Control valve and manufacturing method thereof

Abstract

A control valve and a manufacturing method thereof are disclosed, the control valve includes a housing (1), a first valve seat (2) and a first connecting pipe (4), the first valve seat (2) is formed by pressing or drawing a metal material, the first valve seat (2) includes a first base (21), a first connecting part (22) and a second connecting part (23), the first base (21) is annular, the first connecting part (22) is tubular and extends from an outer edge of the first base (21) to the housing (1), the second connecting part (23) is tubular and extends from an inner edge of the first base (21) to the first connecting pipe (4), the housing (1) and the first connecting part (22) are fixedly connected, and the first connecting pipe (4) and the second connecting part (23) are fixedly connected. In the welding process, the engagement position of the valve seat and the housing (1) is easily controlled.

Description

[Technical field]

[0001] This application claims priority from the following four Chinese patent applications: It was submitted to the China Patent Office on March 31, 2022, the application number is 202210333693.0, and the invention name is "Method of manufacturing a control valve." The application number is 202220733494.4 and the invention title is "Control Valve"; It was submitted to the China Patent Office on June 21, 2022, the application number is 202210704038.1, and the invention name is "Method of manufacturing a control valve." The application number is 202221573072.1 and the invention name is "Control Valve." The entire contents of which are incorporated herein by reference.

[0002] The present invention relates to the technical field of fluid control, and more particularly to a control valve and a method for manufacturing the same. [Background technology]

[0003] FIG. 1 is a cross-sectional view of a ball valve of the background art. As shown in FIG. 1, the ball valve includes a valve body pipe 01, a left valve body 02, a right valve body 03, a left connecting pipe 04, a right connecting pipe 05, a valve stem 06, and a valve body 07. The valve body pipe 01 is fixed to the left valve body 02 and the right valve body 03 by welding. The valve stem 06 is engaged with the valve body 07 via a key groove, and can rotate the valve body 07 in the circumferential direction. Summary of the Invention [Problem to be solved by the invention]

[0004] In this structure, a left mounting groove 021 is machined into the left valve body 02, a right mounting groove 031 is machined into the right valve body 03, the left connecting pipe 04 is welded so as to be positioned in the left mounting groove 021, and the right connecting pipe 05 is welded so as to be positioned in the right mounting groove 031. The structure of the valve body is complicated, and the processing is inconvenient.

[0005] In addition, in this structure, the engagement positions of the left valve body 02, the right valve body 03 and the valve body tube 01 are related to the preload force of the left valve body 02 and the right valve body 03 against the valve disc 07, and affect the rotational torque of the valve rod 06 against the valve disc 07. [Means for solving the problem]

[0006] The present application aims to provide a control valve, comprising a housing, a first valve seat and a first connecting pipe, wherein the first valve seat is formed by pressing or drawing a metal material, the first valve seat comprises a first base, a first connecting portion and a second connecting portion, the first base is annular, the first connecting portion is tubular and extends from an outer edge of the first base toward the housing side, the second connecting portion is tubular and extends from an inner edge of the first base toward the first connecting pipe side, the housing is fixedly connected to the first connecting portion, and the first connecting pipe is fixedly connected to the second connecting portion.

[0007] The control valve provided by the present application includes a housing, a first valve seat and a first connecting pipe, where the first valve seat is formed by pressing or drawing a metal material, the first valve seat includes a first connecting part and a second connecting part, the housing is fixedly connected to the first connecting part, and the first connecting pipe is fixedly connected to the second connecting part. Compared to the background art, the structure of the first valve seat of the present application is simple.

[0008] The present invention aims to provide a method for manufacturing a control valve, a step of processing and manufacturing a housing, a first valve seat, and a second valve seat using steel material, wherein the first valve seat includes a first base, a first connecting portion, and a second connecting portion, the first base is annular, the first connecting portion is tubular, the second connecting portion is tubular, the first connecting portion and the second connecting portion are located on different sides of the first base, and an inner diameter size of the first connecting portion is larger than an outer diameter size of the second connecting portion; the second valve seat includes a second base, a third connecting portion, and a fourth connecting portion, the second base is annular, the third connecting portion is tubular, the fourth connecting portion is tubular, the third connecting portion and the fourth connecting portion are located on different sides of the second base, and an inner diameter size of the third connecting portion is larger than an outer diameter size of the fourth connecting portion; providing a first connecting pipe and a second connecting pipe, assembling a first valve seat connecting pipe unit, and welding and fixing the first connecting part to the first connecting pipe; assembling a second valve seat connecting pipe unit, and welding and fixing the third connecting part to the second connecting pipe; The method includes assembling the housing, the first valve seat connecting pipe unit, and the second valve seat connecting pipe unit, welding and fixing the second connecting portion to the housing, and welding and fixing the fourth connecting portion to the housing.

[0009] In the manufacturing method of the control valve provided by the present invention, the first connecting part is welded and fixed to the first connecting pipe to form a first valve seat connecting pipe unit, and the third connecting part is welded and fixed to the second connecting pipe to form a second valve seat connecting pipe unit, and the housing, the first valve seat connecting pipe unit, and the second valve seat connecting pipe are assembled. According to this solution, the engagement positions of the first valve seat, the second valve seat and the housing can be easily controlled during the welding process. [Brief description of the drawings]

[0010] [Figure 1] FIG. 1 is a cross-sectional view of a background art control valve. [Diagram 2] 1 is a cross-sectional view of a control valve provided by the present invention. [Figure 3A] FIG. 3 is a locally enlarged view of a portion I1 in FIG. 2. [Figure 3B] FIG. 3 is a locally enlarged view of a portion I2 in FIG. [Figure 4] FIG. 3 is a three-dimensional view of the first valve seat in FIG. 2. [Diagram 5] FIG. 3 is a three-dimensional view of the second valve seat in FIG. 2. [Figure 6] This is an installation diagram of the valve seat connecting pipe unit A. [Figure 7] FIG. 11 is a view showing the installation of the first mounting member D. [Figure 8] FIG. 13 is a diagram showing the installation of the stop ring, the joint, and the housing. [Figure 9] FIG. 13 is a view showing the installation of the third mounting member C. [Figure 10] FIG. 11 is a cross-sectional view of a third mounting member C. [Figure 11] 13 is a diagram showing the installation of the third mounting member C, the first mounting member D, and the second mounting member E. FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] In order to make those skilled in the art better understand the solutions of the present invention, the present invention will be further described in detail hereinafter in combination with drawings and specific embodiments.

[0012] Here, the directional terms such as up, down, etc. in this specification are defined based on the positions of the components in FIG. 2 in the drawing and the positions between the components, and are merely for the purpose of expressing technical solutions clearly and conveniently. Herein, the directional terms used in this specification do not limit the scope of protection claimed by this application.

[0013] Referring to Figures 2, 3A and 4, Figure 2 is a cross-sectional view of a control valve provided by the present invention, Figure 3A is a local enlarged view of a portion I1 in Figure 2, and Figure 4 is a three-dimensional view of the first valve seat in Figure 2.

[0014] As shown in the drawings, the control valve includes a housing 1 , a first valve seat 2 , a joint 3 , a first connecting pipe 4 , and a valve stem 5 . The first valve seat 2 is formed by pressing or stretching a metal material. Specifically, the first valve seat 2 is manufactured by pressing or stretching a metal plate material. The first valve seat 2 includes a first base 21, a first connecting portion 22 and a second connecting portion 23. The first base 21 is annular, the first connecting portion 22 is tubular and formed so as to extend from the outer edge of the first base 21 toward the housing 1 side, and the second connecting portion 23 is tubular and formed so as to extend from the inner edge of the first base 21 toward the first connecting pipe 4 side. That is, the first connecting portion 22 and the second connecting portion 23 are located on different sides of the first base 21. Furthermore, the first connection portion 22 and the second connection portion 23 are arranged coaxially, i.e., the central axis of the first connection portion 22 overlaps with the central axis of the second connection portion 23, and the inner diameter size of the first connection portion 22 is larger than the outer diameter size of the second connection portion 23. The housing 1 is fixedly connected to the first connecting portion 22 by welding or screws, and the first connecting pipe 4 is fixedly connected to the second connecting portion 23 by welding or screws. Specifically, the housing 1 is fixed to the first connection part 22 by laser welding, and the first connection pipe 4 is fixed to the second connection part 23 by furnace welding.

[0015] In this embodiment, the first valve seat 2 is manufactured by pressing or drawing a metal plate. The first valve seat 2 includes a first connecting portion 22 and a second connecting portion 23, the housing 1 is fixedly connected to the first connecting portion 22, and the first connecting pipe 4 is fixedly connected to the second connecting portion 23. Compared with the background art, the structure of the valve seat of this embodiment is simple, does not require turning, and is convenient to process.

[0016] The control valve further includes a valve body 6 and a first gasket 7 . The valve element 6 is substantially spherical and is located in a valve chamber 10 of the control valve. The first valve seat 2 includes an inner step 24 whose step surface faces the valve body 6 , and this inner step 24 is composed of a first base 21 and a first connection portion 22 . The first gasket 7 is provided on the inner step portion 24 and abuts against the valve body 6 to support the valve body 6 . The first valve seat 2 has a simple structure, since the inner step 24 formed by pressing or drawing provides a supporting effect for the first gasket 7 and the valve body 6.

[0017] As a further embodiment, the inner step 24 includes a groove 20 located at the connection between the first base 21 and the first connecting portion 22 and formed by pressing. As a clearance angler, the recessed groove 20 can reliably engage the first gasket 7 and the first valve seat 2, improving the engagement precision between them. And / or, the first gasket 7 includes a chamfered portion 71, and the chamfered surface of the chamfered portion 71 is positioned toward the connection point between the first base 21 and the first connection portion 22, thereby ensuring engagement between the first gasket 7 and the first valve seat 2.

[0018] The first gasket 7 further includes a first accommodating groove 70 , the opening of which faces the first base 21 . The control valve further comprises a first sealing ring 9 which is made from a rubber material and has elastic properties. The first sealing ring 9 is located in the first accommodating groove 70 and abuts against the groove wall forming the first accommodating groove 70, and the first sealing ring 9 abuts against the first base 21, i.e., is elastically abutted between the groove wall of the first accommodating groove 70 and the first base 21.

[0019] Furthermore, the first connecting pipe 4 includes a first engagement segment 41 that is fitted onto the second connecting portion 23 . The second connection portion 23 is formed by a wire drawing process and includes a ridge portion 231 located on the outer circumferential surface of the second connection portion 23. The first engagement segment 41 is engaged with the ridge portion 231 and then fixed by welding. By positioning the convex rib portion 231, during welding, solder flows between the first engagement segment 41 and the second connection portion 23 through the convex rib portion 231, improving the reliability of the welding between the first connecting pipe 4 and the first valve seat 2.

[0020] The housing 1 is formed by pressing or drawing a stainless steel pipe material, and includes a main body portion 11 and a protrusion portion 12, the protrusion portion 12 protruding from the circumferential outer wall of the main body portion 11, the main body portion 11 is cylindrical and the protrusion portion 12 is annular, at least a portion of the first connecting portion 22 is located in a cavity 110 of the main body portion, the outer peripheral wall of the first connecting portion 22 is gap-fitted into the inner wall of the housing 1, and the main body portion 11 is fixed to the first connecting portion 22 by welding. The joint 3 includes an outer step 33 with a step surface facing downward (towards the valve body 6), the protrusion 12 is positioned so as to contact the step surface of the outer step 33, the step wall of the outer step 33 is located in the protrusion cavity 120, and the protrusion 12 is welded and fixed to the outer step 33. By disposing the outer step portion 33 on the joint 3, the protrusion 12 comes into contact with the step surface of the outer step portion 33, thereby realizing positioning, improving the positioning accuracy between the joint 3 and the housing 1, and making it easier to weld the two together.

[0021] In this solution, the joint 3 is substantially annular and is formed by turning from a stainless steel section. The joint 3 includes a through hole 30, and the valve rod 5 is inserted into the through hole 30. The lower segment of the valve rod 5 enters the valve chamber 10 of the control valve and is connected to the valve body 6 by a key groove. The valve rod 5 rotates the valve body 6 to open or close the control valve or adjust the flow rate of the control valve.

[0022] As a further technical solution, the joint 3 includes an integrally molded lower step 32, and the valve stem 5 includes a valve stem step 54 with a stepped surface facing upward, which abuts against the lower step 32 to restrict the valve stem 5 from moving upward along the longitudinal direction of the control valve. In this solution, the valve rod 5 has a flip structure, and the integrally molded lower step 32 reliably restricts the position of the valve rod 5. The lower step 32 is provided at the joint 3. Even if the valve rod 5 does not have a flange protruding outward, reliable position restriction can be achieved, and the material cost of the valve rod 5 can be reduced.

[0023] The housing 1, the first valve seat 2 and the first connecting pipe 4 are manufactured from stainless steel material and in the present solution the housing 1 is fixed to the joint 3 by laser welding and the first valve seat 2 is fixed as a unit to the first connecting pipe 4 by furnace welding and then fixed to the housing 1 by laser welding.

[0024] Please also refer to FIG. 5, which is a three-dimensional view of the second valve seat of FIG.

[0025] As shown in FIGS. 2 and 5, the control valve further includes a second valve seat 2', a second connecting pipe 4' and a second gasket 7'. The second valve seat 2 ′ has a structure similar to that of the first valve seat 2 , is manufactured by pressing or drawing a metal plate material, and is disposed symmetrically with respect to the central axis of the protruding portion 12 of the housing 1 . Specifically, the second valve seat 2' includes a second base 21', a third connecting portion 22' and a fourth connecting portion 23', the second base 21' is annular, the third connecting portion 22' is tubular and extends from the outer edge of the second base 21' toward the housing 1 side, and the fourth connecting portion 23' is tubular and extends from the inner edge of the second base 21' toward the second connecting pipe 4'. The housing 1 is fixedly connected to the third connecting portion 22' by welding or screws, and the second connecting pipe 4' is fixedly connected to the fourth connecting portion 23' by welding or screws. Such an arrangement simplifies the structure of the second valve seat 2'.

[0026] The second connecting pipe 4' includes a second engaging segment 41' that is fitted onto the fourth connecting portion 23' and fixed thereto by welding.

[0027] The second gasket 7 ′ has a structure similar to that of the first gasket 7 , and is disposed symmetrically with respect to the central axis of the protrusion 12 . The valve body 6 is located between the first gasket 7 and the second gasket 7 ′, the second valve seat 2 ′ supports the second gasket 7 ′, and the second gasket 7 ′ supports the valve body 6 .

[0028] The present invention further provides a manufacturing method for a control valve, and refers to Figures 2 and 3A, as well as Figures 3B, 6 to 11, where Figure 3B is a local enlarged view of location I2 in Figure 2, Figure 6 is an installation view of the valve seat connecting pipe unit A, Figure 7 is an installation view of the first mounting member D, Figure 8 is an installation view of the stop ring, joint and housing, Figure 9 is an installation view of the third mounting member C, Figure 10 is a cross-sectional view of the third mounting member C, and Figure 11 is an installation view of the third mounting member C, the first mounting member D and the second mounting member E.

[0029] As shown in the drawings, the specific manufacturing process of the above control valve is as follows: The housing 1 is manufactured by processing steel material. The housing 1 includes a main body 11 and a protrusion 12. Specifically, a stainless steel tube is first cut into a housing blank, which is then pressed to flange the protrusion 12. Of course, it may be manufactured from a stainless steel plate material, which is first rolled into a tubular shape, and the subsequent steps are the same as those for the tubular material.

[0030] The first valve seat 2, the second valve seat 2', the first connecting pipe 4, and the second connecting pipe 4' are fabricated by processing using steel material. The first valve seat 2 and the second valve seat 2' are manufactured by pressing a stainless steel plate material, and the structures of both are similar. Specifically, the first valve seat 2 is formed by pressing a stainless steel plate material into a "Z"-shaped structure. The first valve seat 2 includes a first base 21, a first connecting portion 22 and a second connecting portion 23. The first base 21 is annular, the first connecting portion 22 is tubular and extends from the outer edge of the first base 21 to one side, and the second connecting portion 23 is tubular and extends from the inner edge of the first base 21 to the other side. That is, the first connecting portion 22 and the second connecting portion 23 are located on different sides of the first base 21. The inner diameter size of the first connecting portion 22 is larger than the outer diameter size of the second connecting portion 23. The first base 21 and the first connecting portion 22 form an inner step portion 24.

[0031] The second valve seat 2' is made of stainless steel sheet material pressed into a "Z" shaped structure, and the second valve seat 2' includes a second base 21', a third connecting portion 22' and a fourth connecting portion 23', the second base 21' is annular, the third connecting portion 22' is tubular and extends from the outer edge of the second base 21' to one side, and the fourth connecting portion 23' is tubular and extends from the inner edge of the second base 21' to the other side, that is, the third connecting portion 22' and the fourth connecting portion 23' are located on different sides of the second base 21', and the inner diameter size of the third connecting portion 22' is larger than the outer diameter size of the fourth connecting portion 23'.

[0032] In this solution, after pressing, turning is not required for the first valve seat 2 and the second valve seat 2', and the processing cost of the first valve seat 2 and the second valve seat 2' can be reduced.

[0033] The first connecting pipe 4 and the second connecting pipe 4' are specifically made of stainless steel pipe material, and specifically, one end of the first connecting pipe 4 is formed into a first engaging segment 41 by a widening process, and a copper bush is welded to the other end of the first connecting pipe 4 to match and weld to the user's copper connecting pipe during the actual production process, and the copper bush is fitted externally or internally to the other end of the first connecting pipe 4. The second connecting pipe 4' has a structure similar to that of the first connecting pipe 4, and therefore will not be described in detail.

[0034] A first gasket 7 and a second gasket 7' are provided, and the first gasket 7 and the second gasket 7' are fabricated from materials such as PTFE, PEK, high temperature nylon, etc.

[0035] The joint 3 is manufactured by machining using steel material, specifically, the joint 3 is manufactured by lathe cutting from a stainless steel shape material. When made into a component, the joint 3 has a generally hollow cylindrical shape and includes a through hole 30 . The joint 3 includes an upper step 31 with its step surface facing upward, a lower step 32 with its step surface facing downward, and an outer step 33 located on the outer periphery thereof with its step surface facing downward, the outer step 33 being located in the lower segment of the joint 3, and a male thread portion 33 is machined on the outer periphery wall of the upper segment of the joint 3. A stop ring 8 is provided, which is pressed from stainless steel sheet material and includes an engagement hole 80 .

[0036] The valve stem 5 is manufactured by processing a steel material. The valve stem 5 is rod-shaped, and specifically, is manufactured by turning a stainless steel bar material. The extending direction of the first base 21 coincides with the length direction of the valve rod 5, and the extending direction of the second base 21' coincides with the length direction of the valve rod 5. The valve stem 5 includes a cylindrical portion 51 , a first key portion 52 and a second key portion 53 , the first key portion 52 being located on the upper side of the cylindrical portion 51 , and the second key portion 53 being located on the lower side of the cylindrical portion 51 . The cylindrical portion 51 includes a valve stem step portion 54 whose stepped surface faces upward.

[0037] The valve cap 100 is manufactured by machining using a steel material. Specifically, the valve cap 100 is manufactured by machining using a stainless steel material, and the female screw portion 101 is formed on the inner peripheral wall of the valve cap 100 by turning.

[0038] To form the first valve seat connecting pipe unit A, the first valve seat 2, the first connecting pipe 4 and the first copper bush 200 are fixed and connected by furnace brazing. Specifically, at least a portion of the first connecting portion 22 of the first valve seat 2 enters into the first engaging segment 41 of the first connecting pipe 4, and the first copper bush 200 is fitted externally or internally into the other end of the first connecting pipe 4, and the three are fixed by furnace brazing.

[0039] As the second valve seat connecting pipe unit B, the second valve seat 2', the second connecting pipe 4' and the second copper bush 200' are fixed and connected by furnace brazing. Specifically, at least a portion of the third connecting portion 22' of the second valve seat 2' is inserted into the second engaging segment 41' of the second connecting pipe 4', and the second copper bush 200' is fitted externally or internally into the other end of the second connecting pipe 4', and the three are fixed by furnace brazing. Here, the first valve seat 2 has a structure similar to that of the second valve seat 2', the first connecting pipe 4 has a structure similar to that of the second connecting pipe 4', and the first copper bush 200 has a structure similar to that of the second copper bush 200', so that the first valve seat connecting pipe unit A and the second valve seat connecting pipe unit B may be replaced with each other.

[0040] By inserting a portion of the lower segment of joint 3 into cavity 120 of the protrusion, step surface 331 of outer step 33 contacts protrusion 12, and step wall 332 of outer step 33 is located in cavity 120 of the protrusion, fixing and connecting joint 3 to housing 1 by laser welding, and stop ring 8 is placed on upper step 31 of joint 3, and fixing and connecting stop ring 8 to joint 3 by laser welding.

[0041] The valve rod 5 is assembled, specifically, the valve rod 5 is attached from one open end of the housing 1, so that the valve rod 5 passes through the through-hole 30 of the joint 3, and the valve rod step 54 abuts against the lower step 32 of the joint 3, restricting the valve rod 5 from escaping upward in the vertical direction. The first key portion 52 projects from the joint 3 to facilitate rotation of an external tool such as a wrench.

[0042] A valve body 6 is provided which is manufactured from stainless steel material. When mounting the valve body 6, in order to facilitate the mounting, first rotate the valve stem 5 until the extension direction of the second key portion 53 coincides with the axial direction of the main body portion 11, and then mount the valve body 6 from one open end of the housing 1, so that the second key portion 53 fits into the groove 60 of the valve body 6 to form the third mounting member C, i.e., the third mounting member C includes the housing 1, the joint 3, the stop ring 8, the valve stem 5 and the valve body 6.

[0043] The housing 1, the first valve seat connecting pipe unit A, and the second valve seat connecting pipe unit B are assembled; specifically, at least a portion of the second connecting portion 23 of the first valve seat 2 is inserted into the housing 1, and the second connecting portion 23 is welded and fixed to the housing 1; and at least a portion of the fourth connecting portion 23' of the second valve seat 2' is inserted into the housing 1, and the fourth connecting portion 23' is welded and fixed to the housing 1.

[0044] Compared with the background art, in the welding process, the present solution can easily control the accuracy of the engagement position between the first valve seat, the second valve seat and the housing, so that the preload force received by the valve body of the first valve seat and the second valve seat is consistent, and therefore the consistency of the rotation torque of the valve stem relative to the valve body is improved.

[0045] In addition, the control valve further includes a first sealing ring 9 and a second sealing ring 9', the first sealing ring 9 and the second sealing ring 9' are made of a rubber material, the first gasket 7 is provided with a first accommodating groove 70, the opening of the first accommodating groove 70 faces the first base 21, and before the second connecting portion 23 of the first valve seat 2 is welded to the housing 1, the first sealing ring 9 is placed in the first accommodating groove 70, and then mounted on the first valve seat connecting pipe unit A as a unit to form a first mounting member D. Specifically, the first gasket 7 is disposed on the inner step portion 24 of the first valve seat 2, so that the outer peripheral wall of the first gasket 7 and the inner peripheral wall of the second connection portion 23 are tightly fitted together.

[0046] Similarly, the second gasket 7' has a structure similar to that of the first gasket 7, and is provided with a second accommodating groove 70'. Before the fourth connecting portion 23' of the second valve seat 2' is welded to the housing 1, a second sealing ring 9' is placed in the second accommodating groove 70' and then attached to the second valve seat connecting pipe unit B as a unit to form a second mounting member E, thereby causing the outer peripheral wall of the second gasket 7' to be tightly fitted with the inner peripheral wall of the fourth connecting portion 23'. The specific mounting method is the same as that for the first mounting member D.

[0047] In the process of mounting the first mounting member D, the second mounting member E, and the third mounting member C, a jig is first used to position the third mounting member C relative to the joint 3, and then the first mounting member D and the second mounting member E are clamped by a synchronous operating mechanism (e.g., a servo device, etc.). The first mounting member D is clamped against the outer wall 211 of the first base 21 of the first valve seat 2 as its positioning surface, and the second mounting member D is clamped against the outer wall 211' of the second base 21' of the second valve seat 2' as its positioning surface. After clamping, the first mounting member D and the second mounting member E are simultaneously moved toward the valve body 6 by a predetermined distance. As a result, a portion of the first valve seat 2 enters the cavity 110 of the main body portion and the first gasket 7 abuts against the valve body 6, and a portion of the second valve seat 2' enters the cavity 110 of the main body portion and the second gasket 7' abuts against the valve body 6, thereby achieving pre-positioning. After prepositioning, the first valve seat 2 is fixedly connected to the housing 1 by laser welding, and the second valve seat 2' is fixedly connected to the housing 1 by laser welding. As can be conceived, the first valve seat 2, the second valve seat 2' may be laser welded to the housing 1 at the same time. In this way, the mounting accuracy of the control valve is improved, the consistency of the rotation torque of the valve stem relative to the valve disc is increased, and further, the internal leakage prevention performance of the control valve is improved.

[0048] As can be imagined, the housing 1 and the first and second valve seats 2 and 2' may be fixed to each other by a welding method such as argon arc welding or gas shielded arc welding.

[0049] Then, the valve cap 100 is screwed onto the joint 3 to form a control valve, and the male thread portion 34 and the female thread portion 101 are screwed together, whereby the valve cap 100 is fixed and connected to the joint 3.

[0050] As a specific implementation design, as shown in FIG. 6, when manufacturing the first valve seat 2, a wire drawing process is performed on the first connection portion 22 to form a convex portion 231, and the first engaging segment 41 is engaged with and welded to the convex portion 231. Thus, in contrast to the above embodiment, in this solution, the convex rib portion 231 contributes to the flow of solder, and can improve the reliability of welding between the first valve seat 2 and the first connecting pipe 4.

[0051] As can be appreciated, the connection structure between the first valve seat 2 and the first connecting pipe 4 may also be used in place of the connection structure between the second valve seat 2' and the second connecting pipe 4', with corresponding technical effects, and no further details are given here.

[0052] Furthermore, as shown in Figures 2 and 3A, the first gasket 7 includes a chamfered portion 71, which faces the connection point between the first base 21 and the second connecting portion 23. In this way, an R angle at the connection point between the first base 21 and the second connecting portion 23 can be avoided, and the reliability of engagement between the first valve seat 2 and the first gasket 7 is ensured.

[0053] Alternatively, the first valve seat 2 is pressed to form a groove 20, which is located at the connection point between the first base 21 and the second connecting portion 23. In this case, too, the reliability of the engagement between the first valve seat 2 and the first gasket 7 is ensured.

[0054] As can be appreciated, the engagement structure between the first valve seat 2 and the first gasket 7 may also be used in place of the engagement structure between the second valve seat 2' and the second gasket 7', with corresponding technical effects, which will not be described here in detail.

[0055] In the manufacturing method of the control valve of this embodiment, each component is basically made of stainless steel material, which meets the current requirements for controlling the lead content in products. The three components, namely the first copper bush, the first connecting pipe and the first valve seat, are fixed by welding in one go, the process is simple, the processing is convenient, and they are fixed and connected by furnace brazing and laser welding, and do not need pickling, and the production process is clean and environmentally friendly.

[0056] In the present specification, the principles and embodiments of the present invention are described using specific examples, and the explanations of the above examples are only for understanding the method and spirit of the present invention. Here, those skilled in the art may make some improvements and modifications to the present invention without departing from the principles of the present invention, and these improvements and modifications also fall within the scope of protection of the claims of the present invention. [Explanation of symbols]

[0057] 1. Housing 10 Valve chamber 11 Main body; 110 Body cavity 12...Protrusion 120 .... Protrusion cavity 2. First valve seat 21 First Base 211...First base outer wall 22 First connection part 23 Second connection part 231 .... Convex portion 24...Inner step 20 Groove 2' Second valve seat 21' 2nd base 211' 2nd base outer wall 22' 3rd connection 23' 4th connection 3. Joint 30 ...Through hole 31 Upper step 32...lower step 33...outer step 331 ...Outer step surface 332....Outer step wall 34 Male thread 4. First connecting pipe 41 First engagement segment 4' ···Second connecting pipe; 41' Second engagement segment 5. Valve stem 51 Cylindrical section 52 First key part 53 Second key part 54 Valve stem step 6 Valve body 60...Groove 7. First gasket 70 First receiving groove 71 Chamfered part 7' Second gasket 70' 2nd Receiving Groove 8 Stop ring 80 Engagement hole 9. First sealing ring 9' Second sealing ring 100 ···Valve cap 101 ··· Female thread portion; 200 ···First copper bush; 200' ···Second copper bush; A: First valve seat connecting pipe unit; B ···Second valve seat connecting pipe unit; C: third mounting member; D: first mounting member; E Second mounting part.

Claims

1. A control valve, a housing, a first valve seat, and a first connecting pipe; The first valve seat is formed by pressing or drawing a metal material; the first valve seat includes a first base, a first connecting portion and a second connecting portion; the first base is annular, the first connection portion is tubular and extends from an outer edge of the first base toward the housing; The second connection portion is tubular and extends from an inner edge portion of the first base toward the first connection pipe. the housing is fixedly connected to the first connection portion; A control valve, wherein the first connecting pipe is fixedly connected to the second connecting portion.

2. The first connection portion and the second connection portion are coaxially arranged, The control valve according to claim 1 , wherein an inner diameter size of the first connecting portion is larger than an outer diameter size of the second connecting portion.

3. Further comprising a valve body and a first gasket; the valve body is located in a cavity of the control valve; the first valve seat includes an inner step portion having a step surface facing the valve body, the inner step portion is composed of the first base and the first connection portion, 2. The control valve according to claim 1, wherein the first gasket is provided on the inner step and supports the valve body.

4. 4. The control valve according to claim 3, wherein the inner step portion has a recessed groove located at a connection portion between the first base and the first connecting portion.

5. the first gasket includes a chamfered portion; 4. The control valve according to claim 3, wherein the chamfered surface of the chamfered portion faces a connection point between the first base and the first connection portion.

6. The first gasket further includes a first receiving groove, An opening of the first accommodating groove faces the first base, the control valve further includes a first sealing ring; 6. The control valve according to claim 5, wherein the first sealing ring is positioned in the first receiving groove, abuts against a groove wall that defines the first receiving groove, and abuts against the first base.

7. the first connecting pipe includes a first engaging segment that is fitted onto the second connecting portion; the second connection portion includes a protruding portion located on an outer circumferential surface of the second connection portion, 2. The control valve according to claim 1, wherein the first engagement segment is fixed to the ridge portion by welding.

8. The housing includes a body portion and a protrusion portion. The protrusion protrudes from a circumferential outer wall of the main body, The main body is cylindrical, The protrusion is annular, The main body portion is fixed to the first connection portion by welding, An outer peripheral wall of the first connection portion is gap-fitted into an inner wall of the housing, The control valve further includes a joint. the joint includes an outer step with a step surface facing downward; The protrusion contacts a step surface of the outer step portion, a step wall of the outer step is located in the cavity of the protrusion; The control valve according to any one of claims 1 to 7, wherein the protrusion is fixed to the outer step by welding.

9. Further comprising a valve disc and a valve stem; The joint includes a through hole, The valve stem is inserted through the through hole and connected to the valve body by a key groove; the joint includes an integrally molded lower step; The valve stem includes a valve stem step having an upwardly facing step surface, 9. The control valve of claim 8, wherein the valve stem step abuts the lower step to limit upward movement of the valve stem along a longitudinal direction of the control valve.

10. the housing, the first valve seat and the first connecting tube are manufactured from a stainless steel material; the first valve seat is fixed to the first connecting pipe by in-furnace welding; 8. The control valve according to claim 1, wherein the housing is fixed to the first valve seat by laser welding.

11. further comprising a second valve seat and a second connecting pipe; The second valve seat is formed by pressing or stretching a metal plate material; the second valve seat includes a second base, a third connection portion, and a fourth connection portion; the second base is annular, the third connection portion is tubular and extends from an outer edge portion of the second base toward the housing; the fourth connection portion is tubular and extends from an inner edge portion of the second base toward the second connection pipe; The housing is fixed to the third connection portion by welding, the second connecting tube includes a second engaging segment; 2. The control valve according to claim 1, wherein the second engagement segment is fitted onto the fourth connection portion and fixed to the fourth connection portion by welding.

12. A method for manufacturing a control valve, comprising the steps of: A step of manufacturing a housing, a first valve seat, and a second valve seat by machining the housing, the first valve seat, and the second valve seat using steel materials, the first valve seat includes a first base, a first connecting portion and a second connecting portion; the first base is annular, The first connection portion is tubular, The second connection portion is tubular, the first connection portion and the second connection portion are located on different sides of the first base, The first connecting portion has an inner diameter larger than an outer diameter of the second connecting portion, the second valve seat includes a second base, a third connection portion, and a fourth connection portion; the second base is annular, the third connection portion is tubular; the fourth connection portion is tubular; the third connection portion and the fourth connection portion are located on different sides of the second base, an inner diameter size of the third connection portion being larger than an outer diameter size of the fourth connection portion; providing a first connecting pipe and a second connecting pipe, assembling a first valve seat connecting pipe unit, and welding and fixing the first connecting part to the first connecting pipe; assembling a second valve seat connecting pipe unit, and welding and fixing the third connecting part to the second connecting pipe; assembling the housing, the first valve seat connecting pipe unit, and the second valve seat connecting pipe unit, welding and fixing the second connecting portion to the housing, and welding and fixing the fourth connecting portion to the housing.

13. a first gasket and a first sealing ring, the first gasket being provided with a first receiving groove, the first sealing ring being disposed in the first receiving groove before the second connecting portion is welded to the housing, and the first gasket and the first valve seat connecting pipe unit being mounted as a first mounting member, whereby an outer peripheral wall of the first gasket and an inner peripheral wall of the second connecting portion are tightly fitted together, and at least a portion of the second connecting portion is inserted into the housing; 13. The method for manufacturing a control valve according to claim 12, further comprising: providing a second gasket; and before the fourth connecting portion is welded to the housing, attaching the second gasket and the second valve seat connecting pipe unit, thereby causing an outer peripheral wall of the second gasket to be tightly fitted with an inner peripheral wall of the fourth connecting portion, and causing at least a portion of the fourth connecting portion to enter the housing.

14. 14. The method of claim 13, further comprising providing a second sealing ring, the second gasket having a second receiving groove, and disposing the second sealing ring in the second receiving groove, and then mounting the second gasket and the second valve seat connecting pipe unit to form a second mounting member.

15. the first gasket includes a chamfered portion toward a connection portion between the first base and the second connection portion, or a groove is formed by pressing the first valve seat; The method for manufacturing a control valve according to claim 13, wherein the groove is located at a connection portion between the first base and the second connection portion.

16. The housing is manufactured by processing using a steel material, and the housing includes a main body and a protrusion; The protrusion is manufactured by pressing and flanging, and at least a portion of the second connection portion is inserted into the cavity of the main body portion; The method for manufacturing a control valve according to any one of claims 12 to 15, wherein the main body portion is welded and fixed to the second connecting portion by laser welding.

17. 17. The method of claim 16, further comprising the steps of: providing a stop ring; and manufacturing a joint by turning a steel material, the joint including an upper step having an upper step surface facing upward and an outer step surface facing downward; disposing the stop ring on the upper step and welding and fixing the stop ring to the joint by laser welding; and inserting a portion of the joint into the cavity of the protrusion, whereby the protrusion contacts the step surface of the outer step surface; and welding and fixing the housing to the joint by laser welding.

18. The valve stem is manufactured by processing using a steel material, and the extension direction of the first base coincides with the length direction of the valve stem; The extension direction of the second base coincides with the length direction of the valve stem, The valve stem includes a cylindrical portion, a first key portion located above the cylindrical portion, and a second key portion located below the cylindrical portion, The first key portion and the cylindrical portion constitute a valve stem step portion, The joint further includes a lower step having a step surface facing downward; Before the second connecting portion is welded to the housing, or before the fourth connecting portion is welded to the housing, the valve rod is attached from one open end of the housing, so that the valve rod passes through the through hole of the joint, and the valve rod step is abutted against the lower step; 18. The method of claim 17, further comprising providing a valve body and attaching the valve body to an open end of the housing such that the second key portion is fitted into a groove of the valve body to form a third mounting member.

19. When the first valve seat and the second valve seat are welded to the housing, a jig is used to position the third mounting member relative to the joint, and a synchronous operating mechanism is used to simultaneously move the first mounting member and the second mounting member by a predetermined distance toward the valve body, thereby causing a part of the first valve seat to enter the cavity of the main body; the first gasket is abutted against the valve body, thereby causing a portion of the second valve seat to enter into a cavity of the main body; The method for manufacturing a control valve according to claim 18, wherein the second gasket is in contact with the valve body.

20. The outer peripheral wall of the joint includes a male thread portion, and is manufactured by processing a valve cap using a steel material; The inner peripheral wall of the valve cap includes a female thread portion, and the valve cap is screwed into the joint, The method for manufacturing a control valve according to claim 19, wherein the valve cap and the joint are fixed to each other by screwing the female thread portion and the male thread portion together.

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