A sequential pressure reducing valve

Abstract

This application discloses a sequential pressure reducing valve, including a valve body and a valve core assembly. One end of the valve body is an open end, and the other end is a closed end. The valve core assembly includes a valve core, a spring, and a spring seat arranged sequentially along the axial direction. The valve core is located at the closed end of the valve body, away from the spring seat. The valve core has a through hole through which a screw passes, forming a flow gap between the screw and the through hole for the medium to pass through. The screw passes through the valve core and the spring and is threadedly connected to the spring seat. The inner wall of the valve body has an annular limiting surface, and the spring is located between the annular limiting surface and the spring seat. The peripheral wall of the valve body has an inlet and an outlet, with the inlet located away from the open end of the valve body relative to the outlet. The middle part of the outer peripheral wall of the valve core is recessed to form an annular groove, which connects the inlet and the outlet. A through hole is provided at the part of the valve core corresponding to the annular groove. When the valve core is in the initial state, the inlet is connected to the annular groove, and the outer peripheral wall of the valve core closes the outlet. This application simultaneously has the functions of a sequential valve and a pressure reducing valve.

Description

Technical Field

[0001] This application relates to the field of valves, and more particularly to a sequential pressure reducing valve. Background Technology

[0002] Both sequence valves and pressure reducing valves are pressure control valves. A sequence valve opens when the pressure of the medium in the system reaches a certain value. Sequence valves are typically used in combination with other valves (such as check valves and directional valves) to control the flow direction of the medium in a system. After the sequence valve opens, the overall pressure of the medium entering and exiting the sequence valve remains constant. A pressure reducing valve is a valve that remains open during use. It is used to reduce the pressure of the medium entering the system.

[0003] Sometimes, a media system needs to install both a sequence valve and a pressure reducing valve. However, the space available for installing valves in the media system is limited, making it difficult and inconvenient to install both at the same time. Summary of the Invention

[0004] To address the problem that it is difficult for a media system to simultaneously function as a sequence valve and a pressure reducing valve when space is limited for installing valves, this application provides a sequence pressure reducing valve.

[0005] The sequential pressure reducing valve provided in this application adopts the following technical solution:

[0006] A sequential pressure reducing valve includes a valve body and a valve core assembly. One end of the valve body is an open end, and the other end is a closed end. The valve core assembly includes a valve core, a spring, and a spring seat arranged sequentially along the axial direction. The valve core is located away from the closed end of the valve body relative to the spring seat. The valve core has a through hole through which a screw passes. A flow gap is formed between the screw and the through hole for the medium to pass through. The screw passes through the valve core and the spring and is threadedly connected to the spring seat. An annular limiting surface is provided on the inner wall of the valve body. Facing the closed end of the valve body, the spring is located between the annular limiting surface and the spring seat, and the spring is used to force the spring seat away from the open end of the valve body; the peripheral wall of the valve body is provided with an inlet and an outlet, and the inlet is away from the open end of the valve body relative to the outlet; the middle part of the outer peripheral wall of the valve core is recessed to form an annular groove, and the annular groove is used to connect the inlet and the outlet, and the valve core is provided with a through hole corresponding to the annular groove; when the valve core is in the initial state, the inlet is connected to the annular groove, and the outer peripheral wall of the valve core closes the outlet.

[0007] By adopting the above technical solution, when the sequential pressure reducing valve is in use, the open end of the valve body is inserted into the medium container, and the inlet on the valve body is connected to the medium container. When the fluid medium enters the inlet of the valve body, it flows through the through hole and the flow gap to the end of the valve core near the closed end of the valve body. The port of the valve core away from the closed end of the valve body is blocked by the screw body, preventing the medium from flowing to the end of the valve core away from the closed end of the valve body. After the medium enters the inside of the valve body, the medium exerts pressure on the end face of the valve core near the closed end of the valve body, causing the medium to push the valve core to move away from the closed end of the valve body until the annular groove of the valve core is connected to the outlet on the valve body. Then the medium in the valve body flows out from the outlet, causing the sequential pressure reducing valve to open. During this process, the valve core drives the spring seat away from the closed end of the valve body through the screw, causing the spring to be deformed by compression. The amount of deformation of the spring is required to move the valve core to the position where the annular groove is connected to the outlet. That is, the medium system needs to reach a certain pressure value to open the sequential pressure reducing valve.

[0008] As the fluid medium pushes the valve core to move, the medium entering the flow gap simultaneously exerts a thrust on the screw head, forcing a gap to form between the screw head and the valve core port. This causes some of the fluid medium to leak outward from the open end of the valve body, reducing the medium pressure at the valve core end near the closed end of the valve body. The spring force is greater than the thrust of the medium on the valve core, causing the spring to drive the spring seat, screw, and valve core back. Because some of the medium leaks through the open end of the valve body after entering, the medium pressure output from the outlet decreases, thus giving the sequential pressure reducing valve a pressure reducing function. The sequential pressure reducing valve combines the functions of a conventional sequential valve and a pressure reducing valve.

[0009] Optionally, the screw head has an outward convex arc surface that tapers towards the screw body.

[0010] By adopting the above technical solution, the screw head tapers towards the body from the convex arc, making the contact area between the screw head and the valve core port nearly linear. This reduces the resistance to fluid leakage from the flow gap, which helps ensure the pressure-reducing function of the sequential pressure-reducing valve.

[0011] Optionally, the screw body near the head tapers towards the head.

[0012] By adopting the above technical solution, the screw body tapers towards the screw head, increasing the gap between the end of the screw body near the screw head and the inner wall of the through hole. This helps to increase the thrust of the medium on the screw head, making it easier for the medium to push the screw head.

[0013] Optionally, a limiting sleeve is provided inside the valve body, the limiting sleeve is located between the spring and the annular limiting surface, and the limiting sleeve is sleeved and connected to the screw; when the valve core is in the initial state, the end of the valve core near the closed end of the valve body abuts against the limiting sleeve.

[0014] By adopting the above technical solution, the valve core is installed by screws, and the screws are threadedly connected to the spring seat. As the screws are tightened, the valve core and the spring seat gradually move closer to each other. During this process, the screws drive the valve core to gradually move closer to the spring seat. When the valve core presses against the limit sleeve, the resistance of the screw tightening increases, so that the operator of the pressure reducing valve can judge whether the valve core is installed in place based on the rotational resistance of the screws.

[0015] Optionally, the limiting sleeve has a limiting boss at one end near the spring, and the limiting boss is used to position the spring.

[0016] By adopting the above technical solution, the limiting boss of the limiting sleeve can provide radial positioning for the spring, which helps to reduce the amount of flexural deformation during the spring's extension and contraction, and improves the stability of the valve core assembly's motion state.

[0017] Optionally, the spring seat includes a main body section, a shoulder, and a guide section arranged sequentially along the axial direction. The main body section is close to the screw relative to the guide section. The main body section is provided with a threaded hole adapted to the screw. The spring is sleeved on the main body section. The spring is located between the shoulder and the annular limiting surface. The open end wall of the closed end of the valve body is provided with a guide hole adapted to the guide section.

[0018] By adopting the above technical solution, the shoulder of the spring seat is used for spring abutment, and the main body of the spring seat is used to position the spring, so that the spring and the spring seat maintain a high degree of coaxiality. The guide section of the spring seat is adapted to the guide hole. When the spring is stretched and deformed, the guide section of the spring seat moves within the guide hole, so that the stretching and deformation process of the spring is guided, which helps to reduce the amount of flexural deformation during the stretching and deformation of the spring and improves the stability of the valve core assembly during operation.

[0019] Optionally, the spring seat is provided with a flow guiding channel, which includes a first flow guiding hole and a second flow guiding hole. The first flow guiding hole is opened on the end face of the guide section, and the second flow guiding hole is opened on the outer peripheral wall of the main body section. The first flow guiding hole and the second flow guiding hole are in communication.

[0020] By adopting the above technical solution, when the guide section of the spring seat moves telescopically relative to the guide hole, the size of the space formed between the guide section and the guide hole changes accordingly. During this process, the medium can enter and exit the space formed between the guide section and the guide hole through the guide channel, so that the resistance of the guide section and the guide hole is not easily formed in the process of piston movement.

[0021] Optionally, a number of shims are provided between the shoulder and the spring.

[0022] By adopting the above technical solution and setting a shim between the shoulder and the spring, the pre-compression deformation of the spring in the initial state can be adjusted, thereby adjusting the elastic force of the spring when the same deformation is achieved.

[0023] Optionally, the main body section is coaxially arranged with the shoulder, the guide section is eccentrically arranged with the shoulder, and the outer peripheral surface of the shoulder is adapted to the inner cavity of the valve body.

[0024] By adopting the above technical solution, under the premise that the guide section and the guide hole are adapted, and the shoulder is adapted to the valve body cavity, the eccentric setting between the guide section and the shoulder can limit the relative rotation between the spring seat and the valve body.

[0025] In summary, this application includes at least one of the following beneficial technical effects:

[0026] 1. When using a sequential pressure reducing valve, the medium system needs to reach a certain pressure value for the valve to open. After the medium enters the valve body, some leaks through the valve body's opening, reducing the pressure of the medium output from the outlet, thus enabling the sequential pressure reducing valve to function as a pressure reducing valve. The sequential pressure reducing valve combines the functions of a conventional sequence valve and a pressure reducing valve.

[0027] 2. When the guide section of the spring seat moves telescopically relative to the guide hole, the size of the space formed between the guide section and the guide hole changes accordingly. During this process, the medium can enter and exit the space formed between the guide section and the guide hole through the guide channel, so that the resistance of the guide section and the guide hole is not easily formed as in the piston movement process. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of Example 1 used to illustrate the valve body structure.

[0029] Figure 2 This is a schematic diagram of Embodiment 1 illustrating the structure of the valve core assembly.

[0030] Figure 3 yes Figure 2 A magnified view of a portion of point A in the middle.

[0031] Figure 4 This is a schematic diagram of the structure of Example 2.

[0032] Explanation of reference numerals in the attached figures:

[0033] 1. Valve body; 11. Upper valve sleeve; 111. External thread; 112. Guide hole; 12. Lower valve sleeve; 121. Inlet; 122. Outlet; 123. Annular limiting surface; 13. Closed end; 14. Open end; 2. Valve core assembly; 21. Valve core; 211. Annular groove; 212. Through hole; 213. Through hole; 214. Countersunk hole; 215. Return hole; 22. Spring; 23. Spring seat; 231. Main body section; 232. Shoulder; 233. Guide section; 234. Flow channel; 2341. First flow guide hole; 2342. Second flow guide hole; 24. Screw; 241. Outer convex arc surface; 25. Limiting sleeve; 251. Limiting boss; 26. Gasket; 3. First sealing ring; 4. Second sealing ring; 5. Third sealing ring; 6. Fourth sealing ring; 7. Flow clearance. Detailed Implementation

[0034] The following is in conjunction with the appendix Figure 1-4 This application will be described in further detail.

[0035] Example 1

[0036] This application discloses a sequential pressure reducing valve. (Refer to...) Figure 1 The sequential pressure reducing valve includes a valve body 1 and a valve core assembly 2. The valve body 1 includes an upper valve sleeve 11 and a lower valve sleeve 12 coaxially connected. The end of the upper valve sleeve 11 away from the lower valve sleeve 12 is closed and serves as the closed end 13 of the valve body 1. The end of the upper valve sleeve 11 near the lower valve sleeve 12 is provided with an external thread 111 for connecting the mounting structure of the medium system. The upper valve sleeve 11 is fitted with a first sealing ring 3. The first sealing ring 3 is away from the lower valve sleeve 12 relative to the external thread 111. The first sealing ring 3 is used to seal the gap at the connection between the upper valve sleeve 11 and the mounting structure of the medium system.

[0037] The lower valve sleeve 12 is provided with both ends through it. One end of the lower valve sleeve 12 is inserted into the inner side of the upper valve sleeve 11 by means of a threaded connection. The end of the lower valve sleeve 12 away from the upper valve sleeve 11 serves as the opening end 14 of the valve body 1. The lower valve sleeve 12 is used for the installation structure of the media system. The peripheral wall of the lower valve sleeve 12 is provided with an inlet 121 and an outlet 122. The inlet 121 and the outlet 122 are used to connect different pipeline sections, with the inlet 121 being closer to the upper valve sleeve 11 than the outlet 122. The lower valve sleeve 12 is provided with a second sealing ring 4, a third sealing ring 5 and a fourth sealing ring 6 in sequence along the axial direction. The second sealing ring 4 is used to seal the gap between the upper valve sleeve 11 and the lower valve sleeve 12. The third sealing ring 5 is used to separate the inlet 121 and the outlet 122. The fourth sealing ring 6 is used to separate the outlet 122 and the opening end 14 of the valve body 1.

[0038] Reference Figure 2 and Figure 3The valve core assembly 2 includes a valve core 21, a spring 22 and a spring seat 23 arranged sequentially along the axial direction of the valve body 1. The spring seat 23 and the spring 22 are both located inside the upper valve sleeve 11. The spring 22 is located between the lower valve sleeve 12 and the spring seat 23. The end face of the lower valve sleeve 12 located inside the upper valve sleeve 11 serves as an annular limiting surface 123. The spring 22 is used to force the spring seat 23 away from the lower valve sleeve 12. The valve core 21 is located inside the lower valve sleeve 12. The middle part of the outer peripheral wall of the valve core 21 is recessed to form an annular groove 211. The annular groove 211 is used to connect the inlet 121 and the outlet 122. The valve core 21 has a through hole 212 corresponding to the annular groove 211. A screw 24 is axially inserted through the valve core 21. The valve core 21 has a through hole 213 for the screw 24 to pass through. A flow gap 7 for the medium to pass through is formed between the screw 24 and the through hole 213. The screw 24 passes through the valve core 21 and the spring 22 in sequence and is threadedly connected to the spring seat 23.

[0039] When the valve core 21 is in its initial state, the inlet 121 is connected to the annular groove 211, and the outer peripheral wall of the valve core 21 closes the outlet 122. When the sequential pressure reducing valve is in use, the medium enters from the inlet 121 between the inner wall of the lower valve sleeve 12 and the annular groove 211, and flows through the through hole 212 and the flow gap 7 into the inner cavity of the upper valve sleeve 11. The medium in the inner cavity of the upper valve sleeve 11 exerts a thrust on the valve core 21, causing the valve core 21 to move against the elastic force of the spring 22. The greater the pressure of the medium entering the valve body 1, the greater the thrust on the valve core 21, resulting in a greater movement distance for the valve core 21. When the valve core 21 moves to the position where the annular groove 211 connects to the outlet 122, the medium in the valve body 1 flows out from the outlet 122. This allows the sequential pressure reducing valve to open under a certain pressure.

[0040] It should be noted that the initial state of the valve core 21 referred to in this embodiment is the state when the valve core 21 is not pushed by the medium.

[0041] On the other hand, while the fluid medium pushes the valve core 21 to move, the medium entering the flow gap 7 simultaneously exerts a thrust on the head of the screw 24, forcing a gap to form between the head of the screw 24 and the port of the valve core 21. This causes part of the fluid medium to leak outward from the open end 14 of the valve body 1, reducing the medium pressure at the end of the valve core 21 near the closed end 13 of the valve body 1. The elastic force of the spring 22 is greater than the thrust of the medium on the valve core 21, causing the spring 22 to drive the spring seat 23, screw 24, and valve core 21 to retract. Since part of the medium leaks through the open end 14 of the valve body 1 after entering the valve body 1, the medium pressure output from the outlet 122 is reduced, thus giving the sequential pressure reducing valve a pressure reducing function. The sequential pressure reducing valve has the functions of both a conventional sequential valve and a pressure reducing valve.

[0042] Reference Figure 3A countersunk hole 214 is formed on the end face of the valve core 21 away from the upper valve sleeve 11. The countersunk hole 214 is concentric with the through hole 213, and the bottom surface of the countersunk hole 214 is a concave conical surface. The head of the screw 24 is located inside the countersunk hole 214, with a clearance allowance between it and the inner peripheral wall of the countersunk hole 214. The outer peripheral wall of the screw head 24 tapers towards the screw body from the outer convex arc surface 241. The outer convex arc surface 241 of the screw 24 abuts against the bottom surface of the countersunk hole 214 to cover the flow gap 7. The contact area between the screw head 24 and the bottom surface of the countersunk hole 214 is small, making it easier for the medium in the flow gap 7 to leak.

[0043] In order to increase the thrust of the medium on the head of the screw 24 within the flow gap 7, the end of the screw body near the head tapers towards the head, thereby increasing the cross-section of the flow gap 7 near the head of the screw 24. This helps to increase the thrust of the medium on the head, making it easier for the medium to push the head.

[0044] Reference Figure 3 The outer peripheral wall of the countersunk hole 214 is provided with a return hole 215. The return hole 215 is located between the annular groove 211 and the orifice of the countersunk hole 214. When the valve core 21 is in the initial state, the return hole 215 is connected to the outlet 122, so that the medium in the medium system can return through the outlet 122, the return hole 215, the countersunk hole 214 and the port of the lower valve sleeve 12 in sequence.

[0045] Reference Figure 2 A limiting sleeve 25 is provided on the inner side of the upper valve sleeve 11. The limiting sleeve 25 is located between the spring 22 and the lower valve sleeve 12. The limiting sleeve 25 is sleeved and connected to the screw 24. A limiting boss 251 is provided at the end of the limiting sleeve 25 near the spring 22. The limiting boss 251 is used to position the spring 22. When the valve core 21 is in the initial state, the end of the valve core 21 near the upper valve sleeve 11 abuts against the limiting sleeve 25.

[0046] Reference Figure 2 The spring seat 23 includes a main body section 231, a shoulder 232, and a guide section 233 arranged sequentially along the axial direction. The main body section 231, shoulder 232, and guide section 233 are coaxially arranged, and the shoulder 232 and guide section 233 are both cylindrical structures. The main body section 231 is closer to the screw 24 relative to the guide section 233. The end face of the main body section 231 away from the guide section 233 is provided with a threaded hole adapted to the screw 24. The spring 22 is sleeved on the main body section 231 and is located between the shoulder 232 and the lower valve sleeve 12. Several shims 26 are provided between the shoulder 232 and the spring 22. The shims 26 can be used to control the pre-deformation of the spring 22, thereby controlling the pressure required for the sequential pressure reducing valve to open.

[0047] The outer peripheral surface of the shoulder 232 is adapted to the inner peripheral wall of the upper valve sleeve 11, and the shoulder 232 guides the relative movement between the spring seat 23 and the upper valve sleeve 11. The diameter of the guide section 233 is larger than the diameter of the screw body 24 and smaller than the diameter of the shoulder 232. A guide hole 112 adapted to the guide section 233 is opened on the inner wall of the end of the upper valve sleeve 11 away from the lower valve sleeve 12. The guide hole 112 is a circular hole. The guide section 233 guides the movement of the spring seat 23. By setting the guide section 233, the fitting length between the spring seat 23 and the upper valve sleeve 11 can be increased, thereby improving the stability of the movement of the spring seat 23.

[0048] Reference Figure 2 The spring seat 23 is provided with a flow guiding channel 234, which includes a first flow guiding hole 2341 and a second flow guiding hole 2342. The first flow guiding hole 2341 is opened on the end face of the guide section 233, and the second flow guiding hole 2342 is opened on the outer peripheral wall of the main body section 231. The first flow guiding hole 2341 and the second flow guiding hole 2342 are connected. When the guide section 233 moves relative to the guide hole 112, an approximate piston-like telescopic movement is formed between the guide section 233 and the guide hole 112. By providing the flow guiding channel 234, the medium can enter and exit the guide hole 112 through the flow guiding channel 234, thereby helping to reduce the resistance when the guide section 233 moves relative to the guide hole 112.

[0049] The implementation principle of a sequential pressure reducing valve in this application embodiment is as follows: When the sequential pressure reducing valve is in use, the lower valve sleeve 12 of the valve body 1 is inserted into the inside of the medium container, and the inlet 121 on the valve body 1 is connected to the medium container. When the fluid medium enters the inlet 121 of the valve body 1, it flows through the through hole 212 and the flow gap 7 to the end of the valve core 21 near the closed end 13 of the valve body 1. The port of the valve core 21 away from the closed end 13 of the valve body 1 is blocked by the screw 24, so that the medium cannot flow to the end of the valve core 21 away from the closed end 13 of the valve body 1.

[0050] After the medium enters the inside of the valve body 1, the medium exerts pressure on the end face of the valve core 21 near the closed end 13 of the valve body 1, causing the medium to push the valve core 21 away from the closed end 13 of the valve body 1 until the annular groove 211 of the valve core 21 connects with the outlet 122 on the valve body 1. Then the medium in the valve body 1 flows out from the outlet 122, causing the sequential pressure reducing valve to open. During this process, the valve core 21 drives the spring seat 23 away from the closed end 13 of the valve body 1 through the screw 24, causing the spring 22 to be deformed under pressure. The amount of deformation of the spring 22 is required to move the valve core 21 to the position where the annular groove 211 connects with the outlet 122. That is, the medium system needs to reach a certain pressure value to open the sequential pressure reducing valve.

[0051] Example 2

[0052] Reference Figure 4The difference between this embodiment and embodiment 1 is that the spring seat 23 is coaxially arranged between the main body section 231 and the shoulder 232, and the guide section 233 is eccentrically arranged between the guide section 233 and the shoulder 232. In this case, the guide section 233 can prevent the spring seat 23 from rotating around the screw 24. When the screw 24 is locked with the spring seat 23, the screw 24 is not easy to drive the spring seat 23 to rotate, which helps to ensure the degree of locking of the screw 24.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A sequential pressure reducing valve characterized by: The valve assembly includes a valve body (1) and a valve core assembly (2). One end of the valve body (1) is an open end (14), and the other end is a closed end (13). The valve core assembly (2) includes a valve core (21), a spring (22), and a spring seat (23) arranged sequentially along the axial direction. The valve core (21) is located away from the closed end (13) of the valve body (1) relative to the spring seat (23). The valve core (21) has a through hole (213). A screw (24) passes through the through hole (213) of the valve core (21). A flow gap (7) for medium to pass through is formed between the screw (24) and the through hole (213). The screw (24) passes through the valve core (21) and the spring (22) and is threadedly connected to the spring seat (23). The inner wall of the valve body (1) has an annular limiting surface (123). The annular limiting surface (123) faces the valve body (1). The closed end (13) has a spring (22) located between the annular limiting surface (123) and the spring seat (23). The spring (22) is used to force the spring seat (23) away from the open end (14) of the valve body (1). The peripheral wall of the valve body (1) is provided with an inlet (121) and an outlet (122). The inlet (121) is away from the open end (14) of the valve body (1) relative to the outlet (122). The middle part of the outer peripheral wall of the valve core (21) is recessed to form an annular groove (211). The annular groove (211) is used to connect the inlet (121) and the outlet (122). The valve core (21) is provided with a through hole (212) corresponding to the annular groove (211). When the valve core (21) is in the initial state, the inlet (121) is connected to the annular groove (211), and the outer peripheral wall of the valve core (21) closes the outlet (122).

2. A sequence pressure reducing valve according to claim 1, characterized in that: The screw (24) head transitions from the convex arc surface (241) to the screw body.

3. A sequential pressure reducing valve according to claim 1, characterized in that: The screw (24) has a tapered transition at the end of the body near the head.

4. A sequential pressure reducing valve according to claim 1, characterized in that: The valve body (1) is provided with a limiting sleeve (25) on its inner side. The limiting sleeve (25) is located between the spring (22) and the annular limiting surface (123). The limiting sleeve (25) is sleeved and connected to the screw (24). When the valve core (21) is in the initial state, the end of the valve core (21) near the closed end (13) of the valve body (1) abuts against the limiting sleeve (25).

5. A sequential pressure reducing valve according to claim 4, characterized in that: The limiting sleeve (25) has a limiting boss (251) at one end near the spring (22), and the limiting boss (251) is used to position the spring (22).

6. A sequential pressure reducing valve according to claim 1, characterized in that: The spring seat (23) includes a main body section (231), a shoulder (232) and a guide section (233) arranged sequentially along the axial direction. The main body section (231) is close to the screw (24) relative to the guide section (233). The main body section (231) is provided with a threaded hole adapted to the screw (24). The spring (22) is sleeved on the main body section (231). The spring (22) is located between the shoulder (232) and the annular limiting surface (123). The wall of the open end (14) of the closed end (13) of the valve body (1) is provided with a guide hole (112) adapted to the guide section (233).

7. A sequential pressure reducing valve according to claim 6, characterized in that: The spring seat (23) is provided with a flow channel (234), which includes a first flow hole (2341) and a second flow hole (2342). The first flow hole (2341) is opened on the end face of the guide section (233), and the second flow hole (2342) is opened on the outer peripheral wall of the main body section (231). The first flow hole (2341) and the second flow hole (2342) are connected.

8. A sequential pressure reducing valve according to claim 6, characterized in that: Several washers (26) are provided between the shoulder (232) and the spring (22).

9. A sequential pressure reducing valve according to claim 6, characterized in that: The main body section (231) is coaxially arranged with the shoulder (232), and the guide section (233) is eccentrically arranged with respect to the shoulder (232).

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