Control valve

Abstract

The control valve comprises a flow slowing part, the flow slowing part is located below a sliding fit part, the flow slowing part comprises an annular flow slowing part, at least part of the flow slowing part is located between the outer wall of a reducing part and the inner wall of a barrel, the flow slowing part comprises a communicating hole, and the outer wall of the flow slowing part is in clearance fit with the inner wall of the barrel; the inner wall of the slow flow part is in clearance fit with the outer wall of the reducing part, the control valve comprises a valve port and a fluid outlet, the gap between the inner wall of the slow flow part and the outer wall of the reducing part is defined as Q2, the gap between the inner wall of the barrel and the outer wall of the sliding fit part is defined as Q3, and the gap between the outer wall of the slow flow part and the inner wall of the barrel is defined as Q4; when the valve element opens the valve port, the communicating hole, the valve port and the fluid outlet are communicated. In addition, the gap Q4, the gap Q2, the valve port and the fluid outlet are communicated, and the control valve in the scheme can improve noise generated by attraction of the movable iron core and the static iron core.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and in particular to a control valve. Background Art

[0002] A control valve is a valve that can be used in refrigeration, cold storage and freezing systems. Figure 1 The figure shows a schematic diagram of the structure of a control valve in the background technology. Figure 1a Shown Figure 1 A partial enlarged view of Figure 1b Shown Figure 1a A local enlarged view of I1 in the middle.

[0003] As shown in the figure, the control valve includes a sleeve 010 and a coil 020 arranged outside the sleeve 010 , and a static iron core 01 and a moving iron core 02 are arranged inside the sleeve 010 .

[0004] When the coil 020 is energized, the moving iron core 02 moves upward under the action of the electromagnetic force and is attracted to the stationary iron core 01. When the coil is de-energized, the moving iron core 02 is separated from the stationary iron core 01 and moves downward under the action of the spring force.

[0005] In a pulse cycle (for example, 6s), the flow rate can be controlled by controlling the different on and off times of the coil (for example, on time: off time = 3:1, at which time the corresponding flow opening is 75%).

[0006] Under such control, the control valve needs to be opened and closed frequently to achieve the purpose of real-time flow regulation. Figure 1b As shown, the outer surface structure of the moving iron core 02 is designed to be threaded. In the process of the moving iron core 02 moving upward and engaging with the static iron core 01, the fluid resistance is increased for the fluid flowing through the moving iron core 02 and the sleeve 010, so that the speed of the fluid in the cavity between the moving iron core 02 and the static iron core 01 is slowed down, causing the upward movement speed of the moving iron core 02 to slow down, thereby reducing the impact noise generated during the engagement.

[0007] In order to reduce the impact noise generated when the moving iron core 02 and the stationary iron core 01 are attracted, the above-mentioned control valve has a thread 030 processed on the outer wall of the moving iron core 02, and the damping effect generated by the thread is used to increase the fluid resistance, which makes the processing of the moving iron core 02 more difficult and inefficient. Summary of the invention

[0008] An object of the present invention is to provide a control valve.

[0009] The control valve provided by the present invention comprises a valve body component and an actuating component, wherein the valve body component comprises a static iron core and a cylinder, wherein the static iron core is fixedly connected to the cylinder, and the actuating component comprises a moving iron core and a valve core, wherein the moving iron core comprises a sliding fitting portion and a reduced diameter portion, wherein the outer diameter of the sliding fitting portion is larger than the outer diameter of the reduced diameter portion, and the outer wall of the sliding fitting portion is slidingly fitted with the inner wall of the cylinder in a clearance;

[0010] The control valve further comprises a flow-slowing member, the flow-slowing member is located below the sliding fitting portion, the flow-slowing member comprises a flow-slowing portion, the flow-slowing portion is annular, the flow-slowing portion is at least partially located between the outer wall of the reduced diameter portion and the inner wall of the cylinder, the flow-slowing portion comprises a connecting hole, the outer wall of the flow-slowing portion is in clearance with the inner wall of the cylinder, and the inner wall of the flow-slowing portion is in clearance with the outer wall of the reduced diameter portion.

[0011] The control valve includes a valve port and a fluid outlet, wherein the gap between the inner wall of the slow-flow portion and the outer wall of the reduced-diameter portion is defined as Q2, the gap between the inner wall of the cylinder and the outer wall of the sliding fitting portion is defined as Q3, and the gap between the outer wall of the slow-flow portion and the inner wall of the cylinder is defined as Q4. The gap Q4 connects the gap Q3 and the connecting hole. When the valve core opens the valve port, the connecting hole, the valve port and the fluid outlet are connected; and the gap Q4, the gap Q2, the valve port and the fluid outlet are connected.

[0012] The control valve of the above scheme improves the noise when the moving iron core and the static iron core are attracted by providing a slow-flow component. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Shown is a structural schematic diagram of a control valve in the background technology;

[0014] Figure 1a Shown Figure 1 A partial enlarged view of the

[0015] Figure 1b Shown Figure 1a A local enlarged view of I1 in the middle;

[0016] Figure 2 The figure shows a schematic structural diagram of a control valve according to an embodiment of the present invention in a fully closed state;

[0017] Figure 2A Shown Figure 2 Middle partial enlarged picture;

[0018] Figure 2B Shown Figure 2A A local enlarged view of the X1 point in the middle;

[0019] Figure 3 Shown Figure 2 The schematic diagram of the structure of the control valve in the half-open state (the coil is omitted);

[0020] Figure 3A Shown Figure 3 Middle partial enlarged picture;

[0021] Figure 4 Shown Figure 2 The schematic diagram of the structure of the control valve in the fully open state (the coil is omitted);

[0022] Figure 4A Shown Figure 4 A partial enlarged view. DETAILED DESCRIPTION

[0023] The present invention will be described in further detail below with reference to the accompanying drawings.

[0024] Figure 2 The figure shows a schematic diagram of the structure of an embodiment of the control valve of the present invention in a fully closed state. Figure 2A Shown Figure 2 The X-partial enlarged image, Figure 3 Shown Figure 2 The schematic diagram of the control valve in the half-open state is shown. Figure 3A Shown Figure 3 Middle partial enlarged picture; Figure 4 Shown Figure 2 The schematic diagram of the structure of the control valve in the fully open state is shown in FIG. Figure 4A Shown Figure 4 A partial enlarged view.

[0025] As shown in the figure, the control valve includes a valve body component 100 , and an actuating component 200 and a valve seat component 300 disposed in the valve body component 100 .

[0026] As shown in the figure, in this embodiment, the valve body component 100 includes a static iron core 101, a cylinder 102, a connector 103 and a valve body 104. Among them, when the cylinder 102 is used as a part, it is a cylinder with an axial through hole, and its inner wall is cylindrical. The static iron core 101 and the cylinder 102 are welded and fixed, so that one end of the cylinder 102 is blocked. When the connector 103 is used as a part, it also has an axial through hole, the lower end of the cylinder 102 is located in the connector 103, and the upper ends of the cylinder 102 and the connector 103 are welded and fixed. The connector 103 is threadedly connected to the valve body 104.

[0027] The above-mentioned static iron core 101 , cylinder 102 , connector 103 and valve body 104 are connected to form a valve cavity 400 of the control valve, and the actuating component 200 and valve seat component 300 are located in the valve cavity 400 .

[0028] As shown in the figure, the actuating component 200 includes a moving iron core 201, a first spring 202, a second spring 203 and a valve core 204. One end of the first spring 202 abuts against the stationary iron core 101, and the other end thereof abuts against the moving iron core 201. One end of the second spring 203 abuts against the moving iron core 201, and the other end abuts against the valve core 204. In this embodiment, the lower part of the moving iron core 201 has a stepped hole 2011, and the stepped hole 2011 includes a large diameter hole 20111 and a small diameter hole 20112. The inner diameter of the large diameter hole 20111 is greater than the inner diameter of the small diameter hole 20112. The second spring 203 is installed in the small diameter hole 20112 and is partially located in the large diameter hole 20111 in the valve open state. The valve core 204 is at least partially located in the large diameter hole 20111. Under the action of external force, the valve core 204 can be displaced axially relative to the moving iron core 201 in the axial direction of the moving iron core 201.

[0029] The valve core 204 is installed as follows: the actuating component 200 includes a stopper 205 , which may be a clamping ring. The stopper 205 is riveted and fixed to the lower end of the moving iron core 201 .

[0030] The valve core 204 includes a large diameter section 2043 and a small diameter section 2044. The outer wall of the large diameter section 2043 and the outer wall of the small diameter section 2044 are circular. The large diameter hole 20111 of the stepped hole 2011 is a circular hole. The outer wall of the large diameter section 2043 is slidably matched with the large diameter hole 20111. The outer diameter of the small diameter section 2044 is smaller than the outer diameter of the large diameter section 2043. When the control valve is in the open state, the small diameter section 2044 is partially located outside the large diameter hole 20111. In this embodiment, the valve core 204 is made of plastic material, and its small diameter section 2044 can abut against the valve port.

[0031] The valve seat component 300 includes a valve seat 301, the valve seat 301 includes a valve port 3010, and the valve seat 301 is threadedly connected to the valve body 104. Since the connector 103 is threadedly connected to the valve body 104, and the valve body 104 is threadedly connected to the valve seat 301, the valve seat 301 of the control valve can be replaced according to the use needs. Specifically, as shown in the figure, the valve body 104 includes a valve body portion 1041 and an inner protrusion 1042, and the valve body portion 1041 has a first threaded portion 10411, and the first threaded portion 10411 is threadedly connected to the lower threaded portion 1031 of the connector 103. The inner protrusion 1042 is cylindrical and has an axially penetrating insertion hole 10420. The valve seat 301 has an insertion portion 3011, and the insertion portion 3011 is threadedly connected to the inner protrusion 1042. As shown in the figure, the insertion portion 3011 has an external thread, and the inner protrusion 1042 has an internal thread. The valve seat 301 has a valve opening portion 3012 located in the valve cavity 400, and the valve opening portion 3012 has the aforementioned valve opening 3010. Specifically, in this embodiment, the valve seat 301 is in the shape of a long cylinder and has an axial through hole 3001.

[0032] like Figure 2-4 As shown, the valve body 1041 includes a cylindrical portion 10410, the cylindrical portion 10410 includes the aforementioned first threaded portion 10411, and also includes a non-threaded portion 10412 located below the first threaded portion 10411, and the first threaded portion 10411 is threadedly connected to the connector 103. The non-threaded portion 10412 is located at the lower side of the first threaded portion 10411, the valve body 104 includes an annular groove 1040 located between the inner wall of the non-threaded portion 10412 and the outer wall of the inner protrusion 1042, the cylindrical filter 500 is located in the valve cavity 400, the filter 500 is sleeved on the outer periphery of the valve seat 301, one end of the filter 500 abuts against the bottom wall of the annular groove 1040, and the other end of the filter 500 abuts against the lower threaded portion 1031 of the connector 103, so that the filter 500 is limited in the valve cavity 400. The filter element 500 can filter the fluid entering the control valve from the fluid inlet M described below.

[0033] Figure 2 The figure shows the structure of the control valve in the fully closed state. When the coil 900 is energized, the moving iron core 201 moves upward under the action of the electromagnetic force and is attracted to the stationary iron core 101, the valve core 204 is separated from the valve port 3012, and the valve port 3010 of the control valve is opened. When the coil 900 is de-energized, the moving iron core 201 is separated from the stationary iron core 101 and moves downward under the action of the first spring 202 and its own gravity, the valve core 204 is against the valve port 3012, and the valve port 3010 of the control valve is closed.

[0034] The control valve is not only a solenoid valve, but also can be used as an expansion valve for regulating flow in conjunction with an external controller. When the expansion valve is used, the flow is controlled by an external controller in a pulse cycle (e.g. 6S) by controlling different on and off times (e.g., on time 4S, off time 2S, corresponding flow opening is 75%). Thus, the control valve can be used as both a solenoid valve and an expansion valve for regulating flow.

[0035] Whether used as a solenoid valve or an expansion valve, it needs to be opened and closed frequently. Figure 2 and Figure 2A , Figure 3As shown, the control valve includes a first fluid port M and a second fluid port N for fluid inlet and outlet. In this embodiment, the control valve specifically includes a first connecting pipe 9 and a second connecting pipe 10 welded to the valve body 104, the first connecting pipe 9 has the aforementioned first fluid port M, and the second connecting pipe 10 has the aforementioned second fluid port N. It should be noted here that the first fluid port M and the second fluid port N are not limited to the aforementioned structure, and the first fluid port M and the second fluid port N can also be directly formed on the valve body 104 itself according to the needs of use. The first fluid port M is a fluid inlet, and the second fluid port N is a fluid outlet. The axial through hole 3011 connects the valve port and the fluid outlet. When the valve port 3010 is opened, the first fluid port M is connected to the second fluid port N through the axial through hole 3011 of the valve seat 301.

[0036] Since the moving iron core 201 needs to slide axially relative to the cylinder 102, the outer wall of the moving iron core 201 and the inner wall of the cylinder 102 are in sliding fit. Figure 2 and Figure 2A As shown, a back pressure chamber P is formed between the moving iron core 201 and the stationary iron core 101 , and the fluid entering the valve chamber 400 from the first fluid port M can flow to the back pressure chamber P through the gap between the moving iron core 201 and the cylinder 102 .

[0037] In the control valve Figure 2 The fully closed state shown Figure 4 During the fully open state operation shown in the figure, the moving iron core 201 is displaced in the direction of attraction with the static iron core 101 under the action of electromagnetic force. The fluid at the back pressure chamber P will automatically flow through the gap between the outer wall of the iron core 201 and the inner wall of the cylinder 102, and then flow to the second fluid port N through the valve port 3010. The gap between the outer wall of the moving iron core 201 and the inner wall of the cylinder 102 is defined as Q3, and its flow area is S3. In this process, if the fluid in the back pressure chamber P flows out quickly, the moving iron core 201 and the static iron core 101 will be attracted quickly, which is easy to generate attraction noise. However, the gap Q3 between the outer wall of the moving iron core 201 and the inner wall of the cylinder 102 cannot be set too small, so as to avoid interference between the moving iron core 201 and the valve body 102, which will affect the reliability of the axial sliding of the moving iron core 201. For this reason, the control valve is designed with a slow flow mechanism. Figure 3 In the illustrated embodiment, the flow slowing mechanism is specifically a flow slowing member 6 .

[0038] like Figure 3 , Figure 4As shown, the slow flow member 6 includes a slow flow portion 61, and the moving iron core 201 includes a sliding fitting portion 2013 and a reduced diameter portion 2014 located below the sliding fitting portion 2013. The outer wall of the sliding fitting portion 2013 is circular, and its outer diameter is D3. The outer wall of the reduced diameter portion 2014 is circular, and the outer diameter of the reduced diameter portion 2014 is smaller than the outer diameter of the sliding fitting portion 2013, and its outer diameter is D2. The sliding fitting portion 2013 and the cylinder 102 are in a clearance sliding fit, and the clearance between the outer wall of the sliding fitting portion 2013 and the inner wall of the cylinder 102 is the aforementioned clearance Q3, and its flow area is the aforementioned flow area S3.

[0039] The slow flow portion 61 is located below the sliding fitting portion 2013 of the moving iron core 201. The slow flow portion 61 is annular, and its outer diameter is D4. At least part of it is located between the outer wall of the reduced diameter portion 2014 and the inner wall of the cylinder 102. Specifically, the outer wall of the slow flow portion 61 is gap-matched with the inner wall of the cylinder 102. Here, the gap between the outer wall of the slow flow portion 61 and the inner wall of the cylinder 102 is defined as Q4, and its flow area is S4. The inner wall of the slow flow portion 61 is gap-matched with the outer wall of the reduced diameter portion 2014. Here, the gap between the inner wall of the slow flow portion 61 and the outer wall of the reduced diameter portion 2014 is defined as Q2, and its flow area is S2. The slow flow portion 61 also includes a connecting hole 610, and the connecting hole 610 connects the gap Q4 and the gap Q2. The flow area of ​​the connecting hole 610 is defined as S1. In this embodiment, the connecting hole 610 is specifically a radial through hole whose center is perpendicular to the axial direction of the slow flow portion 61, which is easy to process.

[0040] In this design, as shown in the figure, the control valve is Figure 2 The fully closed state shown Figure 4 During the fully open state operation, that is, when the valve core 204 opens the valve port 3010, the fluid in the back pressure chamber P flows downward from the gap Q3 due to the displacement of the moving iron core 201 toward the static iron core 101. The fluid flowing out from the gap Q3 will be split into two paths of fluid before flowing to the valve port 3010. One path is the fluid flowing out from the gap Q3 through the gap Q2 and then through the valve port 3010, and the other path is the fluid flowing out from the gap Q3 through the gap Q4 and the connecting hole 610 and then through the valve port 3010. During the splitting process, the flow rate of the fluid is slowed down, so that the slow flow mechanism can play a blocking role on the outflow of the fluid in the back pressure chamber P, slow down the speed of the moving iron core 201 and the static iron core 101 to be attracted, and reduce the impact force when the moving iron core 201 and the static iron core 101 are attracted, thereby reducing noise.

[0041] The above area relationships satisfy: S1≤S4, S1<S3, S2<S3, S1+S2<1.5S3, or S4≤S1, S4<S3, S2<S3, S4+S2<1.5S3.

[0042] The maximum outer diameter of the moving iron core 201 is defined as D. In this solution, the gap Q3 can be set to 0.01D. When the gap Q3 is small enough, the noise when the moving iron core 201 and the stationary iron core 101 are attracted can be reduced.

[0043] In this embodiment, the flow-delaying member 6 further includes a fixing portion 62, which extends radially outward from the lower end of the flow-delaying member 61, and is in an outward flange shape relative to the flow-delaying member 61, and the upper end of the fixing portion 62 abuts against the lower end of the cylinder 102. The connecting member 103 includes a step hole 1032 with a step surface facing upward, the lower end of the fixing portion 62 abuts against the step surface 1034 of the step hole 1032, the lower end of the cylinder 102 is located in the step hole 1032, and the outer wall of the cylinder 102 is tightly matched with the step wall 1033 of the step hole 1032. In this embodiment, the fixing portion 62 of the flow-delaying member 6 is located on the step surface 1034 of the connecting member 103, and the upper end of the fixing portion 62 of the flow-delaying member 6 is pressed by the cylinder 102, that is, the axial direction of the flow-delaying member 6 is limited by the connecting member 103 and the cylinder 102, and the limiting of the flow-delaying member 6 does not need to be welded or threaded, and the limiting method is simple, and no other processes need to be added. Of course, it is understandable that the flow-reducing member 6 and the cylinder 102 can also be welded and fixed without affecting the functions of the gaps, but this is not the preferred method of this solution.

[0044] In addition, if Figure 4A As shown, the upper end of the second spring 203 abuts against the moving iron core 201, and the lower end of the second spring 203 abuts against the valve core 204. When the control valve is in a fully open state, there is a second axial distance b between the upper end of the valve core 204 and the upper end of the large diameter hole 20111 of the moving iron core 20 (i.e., the wall of the large diameter hole 20111 facing the valve core 204), and there is a first axial distance a between the lower end of the sliding fitting portion 2013 of the moving iron core 201 and the upper end of the slow flow portion 61, and the valve core 204 has a third axial distance c relative to the valve mouth portion 3012. The moving iron core 201 has an abutting surface 2015. It should be noted here that the "distance" mentioned in this article is the distance between the two after the relative movement. Figure 4A The distance between the first contact points in the longitudinal direction of the control valve. In the above distance, a<b+c. Therefore, when the control valve is Figure 4 The fully open position shown is Figure 2In the process of the fully closed state change shown, the moving iron core 201 is separated from the static iron core 101 and moves downward under the action of the first spring 202, and the valve core 204 closes the valve port 3010. In this process, the moving iron core 201 moves downward, and its abutting surface 2015 first abuts against the slow flow portion 61 of the slow flow member 6 to limit the position, thereby preventing the momentum generated by the movement of the moving iron core 201 and the elastic force of the first spring 202 from acting on the valve core 204. Under the action of the second spring 203 and the pressure difference force, the valve core 204 closes the valve port 3010, thereby reducing the impact force between the valve core 204 and the valve port 3012, and improving the service life of the valve core 204. It can be seen that in this process, the slow flow member 6 also plays a role in limiting the moving iron core 102.

[0045] It should be noted that the flow area in this article refers to the minimum flow area of ​​the corresponding part.

[0046] The above description is only an example of a specific embodiment of the present invention and should not be construed as a limitation on the protection points of the present invention. It should be pointed out that a person skilled in the art can make several improvements and modifications without departing from the principles of the present invention, and these improvements and modifications should also be regarded as within the protection scope of the present invention.

Claims

1. A control valve, comprising a valve body component and an actuating component, wherein the valve body component comprises a static iron core and a cylinder, wherein the static iron core is fixedly connected to the cylinder, and the actuating component comprises a moving iron core and a valve core, wherein: The moving iron core comprises a sliding fitting portion and a reduced diameter portion, the outer diameter of the sliding fitting portion is larger than the outer diameter of the reduced diameter portion, and the outer wall of the sliding fitting portion is in a sliding fit with the inner wall of the cylinder; The control valve further comprises a flow-slowing member, the flow-slowing member is located below the sliding fitting portion, the flow-slowing member comprises a flow-slowing portion, the flow-slowing portion is annular, the flow-slowing portion is at least partially located between the outer wall of the reduced diameter portion and the inner wall of the cylinder, the flow-slowing portion comprises a connecting hole, the outer wall of the flow-slowing portion is in clearance with the inner wall of the cylinder, and the inner wall of the flow-slowing portion is in clearance with the outer wall of the reduced diameter portion. The control valve includes a valve port and a fluid outlet, wherein the gap between the inner wall of the slow-flow portion and the outer wall of the reduced-diameter portion is defined as Q2, the gap between the inner wall of the cylinder and the outer wall of the sliding fitting portion is defined as Q3, and the gap between the outer wall of the slow-flow portion and the inner wall of the cylinder is defined as Q4. The gap Q4 connects the gap Q3 and the connecting hole. When the valve core opens the valve port, the connecting hole, the valve port and the fluid outlet are connected; and the gap Q4, the gap Q2, the valve port and the fluid outlet are connected.

2. The control valve according to claim 1, characterized in that: The flow area of ​​the gap Q2 is defined as S2, the flow area of ​​the gap Q3 is defined as S3, and the flow area of ​​the gap Q4 is defined as S4, satisfying: S1≤S4, S1<S3, S2<S3, S1+S2<1.5S3, or S4≤S1, S4<S3, S2<S3, S4+S2<1.5S3.

3. The control valve according to claim 1, characterized in that: The flow-slowing member further includes a fixing portion, which extends radially outward from the lower end of the flow-slowing member, the lower end of the cylinder abuts against the fixing portion, and the lower end of the fixing portion abuts against the valve body component.

4. The control valve according to claim 3, characterized in that: The valve body component includes a valve body and a connecting piece, the connecting piece is fixedly connected to the cylinder, the connecting piece includes a step hole with a step surface facing the flow slowing piece, the lower end of the cylinder is located in the step hole, and the fixing part abuts against the step surface of the step hole.

5. The control valve according to any one of claims 1 to 4, characterized in that: The control valve comprises a valve port portion, the valve port portion comprises the valve port, the movable iron core comprises a stepped hole, the stepped hole comprises a large diameter hole and a small diameter hole, the actuating member comprises a first spring and a second spring, the upper end of the first spring abuts against the static iron core, the lower end of the first spring abuts against the movable iron core, the second spring is located in the stepped hole, the upper end of the second spring abuts against the movable iron core, and the lower end of the second spring abuts against the valve core; When the control valve is in the fully open state, it is defined that there is a first axial distance a between the lower end of the sliding fitting portion and the upper end of the slow flow portion, there is a second axial distance b between the upper end of the valve core and the upper end of the large diameter hole, and there is a third axial distance c between the valve core and the valve mouth portion, then: a<b+c.

6. The control valve according to claim 5, characterized in that The connecting piece includes a lower threaded portion, the valve body includes a first threaded portion and an inner protrusion, the inner protrusion has an insertion hole, the control valve also includes a valve seat, the valve seat includes an insertion portion, the lower threaded portion is threadedly connected to the first threaded portion, the insertion portion is threadedly connected to the inner protrusion, and the valve seat has an axial through hole, which connects the valve port and the fluid outlet.

7. The control valve according to claim 5, characterized in that: The actuating component includes a stopper, which is riveted and fixed to the lower end of the moving iron core. The valve core includes a large diameter section and a small diameter section. The outer diameter of the large diameter section is greater than the outer diameter of the small diameter section. The large diameter section is located in the small diameter hole, and the small diameter section can abut against the valve mouth.

8. The control valve according to claim 6, characterized in that: The control valve also includes a cylindrical filter element, which is located in the valve cavity of the control valve and is sleeved on the outer periphery of the valve seat. The valve body includes a cylindrical portion, which includes the first threaded portion, and the cylindrical portion also includes a non-threaded portion. An annular groove is included between the non-threaded portion and the inner protrusion. The upper end of the filter element abuts against the connecting member, and the lower end of the filter element abuts against the bottom wall of the annular groove. The control valve includes a fluid inlet, and the filter element can filter the fluid entering from the fluid inlet.

9. The control valve according to claim 5, characterized in that: The moving iron core comprises a contact surface, the contact surface is located at the lower end of the sliding fitting portion, and the contact surface can contact and limit the position of the slow flow portion.

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