Horizontal flow sealing valve for chemical production

Abstract

The utility model relates to an advection sealing valve for chemical production, which comprises a valve body, two axial ends of the valve body are fixedly connected with valve covers, the valve body is provided with an input port and an output port, a valve seat dividing an inner cavity of the valve body into two valve chambers is fixedly arranged in the valve body, the valve seat is provided with a valve port, and the input port and the output port are respectively communicated with the two valve chambers. The valve further comprises a sealing piece located in the valve chamber, the sealing piece comprises a valve rod extending in the axial direction and a valve head set in sealing fit with the valve seat, a first counter bore and a second counter bore are sequentially inwards formed in the end, facing the valve seat, of the valve head set, the diameter of the first counter bore is smaller than that of the second counter bore, and a flat pressing hole communicated with the second counter bore is formed in the side wall of the valve head set. A balance valve head in sealing fit with the first counter bore is arranged in the second counter bore, one end of the valve rod is fixedly connected with the balance valve head, and the other end of the valve rod penetrates through the valve deck and extends to the outside. Wear parts can be replaced conveniently, and opening and closing of the valve head set are smoother and labor-saving by balancing internal pressure and external pressure of the valve head set.

Description

Technical Field

[0001] This utility model relates to the field of gate valve technology, specifically to a horizontal flow sealing valve for chemical production. Background Technology

[0002] In chemical production, some chemical pipelines transport toxic, harmful, flammable, and explosive gases, requiring valves on these pipelines to have excellent sealing performance. Patent CN105387220A discloses a multi-purpose gate valve with a replaceable sealing seat, comprising a valve body, valve core, and valve cover, with the valve cover detachably connected to the valve body. The valve body has inlet and outlet ports on both sides. The valve core includes a sealing unit comprising a valve stem extending from the valve cover into the hollow valve body cavity, and a valve head assembly. A hollow, replaceable sealing seat is correspondingly provided with the valve head assembly. The outer wall of the replaceable sealing seat seals against the inner wall of the hollow valve body, and the end face of the replaceable sealing seat seals against the end face of the valve head assembly. A detection hole communicating with the inner cavity of the sealing seat is provided on the outer wall of the valve body. An annular groove communicating with the detection hole is provided on the inner wall of the valve body or the outer wall of the replaceable sealing seat. One end of the replaceable sealing seat has a check ring with a positioning pin. Different combinations are available as needed: such as a stop valve on one end and a regulating valve on the other, a check valve on top and a stop valve on the bottom, etc. It has the advantages of replaceable sealing seats, low cost, and good sealing effect.

[0003] This patent primarily addresses the drawback of the inconvenience of replacing the valve body and seat, but the valve head assembly and stem remain an integral structure, requiring replacement of the entire assembly once worn. Furthermore, when media enters the valve body, the pressure at the end of the valve head assembly closer to the seat is lower than the pressure at the end farther from the seat, creating a pressure difference between the inside and outside of the valve head assembly. This makes opening and closing the valve more difficult and inconvenient. Utility Model Content

[0004] This utility model addresses the shortcomings of existing technologies by providing a horizontal flow sealing valve for chemical production. It offers superior sealing performance, facilitates the replacement of worn parts, and allows fluid to flow horizontally to the outlet when the valve is open, reducing flow resistance and kinetic energy loss. Furthermore, by balancing the internal and external pressures of the valve head assembly, the valve head assembly can be opened and closed more smoothly and effortlessly.

[0005] This utility model is achieved through the following technical solution: a horizontal flow sealing valve for chemical production, comprising a valve body, an inlet and an outlet on the valve body, a valve seat fixedly disposed within the valve body dividing the valve body cavity into two valve chambers, the inlet and outlet communicating with the two valve chambers respectively, a sealing element provided within the valve chamber for sealing cooperation with the valve seat, the sealing element comprising a valve stem and a valve head assembly, the valve head assembly having a first countersunk hole and a second countersunk hole sequentially formed inward at one end facing the valve seat, a pressure-balancing hole communicating with the second countersunk hole being formed on the side wall of the valve head assembly, a balance valve head for sealing cooperation with the first countersunk hole being installed in the second countersunk hole, one end of the valve stem being connected to the balance valve head, and the other end of the valve stem extending to the outside of the valve body.

[0006] In this design, the valve head assembly has a first and a second countersunk hole connected to the valve port. The valve stem drives the movement of the balance valve head, which in turn drives the valve head assembly, thus opening and closing the valve port. When the balance valve head opens the first countersunk hole, the high-pressure fluid outside the valve head assembly enters the first countersunk hole through the equalizing hole, thereby balancing the pressure at both ends of the valve head assembly. This makes opening the valve port smoother and less strenuous. When the balance valve head closes and seals the first countersunk hole, the water inside the valve head assembly is discharged to the outside through the equalizing hole. This allows the balance valve head to more smoothly close the first countersunk hole and simultaneously close the sealing valve head, achieving a seal on the valve port. Closing the valve head assembly is now smoother and less strenuous.

[0007] As an optimization, the valve head assembly includes a sealing valve head, a bushing, a cover, and a balancing valve head. One end of the sealing valve head is opposite to the valve seat. The bushing is fitted onto the other end of the sealing valve head and is detachably fixed to the sealing valve head. The end of the cover away from the sealing valve head is detachably fixed to the bushing. The inner cavity of the sealing valve head is the first countersunk hole of the valve head assembly, and the inner cavity of the bushing is the second countersunk hole of the valve head assembly.

[0008] As an optimization, the valve seat has a circular ring structure, with its outer wall and the inner wall of the valve body fixedly connected. One end of the valve body is open to form the inlet, while the other end is closed. An outlet is located on one side of the outer wall of the valve body. A sealing element is located in the valve chamber near the closed end of the valve body, and the valve stem of the sealing element extends through the closed end of the valve body to the outside. This optimized valve seat has a circular ring structure and a larger diameter, making it suitable for conveying large flow rates of media.

[0009] As an optimization, the valve body has an open end forming the input port and a closed end. An output port is located on each side of the outer wall of the valve body. A sealing element is located in the valve chamber on the side of the valve seat away from the closed end of the valve body, and the valve stem of the sealing element extends through the closed end of the valve body to the outside. This optimized design features a vertically distributed input and output port, suitable for connecting to vertical pipelines. The two output ports on the valve body enable splitting the flow.

[0010] As an optimization, the valve body is sealed at both ends, with an output port and an input port on each side of the outer wall of the valve body, concentrically arranged. A sealing element is located in one of the valve chambers, with its stem extending through one end of the valve body to the outside. This optimized design features parallel distribution of the input and output ports, suitable for connecting to horizontal flow pipelines.

[0011] As an optimization, the valve seat includes an annular first valve core and an annular first partition plate. The outer wall of the first partition plate is sealed and fixedly connected to the inner wall of the valve body, and the outer wall of the first valve core is sealed and fixedly connected to the inner wall of the first partition plate. This optimized valve seat connects two valve chambers through the first valve core, has a smaller diameter, and is suitable for conveying small flow rates of media.

[0012] As an optimization, the valve body is sealed at both ends, with an output port and an input port on each side of the outer wall of the valve body, concentrically arranged. Both valve chambers contain the aforementioned sealing element, and the valve stems of the two sealing elements extend to the outside through the same end of the valve body or through both ends of the valve body. This optimized design, with sealing elements in both valve chambers, improves the sealing effect of the valve by sealing both sides of the valve seat.

[0013] As an optimization, the valve seat includes an annular second valve core. An annular second partition plate is fixedly fitted onto the outer wall of the second valve core. The outer diameter of the second partition plate is smaller than the inner diameter of the valve body. Two vertically extending vertical partition plates are symmetrically fixed to the outer wall of the second partition plate. The side of the two vertical partition plates away from the second partition plate is fixed to the inner wall of the valve body. The two vertical partition plates are located between the inlet and the outlet. A semi-annular upper partition plate is fixedly fitted to the upper part of the two vertical partition plates near the outlet. The outer wall of the upper partition plate is fixed to the inner wall of the valve body. A semi-annular first side partition is fixedly fitted to the inner wall of the upper partition plate. The bottom of the first side partition is fixed to the second partition plate. Both ends of the first side partition are fixed to the two vertical partition plates. A semi-annular lower partition plate is fixedly fitted to the lower end of the two vertical partition plates near the inlet. The outer wall of the lower partition plate is fixed to the inner wall of the valve body. A semi-annular second side partition is fixedly fitted to the inner wall of the lower partition plate. The top of the second side partition is fixed to the second partition plate. Both ends of the second side partition are fixed to the two vertical partition plates.

[0014] As an optimization, a vent pipe is installed on the second valve core. One end of the vent pipe is connected to the inner cavity of the second valve core, and the other end is connected to the outside of the valve body. A switch valve is installed on the vent pipe. This optimized solution introduces high-pressure gas into the second valve core through the vent pipe to form an airtight structure. Since the pressure of the high-pressure gas is greater than the pressure of the gas being transported, it can prevent the transported gas from leaking into the second valve core, thereby improving the sealing effect.

[0015] As an optimization, the top of the second valve core has an annular vent groove facing downwards. The valve seat has an inlet and an outlet port communicating with the vent groove. Both the inlet and outlet ports are connected to the outside of the valve body, and a switching valve is installed at the end of each port located outside the valve body. This optimized design allows high-pressure gas to be introduced into the vent groove of the second valve core through the inlet port, thereby forming an airtight seal between the valve head assembly and the upper surface of the second valve core. This prevents the delivered gas from leaking into the second valve core, improving the sealing effect.

[0016] The beneficial effects of this utility model are as follows: A first countersunk hole and a second countersunk hole, communicating with the valve port, are provided within the valve head assembly. The valve stem drives the movement of the balance valve head, which in turn drives the movement of the sealing valve head, thus achieving the opening and closing of the valve port. When the balance valve head opens the first countersunk hole, the conveying medium outside the valve head assembly enters the first countersunk hole through the pressure equalization hole, thereby balancing the pressure at both ends of the valve head assembly, making the valve port opening smoother and less strenuous. When the balance valve head seals the first countersunk hole, the conveying medium inside the valve head assembly is squeezed out to the outside of the valve head assembly through the pressure equalization hole, allowing the balance valve head to more smoothly close the first countersunk hole and simultaneously close the sealing valve head, achieving a seal on the valve port, and making closure smoother and less strenuous.

[0017] The valve can be sealed with one or two seals depending on the application, making it flexible and more convenient to use;

[0018] The sealing valve head, bushing, and cover are connected by bolts to form a valve head assembly, which is easy to disassemble and replace.

[0019] High-pressure gas can be introduced between the valve seat and the seal to form a gas seal structure, which further improves the sealing effect of the valve. Attached Figure Description

[0020] Figure 1 This is a cross-sectional view of Example 1;

[0021] Figure 2 This is a sectional view of the seal;

[0022] Figure 3 This is a cross-sectional view of Example 2;

[0023] Figure 4 Cross-sectional view of Example 3

[0024] Figure 5 This is a schematic diagram of the valve seat structure in Example 3;

[0025] Figure 6 This is a cross-sectional view of Example 4;

[0026] Figure 7 This is a schematic diagram of the valve seat structure in Example 4;

[0027] Figure 8 This is a cross-sectional view of Example 6;

[0028] Figure 9 This is a cross-sectional view of Example 7;

[0029] Figure 10 This is a cross-sectional view of Example 8;

[0030] Figure 11 Top views of the internal structure of the valve body in Examples 7 and 8;

[0031] Figure 12 This is a schematic diagram of the valve seat structure in Example 5;

[0032] Figure 13 This is a bottom view of the valve seat in Example 5;

[0033] As shown in the figure:

[0034] 1. Valve body; 2. Valve cover; 3. Valve seat; 31a. Second valve core; 32a. Second partition plate; 33a. Vertical partition plate; 34a. Upper partition plate; 35a. Lower partition plate; 36a. First side partition; 37a. Second side partition; 31b. First valve core; 32b. First partition plate; 4. Valve head assembly; 41. Sealing valve head; 42. Bushing; 43. Cover; 44. First countersunk hole; 45. Second countersunk hole; 46. Pressure equalization hole; 5. Balance valve head; 6. Valve stem; 7. Inlet port; 8. Outlet port; 9. Through hole; 10. Reinforcing rib; 11. Valve chamber; 12. Vent groove; 13. Air inlet; 14. Air inlet pipe; 15. Exhaust port; 16. Exhaust pipe; 17. Switch valve; 18. Vent pipe. Detailed Implementation

[0035] To clearly illustrate the technical features of this solution, the following detailed implementation method will be used to explain the solution.

[0036] Example 1:

[0037] like Figure 1 , 2 As shown, a horizontal flow sealing valve for chemical production includes a valve body 1, an inlet 7 and an outlet 8 on the valve body 1, and a valve seat 3 fixed inside the valve body 1, which divides the inner cavity of the valve body 1 into two valve chambers 11. The valve seat 3 has a valve port, and the inlet 7 and the outlet 8 are respectively connected to the two valve chambers 11.

[0038] Preferably, a reinforcing rib 10 is fixedly connected to the valve port of the valve seat 3. The reinforcing rib is in the form of a grid and is used to strengthen the valve port.

[0039] The valve chamber 11 is equipped with a sealing element that seals with the valve seat 3. The sealing element includes a valve stem 6 extending axially along the valve body 1 and a valve head assembly 4. The valve head assembly 4 seals with the valve seat 3. At the end of the valve head assembly 4 facing the valve seat 3, a first countersunk hole 44 and a second countersunk hole 45 are sequentially formed inwards. The diameter of the first countersunk hole 44 is smaller than that of the second countersunk hole 45. A pressure-balancing hole 46 communicating with the second countersunk hole 45 is formed on the side wall of the valve head assembly 4. A balance valve head 5, which seals with the first countersunk hole 44, is installed in the second countersunk hole 45. One end of the valve stem 6 is connected to the balance valve head 5, and the other end of the valve stem 6 extends to the outside of the valve body 1. In this embodiment, the valve stem 6 is slidably connected to the valve body 1, and a sealing ring is provided between the valve stem 6 and the valve body 1 to achieve a sealed sliding connection and ensure sealing performance. The up-and-down sliding of the valve stem 6 drives the up-and-down movement of the balance valve head 5.

[0040] The valve body 1, valve seat 3, valve head assembly 4, balance valve head 5, and valve stem 6 are concentrically arranged, thereby making the valve port, first countersunk hole 44, and second countersunk hole 45 of the valve seat 3 coaxial, realizing mutual communication between the valve port, the first countersunk hole, and the second countersunk hole. The outer diameter of the balance valve head 5 is adapted to the diameter of the second countersunk hole 45. Since the diameter of the first countersunk hole 44 is smaller than the diameter of the second countersunk hole 45, the balance valve head 5 slides in the second countersunk hole 45 and presses against the first countersunk hole 44 to achieve a seal on the first countersunk hole 44.

[0041] Specifically, the valve head assembly 4 includes a sealing valve head 41, a bushing, a cover 43, and a balancing valve head 5. One end of the sealing valve head 41 is opposite to the valve seat 3, and the bushing 42 is fitted onto the other end of the sealing valve head 41 and fixed to the sealing valve head 41 by bolts. The end of the cover 43 away from the sealing valve head 41 is fixed to the bushing 42 by bolts. The sealing valve head 41 is a hollow sleeve structure, and the inner cavity of the sealing valve head 41 is the first countersunk hole 44 of the valve head assembly 4. The inner cavity of the bushing 42 is the second countersunk hole 45 of the valve head assembly. Two equalizing holes 46 are symmetrically opened on the side wall of the bushing 42. The equalizing holes 46 are perpendicular to the second countersunk hole 45. The movable sealing cover is movably disposed in the bushing 42. When the balancing valve head 5 seals the first countersunk hole 44, it also seals the two equalizing holes 46. The sealing valve head 41, bushing 42, and cover 43 are connected by bolts to form the valve head assembly, which is convenient for disassembly and replacement of parts.

[0042] The valve stem 6 drives the balance valve head 5 to open and close the first countersunk hole 44. When the balance valve head 5 seals the first countersunk hole 44, the movement of the balance valve head forces the medium inside the valve head assembly 4 to the outside of the valve head assembly 4 through the equalizing pressure hole 46. This allows the balance valve head 5 to more smoothly close the first countersunk hole 44 and drive the sealing valve head 41 to operate, enabling the valve head assembly to successfully seal the valve port. When the balance valve head 5 opens the first countersunk hole 44, the medium outside the valve head assembly 4 enters the interior through the equalizing pressure hole 46, thereby balancing the pressure inside and outside the valve head assembly 4. This makes opening the valve port smoother and less strenuous.

[0043] In this embodiment, the valve seat 3 has a circular structure, and the outer wall of the valve seat 3 is fixedly connected to the inner wall of the valve body 1.

[0044] Specifically, in this embodiment, the inner diameter of the valve seat 3 is the valve port of the valve seat 3, and the outer diameter of the sealing valve head 41 is adapted to the outer diameter of the annular valve seat 3, so that the sealing valve head 41 can press on the valve seat 3 to seal the valve port.

[0045] In this embodiment, the valve body 1 has an open end forming the input port 7, and the other end is closed. An output port 8 is provided on one side of the outer wall of the valve body 1. The valve seat 3 is lower than the output port 8. The valve chamber 11 on the side of the valve seat 3 near the closed end of the valve body is provided with the sealing element. The valve stem 6 of the sealing element extends through the closed end of the valve body to the outside.

[0046] Specifically, one end of the valve body 1 is bolted to a valve cover 2 to form a closed end of the valve body. One end of the valve stem 6 passes through the cover 43 and is fixed to the balance valve head 5, while the other end passes through the valve cover 2 and extends to the outside. A sealing ring is also provided between the valve stem 6 and the cover 43 to achieve a sealed sliding connection between the two and improve the sealing performance.

[0047] A method of using a horizontal flow sealing valve for chemical production includes the following steps: When the valve is opened, the valve stem 6 slides to drive the balance valve head 5 to slide away from the valve seat 3. The medium outside the valve head assembly 4 enters the valve head assembly 4 through the pressure equalization hole 46, so that the internal and external pressures are connected and balanced. As the valve stem 6 continues to slide, the balance valve head 5 drives the valve head assembly 4 to slide away from the valve seat 3, thus opening the valve port.

[0048] When the valve is closed, the valve stem 6 pushes the balance valve head 5 to slide closer to the valve seat 3, and the medium inside the valve head assembly 4 is discharged to the outside through the pressure equalization hole 46, so that the balance valve head 5 presses the first countersunk hole 44, thereby sealing the first countersunk hole. As the valve stem 6 continues to push the balance valve head 5 to continue to move, the valve head assembly 4 can be pushed closer to the valve seat 3 to press the valve seat 3, thus separating the two valve chambers 11 and closing the valve port.

[0049] Example 2:

[0050] like Figure 3 As shown, the difference between this embodiment and Embodiment 1 is that: in this embodiment, each side of the outer wall of the valve body 1 is provided with an output port 8, and the valve chamber 11 on the side of the valve seat 3 away from the closed end of the valve body is provided with the sealing element, and the valve stem 6 of the sealing element extends through the closed end of the valve body to the outside. This embodiment achieves flow diversion output by providing two output ports 8 on the valve body.

[0051] In this embodiment, the valve seat 3 includes an annular first valve core 31b and an annular first partition plate 32b. The outer wall of the first partition plate 32b is sealed and fixedly connected to the inner wall of the valve body 1, and the outer wall of the first valve core 31b and the inner wall of the first partition plate 32b are sealed and fixedly connected. In this embodiment, the valve seat 3 is directly fixedly connected to the inner wall of the valve body 1 through the first partition plate 32b, thereby isolating the inner cavity of the valve body 1 into two valve chambers 11, which simplifies the structure and facilitates processing.

[0052] The inner cavity of the first valve core 31b is the valve port of the valve seat 3. The first valve core 31b is concentrically arranged with the valve body 1. The outer diameter of the sealing valve head 41 is adapted to the outer diameter of the first valve core 31b, so that the sealing valve head 41 can press on the first valve core 31b to seal the valve port.

[0053] In this embodiment, the valve head assembly 4 is a blind cover. One end of the valve stem 6 of the sealing element extends to the outside through the valve cover 2, and the other end of the valve stem 6 passes through the valve port of the valve seat 3 and the first countersunk hole 44 in sequence, thereby being fixedly connected to the balance valve head 5 in the second countersunk hole 45.

[0054] Example 3:

[0055] like Figure 4 , 5 As shown, the difference between this embodiment and Embodiment 2 is that the valve body 1 in this embodiment is closed at both ends. An output port 8 and an input port 7 are respectively provided on both sides of the outer wall of the valve body 1, and the output port 8 and the input port 7 are concentrically arranged. The sealing element is provided in one of the valve chambers 11, and the valve stem 6 of the sealing element extends to the outside through one end of the valve body 1.

[0056] Specifically, in this embodiment, valve covers 2 are bolted to both ends of the valve body 1. The sealing element is installed in one of the valve chambers. One end of the valve stem 6 of the sealing element extends to the outside through the valve cover 2 on the same side, and the other end of the valve stem 6 passes through the cover 43 and is fixed to the balance valve head 5.

[0057] To achieve concentric alignment of the output port 8 and the input port 7, the axis of the valve body 1 in this embodiment forms an angle with the axes of the input port 7 and the output port 8. After installation, the valve body 1 is tilted, thereby keeping the input port 7 and the output port 8 horizontal. When the valve is opened, the fluid flows horizontally to the output port 8, reducing flow resistance and minimizing kinetic energy loss. During maintenance, the lower valve cover 2 can be removed to inspect the sealing surface and remove accumulated dust.

[0058] Example 4:

[0059] like Figure 6 , 7 As shown, the difference between this embodiment and embodiment 3 is that the valve body 1 in this embodiment is vertically arranged with the inlet 7 and the outlet 8.

[0060] Furthermore, the valve seat 3 described in this embodiment includes an annular second valve core 31a. An annular second partition plate 32a is sleeved and fixedly connected to the outer wall of the second valve core 31a. The outer diameter of the second partition plate 32a is smaller than the inner diameter of the valve body 1. Two vertically extending partition plates 33a are symmetrically fixed to the outer wall of the second partition plate 32a. The side of the two partition plates away from the second partition plate is fixedly connected to the inner wall of the valve body 1. The two partition plates 33a are located between the inlet 7 and the outlet 8. A semi-annular upper partition plate 34a is fixedly connected to the upper end of the two partition plates 33a and the side closer to the outlet 8. The outer wall of the upper partition plate 34a is fixed to the valve body. 1. The inner wall is fixedly connected. The inner wall of the upper partition 34a is fixedly connected to a semi-annular first side partition 36a. The bottom of the first side partition 36a is fixedly connected to the second partition plate 32a. The two ends of the first side partition 36a are fixedly connected to two vertical partition plates 33a. The lower end of the two vertical partition plates 33a and the side near the input port 7 are fixedly connected to a semi-annular lower partition plate 35a. The outer wall of the lower partition plate 35a is fixedly connected to the inner wall of the valve body 1. The inner wall of the lower partition plate 35a is fixedly connected to a semi-annular second side partition 37a. The top of the second side partition 37a is fixedly connected to the second partition plate 32a. The two ends of the second side partition are fixedly connected to the two vertical partition plates 33a.

[0061] In this embodiment, the inner cavity of the second valve core 31a is the valve port of the valve seat 3. The outer diameter of the sealing valve head 41 is adapted to the outer diameter of the second valve core 31a, so that the sealing valve head 41 can press against the second valve core 31a, thereby sealing the valve port. The second valve core 31a is concentrically arranged with the valve body 1, and the central axis of the second valve core 31a is perpendicular to the central axis of the inlet 7 and the outlet 8. In this embodiment, the valve seat 3 has a second partition plate 32a smaller than the inner diameter of the valve body 1, thus forming an annular gap between the second partition plate 32a and the inner wall of the valve body 1. The second partition plate 32a, through two vertical partition plates 33a, moves the upper partition plate 34a upward to avoid the outlet 8, and cooperates with the first side partition plate 36a to seal half of the annular gap, and the lower partition plate 35a moves downward to avoid the inlet 7, and cooperates with the second side partition plate 37a to seal the other half of the annular gap, thereby dividing the inner cavity of the valve body 1 into two valve chambers 11, realizing the communication between the inlet 7 and the outlet 8 and the two valve chambers respectively. Provided that the inlet 7 and outlet 8 need to be kept horizontally opposite each other, the valve body 1 can be set vertically to achieve horizontal flow of fluid, reduce flow resistance, and reduce kinetic energy loss.

[0062] Example 5:

[0063] like Figure 12 , 13 As shown, the difference between this embodiment and embodiment 4 is that the valve seat 3 in this embodiment does not have a lower partition 35a, and the second side partition 37a of the valve seat forms a dividing surface with the two vertical partitions 33a. The lower end surfaces of the second side partition 37a and the two vertical partitions 33a are in sealing contact with the valve cover 2 at the bottom of the valve body 1, thereby dividing the valve body into two valve chambers 11.

[0064] In this embodiment, the valve body is formed into two valve chambers 11 by setting the split surface flush with the valve cover 2 at the bottom of the valve body 1. Since this embodiment does not have a lower partition 35a, both valve chambers 11 are connected to the valve cover 2 at the bottom of the valve body 1. With this structure, opening the valve cover 2 at the bottom of the valve body 1 can remove the accumulated dust from both valve chambers 11. In contrast, in embodiment 4, opening the bottom valve cover can only remove the accumulated dust from the lower valve chamber. Therefore, this embodiment is more convenient to use.

[0065] Example 6:

[0066] like Figure 8 As shown, the difference between this embodiment and embodiment 4 is that: in this embodiment, the top of the second valve core 31a is provided with an annular vent groove 12 facing downwards. The valve seat 3 is provided with an air inlet 13 and an air outlet 15 communicating with the vent groove 12. Both the air inlet 13 and the air outlet 15 are connected to the outside of the valve body 1, and a switch valve 17 is provided at the end of the air inlet 13 and the air outlet 15 located outside the valve body 1.

[0067] Specifically, the outer port of the air inlet 13 is connected to the air inlet pipe 14, the outer port of the exhaust port 15 is connected to the exhaust pipe 16, and the switch valve 17 is installed on the air inlet pipe 14 and the exhaust pipe 16.

[0068] In this embodiment, the air inlet pipe 14 is connected to an external air source. The valve stem 6 pushes the valve head assembly 4 to seal against the second valve core 31a of the valve seat 3. High-pressure gas is introduced into the venting groove 12 through the air inlet pipe 14. After the high-pressure gas fills the venting groove 12, an airtight surface is formed between the valve head assembly 4 and the second valve core 31a. Since the pressure of the high-pressure gas is greater than the pressure of the transported medium, leakage of the medium from the gap can be prevented, thus improving the valve's sealing performance.

[0069] Example 7:

[0070] like Figure 9 , 11 As shown, the difference between this embodiment and embodiment 4 is that: in this embodiment, both valve chambers 11 are provided with the sealing element, and the valve stems 6 of the two sealing elements extend to the outside through the same end of the valve body 1.

[0071] Specifically, one end of the valve stem 6 of one of the seals passes through the cover 43 and is fixed to the outer wall of the balance valve head 5. The other end of the valve stem 6 extends to the outside through the valve cover 2 at the end of the valve chamber 11 where it is located. A through hole 9 is provided on the valve stem 6, and the through hole 9 passes through the valve stem 6 and the balance valve head 5 of the seal in sequence.

[0072] The valve stem 6 of the other sealing element is fixed at one end to the inner wall of the balance valve head, and the other end of the valve stem extends to the outside through the through hole 9, thus realizing that the two valve stems protrude from the same end of the valve body. In addition, a sealing ring is provided between the valve stem 6 and the through hole 9, and the two are slidably connected to improve the sealing performance.

[0073] In this embodiment, the valve stems 6 of the two seals are set on the same side, which reduces the overall volume of the valve, reduces space occupation, and facilitates personnel operation.

[0074] Preferably, in this embodiment, a vent pipe 18 is provided on the second valve core 31a. One end of the vent pipe 18 communicates with the inner cavity of the second valve core 31a, and the other end communicates with the outside of the valve body 1. A switch valve 17 is installed on the vent pipe. Specifically, the vent pipe 18 is perpendicular to the second valve core 31a. One end of the vent pipe passes through the outer wall of the second valve core 31a, thereby communicating with the inner cavity of the second valve core 31a, and the other end passes through the valve body, thereby communicating with the outside of the valve body 1.

[0075] In this embodiment, two sealing elements are used to seal the two sides of the valve seat 3, which greatly improves the sealing effect. After the sealing elements are sealed with the valve seat 3, high-pressure gas is filled into the inner cavity of the second valve core 31a through the vent pipe 18, so that the inner cavity of the second valve core 31a and the first countersunk hole 44 are filled with high-pressure gas to form an air seal, thereby improving the sealing effect.

[0076] Example 8:

[0077] like Figure 10 , 11 As shown, the difference between this embodiment and embodiment 7 is that in this embodiment, the valve stems 6 of the two seals extend to the outside through both ends of the valve body 1.

[0078] Specifically, in this embodiment, the two seals are symmetrically arranged with the valve seat 3 as the center. One end of the valve stem 6 of each of the two seals passes through its respective cover 43 and is fixed to the outer wall of the balance valve head 5. The other end of the valve stem 6 passes through the valve cover 2 at the end of its respective valve chamber 11 and extends to the outside.

[0079] Of course, the above description is not limited to the examples above. Technical features of this utility model not described can be implemented by or using existing technology, and will not be repeated here. The above embodiments and drawings are only used to illustrate the technical solution of this utility model and are not intended to limit this utility model. This utility model has been described in detail with reference to preferred embodiments. Those skilled in the art should understand that any changes, modifications, additions or substitutions made by those skilled in the art within the scope of this utility model do not depart from the spirit of this utility model and should also fall within the protection scope of the claims of this utility model.

Claims

1. A horizontal flow sealing valve for chemical production, comprising a valve body (1), an inlet (7) and an outlet (8) provided on the valve body, wherein a valve seat (3) is fixedly provided inside the valve body (1) to divide the inner cavity of the valve body (1) into two valve chambers (11), the inlet (7) and the outlet (8) are respectively connected to the two valve chambers (11), and a sealing element that seals with the valve seat is provided in the valve chamber (11), characterized in that: The sealing element includes a valve stem (6) and a valve head assembly (4). The valve head assembly (4) has a first countersunk hole (44) and a second countersunk hole (45) sequentially opened inward at one end facing the valve seat (3). A flat pressure hole (46) communicating with the second countersunk hole (45) is opened on the side wall of the valve head assembly (4). A balance valve head (5) that is sealed and matched with the first countersunk hole (44) is installed in the second countersunk hole (45). One end of the valve stem (6) is connected to the balance valve head (5), and the other end of the valve stem (6) extends to the outside of the valve body.

2. The horizontal flow sealing valve for chemical production according to claim 1, characterized in that: The valve head assembly (4) includes a sealing valve head (41), a bushing (42), a cover (43), and a balancing valve head (5). One end of the sealing valve head (41) is opposite to the valve seat (3). The bushing (42) is fitted on the other end of the sealing valve head (41) and bolted to the sealing valve head (41). The cover (43) is bolted to the end of the bushing (42) away from the sealing valve head (41). The inner cavity of the sealing valve head (41) is the first countersunk hole (44) of the valve head assembly, and the inner cavity of the bushing (42) is the second countersunk hole (45) of the valve head assembly.

3. The horizontal flow sealing valve for chemical production according to claim 2, characterized in that: The valve seat (3) has a circular structure. The outer wall of the valve seat (3) is fixed to the inner wall of the valve body (1). One end of the valve body (1) is open to form the input port (7), and the other end is closed. The output port (8) is provided on one side of the outer wall of the valve body (1). The valve chamber (11) near the closed end of the valve body is provided with the sealing element. The valve stem of the sealing element extends to the outside through the closed end of the valve body.

4. The horizontal flow sealing valve for chemical production according to claim 2, characterized in that: The valve body (1) has an open end to form the input port (7) and a closed end. The valve body (1) has an output port (8) on each side of its outer wall. The valve chamber (11) on the side of the valve seat away from the closed end of the valve body is provided with the sealing element. The valve stem of the sealing element extends through the closed end of the valve body to the outside.

5. The horizontal flow sealing valve for chemical production according to claim 2, characterized in that: The valve body (1) is closed at both ends. The valve body (1) has an output port (8) and an input port (7) on both sides of its outer wall. The output port and the input port are concentric. The sealing element is provided in one of the valve chambers (11). The valve stem of the sealing element extends to the outside through one end of the valve body.

6. The horizontal flow sealing valve for chemical production according to claim 4 or 5, characterized in that: The valve seat (3) includes an annular first valve core (31b) and an annular first partition plate (32b). The outer wall of the first partition plate is sealed and fixed to the inner wall of the valve body (1), and the outer wall of the first valve core (31b) and the inner wall of the first partition plate (32b) are sealed and fixed to each other.

7. The horizontal flow sealing valve for chemical production according to claim 2, characterized in that: The valve body (1) is closed at both ends. The valve body (1) has an output port (8) and an input port (7) on both sides of its outer wall. The output port and the input port are concentric. The two valve chambers (11) are equipped with the sealing element. The valve stems of the two sealing elements extend to the outside through the same end of the valve body (1) or through both ends of the valve body (1).

8. The horizontal flow sealing valve for chemical production according to claim 5 or 7, characterized in that: The valve seat (3) includes an annular second valve core (31a). An annular second partition plate (32a) is fitted and fixed to the outer wall of the second valve core (31a). The outer diameter of the second partition plate is smaller than the inner diameter of the valve body (1). Two vertically extending partition plates (33a) are symmetrically fixed to the outer wall of the second partition plate (32a). The side of the two partition plates (33a) away from the second partition plate is fixed to the inner wall of the valve body (1). The two partition plates (33a) are located between the inlet (7) and the outlet (8). A semi-annular upper partition plate (34a) is fixed to the upper end of the two partition plates (33a) near the outlet (8). The outer wall of the upper partition plate is fixed to the valve body (7). 1) The inner wall is fixedly connected. The upper partition (34a) has a semi-annular first side partition (36a) fixedly connected to the inner wall. The bottom of the first side partition (36a) is fixedly connected to the second partition plate (32a). The two ends of the first side partition (36a) are fixedly connected to the two vertical partitions (33a). The lower end of the two vertical partitions (33a) is fixedly connected to the side of the inlet (7) with a semi-annular lower partition (35a). The outer wall of the lower partition is fixedly connected to the inner wall of the valve body (1). The inner wall of the lower partition (35a) has a semi-annular second side partition (37a) fixedly connected to the inner wall. The top of the second side partition is fixedly connected to the second partition plate (32a). The two ends of the second side partition are fixedly connected to the two vertical partitions (33a).

9. The horizontal flow sealing valve for chemical production according to claim 8, characterized in that: The second valve core (31a) is provided with a vent pipe (18). One end of the vent pipe is connected to the inner cavity of the second valve core (31a), and the other end is connected to the outside of the valve body (1). A switch valve (17) is installed on the vent pipe.

10. The horizontal flow sealing valve for chemical production according to claim 8, characterized in that: The second valve core (31a) has an annular vent groove (12) at the top and the valve seat (3) has an air inlet (13) and an exhaust hole (15) that communicate with the vent groove (12). The air inlet and exhaust holes are both connected to the outside of the valve body. The end of the air inlet and exhaust holes located outside the valve body (1) is provided with a switch valve (17).

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