A valve core assembly for a shut-off valve

Abstract

This utility model discloses a valve core assembly for a gate valve, belonging to the field of gate valve technology. The key technical points are: it includes a valve cap, a valve cover, a valve stem, and a plug. The valve cover is connected to the valve cap, and the valve stem movably passes through the valve cap and valve cover. The plug is connected to one end of the valve stem. A positioning sleeve, a spring, and a first sealing ring are fitted on the outer side of the valve stem. A positioning element is mounted on the outer side of the valve stem. The two ends of the spring abut against the positioning sleeve and the positioning element respectively. The valve stem moves and drives the positioning element to cooperate with the positioning sleeve to compress the spring, or the spring pushes the positioning element to reset the valve stem. The first sealing ring is located between the valve stem and the valve cap, and is used to seal between the valve stem and the valve cap. The spring acts on the positioning sleeve, thereby pressing the first sealing ring tightly inside the valve cap through the positioning sleeve. This utility model achieves dynamic sealing between the valve stem and the valve cap through the dynamic first sealing ring, improving sealing performance and enhancing the durability and reliability of the seal.

Description

Technical Field

[0001] This utility model belongs to the field of gate valve technology, and specifically relates to a valve core assembly for a gate valve. Background Technology

[0002] Chinese Patent No. CN214578883U discloses a push-button stop valve, including a valve body, a valve stem, a valve cover, and a handwheel. The valve body has an inlet end and an outlet end, and a valve seat connecting the inlet end and the outlet end is also provided inside the valve body. The valve cover is connected to the valve body. The inner end of the valve stem is located inside the valve body, and the outer end of the valve stem extends out of the valve cover and is fixedly connected to the handwheel. A first sealing ring is embedded in the outer wall of the inner end of the valve stem. The valve stem has a radially protruding abutment located inside the valve cover. A compression spring is provided between the valve cover and the handwheel, and the compression spring provides elastic force so that the abutment always tends to abut against the valve cover. A latching mechanism is provided between the valve cover and the handwheel, which can engage the valve cover and the handwheel when the handwheel is pressed down.

[0003] The above technical solution has at least the following defects: The push-button gate valve uses a first sealing ring embedded in the outer wall of the valve stem to ensure the sealing between the valve stem and the valve cover. However, since the first sealing ring is statically embedded in the outer wall of the valve stem, and the push-button gate valve needs to move the valve stem to block or detach from the valve seat to achieve opening and closing, the static first sealing ring has a circular cross-section. When the first sealing ring contacts the valve cover, it is a surface contact, resulting in high frictional resistance. Each movement of the valve stem will cause the first sealing ring to rub and scrape against the valve cover, which is prone to abnormal deformation, thus losing the sealing performance. The durability and reliability of the seal are difficult to maintain in the long term. Utility Model Content

[0004] The purpose of this utility model is to address the aforementioned problems in the existing technology by proposing a valve core assembly for a shut-off valve. The technical problem to be solved by this utility model is: how to effectively improve sealing performance.

[0005] The above-mentioned technical objective of this utility model can be achieved through the following technical solution: A valve core assembly for a stop valve includes a valve cap, a valve cover, a valve stem, and a plug. The valve cover is connected to the valve cap, and the valve stem is movably inserted through the valve cap and the valve cover. The plug is connected to one end of the valve stem. A positioning sleeve, a spring, and a first sealing ring are sleeved on the outside of the valve stem. A positioning element is mounted on the outside of the valve stem. The two ends of the spring abut against the positioning sleeve and the positioning element, respectively. The valve stem moves and drives the positioning element to cooperate with the positioning sleeve to squeeze the spring, or the spring pushes the positioning element to drive the valve stem to reset. The first sealing ring is located between the valve stem and the valve cap. The first sealing ring is used to seal between the valve stem and the valve cap. The spring acts on the positioning sleeve, thereby pressing the first sealing ring into the valve cap through the positioning sleeve.

[0006] In the valve core assembly for a shut-off valve described above, the valve cap has a first receiving groove adapted to the first sealing ring, and the first sealing ring is located in the first receiving groove.

[0007] In the valve core assembly for a shut-off valve described above, a limiting step is provided inside the valve cap, and the lower end face of the positioning sleeve abuts against the step surface of the limiting step.

[0008] In the valve core assembly for a shut-off valve described above, the lower end face of the positioning sleeve abuts against the upper end of the first sealing ring.

[0009] In the valve core assembly for a shut-off valve described above, there are two first sealing rings spaced apart from each other, and a separator gasket is fitted on the outer side of the valve stem. The separator gasket is located between the two first sealing rings, and the ends of the two first sealing rings abut against the upper and lower ends of the separator gasket, respectively.

[0010] In the valve core assembly for a shut-off valve described above, a second sealing ring is sleeved on the outer side of the valve stem. The second sealing ring is located between the valve stem and the valve cover, and is used to seal the valve stem and the valve cover.

[0011] In the valve core assembly for a shut-off valve described above, the valve cover has a second receiving groove adapted to the second sealing ring, and the second sealing ring is located in the second receiving groove.

[0012] In the valve core assembly for a shut-off valve described above, the outer wall of the valve stem has a positioning ring groove for positioning the positioning element, and the positioning element is located within the positioning ring groove.

[0013] In the valve core assembly for a shut-off valve described above, the positioning sleeve is hollow and has a positioning cavity, and the spring is located inside the positioning cavity.

[0014] In the valve core assembly for a shut-off valve described above, the valve cover and the valve cap are threadedly connected. The valve cover has a positioning flange, the end face of which abuts against the end face of the valve cap. A third sealing ring is provided between the valve cover and the valve cap, and a fourth sealing ring is sleeved on the outer side of the valve cap.

[0015] In summary, the beneficial effects of this utility model compared to the prior art are as follows:

[0016] The two ends of the spring abut against the positioning sleeve and the positioning element, respectively. The spring force acts on the positioning sleeve, which presses the first sealing ring into the valve cap, thus achieving an initial seal between the valve stem and the valve cap. When the valve stem moves, the valve stem drives the positioning element to cooperate with the positioning sleeve to compress the spring, causing the spring to elastically deform. Alternatively, the elastic restoring force of the spring pushes the positioning element to move and reset, and the positioning element drives the valve stem to move and reset. Since both the first sealing ring and the positioning sleeve are directly fitted on the outside of the valve stem, the first sealing ring is in a dynamic compensation state. It can adapt to the movement of the valve stem and maintain the seal between the valve stem and the valve cap, thus achieving a dynamic seal between the valve stem and the valve cap. This significantly improves the sealing performance between the two and effectively reduces the friction and wear of the first sealing ring, thereby improving the durability and reliability of the seal. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment;

[0018] Figure 2 This is a cross-sectional view of an embodiment;

[0019] Figure 3 This is a partial cross-sectional view of an embodiment.

[0020] Reference numerals in the attached drawings: 1. Valve cap; 2. Valve cover; 3. Valve stem; 4. Plug; 5. Positioning sleeve; 6. Spring; 7. Positioning element; 8. First sealing ring; 9. Second sealing ring; 10. Third sealing ring; 11. Fourth sealing ring; 12. First receiving groove; 13. Second receiving groove; 14. Limiting step; 15. Separating washer; 17. Positioning ring groove; 18. Positioning cavity; 19. Positioning flange. Detailed Implementation

[0021] The following are specific embodiments of the present invention, which are described in conjunction with the accompanying drawings. However, the present invention is not limited to these embodiments.

[0022] A valve core assembly for a shut-off valve, such as Figures 1 to 3 As shown, it includes a valve cap 1, a valve cover 2, a valve stem 3, and a plug 4. The valve cap 1 is used to install on a stop valve.

[0023] The valve cover 2 is connected to the valve cap 1. In this embodiment, the valve cover 2 and the valve cap 1 are threaded together, which facilitates production and assembly and is also beneficial for later maintenance.

[0024] Furthermore, the valve cover 2 has a positioning flange 19, the end face of which abuts against the end face of the valve cap 1. Through the abutting action of the two, the relative position of the valve cover 2 and the valve cap 1 is stable when they are threaded together, which is conducive to rapid assembly.

[0025] The valve stem 3 is movably inserted through the valve cap 1 and the valve cover 2. The plug 4 is threaded to one end of the valve stem 3 for easy disassembly and maintenance. The plug 4 is used to seal the water passage hole of the valve seat of the gate valve.

[0026] The valve stem 3 is fitted with a positioning sleeve 5, a spring 6 and a first sealing ring 8 on its outer side, and a positioning element 7 is installed on the outer side of the valve stem 3.

[0027] Specifically, the positioning element 7 is fitted onto the outer wall of the valve stem 3. The outer wall of the valve stem 3 has a positioning ring groove 17 for positioning the positioning element 7. The positioning element 7 is located in the positioning ring groove 17. The positioning element 7 is positioned by the positioning ring groove 17, thereby achieving relative stability between the positioning element 7 and the valve stem 3. That is, when the valve stem 3 moves, it drives the positioning element 7 to move.

[0028] The two ends of the spring 6 abut against the positioning sleeve 5 and the positioning element 7 respectively. The valve stem 3 moves and drives the positioning element 7 to cooperate with the positioning sleeve 5 to squeeze the spring 6, or the spring 6 pushes the positioning element 7 to drive the valve stem 3 to reset.

[0029] Specifically, the valve stem 3 is moved by pressing it with external force. The valve stem 3 drives the positioning part 7 to move towards the positioning sleeve 5. The positioning part 7 cooperates with the positioning sleeve 5 to squeeze the spring 6. After the external force is removed, the elastic restoring force of the spring 6 acts on the positioning part 7, causing the positioning part 7 to move away from the positioning sleeve 5 and simultaneously drive the valve stem 3 to move, until the positioning part 7 and the valve stem 3 are reset.

[0030] The first sealing ring 8 is located between the valve stem 3 and the valve cap 1. The first sealing ring 8 is used to seal between the valve stem 3 and the valve cap 1. The spring 6 acts on the positioning sleeve 5, thereby pressing the first sealing ring 8 into the valve cap 1 through the positioning sleeve 5.

[0031] In this embodiment, there are two first sealing rings 8, spaced apart. A separator washer 15 is fitted on the outer side of the valve stem 3, located between the two first sealing rings 8. The ends of the two first sealing rings 8 abut against the upper and lower end faces of the separator washer 15, respectively. Specifically, the force of the spring 6 acts on the positioning sleeve 5. The lower end of the positioning sleeve 5 abuts against the upper end of the upper first sealing ring 8, the lower end of the upper first sealing ring 8 abuts against the upper end face of the separator washer 15, and the lower end face of the separator washer 15 abuts against the upper end face of the lower first sealing ring 8. The first sealing ring 8 abuts against the inner wall of the valve cap 1, thereby pressing the lower first sealing ring 8 into the valve cap 1 through the force of the spring 6. The separator gasket 15 is pressed against the lower first sealing ring 8, and the upper first sealing ring 8 is pressed against the separator gasket 15. The positioning sleeve 5 is pressed against the upper first sealing ring 8, thus pressing both first sealing rings 8, the separator gasket 15, and the positioning element 7 into the valve cap 1, ensuring stable positioning and effective sealing between the valve stem 3 and the valve cap 1 by the two first sealing rings 8.

[0032] It should be noted that the number of the first sealing rings 8 can be increased or decreased as needed, and there is no specific limit to this.

[0033] Furthermore, the valve cap 1 has a first receiving groove 12 adapted to the first sealing ring 8. The first sealing ring 8 is located in the first receiving groove 12. The position of the first sealing ring 8 is limited by the first receiving groove 12, which can effectively ensure the stability of the position of the first sealing ring 8, thereby ensuring the effective sealing between the valve stem 3 and the valve cap 1 by the first sealing ring 8.

[0034] A limiting step 14 is provided inside the valve cap 1. The lower end face of the positioning sleeve 5 abuts against the step surface of the limiting step 14. Through the abutting action of the two, the position of the positioning sleeve 5 is stabilized, thereby ensuring that the positioning part 7 can cooperate with the positioning sleeve 5 to compress the spring 6, and also preventing the positioning sleeve 5 from pressing the two first sealing rings 8 and the separator gasket 15 too tightly.

[0035] The positioning sleeve 5 is hollow and has a positioning cavity 18. The spring 6 is located in the positioning cavity 18. The positioning cavity 18 restricts and guides the spring 6, which can not only effectively ensure the stability of the spring 6 when it is compressed or restored, and ensure that the spring 6 can act stably on the positioning sleeve 5, but also effectively prevent the spring 6 from being excessively deformed to the side, thereby adversely affecting the service life of the spring 6.

[0036] It should be noted that since both first sealing rings 8 are directly fitted onto the outer wall of the valve stem 3, they are pressed into the valve cap 1 and kept stable only by the force applied to the positioning sleeve 5 by the spring 6. Therefore, when the valve stem 3 moves and drives the positioning element 7, and the positioning sleeve 5 squeezes the spring 6 or the elastic restoring force of the spring 6 pushes the positioning element 7 to reset so that it drives the valve stem 3 to reset, both first sealing rings 8 are in a dynamic compensation state. The two first sealing rings 8 can adapt to the movement of the valve stem 3 and maintain the seal between the valve stem 3 and the valve cap 1.

[0037] Therefore, the two first sealing rings 8 in this embodiment can achieve dynamic sealing between the valve stem 3 and the valve cap 1, effectively reducing the friction and wear of the first sealing rings 8. Compared with the static sealing achieved by the static sealing ring in the prior art, this significantly improves the sealing performance and enhances the durability and reliability of the seal.

[0038] A second sealing ring 9 is fitted on the outer side of the valve stem 3. The second sealing ring 9 is located between the valve stem 3 and the valve cover 2. The second sealing ring 9 is used to seal between the valve stem 3 and the valve cover 2, thereby effectively ensuring the sealing performance between the valve stem 3 and the valve cover 2.

[0039] The valve cover 2 has a second receiving groove 13 that is adapted to the second sealing ring 9. The second sealing ring 9 is located in the second receiving groove 13. The position of the second sealing ring 9 is limited by the second receiving groove 13, which can effectively ensure the stability of the second sealing ring 9, thereby ensuring the effective sealing between the valve stem 3 and the valve cover 2 by the second sealing ring 9.

[0040] A third sealing ring 10 is provided between the valve cover 2 and the valve cap 1. The third sealing ring 10 seals the valve cover 2 and the valve cap 1, thereby ensuring the sealing between them. A fourth sealing ring 11 is fitted on the outside of the valve cap 1. After the valve cap 1 is assembled, the fourth sealing ring 11 ensures the sealing between the valve cap 1 and adjacent components.

[0041] The specific embodiments described herein are merely illustrative examples of the spirit of this utility model; those skilled in the art to which this utility model pertains may make various modifications or additions to the described specific embodiments or adopt similar methods to replace them, but without departing from the spirit of this utility model or exceeding the scope defined by the appended claims.

Claims

1. A valve core assembly for a shut-off valve, characterized in that: The utility model provides a valve, including bonnet (1), bonnet (2), valve stem (3) and plug (4), bonnet (2) is connected with bonnet (1), valve stem (3) is set up in bonnet (1) and bonnet (2) movably, plug (4) is connected with one end of valve stem (3), the outside of valve stem (3) is equipped with locating sleeve (5), spring (6) and first sealing ring (8), the outside of valve stem (3) is equipped with locating piece (7), both ends of spring (6) are respectively with locating sleeve (5) and locating piece (7) abut, valve stem (3) moves and drives locating piece (7) to make it cooperate locating sleeve (5) extrude spring (6) or spring (6) promotes locating piece (7) to make it drive valve stem (3) reset, first sealing ring (8) is located between valve stem (3) and bonnet (1), and first sealing ring (8) is used for sealing between valve stem (3) and bonnet (1), spring (6) acts on locating sleeve (5), and then through locating sleeve (5) tight first sealing ring (8) in bonnet (1).

2. A poppet assembly for a globe valve according to claim 1, wherein: The bonnet (1) has a first accommodating groove (12) adapted to the first sealing ring (8) in the bonnet (1).

3. A poppet assembly for a globe valve as defined in claim 1, wherein: The bonnet (1) is provided with a limiting step (14) in the bonnet (1), and the lower end surface of the locating sleeve (5) abuts against the step surface of the limiting step (14).

4. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The lower end surface of the locating sleeve (5) abuts against the upper end of the first sealing ring (8).

5. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The first sealing ring (8) has two and is spaced apart, the outer side of the valve stem (3) is sleeved with a separation washer (15), the separation washer (15) is located between the two first sealing rings (8), and the ends of the two first sealing rings (8) abut against the upper and lower ends of the separation washer (15) respectively.

6. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The outer side of the valve stem (3) is sleeved with a second sealing ring (9), and the second sealing ring (9) is located between the valve stem (3) and the bonnet (2), and the second sealing ring (9) is used for sealing between the valve stem (3) and the bonnet (2).

7. A poppet assembly for a globe valve according to claim 6 wherein: The bonnet (2) has a second accommodating groove (13) adapted to the second sealing ring (9) in the bonnet (2).

8. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The outer side wall of the valve stem (3) has a positioning ring groove (17) for positioning the locating piece (7), and the locating piece (7) is located in the positioning ring groove (17).

9. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The locating sleeve (5) is hollow and has a positioning cavity (18), and the spring (6) is located in the positioning cavity (18).

10. A valve trim assembly for a globe valve according to any one of claims 1, 2 or 3, wherein: The bonnet (2) is threadedly connected with the bonnet (1), the bonnet (2) has a positioning flange (19), the end surface of the positioning flange (19) abuts against the end surface of the bonnet (1), a third sealing ring (10) is arranged between the bonnet (2) and the bonnet (1), and the outer side of the bonnet (1) is sleeved with a fourth sealing ring (11).

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