External pressure-adjustable one-way sequence valve

Abstract

The utility model discloses an external pressure-adjustable one-way sequence valve which comprises a front end valve sleeve and a rear end valve sleeve, the front end valve sleeve and the rear end valve sleeve are connected and internally provided with a through axial hole, a first oil duct is arranged in an inner hole of the front end valve sleeve, and a one-way valve seat provided with a one-way valve element with an inner conical surface is arranged in the first oil duct. An inner hole of the rear-end valve sleeve is of an inverted-T-shaped structure, a hollow valve element matched with the one-way valve element and provided with an outer conical surface and a pressure adjusting assembly are arranged at the small head end and the large head end of the inverted-T-shaped structure respectively, a second oil channel is formed in the front end of the small head end, and the pressure adjusting assembly comprises an adjusting threaded sleeve. The adjusting screw sleeve extends out of the rear end valve sleeve to be in threaded connection with the locking nut, a counter bore is formed in the end, close to the hollow valve element, of the adjusting screw sleeve, the spring is arranged in the counter bore and attached to the end face, opposite to the outer conical face, of the hollow valve element, and pressure is adjusted by unscrewing the locking nut and rotating the adjusting screw sleeve clockwise and anticlockwise. The problem that the pressure cannot be adjusted after a traditional one-way sequence valve is assembled in a pipeline is solved.

Description

Technical Field

[0001] This utility model relates to the field of hydraulic valves, and in particular to an externally adjustable pressure one-way sequence valve. Background Technology

[0002] Sequence valves are a type of pressure control valve, mainly used between a pressure source and a load. Their function varies depending on the application scenario, including: controlling the sequential action of multiple components; acting as a balancing valve to prevent the cylinder from falling due to its own weight; acting as an unloading valve; and acting as a back pressure valve to improve system performance.

[0003] In hydraulic systems, a one-way sequence valve is usually composed of a check valve and a sequence valve connected in parallel. In one direction, the check valve is active, and in the other direction, the sequence valve is active.

[0004] Taking our company's interlocking hydraulic system for outriggers as an example, to avoid the influence of ambient temperature and flow rate on the back pressure after switching, we have connected a one-way sequence valve in series after the outrigger valve assembly. This provides a certain pre-value pressure for the extension and retraction of the outrigger cylinders, preventing the back pressure from affecting the outrigger cylinders under pressure unloading conditions. Conventional one-way sequence valves are all pipe-type connections, occupying little space and easy to install. Different pressure levels of the one-way sequence valve opening values ​​are set according to different working conditions. To meet the influence of different ambient temperatures and flow rates on the one-way sequence valve opening values, existing one-way sequence valves require disconnection of the pipeline and adjustment, which is inefficient, time-consuming, and labor-intensive.

[0005] CN200910135705.3 discloses a one-way sequence valve and a hydraulic sequence control system for a bracket using the one-way sequence valve. Specifically, it discloses an inlet opening device, a return opening device, and a valve body. The inlet and return opening devices are threadedly connected to the inlet and return ports of the valve body, respectively. When liquid enters from the inlet, it first passes through the inlet device. When the pressure exceeds the set pressure of the inlet valve core, the inlet device opens, and the liquid enters the internal cavity. When the pressure inside the cavity reaches the set value, the valve core moves, and the liquid returns after overcoming the force of a small spring. Although the solution mentioned in this invention patent has higher adjustment capabilities and pressure ratings, it is larger and heavier, requiring more space and specific installation locations, resulting in higher relative costs.

[0006] CN201220585012.1 discloses a series-assembled, high-capacity one-way sequence valve, specifically comprising a tubular valve body, a main valve stem, a one-way valve sleeve, and a threaded connector. The one-way valve sleeve is installed within the valve body, with one end of the valve body connected to the threaded connector. The other end of the valve body is provided with a main valve stem seat. The main valve stem is located at the center of the valve body, with its small end inserted into the main valve stem seat and its large end located within the one-way valve sleeve. Multiple channels are evenly distributed in a conical shape around the main valve stem seat. A small spring is provided between the one-way valve sleeve and the main valve stem seat. The one-way valve sleeve mates with the large end of the main valve stem. An adjusting screw is provided within the threaded connector. A large spring is provided between the large end of the main valve stem and the adjusting screw support. The threaded connector has supporting ribs and through holes, with the supporting ribs abutting against one end of the one-way valve sleeve. By integrating the one-way valve and the sequence valve into a single valve body using the above method, a series-assembled structure is formed, resulting in a compact structure and small footprint. Although the solution mentioned in the patent can achieve large flow rate and small installation space, it cannot directly adjust the preset pressure value through the patching structure.

[0007] CN201910764845.0 discloses a tubular one-way sequence valve, whose valve body is designed as a tubular structure. The valve core assembly is installed into the valve cavity from the front port of the valve body, including a one-way valve sleeve, a valve stem, a first spring, and a spring baffle. The rear port of the first flow channel of the one-way valve sleeve forms a first valve port. The valve stem passes through the mounting hole and forms a first cone structure at the rear end that can seal with the first valve port. The spring baffle is connected to the front end of the valve stem and presses the first spring between the rear end wall of the spring baffle and the one-way valve sleeve, so that the valve core assembly forms an integral assembly. This integral assembly structure is more compact and can be easily installed into the valve cavity from the front port of the valve body. The disadvantage of the one-way sequence valve mentioned in this invention compared to this patent is that it cannot be directly adjusted and preset through an external structure.

[0008] CN202210194328.6 discloses a tubular one-way sequence valve, specifically including a valve body. A mounting plate is fixedly connected to the bottom of the valve body, and an adjustment assembly and a release mechanism are installed at the top. An installation cavity is formed inside the valve body. This invention utilizes a flow-increasing assembly. When liquid enters the valve body through the inlet pipe, the L-shaped top channel and the U-shaped bottom channel are filled with liquid. At this time, the oil in the annular cavity and conical orifice exerts an upward force on the valve core. This force is insufficient to move the valve core, but only provides auxiliary thrust for subsequent valve core movements. The liquid acts directly and vertically on the bottom of the valve core through the U-shaped bottom channel, providing the main thrust to move the valve core. When the valve core moves upward to open the outlet pipe, the liquid can quickly flow to the outlet pipe through the L-shaped top channel and the U-shaped bottom channel, increasing the flow rate of the valve body and reducing the internal pressure. The one-way sequence valve mentioned in that invention has the disadvantages of being larger, more complex to install, and occupying more space compared to this patent.

[0009] Existing technologies for tubular one-way sequence valves that can meet the requirements of confined spaces are too simple in structure and cannot be directly installed in pipelines to regulate pressure. On the other hand, the structure of single-way sequence valves that can directly regulate pressure in pipelines is a combination of a one-way valve, a sequence valve, and a separate valve body. These valves are larger in size, have a relatively complex structure, high manufacturing costs, and require a large space for installation, making them unsuitable for use in confined and densely distributed pipelines. Summary of the Invention

[0010] To address the shortcomings of existing technologies, this utility model provides an externally adjustable pressure-controlled one-way sequence valve. This solves the problems of existing tubular one-way sequence valves having overly simple structures that cannot be directly installed in pipelines to adjust pressure values, while one-way sequence valves that can directly adjust pressure values ​​in pipelines are large in size, have relatively complex structures, high manufacturing costs, require a large amount of space for installation, and have excessively high manufacturing, maintenance, and debugging costs.

[0011] The technical solution provided by this utility model is as follows:

[0012] This utility model provides an externally adjustable pressure one-way sequence valve, including a front valve sleeve and a rear valve sleeve. The front valve sleeve and the rear valve sleeve are connected and have a through axial hole inside. The inner hole of the front valve sleeve has a first oil passage. The first oil passage has a one-way valve seat for mounting a one-way valve core with an inner conical surface. The inner hole of the rear valve sleeve is set with a convex structure and a hollow valve core with an outer conical surface that cooperates with the one-way valve core. A pressure regulating component is respectively set at the small end and the large end of the convex structure. The front end of the small end has a second oil passage. The pressure regulating component includes an adjusting screw sleeve. The adjusting screw sleeve extends out of the rear valve sleeve and is threadedly connected to the locking nut. The end near the hollow valve core has a countersunk hole. A spring is set in the countersunk hole and fits against the end face of the hollow valve core relative to the outer conical surface. The pressure is adjusted by loosening the locking nut and rotating the adjusting screw sleeve clockwise and counterclockwise.

[0013] Furthermore, both ends of the front valve sleeve and the adjusting screw sleeve are provided with internally threaded connecting sections that are threaded to the pipeline joint.

[0014] Furthermore, the adjusting screw sleeve includes a screw rod and a screw head. The screw rod extends to the rear valve sleeve and is threadedly connected to the locking nut. The adjusting screw sleeve is embedded in the large end and threadedly connected to the rear valve sleeve. The screw rod is stepped, including a small outer diameter section with a countersunk hole and a large outer diameter section with external threads. The screw rod has three different diameter sections inside: front, middle, and rear. The diameters of the front and rear sections are both larger than the diameter of the middle section. The front section corresponds to the small outer diameter section, and the large outer diameter section corresponds to the middle and rear sections.

[0015] Furthermore, the inner bore of the front valve sleeve has three different diameter sections: front, middle, and rear. The diameters of the front and rear sections are larger than that of the middle section. The middle section has a first oil passage and a one-way valve seat. The front section is a threaded connection section that is threaded to the pipeline connector. The rear section is a threaded mounting section that is threaded to the rear valve sleeve. The rear valve sleeve has a convex-shaped structure, including an extended section and a non-extended section. The extended section and the non-extended section are respectively set at the small end and the large end of the inner bore of the rear valve sleeve. The extended section is threaded to the mounting section of the rear section of the front valve sleeve.

[0016] Furthermore, the front valve sleeve is a hexagonal tube, and the rear section of the front valve sleeve includes a first cylinder extending toward the rear valve sleeve side. The outer diameter of the first cylinder is equal to the diameter of the inscribed circle of the hexagonal tube. The non-extended section of the rear valve sleeve is a hexagonal tube, and the extended section is a circular tube. A second cylinder with an outer diameter equal to the diameter of the inscribed circle of the hexagonal tube is provided between the extended section and the non-extended section. The length of the small end is equal to the total length of the second cylinder and the extended section. When the front valve sleeve and the rear valve sleeve are connected, the first cylinder and the second cylinder abut against each other.

[0017] Furthermore, the extended section has a sealing groove for installing an O-ring, and when the first cylinder and the second cylinder abut together, the O-ring is located between the first cylinder and the second cylinder.

[0018] Furthermore, both the first and second oil channels are petal-shaped oil channels, which are formed by cutting out a central circle and several small circles evenly distributed around the central circle, and the small circles do not intersect or touch each other.

[0019] Furthermore, the one-way valve seat is a groove recessed forward at one end of the first oil passage facing the hollow valve core. The one-way valve core is installed in the groove, and the diameter of the groove is greater than the diameter of the central circle but less than the diameter of the circumscribed circle formed by several small circles.

[0020] Furthermore, the hollow valve core is stepped on one side facing the one-way valve core, including a front section with an outer conical surface and a rear section confined in the second oil passage. The maximum diameter of the front section with the outer conical surface is equal to the center circle, and the diameter of the rear section confined in the second oil passage is greater than the center circle.

[0021] Furthermore, the small outer diameter section is provided with a sealing groove for installing O-rings and retaining rings.

[0022] Beneficial effects

[0023] The one-way sequence valve provided by this utility model, by adding an adjusting screw sleeve and a locking nut structure to the traditional one-way sequence valve structure, can adjust and set the opening pressure of the sequence valve without disassembling the connecting pipe joints, thus improving the convenience of pipeline and maintenance.

[0024] This utility model's one-way sequence valve changes the problem that traditional one-way sequence valves cannot adjust pressure after being assembled into pipelines, greatly reducing the limitations of the application scenarios of pipe-type one-way valves, reducing labor and maintenance costs, and improving their ease of use. Attached Figure Description

[0025] Figure 1 This is a diagram showing the closed state of an externally adjustable pressure-type one-way sequence valve.

[0026] Figure 2 This is a diagram showing the opening state of an externally adjustable pressure one-way sequence valve.

[0027] Figure 3 This is a diagram showing the opening state of an externally adjustable pressure one-way sequence valve.

[0028] Figure 4 This is a schematic diagram of the front valve sleeve.

[0029] Figure 5 This is a structural schematic diagram of the rear valve sleeve.

[0030] Figure 6 This is a schematic diagram of the adjusting screw sleeve.

[0031] Explanation of reference numerals in the attached diagram: 1. Front valve sleeve; 2. Rear valve sleeve; 3. One-way valve core; 4. Hollow valve core; 5. Adjusting screw sleeve; 6. Locking nut; 7. Spring; 8. First O-ring; 9. Second O-ring; 10. Retaining ring. Detailed Implementation

[0032] The present invention will be further described below with reference to the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present invention, and should not be used to limit the scope of protection of the present invention.

[0033] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicating orientation or positional relationships, are based on the orientation or positional relationships shown in the accompanying drawings and are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, features defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0034] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0035] Example 1

[0036] like Figure 1As shown, this utility model embodiment provides an externally adjustable pressure one-way sequence valve, including a front valve sleeve 1 and a rear valve sleeve 2. The front valve sleeve 1 and the rear valve sleeve 2 are connected and have a through axial hole inside. The inner hole of the front valve sleeve 1 has a first oil passage. The first oil passage has a one-way valve seat for mounting a one-way valve core 3 with an inner conical surface. The inner hole of the rear valve sleeve 2 is set with a convex structure and cooperates with the one-way valve core 3. A hollow valve core 4 with an outer conical surface and a pressure regulating component are respectively set at the small end and the large end of the convex structure. The front end of the small end has a second oil passage. The pressure regulating component includes an adjusting screw sleeve 5. The adjusting screw sleeve 5 extends out of the rear valve sleeve 2 and is threadedly connected to the locking nut 6. The end near the hollow valve core 4 has a countersunk hole. A spring 7 is set in the countersunk hole and fits against the end face of the hollow valve core 4 relative to the outer conical surface. The pressure is adjusted by loosening the locking nut 6 and rotating the adjusting screw sleeve 5 clockwise and counterclockwise.

[0037] The one-way sequence valve provided by this utility model, by adding an adjusting screw sleeve and a locking nut structure to the traditional one-way sequence valve structure, can adjust and set the opening pressure of the sequence valve without disassembling the connecting pipe joints, thus improving the convenience of pipeline and maintenance.

[0038] Example 2

[0039] like Figure 1As shown, this utility model embodiment provides an externally adjustable pressure one-way sequence valve, including a front valve sleeve 1 and a rear valve sleeve 2, a one-way valve core 3, a hollow valve core 4, a spring 7, and a pressure regulating assembly. The front valve sleeve 1 has a first oil passage machined in its middle section, within which a one-way valve seat is located. The other two ends are machined as connecting sections with internal threads for connection to pipe fittings and installation sections for connection to the rear valve sleeve 2. The first oil passage is evenly distributed in a petal-like shape around the one-way valve seat. A one-way valve core 3 is installed on the one-way valve seat. The one-way valve core 3 has an inner conical surface that mates with the outer conical surface of the hollow valve core 4 located in the rear valve sleeve 2. The one-way valve core 3 extends from the front valve sleeve 1... The valve sleeve 2 is installed inside the one-way valve seat with one end of its inner conical surface facing the B port. The inner hole of the rear valve sleeve 2 is convex in shape, including a small end (C port) and a large end (D port). The front end of the small end has a second oil passage. The pressure regulating component includes an adjusting screw sleeve 5. The adjusting screw sleeve 5 extends out of the rear valve sleeve 2 and is threadedly connected to the locking nut 6. One end of the adjusting screw sleeve 5 near the hollow valve core 4 has a countersunk hole. The spring 7 is set in the countersunk hole and fits against the end face of the hollow valve core 4 relative to the outer conical surface. The hollow valve core 4 is installed from the D port of the rear valve sleeve 2. Then, the spring 7 is installed into the countersunk hole of the adjusting screw sleeve 5, and then the pressure regulating component is installed. The pressure is adjusted by loosening the locking nut 6 and rotating the adjusting screw sleeve 5 clockwise and counterclockwise. The large end of the rear valve sleeve 2 is machined with an internal thread that is threadedly connected to the adjusting screw sleeve 5. The end of the adjusting screw sleeve 5 opposite to the connection section of the front valve sleeve 1 connected to the pipe joint is also equipped with a connection section connected to the pipe joint. Figure 4 and Figure 5 ).

[0040] In this embodiment, the adjusting screw sleeve 5 includes a screw rod and a screw head. The screw rod extends to the rear valve sleeve 2 and is threadedly connected to the locking nut 6. The adjusting screw sleeve 5 is embedded in the large end and threadedly connected to the rear valve sleeve 2. The screw rod is stepped and includes a small outer diameter section with a countersunk hole and a large outer diameter section with external threads. The screw rod has three different diameter sections inside: front, middle, and rear. The diameters of the front and rear sections are larger than the diameter of the middle section. The front section corresponds to the small outer diameter section, and the large outer diameter section corresponds to the middle and rear sections.

[0041] In this embodiment, the front valve sleeve 1 is a hexagonal tube, and the rear section of the front valve sleeve 1 includes a first cylinder extending toward the rear valve sleeve side. The outer diameter of the first cylinder is equal to the diameter of the inscribed circle of the hexagonal tube. The non-extended section of the rear valve sleeve 2 is a hexagonal tube, and the extended section is a circular tube. A second cylinder with an outer diameter equal to the diameter of the inscribed circle of the hexagonal tube is provided between the extended section and the non-extended section. The length of the small end is equal to the total length of the second cylinder and the extended section. When the front valve sleeve 1 and the rear valve sleeve 2 are connected, the first cylinder and the second cylinder abut against each other. Figures 4-6 ).

[0042] In this embodiment, the extended section has a sealing groove for installing the first O-ring 8. When the first cylinder and the second cylinder abut, the first O-ring 8 is located between the first cylinder and the second cylinder.

[0043] Specifically, one end of the adjusting sleeve 5 is machined with an external thread to connect with the installation section with an internal thread, and the other end is machined with an internal thread to connect with the pipe joint. The retaining ring 10 and the second O-ring 9 are sequentially installed into the sealing groove on the small outer diameter section. The locking nut 6 is screwed into the external thread of the adjusting sleeve extending to the large end. Then, the adjusting sleeve is screwed into the D port of the rear valve sleeve 2. The first O-ring 8 is installed in the sealing groove at the small end of the rear valve sleeve 2. Finally, the rear valve sleeve and the front valve sleeve are fitted together. After adjusting the pressure, the locking nut is tightened.

[0044] In this embodiment, both the first and second oil channels are petal-shaped oil channels. The petal-shaped oil channel is formed by cutting out a central circle and several small circles evenly distributed around the central circle, and the pairs of small circles do not intersect or touch each other. Figure 4 and Figure 5 ).

[0045] In this embodiment, the one-way valve seat is a groove recessed inward at one end of the first oil passage facing the hollow valve core. The one-way valve core is installed in the groove, and the diameter of the groove is larger than the diameter of the central circle but smaller than the diameter of the circumscribed circle formed by several small circles.

[0046] In this embodiment, the hollow valve core 4 is stepped on the side facing the one-way valve core 3, including a front section with an outer conical surface and a rear section confined in the second oil passage. The maximum diameter of the front section with the outer conical surface is equal to the center circle, and the diameter of the rear section confined in the second oil passage is greater than the center circle.

[0047] Working principle of the check valve: When oil enters the valve body through port c of the adjusting screw sleeve 5, the pressure acts on the check valve core 3, and the check valve core 3 moves towards port b, opening port a. At this time, the opening pressure of the check valve is close to zero, and the pressure loss is mainly due to the friction loss inside the valve body. The check valve works in this direction. Figure 2 and Figure 3 ).

[0048] Sequence valve working principle: When oil enters the petal-shaped channel of the valve body through port b of the front valve sleeve 1, the hydraulic pressure of the oil acts on the one-way valve core 3, pressing the one-way valve core 3 against the conical surface of the hollow valve core 4. At this time, port a is disconnected, and the pressure of the oil simultaneously acts on the annular stepped surface of the hollow valve core 4. When the actuators other than those in this path have completed their actions, the system pressure rises to the same value as the pressure set by the spring 7. The hydraulic pressure then begins to overcome the spring force and do work. The hollow valve core 4 begins to move towards port c, port a is opened, and the oil flows to the actuator connected to port c to overcome the load. In this direction, the sequence valve is activated. Figure 2 and Figure 3 ).

[0049] Pressure adjustment: This unidirectional sequence can be adjusted on-site according to the actual pressure required by the system. When the initial pressure value is less than the actual pressure value, the pressure setting value needs to be increased. In this case, simply loosen the locking nut 6, then rotate the adjusting sleeve 5 clockwise until the pressure value meets the requirements, and then tighten the locking nut 6. When the initial pressure value is greater than the actual pressure value, the pressure setting value needs to be decreased. In this case, simply loosen the locking nut 6, then rotate the adjusting sleeve 5 counterclockwise until the pressure value meets the requirements, and then tighten the locking nut 6. Figure 2 and Figure 3 ).

[0050] Definitions of abbreviations and key terms

[0051] A check valve is a directional control valve in a hydraulic system that allows oil to flow in only one direction and blocks it from flowing in the opposite direction.

[0052] Sequence valve: A pressure valve that uses a certain pressure to control the opening and closing of an oil circuit;

[0053] One-way sequence valve: A one-way sequence valve is composed of a one-way valve and a sequence valve connected in parallel. The one-way valve operates in one direction, and the sequence valve operates in the other direction.

Claims

1. An externally adjustable pressure one-way sequence valve, characterized in that, The device includes a front valve sleeve and a rear valve sleeve, which are connected and have a through axial hole. The front valve sleeve has a first oil passage in its inner hole, and a one-way valve seat with an inner conical surface is installed in the first oil passage. The rear valve sleeve has a convex-shaped inner hole and a hollow valve core with an outer conical surface that cooperates with the one-way valve core. A pressure regulating component is located at the small end and large end of the convex-shaped structure, respectively. A second oil passage is located at the front end of the small end. The pressure regulating component includes an adjusting screw sleeve, which extends out of the rear valve sleeve and is threaded to a locking nut. A countersunk hole is located at the end near the hollow valve core. A spring is located in the countersunk hole and fits against the end face of the hollow valve core relative to the outer conical surface. The pressure is adjusted by loosening the locking nut and rotating the adjusting screw sleeve clockwise and counterclockwise.

2. The externally adjustable pressure one-way sequence valve according to claim 1, characterized in that, Both ends of the front valve sleeve and the adjusting screw sleeve are provided with internally threaded connecting sections that are threaded to the pipeline joint.

3. The externally adjustable pressure one-way sequence valve according to claim 2, characterized in that, The adjusting screw sleeve includes a screw rod and a screw head. The screw rod extends to a rear valve sleeve and is threadedly connected to a locking nut. The adjusting screw sleeve is embedded in the large end and threadedly connected to the rear valve sleeve. The screw rod has a stepped shape, including a small outer diameter section with a countersunk hole and a large outer diameter section with external threads. The screw rod has three different diameter sections inside: front, middle, and rear. The diameters of the front and rear sections are both larger than the diameter of the middle section. The front section corresponds to the small outer diameter section, and the large outer diameter section corresponds to the middle and rear sections.

4. The externally adjustable pressure one-way sequence valve according to claim 2, characterized in that, The inner bore of the front valve sleeve has three different diameter sections: front, middle, and rear. The diameters of the front and rear sections are larger than that of the middle section. The middle section has a first oil passage and a one-way valve seat. The front section is a threaded connection section that is threaded to the pipeline connector. The rear section is a threaded mounting section that is threaded to the rear valve sleeve. The rear valve sleeve has a convex-shaped structure, including an extended section and a non-extended section. The extended section and the non-extended section are respectively set at the small end and the large end of the inner bore of the rear valve sleeve. The extended section has an external thread corresponding to the mounting section of the rear section of the front valve sleeve.

5. The externally adjustable pressure one-way sequence valve according to claim 4, characterized in that, The front valve sleeve is a hexagonal tube. The rear section of the front valve sleeve includes a first cylinder extending toward the rear valve sleeve. The outer diameter of the first cylinder is equal to the diameter of the inscribed circle of the hexagonal tube. The non-extended section of the rear valve sleeve is a hexagonal tube, and the extended section is a circular tube. A second cylinder with an outer diameter equal to the diameter of the inscribed circle of the hexagonal tube is provided between the extended section and the non-extended section. The length of the small end is equal to the total length of the second cylinder and the extended section. When the front valve sleeve and the rear valve sleeve are connected, the first cylinder and the second cylinder abut against each other.

6. The externally adjustable pressure one-way sequence valve according to claim 5, characterized in that, The extended section has a sealing groove for installing an O-ring. When the first cylinder and the second cylinder abut together, the O-ring is located between the first cylinder and the second cylinder.

7. The externally adjustable pressure one-way sequence valve according to claim 1, characterized in that, Both the first and second oil channels are petal-shaped oil channels. The petal-shaped oil channel is formed by cutting out a central circle and several small circles evenly distributed around the central circle, and the small circles do not intersect or touch each other.

8. The externally adjustable pressure one-way sequence valve according to claim 7, characterized in that, The one-way valve seat is a groove recessed inward at the end of the first oil passage facing the hollow valve core. The one-way valve core is installed in the groove. The diameter of the groove is larger than the diameter of the central circle but smaller than the diameter of the circumscribed circle formed by several small circles.

9. The externally adjustable pressure one-way sequence valve according to claim 7, characterized in that, The hollow valve core is stepped on one side facing the one-way valve core, including a front section with an outer conical surface and a rear section confined in the second oil passage. The maximum diameter of the front section with the outer conical surface is equal to the center circle, and the diameter of the rear section confined in the second oil passage is greater than the center circle.

10. The externally adjustable pressure one-way sequence valve according to claim 3, characterized in that, The small outer diameter section has a sealing groove for installing O-rings and retaining rings.

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