A check valve that maintains pressure balance

Abstract

The application discloses a pressure balance check valve, which comprises a valve body, a flow channel, a valve rod and a valve seat arranged in the valve body, a valve core arranged at the bottom of the valve rod, the valve core being capable of moving up and down in the flow channel and abutting against the valve seat for cutting off the communication of the flow channel, a pressure channel arranged in the valve core and extending to the top end of the valve core to communicate with the outside, a balance channel communicated with the bottom of the pressure channel, a buoyancy cavity communicated with the bottom of the balance channel, a floating block abutting against the inner wall arranged in the buoyancy cavity, a first spring arranged at the top of the floating block and extending into the balance channel, and a pressure ball abutting against the inner walls on both sides of the balance channel and connected with the first spring, wherein a valve block is arranged to cooperate with the pressure ball and balance the pressure received by the valve core, shift the pressure to the middle part of the valve core, prevent the sealing instability of the valve core on both sides and the valve seat due to the pressure imbalance, improve the sealing effect and avoid the leakage caused by the untimely pressure relief.

Description

Technical Field

[0001] This invention relates to a check valve for maintaining pressure balance, and belongs to the field of check valves. Background Technology

[0002] Valves are control components in fluid transport systems, serving functions such as shut-off, regulation, flow guidance, backflow prevention, pressure stabilization, flow diversion, and pressure relief. Valves used in fluid control systems range from the simplest shut-off valves to the various valves used in highly complex automated control systems, exhibiting a wide variety of types and specifications.

[0003] Existing check valves rely on the contact between the valve core and the valve seat for sealing. However, during the sealing process, the pressure imbalance inside the check valve after the flow is cut off can easily lead to poor sealing between the valve core and the valve seat. Existing gate valves generally balance the pressure by external pressure relief, but this method is inefficient and may cause leakage risk if pressure is not relieved in time. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a check valve that maintains pressure balance.

[0005] A check valve for maintaining pressure balance includes a valve body. The valve body contains a flow channel, a valve stem, and a valve seat. A valve core is located at the bottom of the valve stem. The valve core moves up and down within the flow channel via the valve stem and abuts against the valve seat to cut off the flow channel's connection. A pressure channel is located within the valve core, extending to both ends and connecting to the top of the valve core and the outside. A balance channel is connected to the bottom of the pressure channel, and a buoyancy chamber is connected to the bottom of the balance channel. A float abuts against the inner wall of the buoyancy chamber. A first spring is located at the top of the float, extending into the balance channel and connecting to… A pressure ball is connected to both sides of the balance channel inner wall. A valve block is set to cooperate with the pressure ball. When it is necessary to cut off the flow and close the valve, the float is subjected to pressure and floats upward, which drives the pressure ball to move upward. At the same time, the excessive pressure in the pressure channel in the flow channel applies pressure to the top of the pressure ball. The first spring at the bottom of the pressure ball is compressed or stretched by the combined action of pressure and buoyancy of the float to balance the pressure on the valve core and transfer the pressure to the middle of the valve core. This prevents the valve core from being unstable due to pressure imbalance on both sides and the valve seat, improves the sealing effect, and avoids leakage caused by untimely pressure relief.

[0006] Preferably, a first sealing sleeve is fixedly provided at the bottom of the valve core, and an opening is provided at the bottom of the buoyancy chamber. The first sealing sleeve is provided with an abutment portion that can selectively abut against the bottom of the float, and the abutment portion is used to prevent the float from detaching from the valve core.

[0007] Furthermore, the valve seat is provided with a second sealing sleeve, which includes a barbed portion that engages with the valve seat. The barbed portion is composed of a plurality of barbs, which can enhance the engagement effect between the second sealing sleeve and the valve seat, making the second sealing sleeve more stable.

[0008] Preferably, the inner wall of the second sealing sleeve is connected to an L-shaped water inlet channel extending to the top. A second spring is fixed inside the water inlet channel. The top of the second spring is provided with a buoyant sealing ball that abuts against the inner wall of the water inlet channel. When the valve core and valve seat are sealed, water enters the water inlet channel, and the sealing ball moves upward under dynamic buoyancy to abut against the second sealing sleeve at the bottom of the valve core, thereby enhancing the sealing effect.

[0009] Furthermore, the valve body is provided with a movable cavity surrounding the valve stem, and the outer wall of the valve stem is provided with a reinforcing ring located in the movable cavity. A third spring is fixed at the bottom of the reinforcing ring, and a reinforcing plate is provided at the bottom of the third spring. A pressure sleeve is provided on the valve stem that can selectively abut against the reinforcing plate. The bottom of the pressure sleeve is provided with a sealing component that can deform towards the central axis of the valve stem. When the valve stem moves up and down, it drives the reinforcing ring to move together. The reinforcing ring drives the reinforcing plate to move. Under the elastic force of the third spring, the reinforcing plate abuts against the pressure sleeve and applies force to the pressure sleeve. The pressure sleeve transmits pressure to the sealing component, causing the sealing component to deform and tightly abut against the outer wall of the valve stem to prevent water from entering.

[0010] Furthermore, the sealing component includes a third sealing sleeve fixed to the bottom of the moving cavity. The third sealing ring is provided with a compression groove, and a fourth sealing sleeve is provided inside the compression groove. A compression ball is provided between the third sealing sleeve and the fourth sealing sleeve. When the third sealing sleeve is subjected to pressure from the pressure sleeve, the compression groove will be compressed and deformed. The inner wall of the compression groove will be pushed towards the compression ball. With the support of the fourth sealing sleeve, the compression ball will exert force towards the valve stem, making the connection between the third sealing sleeve and the valve stem tighter, preventing water from entering the moving cavity and improving the sealing performance.

[0011] Furthermore, the top of the fourth sealing sleeve is provided with an inwardly recessed snap-fit ​​groove, and the extrusion ball abuts against the snap-fit ​​groove, which can provide stable support for the extrusion ball, while preventing the fourth sealing sleeve from moving outward due to the reaction force of the extrusion ball, thus failing to achieve the extrusion sealing effect.

[0012] Preferably, the top of the pressure sleeve is inclined, and the inner wall of the pressure sleeve is provided with a support sleeve fitted outside the valve stem to support the pressure sleeve and prevent excessive deformation, which would affect the sealing effect.

[0013] The beneficial effects of this invention are as follows: By setting the valve block and pressure ball to cooperate, when it is necessary to cut off the flow and close the valve, the float is subjected to pressure and floats upward, driving the pressure ball to move upward. At the same time, excessive pressure in the pressure channel in the flow channel applies pressure to the top of the pressure ball. The first spring at the bottom of the pressure ball is compressed or stretched by the combined action of pressure and buoyancy of the float to balance the pressure on the valve core and transfer the pressure to the middle of the valve core. This prevents the valve core from being unstable due to pressure imbalance on both sides and the valve seat, improves the sealing effect, and avoids leakage caused by untimely pressure relief. Attached Figure Description

[0014] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0015] Figure 1 This is a cross-sectional structural diagram of the present invention;

[0016] Figure 2 for Figure 1 Enlarged detail view of point A in the middle;

[0017] Figure 3 for Figure 1 Enlarged detail view of point B in the middle;

[0018] Figure 4 for Figure 1 Detailed magnified view of point C in the middle;

[0019] In the diagram, 10 is the valve body; 11 is the flow channel; 12 is the valve stem; 13 is the valve seat; 14 is the valve core; 15 is the pressure channel; 16 is the balance channel; 17 is the buoyancy chamber; 18 is the opening; 19 is the float; 20 is the first spring; 21 is the pressure ball; 22 is the first sealing sleeve; 23 is the abutment part; 24 is the second sealing sleeve; 25 is the barb part; 26 is the water inlet channel; 27 is the second spring; 28 is the sealing ball; 29 is the moving chamber; 30 is the reinforcing ring; 31 is the third spring; 32 is the reinforcing plate; 33 is the pressure sleeve; 34 is the sealing component; 35 is the third sealing sleeve; 36 is the extrusion groove; 37 is the fourth sealing sleeve; 38 is the extrusion ball; 39 is the snap-fit ​​groove; and 40 is the support sleeve. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings.

[0021] It should be noted that all uses of "first" and "second" in the embodiments of the present invention are for the purpose of distinguishing two entities or parameters with the same name but different names. It is clear that "first" and "second" are only for the convenience of expression and should not be construed as limiting the embodiments of the present invention. Subsequent embodiments will not explain this in detail.

[0022] The directional and positional terms used in this invention, such as "up," "down," "front," "back," "left," "right," "inner," "outer," "top," "bottom," and "side," are merely for reference to the accompanying drawings. Therefore, the directional and positional terms used are for illustrating and understanding this invention, and not for limiting the scope of protection of this invention.

[0023] like Figure 1-3 As shown, this is an embodiment of a check valve for maintaining pressure balance according to the present invention. It includes a valve body 10, which contains a flow channel 11, a valve stem 12, and a valve seat 13. A valve core 14 is located at the bottom of the valve stem 12. The valve core 14 moves up and down within the flow channel 11 via the valve stem 12 and abuts against the valve seat 13 to cut off the flow channel 11. A pressure channel 15 is located within the valve core 14, extending to both ends and connecting to the top of the valve core 14 and the outside. A balance channel 16 is connected to the bottom of the pressure channel 15, and a buoyancy chamber 17 is connected to the bottom of the balance channel 16. A float 19, which abuts against the inner wall, is located within the buoyancy chamber 17. A first spring 20 is located at the top of the float 19. The first spring 20 extends into the balance channel 16 and is connected to a pressure ball 21 that is in contact with both inner walls of the balance channel 16. A valve block is set to cooperate with the pressure ball 21. When it is necessary to cut off the flow and close the valve, the float 19 floats upward under pressure, which drives the pressure ball 21 to move upward. At the same time, excessive pressure in the pressure channel 15 in the flow channel 11 applies pressure to the top of the pressure ball 21. The first spring 20 at the bottom of the pressure ball 21 is compressed or stretched by the combined action of pressure and buoyancy of the float 19 to balance the pressure on the valve core 14 and transfer the pressure to the middle of the valve core 14. This prevents the valve core 14 from being unstable in sealing with the valve seat 13 due to pressure imbalance on both sides, improves the sealing effect, and avoids leakage caused by untimely pressure relief.

[0024] A first sealing sleeve 22 is fixedly provided at the bottom of the valve core 14, and an opening 18 is provided at the bottom of the buoyancy chamber 17. The first sealing sleeve 22 is provided with an abutment portion 23 that can selectively abut against the bottom of the float 19. The abutment portion 23 is used to prevent the float 19 from detaching from the valve core 14. A second sealing sleeve 24 is provided on the valve seat 13. The second sealing sleeve 24 includes a barb portion 25 that engages with the valve seat 13. The barb portion 25 is composed of several barbs, which can enhance the engagement effect between the second sealing sleeve 24 and the valve seat 13, making the fixation of the second sealing sleeve 24 more stable. The inner wall of the second sealing sleeve 24 is connected to an L-shaped water inlet channel 26 extending to the top. A second spring 27 is fixed inside the water inlet channel 26. The top of the second spring 27 is provided with a buoyant sealing ball 28 that abuts against the inner wall of the water inlet channel 26. When the valve core 14 and the valve seat 13 are sealed, water enters the water inlet channel 26. The sealing ball 28 moves upward under the dynamic buoyancy and abuts against the second sealing sleeve 24 at the bottom of the valve core 14, thereby enhancing the sealing effect.

[0025] like Figure 1-4 As shown, this is an embodiment of a check valve for maintaining pressure balance according to the present invention. It includes a valve body 10, which contains a flow channel 11, a valve stem 12, and a valve seat 13. A valve core 14 is located at the bottom of the valve stem 12. The valve core 14 moves up and down within the flow channel 11 via the valve stem 12 and abuts against the valve seat 13 to cut off the flow channel 11. A pressure channel 15 is located within the valve core 14, extending to both ends and connecting to the top of the valve core 14 and the outside. A balance channel 16 is connected to the bottom of the pressure channel 15, and a buoyancy chamber 17 is connected to the bottom of the balance channel 16. A float 19, which abuts against the inner wall, is located within the buoyancy chamber 17. A first spring 20 is located at the top of the float 19. The first spring 20 extends into the balance channel 16 and is connected to a pressure ball 21 that is in contact with both inner walls of the balance channel 16. A valve block is set to cooperate with the pressure ball 21. When it is necessary to cut off the flow and close the valve, the float 19 floats upward under pressure, which drives the pressure ball 21 to move upward. At the same time, excessive pressure in the pressure channel 15 in the flow channel 11 applies pressure to the top of the pressure ball 21. The first spring 20 at the bottom of the pressure ball 21 is compressed or stretched by the combined action of pressure and buoyancy of the float 19 to balance the pressure on the valve core 14 and transfer the pressure to the middle of the valve core 14. This prevents the valve core 14 from being unstable in sealing with the valve seat 13 due to pressure imbalance on both sides, improves the sealing effect, and avoids leakage caused by untimely pressure relief.

[0026] The difference between this embodiment and the above embodiments is that, see [link to previous embodiment]. Figure 1-4The valve body 10 has a movable cavity 29 surrounding the valve stem 12. The outer wall of the valve stem 12 has a reinforcing ring 30 located in the movable cavity 29. A third spring 31 is fixed to the bottom of the reinforcing ring 30. A reinforcing plate 32 is provided at the bottom of the third spring 31. A pressure sleeve 33 is provided on the valve stem 12, which can selectively abut against the reinforcing plate 32. A sealing component 34 is provided at the bottom of the pressure sleeve 33, which can deform towards the central axis of the valve stem 12. When the valve stem 12 moves up and down, it drives the reinforcing ring 30 to move together. The reinforcing ring 30 drives the reinforcing plate 32 to move. Under the elastic force of the third spring 31, the reinforcing plate 32 abuts against the pressure sleeve 33, applying force to the pressure sleeve 33. The pressure sleeve 33 transmits pressure to the sealing component 34, causing the sealing component 34 to deform and abut tightly against the outer wall of the valve stem 12, preventing water from entering. The sealing component 34 includes a third sealing sleeve 35 fixed to the bottom of the moving cavity 29. The third sealing ring is provided with a compression groove 36, and a fourth sealing sleeve 37 is provided inside the compression groove 36. A compression ball 38 is provided between the third sealing sleeve 35 and the fourth sealing sleeve 37. When the third sealing sleeve 35 is subjected to pressure from the pressure sleeve 33, the compression groove 36 will be compressed and deformed. The inner wall of the compression groove 36 will be pushed towards the compression ball 38. With the support of the fourth sealing sleeve 37, the compression ball 38 will exert force towards the valve stem 12, making the connection between the third sealing sleeve 35 and the valve stem 12 tighter, preventing water from entering the moving cavity 29 and improving the sealing performance.

[0027] The fourth sealing sleeve 37 has an inwardly recessed snap-fit ​​groove 39 at its top. The compression ball 38 abuts against the snap-fit ​​groove 39, providing stable support for the compression ball 38 and preventing the reaction force of the compression ball 38 from moving outward and failing to achieve the compression sealing effect. The pressure sleeve 33 has an inclined top, and the inner wall of the pressure sleeve 33 has a support sleeve 40 that is fitted onto the outside of the valve stem 12 to support the pressure sleeve 33 and prevent excessive deformation that would affect the sealing effect.

[0028] The above description discloses only preferred embodiments of the present invention and should not be construed as limiting the scope of the present invention. Therefore, equivalent variations made in accordance with the claims of the present invention are still within the scope of the present invention.

[0029] While the invention has been described with reference to several specific embodiments, it should be understood that the invention is not limited to the disclosed specific embodiments. The invention is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A check valve for maintaining pressure balance, comprising a valve body, wherein the valve body has a flow channel, a valve stem, and a valve seat, and a valve core is provided at the bottom of the valve stem, the valve core moving up and down within the flow channel via the valve stem to abut against the valve seat, for cutting off the communication of the flow channel, characterized in that: The valve core has a pressure channel extending to both ends, connecting to the top of the valve core and the outside. A balance channel connects to the bottom of the pressure channel, and a buoyancy chamber connects to the bottom of the balance channel. A float abuts against the inner wall of the buoyancy chamber, and a first spring is located on the top of the float. The first spring extends into the balance channel and connects to a pressure ball that abuts against both sides of the inner wall of the balance channel. The valve body has a moving cavity surrounding the valve stem. A reinforcing ring is located within the moving cavity on the outer wall of the valve stem. A third spring is fixed to the bottom of the reinforcing ring, and a reinforcing plate is located at the bottom of the third spring. A pressure sleeve is fitted over the valve stem, selectively abutting against the reinforcing plate. A sealing component deformable towards the central axis of the valve stem is located at the bottom of the pressure sleeve. The sealing component includes a third sealing sleeve fixed to the bottom of the moving cavity. A compression groove is provided on the third sealing ring, and a fourth sealing sleeve is located within the compression groove. A compression ball is located between the third and fourth sealing sleeves. A recessed snap-fit ​​groove is located on the top of the fourth sealing sleeve, and the compression ball abuts against the snap-fit ​​groove.

2. The check valve for maintaining pressure balance as described in claim 1, characterized in that: The valve core is fixedly provided with a first sealing sleeve at the bottom, the buoyancy chamber is provided with an opening at the bottom, and the first sealing sleeve is provided with an abutment part that can selectively abut against the bottom of the float.

3. The check valve for maintaining pressure balance as described in claim 1, characterized in that: The valve seat is provided with a second sealing sleeve, the second sealing sleeve including a barbed part that engages with the valve seat, the barbed part being composed of a plurality of barbs.

4. The check valve for maintaining pressure balance as described in claim 3, characterized in that: The inner wall of the second sealing sleeve is connected to an L-shaped water inlet channel extending to the top. A second spring is fixed inside the water inlet channel, and a buoyant sealing ball is provided at the top of the second spring, which abuts against the inner wall of the water inlet channel.

5. The check valve for maintaining pressure balance as described in claim 1, characterized in that: The top of the pressure sleeve is inclined, and the inner wall of the pressure sleeve is provided with a support sleeve that is fitted onto the outside of the valve stem.

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