 280-310 DEG C of heating-up temperature；Shooting pressure >=
0.5MPa；Shooting time 3-6 seconds；Hardening time 40-60 second；Core uses HACER80,250-280 DEG C of heating-up temperature；Penetrate sand pressure
Power >=0.5MPa；Shooting time 2-5 seconds；Hardening time 30-50 second；Coating on core uses blacking, using leaching Tu
Mode, coating concentration is Baume degrees 9-11,180-220 DEG C of coating drying temperature, soaking time 30-50min；
Novel work connection valve casts the important technological parameters of valve body：
1) material：QT450-10
2) tensile strength：≥450Mpa
3) hardness：HBW160-210
4) design size requirement is met
5) without casting flaws such as burning into sand, stomata, shrinkage cavity and porosities, inner chamber is without defects such as scab, fash
6) casting list amount：10.2kg
The Novel work connection valve body moulding of the present invention, has the advantages that：Rational in infrastructure, small volume, reliable in action,
Function is more, and casting qualification rate is greatly improved.
What the above was uncovered is only presently preferred embodiments of the present invention, can not limit the right of the present invention with this certainly
Scope, therefore the equivalent variations made according to the claims in the present invention, still fall within the scope that the present invention is covered.
Claims (9)
1. a kind of Novel work joins valve body moulding, including valve body (1), it is characterised in that have inside valve body (1) valve core through hole (2),
Annular oil groove, straight to runner, oblique runner and auxiliary flow, valve body (1) surface is provided with runner mouthful, the valve core through hole (2)
The sprue of valve body (1), valve core through hole (2) is provided with first annular oil groove, the second annular oil groove, the 3rd annular oil groove, the 4th
Annular oil groove, the 5th annular oil groove, the 6th annular oil groove, the 7th annular oil groove and the 8th annular oil groove, the auxiliary flow is
Several, for connecting the valve body (1) inner spool through hole (2), annular oil groove, directly to runner and oblique runner, the stream
Road junction is located on each surface of valve body (1), with valve body (1) inner spool through hole (2), annular oil groove, directly to runner, oblique stream
Road is corresponding with auxiliary flow and communicates.
2. Novel work according to claim 1 joins valve body moulding, it is characterised in that second on the valve core through hole (2)
Annular oil groove and the 7th annular oil groove upper end have runner mouthful (3) and runner mouthful (4), the ring of valve core through hole (2) second
It is connected between shape oil groove and runner mouthful (3) by oblique runner (5), the annular oil groove of valve core through hole (2) the 7th and runner
It is connected between mouth (4) by oblique runner (6).
3. Novel work according to claim 2 joins valve body moulding, it is characterised in that valve body (1) left surface is provided with
The runner mouthful (7) being connected with the oblique runner (5), by directly to runner between the oblique runner (5) and runner mouthful (7)
(8) it is connected, valve body (1) right flank is provided with the runner mouthful (9) being connected with the oblique runner (6), the oblique stream
It is described straight to runner (8) and straight to runner (10) and valve by being directly connected to runner (10) between road (6) and runner mouthful (9)
Core through hole (2) is parallel and in the same plane.
4. Novel work according to claim 3 joins valve body moulding, it is characterised in that described to be directly provided with to runner (8)
Annular oil groove (11), it is described straight to be provided with annular oil groove (12), annular oil groove (11) and valve core through hole (2) the to runner (10)
One annular oil groove is connected by auxiliary flow (13), and the 8th annular oil groove passes through on annular oil groove (12) and valve core through hole (2)
Auxiliary flow (14) is connected, and the auxiliary flow (13) and auxiliary flow (14) are linear pattern runner.
5. Novel work according to claim 1 joins valve body moulding, it is characterised in that the 3rd on the valve core through hole (2)
It is connected between annular oil groove and the 6th annular oil groove by c-type auxiliary flow (15), on the middle of c-type auxiliary flow (15)
Fang Kaiyou runners mouthful (16), runner mouthful (16) in valve body (1) upper surface, the runner mouthful (16) and c-type auxiliary flow (15) it
Between by being directly connected to runner.
6. Novel work according to claim 1 joins valve body moulding, it is characterised in that the 4th on the valve core through hole (2)
Annular oil groove lower end is provided with runner mouthful (17), and runner mouthful (17) is in valve body (1) lower surface, the fourth annular oil groove and runner mouthful
(17) by being directly connected to runner (18) between.
7. Novel work according to claim 6 joins valve body moulding, it is characterised in that described straight to runner (18) from up to
Two annular oil grooves are had, straight first annular oil groove and the second annular oil groove to runner (18), line flowing channel is followed successively by
(18) the second annular oil groove is connected with the 6th annular oil groove on valve core through hole (2) by c-type auxiliary flow (19) on.
8. the Novel work connection valve body moulding according to any one in claim 1-7, it is characterised in that the valve body
(1) by casting and being integrally formed.
9. a kind of Novel work joins valve body processing technology, including coremaking, moulding, cast and cleaning, it is characterised in that following steps：
1) artificial sand coremaking is used in coremaking, the cold drawn light circles of Φ 3mm are put in core and do arbor, for ensureing valve inner runner
Linearity；
2) in cast, using side gate top riser pouring technology, rising head uses Φ 90mm heat preservation rising heads, for solving casting
Problem and cast(ing) surface chill mark problem are inside contracted inside part.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438627.9A CN107061831B (en) | 2017-06-12 | 2017-06-12 | Novel valve body foundry goods is allied oneself with in work |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710438627.9A CN107061831B (en) | 2017-06-12 | 2017-06-12 | Novel valve body foundry goods is allied oneself with in work |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107061831A true CN107061831A (en) | 2017-08-18 |
| CN107061831B CN107061831B (en) | 2023-05-02 |
Family
ID=59594875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710438627.9A Active CN107061831B (en) | 2017-06-12 | 2017-06-12 | Novel valve body foundry goods is allied oneself with in work |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107061831B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109261905A (en) * | 2018-09-13 | 2019-01-25 | 南通华东油压科技有限公司 | A kind of type core manufacturing valve body |
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|---|---|---|---|---|
| JPH10184968A (en) * | 1996-12-26 | 1998-07-14 | Hitachi Constr Mach Co Ltd | Valve housing structure and its manufacture |
| CN101373027A (en) * | 2008-08-08 | 2009-02-25 | 锦州市力特缸泵阀液压制造有限公司 | Multi-way change valve |
| CN105772643A (en) * | 2016-05-12 | 2016-07-20 | 南通华东油压科技有限公司 | Casting technology of directional control valve |
| CN106001460A (en) * | 2016-07-22 | 2016-10-12 | 南通华东油压科技有限公司 | High-pressure valve body casting |
| CN206000797U (en) * | 2016-08-31 | 2017-03-08 | 山东泰丰液压股份有限公司 | Total power self-adaptation type load-sensitive multiple directional control valve |
| CN207213275U (en) * | 2017-06-12 | 2018-04-10 | 南通华东油压科技有限公司 | A kind of Novel work joins valve body moulding |
-
2017
- 2017-06-12 CN CN201710438627.9A patent/CN107061831B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH10184968A (en) * | 1996-12-26 | 1998-07-14 | Hitachi Constr Mach Co Ltd | Valve housing structure and its manufacture |
| CN101373027A (en) * | 2008-08-08 | 2009-02-25 | 锦州市力特缸泵阀液压制造有限公司 | Multi-way change valve |
| CN105772643A (en) * | 2016-05-12 | 2016-07-20 | 南通华东油压科技有限公司 | Casting technology of directional control valve |
| CN106001460A (en) * | 2016-07-22 | 2016-10-12 | 南通华东油压科技有限公司 | High-pressure valve body casting |
| CN206000797U (en) * | 2016-08-31 | 2017-03-08 | 山东泰丰液压股份有限公司 | Total power self-adaptation type load-sensitive multiple directional control valve |
| CN207213275U (en) * | 2017-06-12 | 2018-04-10 | 南通华东油压科技有限公司 | A kind of Novel work joins valve body moulding |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109261905A (en) * | 2018-09-13 | 2019-01-25 | 南通华东油压科技有限公司 | A kind of type core manufacturing valve body |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107061831B (en) | 2023-05-02 |
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