A control valve

Abstract

This invention discloses a control valve, including a valve body component and a first piston component. The valve body component includes a valve body and a valve seat. The valve body includes a first main valve port, a first connecting portion, and a corner portion. The valve seat is located within the inner cavity of the valve body and includes a second main valve port, a second connecting portion, and a conical portion. The second connecting portion is connected to the first connecting portion. In the longitudinal direction of the control valve, the conical portion extends towards the first main valve port relative to the second connecting portion. The conical portion includes a sealing portion that abuts against the corner portion. In the control valve provided in this application, the valve seat is installed within the inner cavity of the valve body. The conical portion of the valve seat includes a sealing portion. By pressing the corner portion of the valve body with the sealing portion, the sealing portion abuts against the corner portion, thereby forming a sealing pair, improving the sealing effect between the valve seat and the valve body, and thus improving the sealing reliability of the control valve.

Description

Technical Field

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

[0002] Figure 1 This diagram illustrates a cross-sectional view of a control valve, which includes a main valve body 1' and a spacer 3'. The spacer 3' is threadedly connected to the inner wall of the main valve body 1'. The main valve body 1' includes a stepped portion 11' with the stepped surface facing upwards. The spacer 3' includes a sealing surface. The axial clamping force of the thread ensures that the sealing surface of the spacer 3' abuts against the stepped surface, thereby achieving a seal at the connection between the spacer 3' and the main valve body 1'. However, due to limitations in machining precision, the sealing surface of the spacer 3' and the stepped surface of the main valve body 1' cannot guarantee a perfect seal, thus affecting the sealing reliability of the control valve. Summary of the Invention

[0003] This invention provides a control valve, including a valve body component and a first piston component. The valve body component includes a valve body and a valve seat. The valve body includes a first main valve port, a first connecting portion, and a corner portion. In the transverse direction of the control valve, the corner portion is closer to the center of the valve body than the first connecting portion. The valve seat is located in the inner cavity of the valve body. The valve seat includes a second main valve port, a second connecting portion, and a conical portion. The second connecting portion is connected to the first connecting portion. In the longitudinal direction of the control valve, the conical portion extends toward the first main valve port relative to the second connecting portion. The conical portion includes a sealing portion that abuts against the corner portion. In the longitudinal direction of the control valve, the second main valve port is closer to the first main valve port than the sealing portion. The first piston component can abut against either the first main valve port or the second main valve port.

[0004] The control valve provided in this application has a valve seat installed in the inner cavity of the valve body. The conical part of the valve seat includes a sealing part, which abuts against the corner part to form a sealing pair, thereby improving the sealing effect between the valve seat and the valve body and thus improving the sealing reliability of the control valve. Attached Figure Description

[0005] Figure 1 A cross-sectional schematic diagram of a control valve is provided by related technologies;

[0006] Figure 2 : A cross-sectional schematic diagram of an embodiment of the control valve of the present invention;

[0007] Figure 3 : Figure 2 A schematic diagram at point A in the middle;

[0008] Figure 4 : Figure 2A schematic diagram at point B in the middle;

[0009] Figure 5 : Figure 2 A cross-sectional view of the connection between the valve body and the connecting pipe;

[0010] Figure 6 : Figure 5 A schematic diagram at point C in the middle;

[0011] Figure 7 : Figure 5 A schematic diagram at point D in the middle;

[0012] Figure 8 : Figure 2 A cross-sectional view of the valve seat;

[0013] Figure 9 : Figure 2 A cross-sectional schematic diagram of the first piston component;

[0014] Figure 10 : Figure 2 A cross-sectional view of the control valve in the power-off state;

[0015] Figure 11 : Figure 2 A cross-sectional view of the control valve in the energized state. Detailed Implementation

[0016] To enable those skilled in the art to better understand the technical solutions of this application, the embodiments of this application will be further described below in conjunction with the accompanying drawings. Obviously, the accompanying drawings described below are merely some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort. The directional terms such as "up" and "down" used herein are... Figure 2 The positions of the components shown are defined only for clarity and convenience in expressing the technical solution. It should be understood that the directional terms used herein should not limit the scope of protection claimed in this application.

[0017] Figure 2 This is a cross-sectional schematic diagram of one embodiment of the control valve of the present invention; Figure 3 for Figure 2 A schematic diagram at point A in the middle; Figure 4 for Figure 2 A schematic diagram at point B in the middle; Figure 5 for Figure 2 A cross-sectional view of the connection between the valve body and the connecting pipe; Figure 6 for Figure 5 A schematic diagram at point C in the middle; Figure 7 for Figure 5 A schematic diagram at point D in the middle; Figure 8 for Figure 2A cross-sectional view of the valve seat; Figure 9 for Figure 2 A cross-sectional schematic diagram of the first piston component; Figure 10 for Figure 2 A cross-sectional view of the control valve in the power-off state; Figure 11 for Figure 2 A cross-sectional view of the control valve in the energized state.

[0018] In this embodiment, the transverse direction of the control valve is the axial direction of the inlet pipe 41 described below, and the longitudinal direction of the control valve is the axial direction of the first outlet pipe 42 described below.

[0019] As shown in the figure, the control valve in this embodiment is described using a pilot-operated three-way solenoid valve as an example. This control valve can be used in air conditioners, compressors, refrigerators, and water heaters to control the flow of gas or liquid.

[0020] The control valve in this embodiment includes a valve body component 1, a piston assembly 2, a pilot valve component 3, and a connecting pipe component 4. The valve body component 1 includes a valve body 11, a valve seat 12, and a valve cover 13. The valve seat 12 is located in the inner cavity of the valve body 11 and is connected to the inner wall of the valve body 11. In the longitudinal direction of the control valve, the valve cover 13 is located above the valve body 11, and the valve body 11 and the valve cover 13 are welded and fixed. The valve body 11 includes an inlet end 1101, a first outlet end 1102, a second outlet end 1103, and a suction port end 1104. The suction port end 1104 can be connected to the suction end of the compressor (not shown in the figure). The connecting pipe component 4 includes an inlet connecting pipe 41, a first outlet connecting pipe 42, and a second outlet connecting pipe 43. One side of the inlet connecting pipe 41 is welded and fixed to the inlet end 1101, and the other side of the inlet connecting pipe 41 can be connected to the discharge end of the compressor (not shown in the figure). One side of the first outlet connecting pipe 42 is welded and fixed to the first outlet end 1102, and the other side of the first outlet connecting pipe 42 can be connected to the condenser (not shown in the figure). One side of the second outlet connecting pipe 43 is welded and fixed to the second outlet end 1103, and the other side of the second outlet connecting pipe 43 can be connected to the evaporator (not shown in the figure).

[0021] Valve body component 1 includes pilot flow path 101 and connecting flow path 102. Valve cover 13 includes pilot cavity 131. Pilot flow path 101 connects inlet end 1101 and pilot cavity 131. Connecting flow path 102 connects pilot cavity 131 and main valve cavity 100 of valve body component 1. Pilot valve component 3 includes pilot valve core 31 located in pilot cavity 131. Pilot valve component 3 controls pilot valve core 31 to connect or disconnect pilot flow path 101 and connecting flow path 102.

[0022] The pilot valve component 3 includes a sleeve 32 and a core iron component. The core iron component is located inside the sleeve 42. The core iron component includes the aforementioned pilot valve core 31, core iron 33, end cap 34, connecting spring 35, and ejector pin 36. The pilot valve core 31 is preferably made of steel ball. The core iron 33 can slide inside the sleeve 32. The end cap 34 is fixedly connected to the sleeve 32. The core iron 33 has a hole. A part of the ejector pin 36 is located in the hole. The lower end of the ejector pin 36 can abut against the pilot valve core 31. One end of the connecting spring 35 abuts against the ejector pin 36, and the other end of the connecting spring 35 abuts against the end cap 34.

[0023] Piston assembly 2 includes a first piston component 21, a connecting rod 22, and a second piston component 23. In the longitudinal direction of the control valve, the first piston component 21 is at least partially located below the valve seat 12, and the second piston component 23 is at least partially located above the valve seat 12. The connecting rod 22 includes a first connecting end 221, an intermediate section 222, and a second connecting end 223. The diameter of the intermediate section 222 is larger than both the diameter of the first connecting end 221 and the diameter of the second connecting end 223. Valve seat 12... The valve includes a flow channel hole 120, with a portion of the intermediate section 222 located in the flow channel hole 120. The first connecting end 221 is connected to the first piston component 21, and the second connecting end 223 is connected to the second piston component 23. A piston spring 24 is included between the second piston component 23 and the valve cover 13. In the longitudinal direction of the control valve, one end of the piston spring 24 abuts against the valve cover 13, and the other end of the piston spring 24 abuts against the second piston component 23. The second outlet end 1103 is located between the valve cover 13 and the second main valve port 121 described below.

[0024] In this embodiment, the control valve body 11 includes a first main valve port 111, a first connecting portion 112, and a first corner portion 113. In the transverse direction of the control valve, the first corner portion 113 is closer to the center of the valve body 11 than the first connecting portion 112. The valve seat 12 includes a second main valve port 121, a second connecting portion 122, and a conical portion 124. The second connecting portion 122 is connected to the first connecting portion 112. In the longitudinal direction of the control valve, the conical portion 124 extends toward the first main valve port 111 relative to the second connecting portion 122. The conical portion 124 includes a sealing portion 123, which abuts against the first corner portion 113. In the longitudinal direction of the control valve, the second main valve port 121 is closer to the first main valve port 111 than the sealing portion 123. The first piston component 21 can abut against either the first main valve port 111 or the second main valve port 121. In this example control valve, the valve seat 12 is located inside the valve body 11. The conical part 124 of the valve seat 12 includes a sealing part 123. The sealing part 123 presses against the corner 113 of the valve body 11, causing the sealing part 123 to abut against the corner 113, thereby forming a sealing pair, ensuring the sealing effect between the valve seat 12 and the valve body 11, thereby improving the sealing reliability of the control valve.

[0025] In this embodiment, such as Figure 11 As shown, the main valve chamber 100 includes an upper valve chamber 1001 and a lower valve chamber 1002. The upper valve chamber 1001 is located above the second main valve port 121, and the second outlet end 1103 is connected to the upper valve chamber 1001. The lower valve chamber 1002 is located below the second main valve port 121, and the first outlet end 1102 is connected to the lower valve chamber 1002.

[0026] The valve body 11 includes an internal thread portion 115, which serves as a first connecting portion 112. The valve seat 12 includes an external thread portion 125, which serves as a second connecting portion 122. It should be noted that, compared to the surface sealing structure in the prior art, in this embodiment, the valve seat 12 and valve body 11 achieve sealing through the abutment of the sealing portion 123 and the corner portion 113. That is, during the tightening of the valve seat 12 threads, the axial clamping force causes the sealing portion 123 to press against the corner portion 113. Therefore, when the first piston component 21 abuts against the second main valve port 121, the sealing effect of the upper valve chamber 1001 can be effectively guaranteed, reducing or preventing fluid from flowing from the lower valve chamber 1002 to the upper valve chamber 1001.

[0027] Understandably, the surface sealing structure in the background technology is affected by machining precision. On the one hand, the face-to-face sealing requires a high degree of perpendicularity between the sealing surface and the thread axis. On the other hand, the two planes cannot actually be perfectly parallel, thus failing to guarantee a perfect fit. This can cause scratches to form on the initially fitted surface as the spacer tightens, affecting the sealing effect of the control valve. Furthermore, the sealing performance between the spacer and the main valve body depends entirely on the tightening force of the threads. Once the threads loosen, the seal fails, also affecting the sealing effect of the control valve.

[0028] In this embodiment, it should also be noted that the valve seat 12 and the valve body 11 are sealed by the sealing portion 123 and the corner portion 113 abutting against each other, thus reducing material consumption. It is understood that, compared to the surface sealing structure in the prior art, surface seals typically have a wider sealing surface to provide a larger contact area and higher sealing force. Therefore, the diameter, pitch, or other related dimensions of the external thread of the spacer will increase accordingly, thereby increasing the amount of material used.

[0029] like Figure 5 As shown, specifically, the maximum inner diameter of the first connecting portion 112 is defined as D1, and the minimum inner diameter of the first corner portion 113 is defined as D2, satisfying the condition D2 < D1 < 1.15D2. In this embodiment, D1 is preferably 1.1D2. Thus, while ensuring that the strength of the valve seat 12 meets the requirements and that the valve seat 12 is easy to process and manufacture, the volume of the valve seat 12 can be reduced, the amount of material used in the valve seat 12 can be reduced, thereby reducing the manufacturing cost of the control valve.

[0030] like Figure 8 As shown, in this embodiment, the valve seat 12 includes the aforementioned flow channel hole 120. Defined as having a maximum outer diameter of D3 and a minimum inner diameter of D4 for the flow channel hole 120, the following condition is satisfied: 1.3D4 ≤ D3 ≤ 1.5D4. In this embodiment, preferably, D3 is 1.4D4. Therefore, the thread specification of the valve seat 12 can be reduced accordingly, decreasing the material usage of the valve seat 12 and thus reducing the manufacturing cost of the control valve.

[0031] like Figure 3 and Figure 6 As shown, the valve body 11 includes a stepped portion 114, which includes a transverse portion 1142 and a longitudinal portion 1143. The transverse portion 1142 and the longitudinal portion 1143 intersect each other, and the intersection of the transverse portion 1142 and the longitudinal portion 1143 includes the aforementioned corner portion 113. The included angle on the longitudinal section of the transverse portion 1142 and the longitudinal portion 1143 is 80-100 degrees, preferably 90 degrees. This facilitates the processing and forming of the valve body 11.

[0032] like Figure 3 As shown, the conical section 124 includes a first conical portion 1241 and a second conical portion 1242. The outer diameter of the first conical portion 1241 is larger than the outer diameter of the second conical portion 1242. In the longitudinal direction of the control valve, the first conical portion 1241 and the second conical portion 1242 are transitionally connected, and the first conical portion 1241 is located above the second conical portion 1242. The first conical portion 1241 includes a sealing portion 123. The valve seat 12 includes an end portion 126 near the first main valve port 111. The end portion 126 is connected to the small-diameter end portion 12421 of the second conical portion 1242. At least a portion of the end portion 126 serves as the second main valve port 121. The first piston component 21 includes a first seal 212, which is capable of abutting against the second main valve port 121. It should be noted that the thickness of the second main valve port 121 in the lateral direction of the control valve will affect the sealing effect when the first seal 212 blocks the second main valve port 121. Thus, the smaller the thickness of the second main valve port 121 in the lateral direction of the control valve, the smaller the contact area between the second main valve port 121 and the first seal 212, and the greater the sealing specific pressure, which helps to ensure the sealing effect of the control valve.

[0033] like Figure 9As shown, the first piston component 21 includes a first plug body 211 and a first seal 212. The first seal 212 is at least partially located above the first plug body 211 and is a sealing ring. When the outer conical portion 2111 of the first plug body 211 abuts against the first main valve port 111, the first plug body 211 blocks the first main valve port 111, allowing the inlet end 1101 to communicate with the second outlet end 1103. When the first seal 212 blocks the second main valve port 121, the inlet end 1101 communicates with the first outlet end 1102.

[0034] The first piston component 21 further includes a cover 213. The first piston 211 includes a second groove 2112, a first groove 2113, and a first hole 2114. The cover 213 and the first seal 212 are at least partially located in the second groove 2112. The cover 213 includes a second hole 2131. A portion of the first connecting end 221 of the connecting rod 22 is located in the second hole 2131. Another portion of the first connecting end 221 is located in the first hole 2114. The portion of the first connecting end 221 extending out of the first hole 2114 is connected to the connecting component 23. When the first piston component 21 is connected and fixed to the connecting rod 22, the first connecting end 221 of the connecting rod 22 passes through the first hole 2114 of the first plug body 211 and the second hole 2131 of the cover body 213. The part of the first connecting end 221 that extends out of the first hole 2114 is connected to the connecting component 23. Since the diameter of the middle section 222 is larger than that of the first connecting end 221, the top surface of the cover body 213 can abut against the lower end surface of the middle section 222. The nut is connected to the threaded part of the first piston component 21 by means of the nut. The upper end surface of the nut abuts against the top of the groove of the first groove 2113 to achieve the connection and fixation of the first piston component 21 and the connecting rod 22.

[0035] like Figure 2 , Figure 4 , Figure 7 and Figure 9 As shown, in this embodiment, the first plug 211 includes an outer conical portion 2111, and the included angle on the longitudinal section of the outer conical portion 2111 is defined as θ1. The valve body 11 includes an inner conical portion 1161 and a bore wall portion 1162. The inner conical portion 1161 includes a first main valve port portion 111, or the connection between the inner conical portion 1161 and the bore wall portion 1162 includes the first main valve port portion 111. The first plug 211 can abut against the first main valve port portion 111. The included angle on the longitudinal section of the inner conical portion 1161 is defined as θ2, which satisfies that θ2 > θ1. Based on this, good sealing performance between the first piston component 21 and the valve body 1 can be guaranteed when the first plug 211 abuts against the first main valve port portion 111, reducing or avoiding the possibility of medium leakage from the first outlet pipe 42.

[0036] Preferably, the difference between θ2 and θ1 is 2-10 degrees. This setting makes it less likely for indentations to form on the outer conical surface 2111, ensuring good sealing performance between the first piston component 21 and the valve body 1.

[0037] Specifically, the first piston component 21 includes a first plug body 211, which includes a first groove 2113 and a first hole 2114. The groove opening of the first groove 2113 faces away from the valve seat 12. A portion of the connecting rod 22 is located in the first hole 2114, and another portion of the connecting rod 22 is located in the first groove 2113. The groove width of the first groove 2113 is greater than the width of the connecting component 23. At least a portion of the connecting component 23 is located in the first groove 2113. The connecting component 23 is connected to the connecting rod 22, and the connecting component 23 abuts against the top of the groove of the first groove 2113. The connecting component 23 includes a nut and a sealing ring (not shown in the figure). The nut is threaded to the first connecting end 221 of the connecting rod 22. The sealing ring surrounds the first connecting end 221 and abuts against the upper surface of the nut between the top of the groove of the first groove 2113 to achieve a seal. Based on this, the following beneficial effects are achieved:

[0038] On the one hand, by setting the first groove 2113, the excess part of the first plug 211 is removed, the amount of material used is reduced, the manufacturing cost of the first piston component 21 is reduced, and thus the manufacturing cost of the control valve is reduced.

[0039] On the other hand, by setting the first groove 2113, the connecting member 23 is at least partially located in the first groove 2113, so that the longitudinal length of the piston assembly 2 can be shortened, and the flow performance of the control valve can be ensured when the inlet end 1101 is connected to the first outlet end 1102.

[0040] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0041] The above examples illustrate the principles and implementation methods of the present invention. These embodiments are merely illustrative and are intended to aid in understanding the invention. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the present invention.

Claims

1. A control valve, characterized in that, The control valve includes a valve body component (1) and a first piston component (21). The valve body component (1) includes a valve body (11) and a valve seat (12). The valve body (11) includes a first main valve port (111), a first connecting portion (112), and a corner portion (113). In the transverse direction of the control valve, the corner portion (113) is closer to the center of the valve body (11) than the first connecting portion (112). The valve seat (12) is located in the inner cavity of the valve body (11). The valve seat (12) includes a second main valve port (121), a second connecting portion (122), and a conical portion (124). The second connecting portion (121)... 2) Connected to the first connecting part (112), in the longitudinal direction of the control valve, the conical part (124) extends toward the first main valve port (111) relative to the second connecting part (122), the conical part (124) includes a sealing part (123), the sealing part (123) abuts against the corner part (113); in the longitudinal direction of the control valve, the second main valve port (121) is closer to the first main valve port (111) than the sealing part (123), and the first piston component (21) can abut against the first main valve port (111) or the second main valve port (121).

2. The control valve according to claim 1, characterized in that, Define the maximum inner diameter of the first connecting part (112) as D1 and the minimum inner diameter of the corner part (113) as D2, then satisfy D2<D1≤1.15D2.

3. The control valve according to claim 1 or 2, characterized in that, The valve seat (12) includes a flow channel hole (120). The maximum outer diameter of the valve seat (12) is defined as D3, and the minimum inner diameter of the flow channel hole (120) is defined as D4. Then, 1.3D4≤D3≤1.5D4 is satisfied.

4. The control valve according to any one of claims 1-3, characterized in that, The conical portion (124) includes a first conical portion (1241) and a second conical portion (1242). The outer diameter of the first conical portion (1241) is larger than the outer diameter of the second conical portion (1242). The first conical portion (1241) is located above the second conical portion (1242). The first conical portion (1241) includes the sealing portion (123). The valve seat (12) includes an end portion (126) near the first main valve port (111). The end portion (126) is connected to the small-diameter end portion (12421) of the second conical portion (1242). At least a portion of the end portion (126) serves as the second main valve port (121).

5. The control valve according to any one of claims 1-4, characterized in that, The first piston component (21) includes a first plug body (211), the first plug body (211) includes an outer conical part (2111), the included angle on the longitudinal section of the outer conical part (2111) is defined as θ1, the valve body (11) includes an inner conical part (1161) and a bore wall part (1162), the inner conical part (1161) includes the first main valve port part (111), or the connection between the inner conical part (1161) and the bore wall part (1162) includes the first main valve port part (111), the first plug body (211) can abut against the first main valve port part (111), the included angle on the longitudinal section of the inner conical part (1161) is defined as θ2, then θ2 > θ1 is satisfied.

6. The control valve according to claim 5, characterized in that, The difference between θ2 and θ1 is 2-10 degrees.

7. The control valve according to any one of claims 1-6, characterized in that, The control valve includes a piston assembly (2), which includes a first piston component (21), a connecting rod (22), and a connecting component (23). The first piston component (21) includes a first plug (211), which includes a first groove (2113) and a first hole (2114). The groove opening of the first groove (2113) is disposed away from the valve seat (12). A portion of the connecting rod (22) is located in the first hole (2114), and another portion of the connecting rod (22) is located in the first groove (2113). The width of the first groove (2113) is greater than the width of the connecting member (23). At least a portion of the connecting member (23) is located in the first groove (2113). The connecting member (23) is connected to the connecting rod (22). The connecting member (23) abuts against the top of the first groove (2113).

8. The control valve according to any one of claims 1-7, characterized in that, The valve body (11) includes an internal thread portion (115), which serves as the first connecting portion (112), and the valve seat (12) includes an external thread portion (125), which serves as the second connecting portion (122). The valve body (11) includes a stepped portion (114), which includes a transverse facet (1142) and a longitudinal facet (1143). The transverse facet (1142) and the longitudinal facet (1143) intersect each other. The intersection of the transverse facet (1142) and the longitudinal facet (1143) includes the corner portion (113). The included angle between the transverse facet (1142) and the longitudinal facet (1143) on the longitudinal section is 80-100 degrees.

9. The control valve according to any one of claims 1-8, characterized in that, The control valve includes a piston assembly (2), which includes a first piston component (21), a connecting rod (22), and a second piston component (23). In the longitudinal direction of the control valve, the first piston component (21) is at least partially located below the valve seat (12), and the second piston component (23) is at least partially located above the valve seat (12). The connecting rod (22) includes a first connecting end (221), an intermediate section (222), and a second connecting end (223). The valve seat (12) includes a flow channel hole (120), a portion of the intermediate section (222) located within the flow channel hole (120). The first connecting end (221) is connected to the... The first piston component (21) is connected, and in the longitudinal direction of the control valve, the first outlet end (1102) is located below the first main valve port (111). The second connecting end (223) is connected to the second piston component (23). A piston spring (24) is included between the second piston component (23) and the valve body component (1). In the longitudinal direction of the control valve, one end of the piston spring (24) abuts against the valve body component (1), and the other end of the piston spring (24) abuts against the second piston component (23). The second outlet end (1103) is located between the second piston component (23) and the second main valve port (121).

10. The control valve according to any one of claims 1-9, characterized in that, The valve body component (1) includes a pilot flow path (101), a connecting flow path (102), and a pilot cavity (131). The valve body (11) includes an inlet end (1101), a first outlet end (1102), and a second outlet end (1103). The pilot flow path (101) connects the inlet end (1101) and the pilot cavity (131). The connecting flow path (102) connects the pilot cavity (131) and the main valve cavity (100) of the valve body component (1). The control valve also includes a pilot valve component (3). The pilot valve component (3) includes a pilot valve core (31) located in the pilot cavity (131). The pilot valve core (31) enables the pilot flow path (101) and the connecting flow path (102) to be connected or disconnected.

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