CN113600748A - MCJ04A guide cross valve body casting - Google Patents
MCJ04A guide cross valve body casting Download PDFInfo
- Publication number
- CN113600748A CN113600748A CN202110766082.0A CN202110766082A CN113600748A CN 113600748 A CN113600748 A CN 113600748A CN 202110766082 A CN202110766082 A CN 202110766082A CN 113600748 A CN113600748 A CN 113600748A
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- flow channel
- flow
- flow passage
- main body
- designed
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- 238000005266 casting Methods 0.000 title claims abstract description 26
- 230000008520 organization Effects 0.000 abstract 1
- 238000007493 shaping process Methods 0.000 abstract 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical group O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 22
- 239000004576 sand Substances 0.000 description 12
- 238000005553 drilling Methods 0.000 description 9
- 244000035744 Hura crepitans Species 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 238000005452 bending Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 229910052742 iron Inorganic materials 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000006004 Quartz sand Substances 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000003044 adaptive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 238000010791 quenching Methods 0.000 description 1
- 230000000171 quenching effect Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 230000003746 surface roughness Effects 0.000 description 1
- 230000002194 synthesizing effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/02—Sand moulds or like moulds for shaped castings
-
- 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
- B22C9/082—Sprues, pouring cups
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22C—FOUNDRY MOULDING
- B22C9/00—Moulds or cores; Moulding processes
- B22C9/10—Cores; Manufacture or installation of cores
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B13/00—Details of servomotor systems ; Valves for servomotor systems
- F15B13/02—Fluid distribution or supply devices characterised by their adaptation to the control of servomotors
- F15B13/021—Valves for interconnecting the fluid chambers of an actuator
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Valve Housings (AREA)
Abstract
The invention relates to an MCJ04A pilot cross valve body casting, which comprises a first flow passage, a second flow passage, a third flow passage, a fourth flow passage, a fifth flow passage, a sixth flow passage, a seventh flow passage, an eighth flow passage, a first auxiliary flow passage, a second auxiliary flow passage, a butterfly flow passage, a rectangular flow passage and a main body, wherein four flow passages are designed at four corners of the upper end of the main body, the fifth flow passage is positioned at the central positions of the four flow passages, and the rectangular flow passage is designed at the upper middle position in the main body; a sixth flow passage is designed in the middle of the lower end of the main body, a butterfly flow passage is designed in the middle of the inner part of the main body at a lower position, and the upper end of the sixth flow passage is communicated with the center position of the lower end of the butterfly flow passage; a seventh flow channel is arranged on the left side of the sixth flow channel in parallel, and the upper end of the seventh flow channel is communicated with the butterfly flow channel through the first auxiliary flow channel; an eighth flow channel is arranged on the rear side of the sixth flow channel in parallel, and the upper end of the eighth flow channel is communicated with the rear side of the rectangular flow channel through a second auxiliary flow channel. The advantage is that the project organization is reasonable, is convenient for cast, and the runner shaping precision is high, satisfies the market demand.
Description
Technical Field
The invention relates to the technical field of valve body castings, in particular to an MCJ04A pilot cross valve body casting.
Background
In order to meet the requirements of Chinese engineering machinery products on the functions of a hydraulic system and continuously improve the stability and the automation control degree and meet the requirements of east Anhui overflow limited companies, the MCJ04A cross-shaped control lever pilot valve is independently developed for matched host factories. The oil inlet and outlet control of the traditional reversing valve is carried out through one valve core, the corresponding relation of the openings of the two oil ports is determined as early as the design and processing of the valve core, and the corresponding relation cannot be modified in the using process, so that the flow or the pressure of the two oil ports cannot be independently controlled, and the two oil ports do not influence each other. Due to the flexibility of control of the two oil ports by reversing the double valve core, the two oil ports can respectively adopt flow control, pressure control or flow pressure control. Flexible control, compliance with market demands and great development prospect. Because the integration of function, a valve body becomes multi-functional from single function, consequently requires the inner structure of valve body more complicated, has increased the casting degree of difficulty of product blank, must solve a series of casting difficult problems. Because of the particularity of the product structure, the product blank only has 2.0KG, but the internal flow channel is many, and the hole is little, so how to exhaust, loam core intensity scheduling problem must be solved.
Disclosure of Invention
The MCJ04A pilot cross valve body casting provided by the invention is reasonable in design structure, convenient to cast and high in runner forming precision.
The technical scheme of the invention is as follows:
the MCJ04A guide cross valve casting comprises a first flow passage, a second flow passage, a third flow passage, a fourth flow passage, a fifth flow passage, a sixth flow passage, a seventh flow passage, an eighth flow passage, a first auxiliary flow passage, a second auxiliary flow passage, a butterfly flow passage, a rectangular flow passage and a main body, wherein four flow passages are designed at four corners of the upper end of the main body, the four flow passages are respectively a first flow passage, a second flow passage, a third flow passage and a fourth flow passage, the fifth flow passage is designed in the middle of the upper end of the main body, the fifth flow passage is positioned at the center of the four flow passages, the first flow passage, the second flow passage, the third flow passage, the fourth flow passage and the fifth flow passage are designed in parallel, the upper ends of the first flow passage, the second flow passage, the third flow passage, the fourth flow passage and the fifth flow passage are communicated with the upper end surface of the main body, a rectangular flow passage is designed at an upper middle upper position inside the main body, and the lower ends of the first flow passage, the second flow passage, the third flow passage and the fourth flow passage are communicated with the rectangular flow passage, the lower end of the fifth flow channel extends into the upper part of the rectangular flow channel and is not communicated with the rectangular flow channel; a sixth flow passage is designed in the middle of the lower end of the main body, a butterfly flow passage is designed in the middle of the inner part of the main body and in a downward position, the upper end of the sixth flow passage is communicated with the central position of the lower end of the butterfly flow passage, and the lower end of the sixth flow passage is communicated with the lower end face of the main body; a seventh flow channel is arranged on the left side of the sixth flow channel in parallel, the upper end of the seventh flow channel is communicated with the left position of the butterfly flow channel through the first auxiliary flow channel, and the lower end of the seventh flow channel is communicated with the lower end face of the main body; the rear side of the sixth runner is provided with an eighth runner in parallel, the upper end of the eighth runner is communicated with the rear side of the rectangular runner through a second auxiliary runner, and the lower end of the eighth runner is communicated with the lower end face of the main body.
The main body is designed into a rectangular body, and trapezoidal bulges are respectively designed at the rear side, the left side and the lower middle position of the rectangular body; the right side design of main part has two circular cone recesses, and two circular cone recesses are close to the upper and lower both ends of main part respectively.
The first runner, the second runner, the third runner, the fourth runner, the fifth runner, the sixth runner, the seventh runner and the eighth runner are all designed into cylindrical runners.
The first auxiliary runner and the second auxiliary runner are both designed into arc-shaped cylindrical runners.
The butterfly-shaped flow channel is formed by inwards arching a triangular bulge at the front side and the rear side of a rectangular flow channel.
The invention has the advantages of reasonable design structure, convenient casting, high runner forming precision and capability of meeting the market demand.
Drawings
Fig. 1 is a front view of the present invention.
Fig. 2 is a top view of the present invention.
Fig. 3 is a bottom view of the present invention.
Fig. 4 is a rear view of the present invention.
Fig. 5 is a cross-sectional view along AA in fig. 2.
Fig. 6 is a cross-sectional view taken along line BB in fig. 2.
Fig. 7 is a sectional view taken along line CC in fig. 6.
Fig. 8 is a sectional view taken along line DD in fig. 6.
Fig. 9 is a sectional view taken along direction EE in fig. 6.
Fig. 10 is a sectional view taken along direction FF in fig. 6.
Fig. 11 is a sectional view taken in the direction of HH in fig. 6.
Detailed Description
Referring to the attached drawings 1-11, an MCJ04A pilot cross valve casting includes a first flow channel 1, a second flow channel 2, a third flow channel 3, a fourth flow channel 4, a fifth flow channel 5, a sixth flow channel 6, a seventh flow channel 7, an eighth flow channel 8, a first auxiliary flow channel 9, a second auxiliary flow channel 10, a butterfly flow channel 11, a rectangular flow channel 12 and a main body 13, four flow channels are designed at four corners of the upper end of the main body 13, the four flow channels are respectively a first flow channel 1, a second flow channel 2, a third flow channel 3 and a fourth flow channel 4, a fifth flow channel 5 is designed in the middle of the upper end of the main body 13, the fifth flow channel 5 is located at the center of the four flow channels, the first flow channel 1, the second flow channel 2, the third flow channel 3, the fourth flow channel 4 and the fifth flow channel 5 are designed in parallel to each other, and the upper ends of the first flow channel 1, the second flow channel 2, the third flow channel 3, the fourth flow channel 4 and the fifth flow channel 5 are communicated with the upper end surface of the main body 13, a rectangular flow channel 12 is designed at the upper middle position in the main body 13, the lower ends of the first flow channel 1, the second flow channel 2, the third flow channel 3 and the fourth flow channel 4 are communicated with the four corners of the rectangular flow channel 12, and the lower end of the fifth flow channel 5 extends into the upper part of the rectangular flow channel 12 and is not communicated with the rectangular flow channel 12; a sixth flow channel 6 is designed in the middle of the lower end of the main body 13, a butterfly flow channel 11 is designed in the middle of the inside of the main body 13, the upper end of the sixth flow channel 6 is communicated with the center position of the lower end of the butterfly flow channel 11, and the lower end of the sixth flow channel 6 is communicated with the lower end face of the main body 13; a seventh flow channel 7 is arranged on the left side of the sixth flow channel 6 in parallel, the upper end of the seventh flow channel 7 is communicated with the left position of the butterfly flow channel 11 through the first auxiliary flow channel 9, and the lower end of the seventh flow channel 7 is communicated with the lower end face of the main body 13; an eighth flow channel 8 is arranged on the rear side of the sixth flow channel 6 in parallel, the upper end of the eighth flow channel 8 is communicated with the rear position of the rectangular flow channel 12 through a second auxiliary flow channel 10, and the lower end of the eighth flow channel 8 is communicated with the lower end face of the main body 13.
The main body 13 is designed into a rectangular body 14, and trapezoidal bulges 15 are respectively designed at the rear side, the left side and the lower middle position of the rectangular body 14; the right side of the main body 13 is designed with two conical grooves 16, and the two conical grooves 16 are respectively close to the upper end and the lower end of the main body 13. The middle-upper position on the left side of the rectangular body 14 is designed with an arc-shaped groove, and the right side of the rectangular body 14 is designed with an arc-shaped groove.
The first flow channel 1, the second flow channel 2, the third flow channel 3, the fourth flow channel 4, the fifth flow channel 5, the sixth flow channel 6, the seventh flow channel 7 and the eighth flow channel 8 are all designed to be cylindrical flow channels.
The first auxiliary runner 9 and the second auxiliary runner 10 are both designed to be arc-shaped cylindrical runners.
The butterfly-shaped flow passage 11 is formed by simultaneously and inwards arching a triangular bulge at the front side and the rear side of a rectangular flow passage.
In the production process of the valve body casting, a cavity in a sand box is manufactured according to the appearance of a product, a runner core is designed according to the runner structure of the product, the runner core is placed in the cavity which is appointed to be placed in the sand box, the sand box is closed, molten iron is poured into the sand box from a reserved casting head, after the sand box is cooled, the sand box is opened, the valve body casting is taken out, the inner core is cleaned and led out, and the valve body casting is finished.
Because the flow passage structure of the inner cavity of the valve body casting is complex, the sand core cannot be formed at one time, and the production requirement of the product cannot be met by the traditional casting process, the shell and the sand core are comprehensively assembled, and then the sand core is provided with the vent needle and drilled with the exhaust hole to be led out, so that the exhaust effect of the inner cavity is improved. The mud core adopts precoated sand with high strength and low gas evolution. The sand core is thicker at the central part of the runner and wraps the middle of the casting, so that the exhaust is difficult, and the product is easy to generate air holes and bubbles. The sand core has no direct core head to lead out exhaust, so the exhaust is led out by adopting a grafting method. The sand core part of the butterfly-shaped runner and the sand core part of the rectangular runner are pre-buried with a cross-shaped vent needle respectively during core making, the vent needle is drawn out after molding to form a cross-shaped air hole, a first runner 1, a second runner 2, a third runner 3 and a fourth runner 4 are drilled along the axis from the end part and are communicated with the four corners of the cross-shaped air hole of the sand core part of the rectangular runner, and a sixth runner 6 is drilled along the axis from the end part and is communicated with the intersection of the cross-shaped air hole of the sand core part of the butterfly-shaped runner.
Drilling an exhaust hole tool: in order to reduce air holes and solve the problem of air exhaust of a mud core, the mud core is small and only has the diameter of 6mm, and the common air exhaust hole drilling method is easy to drill the mud core through, drill the mud core to break and drill molten iron, so that a set of air exhaust hole drilling tool is developed, the mud core can be integrally placed into the tool, the verticality of drilling is controlled by using a central hole of a drilling guide sleeve, and the depth of drilling is controlled by using the length of the drilling guide sleeve (the length of a drill bit is unchanged). The success rate of the mud core drilling is greatly improved, and the problems of gas generation of the mud core and air holes of a casting are solved.
Adopting high-strength low-gas-generation precoated sand: the traditional precoated sand adopts quartz sand as a main raw material, and has the defects of phase change expansion generated at high temperature, poor angular coefficient, large resin addition amount and large gas evolution. The precoated sand is prepared by artificially synthesizing sand from raw sand, so that the raw sand is round in shape and small in surface area, the addition of resin can be reduced by 30%, the bending strength of the precoated sand can reach more than 12MPa, the gas evolution of the precoated sand is greatly reduced, and the problems of pores and strength of castings are solved.
The molding process adopts a method of automatic line shakeout, wherein the automatic line shakeout firstly uses precoated sand to crust, then the automatic line is adaptive to molding, and finally the shell falls into an automatic line type cavity, so that the precoated sand shell improves the surface roughness of a product, and the automatic line molding improves the compactness of the cavity to prevent a runner from deforming and breaking due to appearance expansion.
Performance indexes of the valve body casting are as follows:
the weight of the valve body is as follows: 2.0 KG.
The material requirement is as follows: HT 300.
Graphite morphology: and (B) type A.
Graphite grade: 4-6 grades.
The hardness requirement is as follows: HB 200-240.
Drilling an exhaust hole tool:
materials: an aluminum plate.
A guide sleeve: and (4) quenching 45# steel.
Precoated sand:
normal temperature tensile strength: not less than 1.8 MPa.
Normal temperature bending strength: not less than 8.8 MPa.
Gas forming amount: less than or equal to 20 ml/g.
Claims (5)
- The MCJ04A pilot cross valve body casting is characterized by comprising a first flow channel, a second flow channel, a third flow channel, a fourth flow channel, a fifth flow channel, a sixth flow channel, a seventh flow channel, an eighth flow channel, a first auxiliary flow channel, a second auxiliary flow channel, a butterfly flow channel, a rectangular flow channel and a main body, wherein four flow channels are designed at four corners of the upper end of the main body, the four flow channels are respectively the first flow channel, the second flow channel, the third flow channel and the fourth flow channel, the fifth flow channel is designed in the middle of the upper end of the main body, the fifth flow channel is positioned in the center of the four flow channels, the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the fifth flow channel are designed in parallel, the upper ends of the first flow channel, the second flow channel, the third flow channel, the fourth flow channel and the fifth flow channel are communicated with the upper end face of the main body, the rectangular flow channel is designed in the middle of the main body, and the first flow channel, the second flow channel, the third flow channel, the fourth flow channel, the main body and the main body are connected with the upper end face of the main body, The lower end of the fourth flow channel is communicated with the four corners of the rectangular flow channel, and the lower end of the fifth flow channel extends into the upper part of the rectangular flow channel and is not communicated with the rectangular flow channel; a sixth flow passage is designed in the middle of the lower end of the main body, a butterfly flow passage is designed in the middle of the inner part of the main body and in a downward position, the upper end of the sixth flow passage is communicated with the central position of the lower end of the butterfly flow passage, and the lower end of the sixth flow passage is communicated with the lower end face of the main body; a seventh flow channel is arranged on the left side of the sixth flow channel in parallel, the upper end of the seventh flow channel is communicated with the left position of the butterfly flow channel through the first auxiliary flow channel, and the lower end of the seventh flow channel is communicated with the lower end face of the main body; the rear side of the sixth runner is provided with an eighth runner in parallel, the upper end of the eighth runner is communicated with the rear side of the rectangular runner through a second auxiliary runner, and the lower end of the eighth runner is communicated with the lower end face of the main body.
- 2. The MCJ04A pilot cross valve body casting according to claim 1, wherein the main body is designed as a rectangular body, and trapezoidal protrusions are respectively designed on the rear side and the left side of the rectangular body and at the middle lower position; the right side design of main part has two circular cone recesses, and two circular cone recesses are close to the upper and lower both ends of main part respectively.
- 3. The MCJ04A pilot cross valve body casting according to claim 1, wherein the first flow passage, the second flow passage, the third flow passage, the fourth flow passage, the fifth flow passage, the sixth flow passage, the seventh flow passage and the eighth flow passage are all designed as cylindrical flow passages.
- 4. The MCJ04A pilot cross valve body casting according to claim 1, wherein the first and second auxiliary flow passages are both designed as arc-shaped cylindrical flow passages.
- 5. The MCJ04A pilot cross valve body casting according to claim 1, wherein the butterfly flow channel is formed by a triangular protrusion that is arched inwards at the front and back sides of a rectangular flow channel.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110766082.0A CN113600748B (en) | 2021-07-07 | 2021-07-07 | Pilot cross valve body casting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110766082.0A CN113600748B (en) | 2021-07-07 | 2021-07-07 | Pilot cross valve body casting |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN113600748A true CN113600748A (en) | 2021-11-05 |
| CN113600748B CN113600748B (en) | 2024-09-27 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202110766082.0A Active CN113600748B (en) | 2021-07-07 | 2021-07-07 | Pilot cross valve body casting |
Country Status (1)
| Country | Link |
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| CN (1) | CN113600748B (en) |
Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0709150A1 (en) * | 1994-10-28 | 1996-05-01 | Agustin Arana Erana | Process using reduced blowing pressure and device for blowing complex cores |
| JPH10292875A (en) * | 1998-05-21 | 1998-11-04 | Kowa Kogyosho:Kk | Butterfly valve device |
| JP2012007636A (en) * | 2010-06-22 | 2012-01-12 | Tanico Corp | Butterfly valve |
| CN102335723A (en) * | 2011-10-31 | 2012-02-01 | 王卫民 | Negative pressure casting molding method for thin-wall structure |
| CN107218426A (en) * | 2017-06-12 | 2017-09-29 | 南通华东油压科技有限公司 | A kind of pilot valve casting and its casting technique |
| WO2018039853A1 (en) * | 2016-08-29 | 2018-03-08 | 丁先华 | Hydraulic pilot valve body casting and mould therefor |
| CN108705045A (en) * | 2018-06-19 | 2018-10-26 | 如皋岩达机械工业有限公司 | A kind of pilot valve casting and its casting technique |
| DE102018204244A1 (en) * | 2017-12-21 | 2019-06-27 | Robert Bosch Gmbh | Pilot-controlled hydraulic directional valve and casting core for the valve housing of such a pilot-operated hydraulic directional control valve |
| CN209856464U (en) * | 2019-05-29 | 2019-12-27 | 张剑溪 | Go into wall tap valve body structure and auxiliary device for installation |
| CN216065422U (en) * | 2021-07-07 | 2022-03-18 | 南通华东油压科技有限公司 | MCJ04A guide cross valve body casting |
-
2021
- 2021-07-07 CN CN202110766082.0A patent/CN113600748B/en active Active
Patent Citations (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0709150A1 (en) * | 1994-10-28 | 1996-05-01 | Agustin Arana Erana | Process using reduced blowing pressure and device for blowing complex cores |
| JPH10292875A (en) * | 1998-05-21 | 1998-11-04 | Kowa Kogyosho:Kk | Butterfly valve device |
| JP2012007636A (en) * | 2010-06-22 | 2012-01-12 | Tanico Corp | Butterfly valve |
| CN102335723A (en) * | 2011-10-31 | 2012-02-01 | 王卫民 | Negative pressure casting molding method for thin-wall structure |
| WO2018039853A1 (en) * | 2016-08-29 | 2018-03-08 | 丁先华 | Hydraulic pilot valve body casting and mould therefor |
| CN107218426A (en) * | 2017-06-12 | 2017-09-29 | 南通华东油压科技有限公司 | A kind of pilot valve casting and its casting technique |
| DE102018204244A1 (en) * | 2017-12-21 | 2019-06-27 | Robert Bosch Gmbh | Pilot-controlled hydraulic directional valve and casting core for the valve housing of such a pilot-operated hydraulic directional control valve |
| CN108705045A (en) * | 2018-06-19 | 2018-10-26 | 如皋岩达机械工业有限公司 | A kind of pilot valve casting and its casting technique |
| CN209856464U (en) * | 2019-05-29 | 2019-12-27 | 张剑溪 | Go into wall tap valve body structure and auxiliary device for installation |
| CN216065422U (en) * | 2021-07-07 | 2022-03-18 | 南通华东油压科技有限公司 | MCJ04A guide cross valve body casting |
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| CN113600748B (en) | 2024-09-27 |
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