Pressure-adjustable control valve

Abstract

The utility model discloses a pressure-adjustable control valve which comprises a valve body, a valve rod capable of controlling on-off of the valve body is arranged in the valve body, and a limiting block capable of limiting the outward moving distance of the valve rod in the valve body is further arranged in the valve body. A channel penetrating through the upper end face and the lower end face of the valve rod is formed in the valve rod, a plug, a spring and an adjusting rod are sequentially arranged in the channel from bottom to top, the plug can plug a lower port of the channel under the action of the spring without external force, and the acting force of the spring on the plug is adjusted along with the change of the position of the adjusting rod. A communicating hole is formed in the adjusting rod, and the channel is communicated with the outside through the communicating hole. The utility model has the advantages that the number of required parts is small, the mechanism is compact, the process is simple and reliable, the cost is low, the conveying pressure is kept stable, and the safety of the system is improved; and secondly, the pressure of the conveying system is adjusted, meanwhile, the conveying system suitable for different pressure requirements is achieved, and the application range is widened.

Description

Technical Field

[0001] The utility model belongs to the technical field of valves, and specifically relates to a control valve with adjustable pressure. Background Art

[0002] A control valve is a control component in a pipeline fluid transportation system, which controls the flow state of the fluid in the pipeline and adjusts the flow rate. Among them, during use, in order to stabilize the pressure and protect the pipeline, a pressure control valve is usually used. The relief valve in the pressure control valve can control the hydraulic system to maintain a constant state when reaching the set pressure, so as to avoid damage to the pipeline or equipment in the system caused by a pressure increase due to a malfunction, thereby improving safety.

[0003] Currently, pressure control valves that can keep the system pressure constant can be easily found in the market. However, the applicant has found that for a set of control valves with pressure control and stable performance, their structures are often relatively complex and the cost is relatively high, while those with low prices often have unstable performance. Therefore, how to meet the user's needs with the most concise structure has high practical value. Summary of the Utility Model

[0004] In order to solve the problems existing in the prior art, the utility model aims to provide a control valve with adjustable pressure, which can keep the pressure of the transportation system stable, while having a simple structure, being easy to produce and manufacture, and reducing costs.

[0005] To achieve the above technical purposes and effects, the utility model is realized through the following technical solutions:

[0006] A control valve with adjustable pressure includes a valve body. A valve stem that can control the on-off of the valve body is arranged in the valve body, and a limit block that can limit the outward movement distance of the valve stem in the valve body is also arranged in the valve body. A channel penetrating the upper and lower end faces of the valve stem is opened in the valve stem. A plug, a spring, and an adjusting rod are sequentially arranged in the channel from bottom to top. Without external force, the plug can block the lower port of the channel under the action of the spring, and as the position of the adjusting rod changes, the force of the spring on the plug can be adjusted. A communication hole is opened in the adjusting rod, and the channel is communicated with the outside through the communication hole.

[0007] Further, a knob is arranged on the valve stem.

[0008] Further, the valve stem is threadedly connected to the valve body; and a sealing ring is arranged between the two.

[0009] Further, the limit block is a ring, and it is detachably arranged on the valve body through a locking screw.

[0010] Furthermore, the channel is a stepped hole, which includes a first channel section and a second channel section, the aperture of the first channel section is smaller than the aperture of the second channel section, and an internal thread is provided in the upper half of the second channel section.

[0011] Furthermore, the spring is in abutment connection with the plug and the adjusting rod.

[0012] Furthermore, the plug is a stepped shaft, which includes a first plug section, a second plug section and a third plug section, and the outer diameters of the first plug section and the third plug section are both smaller than the outer diameter of the second plug section.

[0013] Furthermore, the outer surface of the second section of the plug is evenly provided with multiple groups of grooves along the axial direction.

[0014] Furthermore, the adjustment rod is a stepped shaft, which includes an adjustment section one and an adjustment section two, the outer diameter of the adjustment section one is smaller than the outer diameter of the adjustment section two, and the adjustment section two is provided with an external thread and a pair of planes.

[0015] Furthermore, a scale is engraved on the outer surface of the second adjustment section.

[0016] The beneficial effects of the utility model are as follows: the utility model requires a small number of parts, has a compact structure, a simple and reliable process, and a low cost, while maintaining a stable delivery pressure, effectively avoiding damage to pipelines or equipment caused by overpressure, and improving the safety of the system; secondly, the control valve has adjustable overflow pressure, which can adjust the delivery system pressure while realizing a delivery system suitable for different pressure requirements, thereby improving the scope of application.

[0017] The above description is only an overview of the technical solution of the utility model. In order to more clearly understand the technical means of the utility model and implement it according to the contents of the specification, the following is a detailed description of the preferred embodiment of the utility model with the accompanying drawings. The specific implementation method of the utility model is given in detail by the following embodiments and their drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present application. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention. In the drawings:

[0019] Figure 1 This is a schematic diagram of the structure of the control valve of the utility model;

[0020] Figure 2 This is a schematic diagram of the structure of the control valve of the utility model without the knob;

[0021] Figure 3 This is a cross-sectional view of the control valve of the present utility model;

[0022] Figure 4 This is a cross-sectional view after the installation of the middle component of the valve stem of the present utility model;

[0023] Figure 5 This is a schematic structural view of the valve stem of the present utility model;

[0024] Figure 6 This is a cross-sectional view of the valve stem of the present utility model;

[0025] Figure 7 This is a schematic structural view of the plug of the present utility model;

[0026] Figure 8 This is a schematic structural view of the adjusting rod of the present utility model;

[0027] Figure 9 This is a cross-sectional view of the adjusting rod of the present utility model.

[0028] Explanation of the reference numerals in the figure: 1. Valve body; 2. Valve stem; 3. Limit block; 4. Plug; 5. Spring; 6. Adjusting rod; 7. Knob; 8. Sealing ring; 21. Channel; 22. First section of the valve stem; 23. Second section of the valve stem; 24. Third section of the valve stem; 211. First section of the channel; 212. Second section of the channel; 221. Installation groove; 41. First section of the plug; 42. Second section of the plug; 43. Third section of the plug; 421. Groove; 61. Communication hole; 62. First adjusting section; 63. Second adjusting section. Detailed implementation manners

[0029] Next, the present utility model will be described in detail with reference to the accompanying drawings and in combination with embodiments.

[0030] It should be noted that all the directional indications (such as up, down, left, right, front, back, upper end, lower end, top, bottom...) in the embodiments of the present utility model are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0031] Refer to Figures 1-3 As shown, a pressure-adjustable control valve includes a valve body 1 through which a medium can pass. A valve stem 2 is arranged inside the valve body 1. Among them, refer to Figure 5As shown, in this embodiment, the valve stem 2 is a stepped shaft, which includes a first valve stem section 22, a second valve stem section 23, and a third valve stem section 24. The outer diameters of the first valve stem section 22 and the third valve stem section 24 are smaller than that of the second valve stem section 23, and an external thread is provided on the outer surface of the second valve stem section 23. When the valve stem 2 is installed in the valve body 1, the valve stem 2 is threadedly connected to the valve body 1 through the second valve body section 12, so that by rotating the valve stem 2, the valve stem 2 can move in and out of the valve body 1, thereby controlling the on-off of the valve body 1. In this embodiment, in order to facilitate the rotation of the valve stem 2, a knob 7 is provided at the upper end of the third valve stem section 24, and the valve stem 2 is rotated through the knob 7. In addition, in this embodiment, in order to prevent the medium from overflowing from the connection between the valve stem 2 and the valve body 1, a sealing ring 8 is provided between the first valve stem section 22 and the valve body 1. Among them, a circumferential installation groove 221 is provided on the outer surface of the first valve stem section 22, and the sealing ring 8 is arranged on the first valve stem section 22, so that when the valve stem 2 moves in and out of the valve body 1, the sealing ring 8 moves together with the valve stem 2.

[0032] See Figure 4 and Figure 6 As shown, in this embodiment, a channel 21 is provided in the valve stem 2, which penetrates through its upper and lower end faces. A plug 4, a spring 5, and an adjusting rod 6 are sequentially arranged in the channel 21 from bottom to top. Without external force, the plug 4 can block the lower port of the channel 21 under the action of the spring 5, and with the change of the position of the adjusting rod 6, the force of the spring 5 on the plug 4 is adjusted; among them, in this embodiment, the spring 5 is in contact connection with both the plug 4 and the adjusting rod 6.

[0033] In addition, continue to see Figure 6 As shown, in this embodiment, the channel 21 is a stepped hole, which includes a first channel section 211 and a second channel section 212. The aperture of the first channel section 211 is smaller than that of the second channel section 212, and an internal thread is provided in the upper half of the second channel section 212.

[0034] See Figure 7 As shown, in this embodiment, the plug 4 is a stepped shaft, which includes a first plug section 41, a second plug section 42, and a third plug section 43. The outer diameters of the first plug section 41 and the third plug section 43 are both smaller than that of the second plug section 42. The outer diameter of the second plug section 42 is slightly smaller than the outer diameter of the second channel section 212, and the outer diameter of the third plug section 43 is smaller than the inner hole diameter of the spring 5; when the plug 4 is installed in the channel 21, see Figure 4As shown, under the action of the spring 5, one section 41 of the plug is inserted through the first section 211 of the channel to block the channel 21. At this time, the outer surface of the one section 41 of the plug fits with the inner surface of the first section 211 of the channel, and the stepped surface between the one section 41 of the plug and the two section 42 of the plug abuts against the stepped surface between the first section 211 of the channel and the second section 212 of the channel. The three section 43 of the plug is inserted into the inner hole of the spring 5, and one end of the spring 5 abuts against the stepped surface between the two section 42 of the plug and the three section 43 of the plug. Among them, in this embodiment, the mating surface between the one section 41 of the plug and the first section 211 of the channel adopts a conical design. Six groups of grooves 421 are evenly arranged along the axial direction on the outer surface of the two section 42 of the plug. Of course, the number of groups of the above-mentioned grooves 421 is only one implementation manner, and is not used to limit the scope of the present application. When implementing, other numbers of groups can also be set as long as the requirements are met.

[0035] See Figures 8-9 As shown, in this embodiment, the adjusting rod 6 is a stepped shaft, which includes an adjusting first section 62 and an adjusting second section 63. The outer diameter of the adjusting first section 62 is smaller than the outer diameter of the adjusting second section 63, and the outer diameter of the adjusting first section 62 is smaller than the inner hole diameter of the spring 5. And external threads are provided on the outer surface of the adjusting second section 63, and a pair of planes are provided. During installation, see Figure 4 As shown, the adjusting rod 6 is threadedly connected to the three section 43 of the plug through the adjusting second section 63. After connection, the adjusting first section 62 is inserted into the inner hole of the spring 5. At this time, the other end of the spring 5 abuts against the stepped surface between the adjusting first section 62 and the adjusting second section 63. When adjusting, the wrench is used to clamp the plane on the outer surface of the adjusting second section 63 to rotate the adjusting rod 6, so as to change the position of the adjusting rod 6 in the channel 21, thereby changing the compression amount of the spring 5, thereby adjusting the force of the spring 5 on the plug 4, and further adjusting the overflow pressure of the control valve. In order to more accurately adjust the position of the adjusting rod 6 in the channel 21, a scale is engraved on the outer surface of the adjusting second section 63. And a communication hole 61 is opened in the adjusting rod 6, and the channel 21 is communicated with the outside through the communication hole 61. Internal threads are provided at the upper end of the communication hole 61, and the internal threads in the communication hole 61 are used to connect with the return pipeline.

[0036] See Figures 2-3As shown, a limiting block 3 is further arranged in the valve body 1. The limiting block 3 is a ring, the aperture of its inner hole is slightly larger than the outer diameter of the third section 24 of the valve rod, but smaller than the outer diameter of the second section 23 of the valve rod. During installation, after the limiting block 3 is sleeved on the third section 24 of the valve rod, it is detachably arranged on the valve body 1 through a locking screw. When the valve rod 2 is rotated, the second section 23 of the valve rod is limited by the limiting block 3, so as to limit the outward movement distance of the valve rod 2 in the valve body 1.

[0037] The working principle of the present utility model is as follows:

[0038] During operation, the valve body 1 is connected to the pipeline in the conveying system, and the medium flows through the channel 21 in the valve body 1. When the pressure in the system exceeds the overflow pressure set by this control valve, at this time, the plug 4 is stressed, and the compression spring 5 moves towards the adjusting rod 6. The mating surface between the first section 41 of the plug and the first section 211 of the channel is separated. After the medium enters the second section 212 of the channel through the first section 211 of the channel, it enters the return pipeline through the communication hole 61, so as to realize overflow pressure relief, maintain the operation of the control valve at the set pressure, and further ensure the stability and safety of the system.

[0039] Among them, during the operation process, when the valve rod 2 is rotated into the valve body 1 by rotating the knob 7, the flow rate can be gradually reduced, and finally the control valve is closed; when the valve rod 2 is rotated out of the valve body 1 by rotating the knob 7, the control valve is opened, and during the continuous rotation process, the flow rate is increased; among them, when the second section 23 of the valve rod abuts against the limiting block 3, the flow rate is the largest.

[0040] In addition, when it is necessary to adjust the pressure in the system, the adjusting rod 6 is rotated by a wrench. When it moves towards the valve rod 2, the pressure of the system is increased, and when it moves away from the valve rod 2, the pressure of the system is reduced.

[0041] The above are only the preferred embodiments of the present utility model and are not used to limit the present utility model. For those skilled in the art, the present utility model can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model shall be included within the protection scope of the present utility model.

Claims

1. A pressure-adjustable control valve, comprising a valve body (1), wherein a valve stem (2) is arranged inside the valve body (1) and can control the on and off of the valve body (1), characterized in that: The valve body (1) is also provided with a limit block (3) capable of limiting the distance that the valve stem (2) moves outward in the valve body (1); the valve stem (2) is provided with a channel (21) penetrating the upper and lower end surfaces thereof, and the channel (21) is provided with a plug (4), a spring (5) and an adjusting rod (6) in sequence from bottom to top; in the absence of external force, the plug (4) can seal the lower end of the channel (21) under the action of the spring (5), and the force of the spring (5) on the plug (4) can be adjusted as the position of the adjusting rod (6) changes; the adjusting rod (6) is provided with a connecting hole (61), and the channel (21) is connected to the outside through the connecting hole (61).

2. The pressure-adjustable control valve according to claim 1, characterized in that: The valve stem (2) is provided with a knob (7).

3. The pressure-adjustable control valve according to claim 2, characterized in that: The valve stem (2) and the valve body (1) are threadedly connected, and a sealing ring (8) is provided between the two.

4. The pressure-adjustable control valve according to claim 1, characterized in that: The limit block (3) is a circular ring, which is detachably arranged on the valve body (1) by means of a locking screw.

5. The pressure-adjustable control valve according to claim 1, characterized in that: The channel (21) is a stepped hole, which comprises a first channel section (211) and a second channel section (212). The aperture of the first channel section (211) is smaller than the aperture of the second channel section (212), and an internal thread is provided at the upper half of the second channel section (212).

6. The pressure-adjustable control valve according to claim 1, characterized in that: The spring (5) is in abutment connection with the plug (4) and the adjusting rod (6).

7. The pressure-adjustable control valve according to claim 6, characterized in that: The plug (4) is a stepped shaft, which comprises a first plug section (41), a second plug section (42) and a third plug section (43), and the outer diameters of the first plug section (41) and the third plug section (43) are both smaller than the outer diameter of the second plug section (42).

8. The pressure-adjustable control valve according to claim 7, characterized in that: The outer surface of the second plug section (42) is evenly provided with a plurality of grooves (421) along the axial direction.

9. The pressure-adjustable control valve according to claim 6, characterized in that: The adjusting rod (6) is a stepped shaft, which comprises an adjusting first section (62) and an adjusting second section (63). The outer diameter of the adjusting first section (62) is smaller than the outer diameter of the adjusting second section (63), and an external thread and a pair of planes are provided on the outer surface of the adjusting second section (63).

10. The pressure-adjustable control valve according to claim 9, characterized in that: A scale is also engraved on the outer surface of the second adjustment section (63).

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