CN111283383A - Manufacturing method of ultra-large low-temperature valve body - Google Patents
Manufacturing method of ultra-large low-temperature valve body Download PDFInfo
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- CN111283383A CN111283383A CN201911359860.3A CN201911359860A CN111283383A CN 111283383 A CN111283383 A CN 111283383A CN 201911359860 A CN201911359860 A CN 201911359860A CN 111283383 A CN111283383 A CN 111283383A
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- way joint
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 14
- 238000003466 welding Methods 0.000 claims abstract description 37
- 238000003754 machining Methods 0.000 claims abstract description 26
- 238000000034 method Methods 0.000 claims abstract description 20
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 10
- 229910052786 argon Inorganic materials 0.000 claims abstract description 5
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 24
- 238000003825 pressing Methods 0.000 claims description 24
- 238000001816 cooling Methods 0.000 claims description 20
- 229910052757 nitrogen Inorganic materials 0.000 claims description 12
- 239000007788 liquid Substances 0.000 claims description 9
- 238000002791 soaking Methods 0.000 claims description 9
- 238000004140 cleaning Methods 0.000 claims description 6
- 239000000463 material Substances 0.000 claims description 6
- 238000010792 warming Methods 0.000 claims description 4
- 238000007664 blowing Methods 0.000 claims description 3
- 238000005266 casting Methods 0.000 claims description 3
- 230000007547 defect Effects 0.000 claims description 3
- 230000000694 effects Effects 0.000 claims description 3
- 210000001503 joint Anatomy 0.000 abstract 2
- 238000007789 sealing Methods 0.000 description 4
- 238000005242 forging Methods 0.000 description 3
- 238000003801 milling Methods 0.000 description 3
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 238000000227 grinding Methods 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
- B23P15/001—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass valves or valve housings
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Valve Housings (AREA)
Abstract
The invention relates to a manufacturing method of an ultra-large low-temperature valve body, which comprises the following steps: carrying out rough machining and butt joint groove machining on the five-way joint forge piece; carrying out finish machining and butt joint groove machining on the square round pipe and the valve cover forge piece; after the square round pipe and the five-way joint are fixed by the tool, the square round pipe and the valve cover are welded together by a manual argon arc welding method, and then the five-way joint and the square round pipe are welded; and processing the flange at the other end after the valve body is welded. The invention has the advantages of small welding deformation, high manufacturing precision, good dimensional stability, less workpiece clamping times and low processing cost.
Description
Technical Field
The invention belongs to the technical field of valve body manufacturing, and particularly relates to a manufacturing method of an ultra-large low-temperature valve body.
Background
The valve body is an essential part for fluid transportation, and the axial line precision of the valve body, the flange sealing surface precision and the size stability at the low temperature of-196 ℃ need to meet the design requirements. The traditional valve body is generally simple in overall dimension and used at normal temperature, the machining method is that mechanical machining is completed on a machine tool, then a valve body workpiece is taken down, materials are built on a sealing surface in a build-up welding mode according to technical requirements, the valve body workpiece is machined on the machine tool to meet the dimensional requirements, and finally the sealing surface is ground on a grinding machine. However, errors exist in the valve body during the re-clamping and positioning in the manufacturing process, and the dimensional stability at the low temperature of-196 ℃ is insufficient, so that the dimensional accuracy of the valve body cannot meet the design requirement finally.
The valve body is formed by welding and processing a five-way joint, a square round pipe and a valve cover, and can stably work under the working condition of-196 ℃ after cryogenic treatment.
Disclosure of Invention
The invention aims to solve the technical problems that the traditional valve body manufacturing method is large in axis positioning error, insufficient in low-temperature stability, incapable of meeting the design requirement of dimensional precision and poor in consistency of the sealing precision of the processed valve body, and provides a valve body manufacturing method.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a manufacturing method of an ultra-large low-temperature valve body comprises the following steps:
(1) preparing a valve body blank: the whole part blank is divided into a five-way joint, a square round pipe and a valve cover for forging and material preparation;
(2) and (3) checking a valve body blank: before entering the machining stage, the overall dimension and quality of the blank are checked to ensure that the machining allowance is sufficient and casting defects are not allowed.
(3) Processing a valve body blank: and (4) processing the five-way joint, the square round pipe and the valve cover by an upper machine tool, wherein a machining allowance is reserved on the flange connecting surface of the five-way joint.
(4) Fixing the valve body: utilize the frock to fix five-way joint, square pipe and valve gap, guarantee that the axis is unanimous.
(5) Welding the valve body: a manual argon arc welding method is adopted to weld the five-way joint and the four square circular tubes, straightening is carried out after welding is finished, the parallelism of the axes is ensured to meet the requirement, and then the valve cover and the square circular tubes are welded together.
(6) Cryogenic treatment of the valve body: the valve body is arranged in a cryogenic device for cryogenic treatment at the temperature of 196 ℃ below zero, so that the dimensional stability of the valve body under the low-temperature working condition is ensured. The method comprises the following specific steps: A. hoisting a workpiece into a deep cooling box, installing a thermocouple, and installing a liquid level meter according to the height of the part; B. cooling and returning the temperature in the first round: injecting low-temperature nitrogen into the deep cooling tank through a fan, slowly cooling the workpiece, injecting liquid nitrogen into the tank body after the workpiece is cooled to-180 ℃, completely soaking the workpiece, and continuously soaking for no less than 30min after the workpiece is completely cooled to the liquid nitrogen temperature; after soaking, blowing normal temperature dry air (or nitrogen) in the box body for temperature return. C. And (3) cooling and returning the temperature in the second round: after the workpiece returns to the normal temperature and stands for 3 hours, a second round of temperature reduction and temperature return process is carried out (the operation is the same as the above); D. cooling and warming for the third round: after the workpiece returns to the normal temperature and stands for 3 hours, a third cooling and temperature returning process is carried out (the operation is the same as the above); E. and after the workpiece is completely warmed, lifting the workpiece out of the box body.
(7) Finish machining of the valve body: the part adopts the frock to assist the dress card to support and decide the table card and press, carries out the finish machining of terminal surface flange and valve body terminal surface on the lathe, and the parallel of each valve opening axis is ensured to the processing connecting hole.
(8) Cleaning and checking: and cleaning the valve body, and checking the tolerance size and the form and position tolerance of the part.
The valve body is formed by welding and then processing a five-way joint, four square round pipes and four valve covers, wherein four interfaces of the five-way joint are positioned at one end of the five-way joint and are respectively welded with one ends of the four square round pipes, the other interface of the five-way joint is positioned at the other end of the five-way joint, and the four valve covers are respectively welded at the other ends of the four square round pipes; the tool in the step (4) comprises a tool 1, a tool 2 and a tool 3;
the tool 1 is a Harvard structure consisting of an upper half part and a lower half part, four circular grooves consisting of a semicircular groove positioned on the upper half part and a semicircular groove positioned on the lower half part are arranged between the upper half part and the lower half part, and the four circular grooves correspond to and are consistent with four interface positions at one end of the five-way joint; when the tool is used, the lower half part is firstly pressed by a pressing plate, then the four valve covers are sequentially placed in the semicircular grooves, the upper half part of the tool 1 is covered, and the upper part and the lower part are connected together by a screw locking pressing block, so that the relative positions and the axes of the four valve covers are positioned, and the deformation of the axes when the valve covers are welded with the square and round pipes is avoided;
the tool 2 is a Harvard structure consisting of an upper half part and a lower half part, two components with different heights and heights are manufactured according to the actual situation of the corresponding relation of the positions of the four interfaces at one end of the five-way joint, two circular grooves consisting of a semicircular groove at the upper half part and a semicircular groove at the lower half part are respectively arranged between the upper half part and the lower half part of each component, and the positions of the two circular grooves are correspondingly consistent with those of the two interfaces in the four interfaces at one end of the five-way joint; when the tool is used, the lower half part is firstly pressed by a pressing plate, then the four square round tubes are sequentially placed in the semicircular grooves, after the axis position is adjusted, the upper half part of the tool 2 is covered, and the upper half part and the lower half part are connected together through a screw locking pressing block, so that the axis positioning effect of the square round tubes is achieved;
the tool 3 is a structure formed by welding a bottom plate and a supporting plate, and is connected with the five-way connector through a screw when in use, and the bottom plate is pressed tightly through a pressing plate, so that the axis position of the five-way connector is positioned;
during welding, the tool 3 is fixed on a workbench and is pressed by a pressing plate, the tool 2 is installed, the trial-installed square circular tubes are butted with the five-way connector, after the axis is adjusted in place, the tool 2 is pressed by the pressing plate, and then the four square circular tubes and the five-way connector are welded; and finally, installing the tool 1, trial-installing four valve covers, sequentially butting with four square round tubes, fixing the tool 1 by using a pressing plate after axes are aligned, welding the valve covers and the square round tubes, and removing the tools 1, 2 and 3 after welding.
Due to the adoption of the technical scheme, the invention solves the technical problems of poor axle wire precision positioning, large repeated clamping positioning error, insufficient size stability at the low temperature of-196 ℃ and the like in the traditional valve body processing method. Compared with the prior art, the invention reduces welding deformation by utilizing the tool and a manual argon arc welding method, thereby ensuring the axis positioning precision. And the machine tool is only used for clamping twice, and the tool is used for assisting in supporting and positioning, so that repeated clamping and positioning errors are reduced. Through subzero treatment at the temperature of-196 ℃, the part is stabilized before finish machining, and deformation is avoided under the low-temperature working condition.
Drawings
FIG. 1 is a schematic structural view of a tool for fixing a five-way joint, a square-round pipe and a valve cover before welding of a valve body;
FIG. 2 is a view A-A of FIG. 1;
FIG. 3 is a view B-B of FIG. 1;
FIG. 4 is a view C-C of FIG. 1;
FIG. 5 is a schematic structural view of a tool 1 used in precision machining of a valve body according to the present invention
FIG. 6 is a left side view of FIG. 5;
FIG. 7 is a schematic structural view of a tool 2 used in the precision machining of a valve body according to the present invention
FIG. 8 is a left side view of FIG. 7;
FIG. 9 is a schematic structural view of a tool 3 used in the precision machining of a valve body according to the present invention
Fig. 10 is a left side view of fig. 9.
Detailed Description
The present invention will be described in detail with reference to the following specific examples: the invention relates to a manufacturing method of an ultra-large low-temperature valve body, which is formed by welding a five-way joint 4, a square round pipe 5 and a valve cover 6 and then processing the welded five-way joint (see figures 1-4), and comprises the following steps:
(1) preparing a valve body blank: the parts are divided into three sections of blanks, namely a five-way joint, a square round pipe and a valve cover, and are forged to prepare materials;
(2) and (3) checking a valve body blank: before entering a machining stage, checking the overall dimension and quality of a blank to ensure that machining allowance is enough and casting defects are not allowed;
(3) processing a valve body blank: processing the five-way joint, the square round pipe and the valve cover by using a machine tool, wherein a machining allowance is reserved on the flange connecting surface of the five-way joint;
(4) fixing the valve body: referring to fig. 1-10, the five-way joint, the square round tube and the valve cover are fixed by a tool to ensure that the axes are consistent;
(5) welding the valve body: firstly welding the five-way joint and four square round tubes by adopting a manual argon arc welding method, straightening after welding to ensure that the parallelism of the axes meets the requirement, and then welding the valve cover and the square round tubes together;
(6) cryogenic treatment of the valve body: placing the valve body in cryogenic equipment for cryogenic treatment at-196 ℃, and specifically comprising the following steps: A. hoisting a workpiece into a deep cooling box, installing a thermocouple, and installing a liquid level meter according to the height of the part; B. cooling and returning the temperature in the first round: injecting low-temperature nitrogen into the deep cooling tank through a fan, slowly cooling the workpiece, injecting liquid nitrogen into the tank body after the workpiece is cooled to-180 ℃, completely soaking the workpiece, and continuously soaking for no less than 30min after the workpiece is completely cooled to the liquid nitrogen temperature; after soaking, blowing normal temperature dry air (or nitrogen) in the box body for temperature return. C. And (3) cooling and returning the temperature in the second round: after the workpiece returns to the normal temperature and stands for 3 hours, a second round of temperature reduction and temperature return process is carried out (the operation is the same as the above); D. cooling and warming for the third round: after the workpiece returns to the normal temperature and stands for 3 hours, a third cooling and temperature returning process is carried out (the operation is the same as the above); E. and after the workpiece is completely warmed, lifting the workpiece out of the box body.
(7) Finish machining of the valve body: referring to fig. 1, the parts are supported by auxiliary clamping by a tool, the end face flange and the end face of the valve body are finely machined on a machine tool, and a connecting hole is machined to ensure that the axes of the valve holes are parallel;
(8) cleaning and checking: and cleaning the valve body, checking the tolerance size and form and position tolerance of the part, and straightening to ensure that the axis parallelism meets the requirement if the out-of-tolerance occurs.
Referring to fig. 1-4, the valve body of the invention is formed by welding and then processing a five-way joint 4, four square round tubes 5 and four valve covers 6, wherein four interfaces of the five-way joint 4 are positioned at one end of the five-way joint and are respectively welded with one ends of the four square round tubes 5, the other interface of the five-way joint 4 is positioned at the other end of the five-way joint, and the four valve covers 6 are respectively welded at the other ends of the four square round tubes; the tool in the step (4) comprises a tool 1, a tool 2 and a tool 3;
as shown in fig. 5-6, the tool 1 is a haversian structure composed of an upper half part and a lower half part, four circular grooves 1.3 composed of a semicircular groove located in the upper half part 1.1 and a semicircular groove located in the lower half part 1.2 are arranged between the upper half part and the lower half part, and the four circular grooves 1.3 are correspondingly consistent with four interface positions at one end of the five-way joint 4; when the tool is used, the lower half portion 1.1 is firstly pressed by a pressing plate, then the four valve covers 6 are sequentially placed in the semicircular groove 1.3, the upper half portion 1.1 of the tool 1 is covered, and the pressing block 8 is locked by a screw 9 to connect the upper portion and the lower portion together, so that the relative positions and the axes of the four valve covers 6 are positioned, and the axes are prevented from deforming when the valve covers 6 are welded with the square and round pipes 4;
as shown in fig. 7-8, the tool 2 is a haversian structure composed of an upper half part 2.1 and a lower half part 2.2, and two assemblies 2.4 and 2.5 with different heights and heights are manufactured according to the actual situation of the corresponding relation of the positions of four interfaces at one end of the five-way joint, two circular grooves 2.3 composed of a semicircular groove at the upper half part and a semicircular groove at the lower half part are respectively arranged between the upper half part 2.1 and the lower half part 2.2 of each assembly, and the positions of the two circular grooves 2.3 are correspondingly consistent with those of two interfaces in the four interfaces at one end of the five-way joint 4; when the positioning tool is used, the lower half part 2.2 is compressed by a pressing plate, then the four square round tubes 5 are sequentially placed in the semicircular grooves, after the axis position is adjusted, the upper half part 2.1 of the tool 2 is covered, and the upper half part and the lower half part are connected together by locking the pressing block 8 through the screw 9, so that the axis positioning effect of the square round tubes is achieved;
as shown in fig. 9-10, the tool 3 is a structure formed by welding a bottom plate 3.1 and a support plate 3.2, and is connected with the five-way joint through screws when in use, and the bottom plate is pressed through a pressing plate, so that the axial position of the five-way joint is positioned.
During welding, the tool 3 is fixed on a workbench and is pressed by a pressing plate, the tool 2 is installed, the trial-installed square circular tubes are butted with the five-way connector, after the axis is adjusted in place, the tool 2 is pressed by the pressing plate, and then the four square circular tubes and the five-way connector are welded; and finally, installing the tool 1, trial-installing four valve covers, sequentially butting with four square round tubes, fixing the tool 1 by using a pressing plate after axes are aligned, welding the valve covers and the square round tubes, and removing the tools 1, 2 and 3 after welding.
Examples 1
The five-way joint machining method in the embodiment comprises the following steps:
(1) forging the blank to prepare a material;
(2) roughly boring, roughly turning the outer circle and the plane, and processing to the size of a work-process diagram;
(3) programming processing is carried out on a numerical control processing center, and four square circular pipe interfaces and slope butt-joint interfaces are processed in a one-time clamping state, so that the axes are ensured to be parallel.
EXAMPLES example 2
The square and round tube machining method in the embodiment comprises the following steps:
(1) forging the blank to prepare a material;
(2) roughly boring, roughly turning an excircle, a hole and a plane, and processing to the size of a work instruction sheet;
(3) boring on a deep hole drill to ensure that the thickness of the deep hole drill is consistent with the thickness of the process base circles at two ends;
(4) turning the drawing requirement of the square to the excircle to ensure the uniform wall thickness;
(5) milling the four-side size of the end face of the valve body and the mounting hole, wherein the allowance of the connecting face is 5mm, and the allowance of the connecting face is 10mm in the diameter direction of the hole.
EXAMPLE 3
The valve body machining method in the embodiment comprises the following steps:
(1) the valve cover, the five-way joint and the square and round pipe are welded into a whole;
(2) roughly milling a square plane by one knife, boring each hole on the axis, and reserving the allowance of 6mm on the diameter; turning and processing a square plane and a hole on the other side;
(3) carrying out cryogenic treatment;
(4) and (4) finely milling the square plane and each hole of the boring axis to meet the drawing requirements, and turning over to process the square plane and the hole on the other side.
Claims (3)
1. A manufacturing method of an ultra-large low-temperature valve body is characterized in that the valve body is formed by welding and then processing a five-way joint, a square round pipe and a valve cover, and comprises the following steps:
(1) preparing a valve body blank: the parts are divided into three sections of blanks, namely a five-way joint, a square round pipe and a valve cover, and are forged to prepare materials;
(2) and (3) checking a valve body blank: before entering a machining stage, checking the overall dimension and quality of a blank to ensure that machining allowance is enough and casting defects are not allowed;
(3) processing a valve body blank: processing the five-way joint, the square round pipe and the valve cover by using a machine tool, wherein a machining allowance is reserved on the flange connecting surface of the five-way joint;
(4) fixing the valve body: fixing the five-way joint, the square round tube and the valve cover by using a tool to ensure that the axes are consistent;
(5) welding the valve body: firstly welding the five-way joint and four square round tubes by adopting a manual argon arc welding method, straightening after welding to ensure that the parallelism of the axes meets the requirement, and then welding the valve cover and the square round tubes together;
(6) cryogenic treatment of the valve body: placing the valve body in a cryogenic device for cryogenic treatment at-196 ℃;
(7) finish machining of the valve body: the parts are supported by auxiliary clamping through a tool, the end face flange and the end face of the valve body are finely machined on a machine tool, and a connecting hole is machined to ensure that the axes of the valve holes are parallel;
(8) cleaning and checking: and cleaning the valve body, checking the tolerance size and form and position tolerance of the part, and straightening to ensure that the axis parallelism meets the requirement if the out-of-tolerance occurs.
2. The method for manufacturing an ultra-large low temperature valve body according to claim 1, wherein: placing the valve body in a cryogenic device for cryogenic treatment at-196 ℃, namely, A, hoisting a workpiece into a cryogenic box, installing a thermocouple, and installing a liquid level meter according to the height of the part; B. cooling and returning the temperature in the first round: injecting low-temperature nitrogen into the deep cooling tank through a fan, slowly cooling the workpiece, injecting liquid nitrogen into the tank body after the workpiece is cooled to-180 ℃, completely soaking the workpiece, and continuously soaking for no less than 30min after the workpiece is completely cooled to the liquid nitrogen temperature; after soaking, blowing normal-temperature dry air or nitrogen in the box body for temperature return; C. and (3) cooling and returning the temperature in the second round: c, after the workpiece returns to the normal temperature and stands for 3 hours, repeating the step B to carry out a second round of temperature reduction and temperature return process; D. cooling and warming for the third round: c, after the workpiece returns to the normal temperature and stands for 3 hours, repeating the step B to carry out a third cooling and warming process; E. and after the workpiece is completely warmed, lifting the workpiece out of the box body.
3. The manufacturing method of the ultra-large type cryogenic valve body according to claim 1 or 2, characterized in that: the valve body is formed by welding and then processing a five-way joint, four square round pipes and four valve covers, wherein four interfaces of the five-way joint are positioned at one end of the five-way joint and are respectively welded with one ends of the four square round pipes, the other interface of the five-way joint is positioned at the other end of the five-way joint, and the four valve covers are respectively welded at the other ends of the four square round pipes; the tool in the step (4) comprises a tool 1, a tool 2 and a tool 3;
the tool 1 is a Harvard structure consisting of an upper half part and a lower half part, four circular grooves consisting of a semicircular groove positioned on the upper half part and a semicircular groove positioned on the lower half part are arranged between the upper half part and the lower half part, and the four circular grooves correspond to and are consistent with four interface positions at one end of the five-way joint; when the tool is used, the lower half part is firstly pressed by a pressing plate, then the four valve covers are sequentially placed in the semicircular grooves, the upper half part of the tool 1 is covered, and the upper part and the lower part are connected together by a screw locking pressing block, so that the relative positions and the axes of the four valve covers are positioned, and the deformation of the axes when the valve covers are welded with the square and round pipes is avoided;
the tool 2 is a Harvard structure consisting of an upper half part and a lower half part, two components with different heights and heights are manufactured according to the actual situation of the corresponding relation of the positions of the four interfaces at one end of the five-way joint, two circular grooves consisting of a semicircular groove at the upper half part and a semicircular groove at the lower half part are respectively arranged between the upper half part and the lower half part of each component, and the positions of the two circular grooves are correspondingly consistent with those of the two interfaces in the four interfaces at one end of the five-way joint; when the tool is used, the lower half part is firstly pressed by a pressing plate, then the four square round tubes are sequentially placed in the semicircular grooves, after the axis position is adjusted, the upper half part of the tool 2 is covered, and the upper half part and the lower half part are connected together through a screw locking pressing block, so that the axis positioning effect of the square round tubes is achieved;
the tool 3 is a structure formed by welding a bottom plate and a supporting plate, and is connected with the five-way connector through a screw when in use, and the bottom plate is pressed tightly through a pressing plate, so that the axis position of the five-way connector is positioned;
during welding, the tool 3 is fixed on a workbench and is pressed by a pressing plate, the tool 2 is installed, the trial-installed square circular tubes are butted with the five-way connector, after the axis is adjusted in place, the tool 2 is pressed by the pressing plate, and then the four square circular tubes and the five-way connector are welded; and finally, installing the tool 1, trial-installing four valve covers, sequentially butting with four square round tubes, fixing the tool 1 by using a pressing plate after axes are aligned, welding the valve covers and the square round tubes, and removing the tools 1, 2 and 3 after welding.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911359860.3A CN111283383B (en) | 2019-12-25 | 2019-12-25 | Manufacturing method of ultra-large low-temperature valve body |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911359860.3A CN111283383B (en) | 2019-12-25 | 2019-12-25 | Manufacturing method of ultra-large low-temperature valve body |
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| CN111283383B CN111283383B (en) | 2021-03-19 |
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Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102021A (en) * | 1987-04-29 | 1988-11-09 | 湖南省衡阳市农机研究所 | Method and device for improving low temperature cold start performance of vortex chamber diesel engine |
| US20070113405A1 (en) * | 2003-12-20 | 2007-05-24 | Ferdinand Reiter | Method for manufacturing a solid housing |
| CN106392500A (en) * | 2016-12-06 | 2017-02-15 | 浙江苏泊尔卫浴有限公司 | Angle valve as well as angle valve manufacturing process and positioning tool |
-
2019
- 2019-12-25 CN CN201911359860.3A patent/CN111283383B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN87102021A (en) * | 1987-04-29 | 1988-11-09 | 湖南省衡阳市农机研究所 | Method and device for improving low temperature cold start performance of vortex chamber diesel engine |
| US20070113405A1 (en) * | 2003-12-20 | 2007-05-24 | Ferdinand Reiter | Method for manufacturing a solid housing |
| CN106392500A (en) * | 2016-12-06 | 2017-02-15 | 浙江苏泊尔卫浴有限公司 | Angle valve as well as angle valve manufacturing process and positioning tool |
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| CN111283383B (en) | 2021-03-19 |
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