Low-pressure relief valve

Abstract

The utility model discloses a low pressure relief valve which comprises a valve body and a valve core arranged in the valve body, the front end of the valve body is provided with an external thread part, the rear end of the valve body is sleeved with a shell, a medium channel is arranged in the valve body, the valve core is arranged in the medium channel, the shell is provided with a first pressure relief hole, and the valve core is arranged in the first pressure relief hole. A second pressure relief hole is formed in the valve body, the valve element comprises a movable rod, a sealing block is arranged at the front end of the movable rod, a pressure relief check block is arranged on the side, away from an external thread part, of the sealing block, an internal thread part is arranged at the rear end of the valve body, a movable sleeve is in threaded connection with the internal thread part, and the movable sleeve can move in the shell. A through hole is formed in the movable sleeve, the movable rod is arranged in the through hole in a penetrating mode, a reset spring is arranged between the movable sleeve and the pressure relief check block, a horizontal sliding block is arranged on the movable sleeve, a sliding rail for limiting the movable sleeve to rotate along with the valve body is arranged in the shell, and the horizontal sliding block is arranged on the sliding rail in a sliding mode. The pressure relief valve is easy and convenient to operate, the opening and closing pressure of the pressure relief valve can be flexibly adjusted without opening the shell, and adaptability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure relief valves, and particularly relates to a low-pressure pressure relief valve. Background Art

[0002] A low-pressure pressure relief valve is a valve used to control and release the pressure in a system, and is usually used to prevent excessive pressure from damaging equipment or endangering safety. Its main function is to automatically open when the system pressure exceeds the set safety value, and release the excess pressure, thereby protecting the components or equipment in the system.

[0003] The existing low-pressure pressure relief valves adopt a fixed structure. Adjusting the opening and closing pressure usually requires disassembling the valve and replacing the internal spring or other components, which not only has a high maintenance cost, reduces the service life of the valve, but also increases the operation difficulty, requires certain professional skills, is difficult to quickly adjust in actual use, and affects the user experience. Summary of the Utility Model

[0004] The technical problem to be solved by the utility model is to provide a low-pressure pressure relief valve, which is simple and convenient to operate, can flexibly adjust the opening and closing pressure of the pressure relief valve without opening the shell, and has strong adaptability.

[0005] To solve the above technical problem, a low-pressure pressure relief valve of the utility model includes a valve body and a valve core arranged in the valve body. The front end of the valve body is provided with an external thread portion, the rear end of the valve body is sleeved with a shell, a medium channel is arranged in the valve body, the valve core is arranged in the medium channel, a first pressure relief hole is arranged on the shell, a second pressure relief hole is arranged on the valve body, both the first pressure relief hole and the second pressure relief hole are communicated with the medium channel, the valve core includes a movable rod, a sealing block is arranged at the front end of the movable rod, a pressure relief block is arranged on the side of the sealing block away from the external thread portion, the pressure relief block is arranged corresponding to the second pressure relief hole, an internal thread portion is arranged at the rear end of the valve body, a movable sleeve is threadedly connected to the internal thread portion, the movable sleeve can move in the shell, a through hole is arranged on the movable sleeve, the movable rod passes through the through hole, a return spring is arranged between the movable sleeve and the pressure relief block, a horizontal slider is arranged on the movable sleeve, and a slide rail for restricting the movable sleeve from rotating with the valve body is arranged in the shell, and the horizontal slider is slidably arranged on the slide rail.

[0006] The movable sleeve includes a movable block, the through hole is arranged at the center of the movable block, a side wall extending towards the stop portion is arranged on the outside of the movable block, the side wall is threadedly connected to the internal thread portion, an adjustment chamber is formed between the side wall and the movable block, the return spring is arranged in the adjustment chamber, one end of the return spring abuts against the stop portion, and the other end abuts against the movable block.

[0007] The shell is made of a translucent material.

[0008] The valve body is provided with an external nut portion, and the housing abuts against the external nut portion.

[0009] The housing is provided with convex ribs, and the rear end of the valve body is provided with corresponding grooves, and the convex ribs are clamped in the grooves.

[0010] A limiting stop block is further arranged in the housing.

[0011] A stepped portion is arranged in the medium channel, and the sealing block abuts against the stepped portion.

[0012] Spherical seals are arranged on the side walls of the movable blocks.

[0013] A limiting portion is arranged on the movable rod. The diameter of the movable rod is smaller than that of the through hole, and the diameter of the limiting portion is larger than that of the through hole.

[0014] A first sealing ring is arranged between the sealing block and the pressure relief block, and a second sealing ring is arranged between the convex rib and the groove.

[0015] When the present utility model is in use, when the system pressure is within the normal range, the sealing block in the valve core tightly abuts against the stepped portion in the medium channel, ensuring the sealing of the channel and preventing medium leakage. The return spring maintains a compressed state in this state, ensuring that the valve core is in the closed position. When the system pressure gradually increases, the pressure of the medium acts on the sealing block and the pressure relief block, pushing the movable rod to move along the through hole of the valve body. The medium passes through the through hole and enters the housing, and is discharged from the first pressure relief hole. When the pressure reaches a certain level, the pressure relief block moves to a position aligned with the second pressure relief hole, opening the second pressure relief hole. At the same time, the spherical seal abuts against the first pressure relief hole, and the medium is quickly discharged through the second pressure relief hole, thereby quickly reducing the pressure inside the system. Once the pressure drops back to the safe range, the acting force of the return spring pushes the movable rod and the pressure relief block back to their original positions, and the sealing block abuts against the stepped portion again, closing the second pressure relief hole, and the system returns to the normal sealed state. At the same time, the user can adjust the position of the movable sleeve by rotating the valve body or the housing. Since the horizontal positions of the valve body and the housing are unchanged, rotating either part will cause the movable sleeve to move along the slide rail to change the compression degree of the return spring, thereby flexibly adjusting the opening and closing pressure of the pressure relief valve.

[0016] The beneficial effects brought by the present utility model are:

[0017] Through the position adjustment function of the movable sleeve, the present utility model can change the compression degree of the return spring, thereby flexibly adjusting the opening and closing pressure of the pressure relief valve, being able to adapt to different pressure requirements and enhancing the applicability of the equipment.

[0018] The present utility model is easy to operate. Without opening the housing, the opening and closing pressure of the pressure relief valve can be adjusted, and the position of the movable sleeve can be observed intuitively.

[0019] The utility model has a compact structure and good sealing performance, improving the safety and reliability of the equipment. Brief Description of the Drawings

[0020] Figure 1 is a schematic structural view of the utility model.

[0021] Figure 2 is a cross-sectional view of the utility model.

[0022] Figure 3 is a schematic structural view of the valve core of the utility model.

[0023] In the figures: 1, valve body; 2, valve core; 3, external thread part; 4, housing; 5, medium channel; 6, first pressure relief hole; 7, second pressure relief hole; 8, movable rod; 9, sealing block; 10, pressure relief baffle; 11, internal thread part; 12, movable sleeve; 13, through hole; 14, return spring; 15, horizontal slider; 16, slide rail; 17, movable block; 18, side wall; 19, adjustment chamber; 20, external nut part; 21, rib; 22, groove; 23, limit baffle; 24, step part; 25, spherical seal; 26, limit part; 27, first sealing ring; 28, second sealing ring. Detailed Embodiments

[0024] Next, the technical solutions in the embodiments of the present utility model will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present utility model; obviously, the described embodiments are only a part of the embodiments of the present utility model, rather than all the embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present utility model.

[0025] According to Figures 1 to 3As shown in the figure, a low-pressure relief valve of the present utility model includes a valve body 1 and a valve core 2 disposed inside the valve body 1. The front end of the valve body 1 is provided with an external thread portion 3, and a housing 4 is sleeved on the rear end. A medium channel 5 for the flow of the medium is provided inside the valve body 1, and the valve core 2 is located in the medium channel 5. A first relief hole 6 communicating with the medium channel 5 is provided on the housing 4, and a second relief hole 7 communicating with the medium channel 5 is also provided on the valve body 1 for releasing the medium when the pressure is too high. The valve core 2 includes a movable rod 8. A sealing block 9 is provided at the front end of the movable rod 8. A relief baffle 10 is provided on the side of the sealing block 9 away from the external thread portion 3, and the relief baffle 10 corresponds to the second relief hole 7 on the valve body 1. An internal thread portion 11 is provided at the rear end of the valve body 1, and a movable sleeve 12 is threadedly connected to the internal thread portion 11. The movable sleeve 12 can move inside the housing 4. A through hole 13 is provided on the movable sleeve 12, and the movable rod 8 passes through the through hole 13. A return spring 14 is provided between the movable sleeve 12 and the relief baffle 10. When the pressure in the medium channel 5 is less than the set value, the medium is discharged from the second relief hole 7 to release the pressure. When the pressure in the medium channel 5 exceeds the set value, the first relief hole 6 is closed, and the relief baffle 10 in the valve core 2 opens the second relief hole 7 as the movable rod 8 moves to release the excess pressure. After the pressure is relieved, the return spring 14 can automatically return the movable rod 8 to the initial state to close the second relief hole 7. By adjusting the position of the movable sleeve 12, the user can change the compression degree of the return spring 14, thereby adjusting the opening and closing pressure of the relief valve. When the movable sleeve 12 moves inward, the return spring 14 is further compressed, increasing the pre-pressure of the spring. This causes the relief baffle 10 to be pushed at a higher pressure, and then the second relief hole 7 is opened to release the pressure. On the contrary, when the movable sleeve 12 moves outward, the compression degree of the return spring 14 decreases, and the pre-pressure of the spring decreases. The relief baffle 10 can be pushed to open the second relief hole 7 at a lower system pressure. With this structure, the opening and closing pressure of the relief valve can be flexibly adjusted according to actual needs to adapt to different working environments and pressure requirements.

[0026] The movable sleeve 12 includes a movable block 17. A through hole 13 is provided at the center of the movable block 17, and the movable rod 8 passes through the through hole 13, ensuring the free movement of the valve core 2. A side wall 18 extends outwards from the outside of the movable block 17. The side wall 18 extends towards the stop portion and is threadedly connected to the internal thread portion 11 of the valve body 1, ensuring that the movable sleeve 12 can be adjusted by rotation inside the housing 4. An adjustment chamber 19 is formed between the movable block 17 and its side wall 18, and the return spring 14 is provided in the adjustment chamber 19. One end of the return spring 14 abuts against the stop portion, and the other end contacts the movable block 17. With this structure, the compression and release of the return spring 14 are effectively controlled.

[0027] An external nut portion 20 is provided on the valve body 1, and the housing 4 abuts against the external nut portion 20. In addition, a rib 21 is provided on the housing 4, and a groove 22 is correspondingly provided at the rear end of the valve body 1. A clamping structure is formed between the rib 21 and the groove 22 to ensure a tight connection between the housing 4 and the valve body 1 and prevent loosening or displacement during use. To ensure smooth adjustment of the movable sleeve 12, a horizontal slider 15 is provided on the movable block 17, and a slide rail 16 is correspondingly provided inside the housing 4. The horizontal slider 15 can move freely along the slide rail 16. With such a structure, the user only needs to rotate the valve body 1 to adjust the position of the movable sleeve 12. Since the housing 4 is semi-transparent, the user can observe the position of the movable sleeve 12 without disassembling the housing 4. At the same time, a limiting block 23 is also provided inside the housing 4 to further limit the movement range of the movable block 17 and prevent the movement of the movable sleeve 12 from exceeding the set safety range.

[0028] A stepped portion 24 is provided in the medium channel 5, and the sealing block 9 can tightly abut against the stepped portion 24 during the movement of the valve core 2, thereby realizing effective sealing of the medium channel 5 and preventing medium leakage. A spherical seal 25 is provided on the movable rod 8, and the spherical seal 25 abuts against the through hole 13, further enhancing the sealing performance of the entire structure and preventing the medium from leaking through the through hole 13 of the movable block 17. A limiting portion 26 is also provided on the movable rod 8. The diameter of the movable rod 8 is smaller than the diameter of the through hole 13, while the diameter of the limiting portion 26 is larger than the diameter of the through hole 13, so as to ensure that the movable rod 8 can move freely in the through hole 13 and at the same time prevent excessive displacement under the action of the limiting portion 26, ensuring the reliability of the structure.

[0029] In addition, to enhance the sealing effect, a first sealing ring 27 is provided between the sealing block 9 and the pressure relief block 10, and a second sealing ring 28 is provided between the rib 21 and the groove 22 of the valve body 1 to ensure that no medium leakage occurs at the connection between the housing 4 and the valve body 1.

[0030] When the present utility model is in use, when the system pressure is within the normal range, the sealing block 9 in the valve core 2 tightly abuts against the stepped portion 24 in the medium passage 5, ensuring the sealing of the passage and preventing medium leakage. The return spring 14 maintains a compressed state in this state, ensuring that the valve core 2 is in the closed position. When the system pressure gradually increases, the pressure of the medium acts on the sealing block 9 and the pressure relief block 10, pushing the movable rod 8 to move along the through hole 13 of the valve body 1. The medium passes through the through hole 13 into the housing 4 and is discharged from the first pressure relief hole 6. When the pressure reaches a certain level, the pressure relief block 10 moves to a position aligned with the second pressure relief hole 7, opening the second pressure relief hole 7. At the same time, the spherical seal 25 abuts against the first pressure relief hole 6, and the medium is quickly discharged through the second pressure relief hole 7, thereby rapidly reducing the pressure inside the system. Once the pressure drops back to the safe range, the acting force of the return spring 14 pushes the movable rod 8 and the pressure relief block 10 back to their original positions, and the sealing block 9 abuts against the stepped portion 24 again, closing the second pressure relief hole 7, and the system resumes the normal sealed state. At the same time, the user can adjust the position of the movable sleeve 12 by rotating the valve body 1 or the housing 4. Since the horizontal positions of the valve body 1 and the housing 4 remain unchanged, rotating either part will cause the movable sleeve 12 to move along the slide rail 16 to change the compression degree of the return spring 14, thereby flexibly adjusting the opening and closing pressure of the pressure relief valve.

[0031] The beneficial effects brought by the present utility model are as follows:

[0032] Through the position adjustment function of the movable sleeve, the present utility model can change the compression degree of the return spring, thereby flexibly adjusting the opening and closing pressure of the pressure relief valve, being able to adapt to different pressure requirements and enhancing the applicability of the equipment.

[0033] The present utility model is easy to operate. Without opening the housing, the opening and closing pressure of the pressure relief valve can be adjusted, and the position of the movable sleeve can be visually observed.

[0034] The present utility model has a compact structure and good sealing performance, improving the safety and reliability of the equipment.

[0035] The above description is only a preferred embodiment of the present utility model. Therefore, all equivalent changes or modifications made according to the structure, features, and principles described in the scope of the patent application of the present utility model are included in the scope of the patent application of the present utility model.

Claims

1. A low-pressure relief valve, comprising a valve body and a valve core arranged in the valve body, wherein the front end of the valve body is provided with an external threaded portion, and the rear end of the valve body is sleeved with a housing, characterized in that: A medium channel is provided in the valve body, and the valve core is arranged in the medium channel. A first pressure relief hole is provided on the shell, and a second pressure relief hole is provided on the valve body. The first pressure relief hole and the second pressure relief hole are both connected to the medium channel. The valve core includes a movable rod, and a sealing block is provided at the front end of the movable rod. A pressure relief block is provided on the side of the sealing block away from the external threaded portion, and the pressure relief block is arranged corresponding to the second pressure relief hole. An internal threaded portion is provided at the rear end of the valve body, and a movable sleeve is threadedly connected to the internal threaded portion. The movable sleeve can move in the shell, and a through hole is provided on the movable sleeve. The movable rod is inserted in the through hole, and a reset spring is provided between the movable sleeve and the pressure relief block. A horizontal slider is provided on the movable sleeve, and a slide rail for limiting the movable sleeve from rotating with the valve body is provided in the shell, and the horizontal slider is slidably arranged on the slide rail.

2. A low pressure relief valve according to claim 1, characterized in that: The movable sleeve includes a movable block, the through hole is arranged at the center of the movable block, a side wall extending toward the stop portion is arranged on the outer side of the movable block, the side wall is threadedly connected to the internal thread portion, an adjustment chamber is formed between the side wall and the movable block, the return spring is arranged in the adjustment chamber, one end of the return spring abuts against the stop portion, and the other end abuts against the movable block.

3. A low pressure relief valve according to claim 1, characterized in that: The shell is made of translucent material.

4. A low pressure relief valve according to claim 1, characterized in that: The valve body is provided with an outer nut portion, and the shell body abuts against the outer nut portion.

5. A low pressure relief valve according to claim 1, characterized in that: The shell body is provided with a convex rib, and the rear end of the valve body is provided with a corresponding groove, and the convex rib is clamped in the groove.

6. A low pressure relief valve according to claim 1, characterized in that: A limit stopper is also arranged in the shell.

7. A low pressure relief valve according to claim 1, characterized in that: A step portion is provided in the medium channel, and the sealing block abuts against the step portion.

8. A low pressure relief valve according to claim 2, characterized in that: Spherical sealing parts are arranged on the side walls of the movable blocks.

9. A low pressure relief valve according to claim 1, characterized in that: A limiting portion is provided on the movable rod, the diameter of the movable rod is smaller than the through hole, and the diameter of the limiting portion is larger than the through hole.

10. A low pressure relief valve according to claim 5, characterized in that: A first sealing ring is arranged between the sealing block and the pressure relief stopper, and a second sealing ring is arranged between the convex rib and the groove.

Images