A method of manufacturing a control valve

Abstract

The application discloses a manufacturing method of a control valve, wherein a shell is made of steel material, and the shell corresponds to the valve body in the background art; compared with the valve body made of brass material in the background art, the manufacturing cost is low.

Description

Technical Field

[0001] This invention relates to the field of fluid control technology, and more specifically to a method for manufacturing a control valve. Background Technology

[0002] In refrigeration systems, ball valves are used to control the flow of fluid.

[0003] Figure 1 The image shown is a cross-sectional schematic diagram of a ball valve in the background art. For example... Figure 1 As shown, the ball valve includes a valve body 01, a valve seat 02, a first connecting pipe 03, a second connecting pipe 04, a valve stem 05, and a valve core 06. The valve body 01 is fixedly connected to the valve seat 02, the valve body 01 is fixedly connected to the first connecting pipe 03, and the valve seat 02 is fixedly connected to the second connecting pipe 04. Rotating the valve stem 05 drives the valve core 06 to rotate, thus opening and closing the valve. In this ball valve, the blank of the valve body 01 is forged from brass, resulting in high manufacturing costs.

[0004] In view of this, how to reduce the manufacturing cost of ball valve bodies has become a research topic for those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a method for manufacturing a control valve, comprising: step 10: processing a housing using steel; processing a first valve seat, a second valve seat, and a valve head using steel; step 20: fixing the valve head, the housing, and the first valve seat together by welding as a first component A; step 30: assembling the first component A and the second valve seat, wherein at least part of the second valve seat extends into the housing, and the housing and the second valve seat are fixedly connected by welding.

[0006] The manufacturing method of the control valve provided by the present invention uses a shell made of steel. The shell of this solution is equivalent to the valve body in the prior art. Compared with the valve body in the prior art which is forged from brass, the manufacturing cost of this solution is low. Attached Figure Description

[0007] Figure 1 Background Art: A cross-sectional schematic diagram of a control valve;

[0008] Figure 2 : A cross-sectional schematic diagram of a control valve provided by the present invention;

[0009] Figure 3 : Figure 2 A schematic diagram of the structure of the first component A before assembly;

[0010] Figure 4 : A schematic diagram of the first component A assembled with the valve stem, valve core and first sealing gasket;

[0011] Figure 5: Figure 2 A schematic diagram of the structure of the second component B;

[0012] Figure 6 : Schematic diagram of the second component B and the second sealing gasket after assembly;

[0013] Figure 7 : A schematic diagram of another first component A' provided by the present invention after being assembled with the valve stem, valve core and first sealing gasket.

[0014] Figures 2 to 7 middle:

[0015] 11-Shell, 111-Body part, 112-Extended part;

[0016] 1121 - Upper end face, 113 - Outer edge face;

[0017] 2-Valve seat assembly;

[0018] 21-First valve seat, 211-Step portion of first valve seat;

[0019] 212-First step section, 2121-Step surface, 213-Valve seat annular groove;

[0020] 22-Second valve seat, 221-Second valve seat step portion;

[0021] 23 - First takeover, 24 - Second takeover;

[0022] 25 - First sealing gasket, 26 - Second sealing gasket;

[0023] 3-Valve head assembly;

[0024] 31-Valve head, 311-Second step portion, 312-Extension portion, 313-External thread portion;

[0025] 32-Stop ring;

[0026] 4-Valve stem assembly, 41-Valve stem;

[0027] 411-First annular groove, 412-Second annular groove, 413-Key;

[0028] 42 - First O-ring; 43 - Second O-ring;

[0029] 5-Valve core, 51-Groove, 6-Valve cap, 61-Internal thread, 7-Weld ring;

[0030] A - First component, B - Second component. Detailed Implementation

[0031] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0032] It should be noted that the directional terms such as "up" and "down" used in this article are in the context of... Figures 2 to 7 The directional terms used in this document, defined by their location in the diagram and their relative positions, are merely for clarity and convenience in illustrating the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0033] Figure 2 A cross-sectional schematic diagram of a control valve provided by the present invention; Figure 3 for Figure 2 A schematic diagram of the structure of the first component A before assembly; Figure 4 This is a schematic diagram showing the first component A assembled with the valve stem, valve core, and first sealing gasket. Figure 5 for Figure 2 A schematic diagram of the structure of the second component B; Figure 6 This is a schematic diagram of the second component B and the second sealing gasket after assembly.

[0034] It should be noted that the housing 11, first valve seat 21, second valve seat 22, first connecting pipe 23, second connecting pipe 24, valve head 31, valve core 5 and valve cap 6 in this embodiment are made of steel, specifically stainless steel.

[0035] like Figures 2 to 6 As shown, the specific manufacturing process of the above control valve is as follows:

[0036] Step 10: Prepare the housing 11. The housing 11 includes a main body 111 and a protruding part 112. The housing 11 is made of steel. Specifically, a stainless steel tube is first cut into a housing blank, and then the housing blank is stamped and flanged to form the protruding part 112. Alternatively, it can be made from stainless steel sheet. First, the stainless steel sheet needs to be rolled into a tube shape, and the subsequent processes are the same as for the tube. Prepare the first valve seat 21, the second valve seat 22, the first connecting pipe 23, the second connecting pipe 24, the first sealing gasket 25, and the second sealing gasket 26. The first valve seat 21 and the second valve seat 22 are machined from stainless steel profiles. The first valve seat 21 has a machined stepped surface facing the valve core 5, and the second valve seat 22 has a machined stepped surface facing the valve core 5, and the second valve seat 22 has a machined stepped surface facing the valve core 5, and the first connecting pipe 23 and the second connecting pipe 24 are made of stainless steel pipes. It should be noted that in the actual production process, in order to facilitate matching and welding with the customer's copper connecting pipe, copper bushings can be welded to the connection ends of the first connecting pipe 23 and the second connecting pipe 24. The first sealing gasket 25 and the second sealing gasket 26 are made of materials such as PTFE, PEK, and high-temperature nylon.

[0037] A valve head 31 and a stop ring 32 are prepared. The valve head 31 is generally hollow cylindrical and is machined from a stainless steel profile. The valve head 31 includes a second step portion 311 with the stepped surface facing upward and an extension portion 312 extending axially upward from the second step portion 311. The stop ring 32 is placed in the second step portion 311. The outer peripheral wall of the valve head 31 is machined with an external thread portion 313.

[0038] A valve stem 4 is prepared. The valve stem 4 includes a stem body 41, a first O-ring 42, and a second O-ring 43. The valve stem 41 is machined from stainless steel bar stock. The stem body 41 includes a first annular groove 411, a second annular groove 412, and a key portion 413. The first O-ring 42 is fitted into the first annular groove 411, and the second O-ring 43 is fitted into the second annular groove 412.

[0039] The valve core 5 and valve cap 6 are prepared. The valve core 5 and valve cap 6 are made of stainless steel. The inner circumferential wall of the valve cap 6 is machined with an internal thread 61.

[0040] Step 20: The valve head 31, housing 11, first valve seat 21 and first connecting pipe 23 are fixedly connected by furnace brazing as the first component A. Specifically, the first valve seat 21 extends at least partially into the body part 111, the valve head 31 extends partially into the extension part 112, and the first valve seat 21 and the body part 111, and the valve head 31 and the extension part 112 are fixed by furnace brazing in one go.

[0041] The second valve seat 22 and the second pipe 24 are fixedly connected by brazing in the furnace as the second component B.

[0042] Step 30: Install the valve stem 4 into the first component A, place the stop ring 32 on the second step 311 of the valve head 31, and rivet the stop ring 32 with the extension 312 so that the stop ring 32 is fixedly connected to the valve head 31. The stop ring 32 can restrict the upward movement of the valve stem 41 and can restrict the circumferential rotation stroke of the valve stem 41. Then, place the first sealing gasket 25 on the first valve seat step 211 and then install the valve core 5. The key part 413 of the valve stem 4 extends into the housing 11 and cooperates with the keyway of the groove 51 of the valve core 5.

[0043] After the second sealing gasket 26 is placed on the second valve seat step 221 of the second component B, it is then assembled with the first component A. The second valve seat 22 extends at least partially into the housing 11, and the housing 11 and the second valve seat 22 are fixedly connected by laser welding. It is conceivable that the housing 11 and the second valve seat 22 can also be connected by argon arc welding, gas shielded welding, etc.

[0044] Step 40: Screw the valve cap 6 into the valve head 31 to form a control valve. The valve cap 6 and the valve head 31 are fixedly connected by the engagement of the external thread 313 and the internal thread 61.

[0045] The housing in this embodiment is made of stainless steel tubing or sheet metal. This housing is equivalent to the valve body in the prior art. Compared with the valve body in the prior art which is forged from brass, this solution has lower manufacturing cost and is easier to process.

[0046] Figure 7 This is a schematic diagram of another first component A' provided by the present invention assembled with the valve stem, valve core and first sealing gasket.

[0047] As a design change, such as Figure 7 As shown, the valve head 31 does not have the aforementioned extension 312. First, the stop ring 32 is placed on the second step 311' of the valve head 31', and then the stop ring 32 is welded to the valve head 31' by laser welding. Thus, compared with the above embodiment, the connection between the valve head 31' and the stop ring 32 is more reliable in this solution.

[0048] Furthermore, such as Figure 2 , Figure 3 As shown, step 10 further includes: machining the valve seat annular groove 213 and the first step portion 212 with the stepped surface facing the valve core 5 on the first valve seat 21, and preparing the welding ring 7; step 20 further includes: after placing the welding ring 7 in the valve seat annular groove 213, the housing 11 and the first valve seat 21 are press-fitted together with an interference fit, so that the step surface 2121 of the first step portion 212 abuts against the outer edge surface 113 of the body portion 111 for pre-positioning, and then the first valve seat 21 and the housing 11 are fixed by furnace brazing. Its beneficial effect is that by setting the first step portion 212 for pre-positioning, the assembly accuracy of the control valve can be improved.

[0049] Meanwhile, in step 20 above, the valve head 31 extends into the protrusion 112, and after the welding ring 7 is placed on the upper end face 1121 of the protrusion 112, the valve head 31 and the housing 11 are fixed by brazing in a furnace.

[0050] The manufacturing method of the control valve in this embodiment uses stainless steel for most of the components, which meets the requirements for lead content in control products in today's society. The components are fixed by welding multiple parts at once, which is simple and easy to process. The components are fixed and connected by furnace brazing and laser welding, which eliminates the need for acid pickling and makes the production process clean and environmentally friendly.

[0051] This article uses specific examples to illustrate the principles and implementation methods of the present invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make several 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 protection scope of the claims of the present invention.

Claims

1. A method for manufacturing a control valve, characterized in that, include: Step 10: Fabricate a housing using steel, the housing comprising a body portion; fabricate a first valve seat, a second valve seat, a valve head, and a valve core using steel. Step 20: The valve head, the housing, and the first valve seat are fixedly connected by welding to form the first component A; Step 30: Assemble the first component A and the second valve seat, with the second valve seat extending at least partially into the housing, and the housing and the second valve seat being fixedly connected by welding; Step 10 further includes: machining the valve seat annular groove and the first step portion with the stepped surface facing the valve core on the first valve seat, wherein the valve seat annular groove is a V-shaped groove, and preparing the first weld ring; Step 20 further includes: placing the first weld ring in the valve seat annular groove, pressing the first valve seat and the body portion together with an interference fit, so that the stepped surface of the first step portion abuts against the outer edge surface of the body portion, and then fixing the first valve seat and the housing by furnace brazing.

2. The method for manufacturing the control valve as described in claim 1, characterized in that, In step 10, steel is used to process and prepare the first connecting pipe, the second connecting pipe, and the valve stem. In step 20, the valve head, the housing, the first valve seat, and the first connecting pipe are fixedly connected by furnace brazing to form the first component A, and the second valve seat and the second connecting pipe are fixedly connected by furnace brazing to form the second component B. In step 30, after the valve stem and the valve core are installed into the first component A, they are assembled with the second component B.

3. The method for manufacturing the control valve as described in claim 2, characterized in that, In step 10, the housing is prepared using stainless steel tubing or sheet metal. The housing also includes an extension portion, which is made by stamping and flanging stainless steel tubing. In step 20, the first valve seat extends at least partially into the body portion, and the valve head extends partially into the extension portion. The first valve seat and the body portion, as well as the valve head and the extension portion, are fixed together in one step by furnace brazing.

4. The method for manufacturing the control valve as described in claim 3, characterized in that, Step 10 further includes: preparing a second welding ring; in step 20: the valve head portion is inserted into the protrusion, the second welding ring is placed on the upper end face of the protrusion, and the valve head and the housing are fixed by furnace brazing.

5. The method for manufacturing the control valve as described in claim 2, characterized in that, Step 10 further includes: the valve head is machined from a stainless steel profile, and a second step portion with the stepped surface facing upward and an extension portion extending upward from the second step portion are machined to prepare a stop ring; Step 30 further includes: after the valve stem is installed, the stop ring is placed on the second step portion, and the extension portion is riveted to the stop ring so that the stop ring is fixed to the valve head.

6. The method for manufacturing the control valve as described in claim 2, characterized in that, Step 10 further includes: the valve head is machined from a stainless steel profile, and a second step portion with the stepped surface facing upward is machined on the valve head to prepare a stop ring; Step 30 further includes: after the valve stem is installed, the stop ring is placed on the second step portion, and the stop ring is fixed to the valve head by welding.

7. The method for manufacturing the control valve as described in claim 2, characterized in that, Step 10 further includes: preparing a first sealing gasket and a second sealing gasket, machining a first valve seat step portion on the first valve seat, and machining a second valve seat step portion on the second valve seat; Step 30 further includes placing the first sealing gasket on the first valve seat step portion, then installing the valve stem and the valve core into the first component A, placing the second sealing gasket on the second valve seat step portion, and then assembling the first component A and the second component B.

8. A method for manufacturing a control valve according to any one of claims 1-7, characterized in that, Step 10 further includes: machining an external thread on the outer peripheral wall of the valve head; and machining an internal thread on the inner peripheral wall of the valve cap using steel. It also includes step 40: screwing the valve cap into the valve head, wherein the valve cap and the valve head are fixed together by the internal thread and the external thread.

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