Y-shaped melt three-way valve

Abstract

The Y-shaped melt three-way valve comprises a heat preservation sleeve structure, a valve clack, a valve rod assembly, a manual device and a valve rod nut. The heat preservation sleeve structure is tightly attached to the exterior of the valve body so as to maintain the temperature of materials in the valve body. The valve body inlet pipeline and the two valve body outlet pipelines are correspondingly provided with a heating medium inlet and a heating medium outlet respectively, and the heating medium inlet and the heating medium outlet corresponding to each pipeline form mutually independent heating medium circulating channels through a heat preservation sleeve structure; a material flowing channel is formed in the valve body, the flowing direction of materials in the flowing channel is controlled by the valve clack, and the valve clack is located in the valve body. One end of the valve rod assembly is connected with the valve clack, the other end of the valve rod assembly is connected with the manual device, the manual device drives the valve rod assembly to move through the valve rod nut so as to drive the valve clack to move, and circulation or stopping of materials is achieved. The problems that in the prior art, an independent control mechanism is lacked, independent temperature control is difficult to conduct according to actual requirements of different pipelines, and heat media are wasted are solved.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of valve manufacturing, in particular to a Y-shaped melt three-way valve. BACKGROUND

[0002] The Y-shaped melt three-way valve can switch between one inlet pipeline and two outlet pipelines, realize different flow direction distribution of materials, and play an important role in a process flow such as polyester chemical fiber production, and can accurately control the flow path and flow rate of materials.

[0003] However, the existing heat medium circulation system lacks an independent control mechanism, and can only adopt a unified heat medium supply and temperature regulation mode for the entire valve body. In the actual polyester chemical fiber production process, materials in different pipelines have different requirements for temperature. For example, the materials in some pipelines need a higher temperature to maintain good fluidity, while the materials in other pipelines can meet the production requirements at a relatively low temperature. Due to the inability to perform independent temperature control, in order to ensure that the materials in the high-temperature requirement pipeline reach the required temperature, the supply amount and temperature of the entire heat medium circulation system need to be increased.

[0004] Therefore, the prior art lacks an independent control mechanism, and it is difficult to perform independent temperature control according to the actual requirements of different pipelines, resulting in waste of heat medium. CONTENT OF THE INVENTION

[0005] The application provides a Y-shaped melt three-way valve, which solves the problem that the prior art lacks an independent control mechanism and it is difficult to perform independent temperature control according to the actual requirements of different pipelines, resulting in waste of heat medium.

[0006] The application provides a Y-shaped melt three-way valve, which comprises a heat preservation sleeve structure, a valve clack, a valve stem assembly, a manual device and a valve stem nut. The heat preservation sleeve structure is closely attached to the outside of the valve body and is used for introducing heat medium to maintain the temperature of the materials inside the valve body. The valve body inlet pipeline and the two valve body outlet pipelines are respectively provided with a heat medium inlet and a heat medium outlet. The heat medium inlets and outlets corresponding to each pipeline form independent heat medium circulation channels through the heat preservation sleeve structure. The valve body forms a flow channel for materials, and the flow direction of the materials in the flow channel is controlled by the valve clack, which is located inside the valve body. One end of the valve stem assembly is connected with the valve clack, and the other end is connected with the manual device. The manual device drives the valve stem assembly to move through the valve stem nut to drive the valve clack to move, thereby realizing the flow or cutoff of the materials.

[0007] In a possible implementation, the heat preservation sleeve structure comprises a first heat preservation assembly and two symmetrical second heat preservation assemblies; the first heat preservation assembly comprises a sleeve body and is provided with a first heat medium inlet and a first heat medium outlet; the second heat preservation assembly comprises two sleeve bodies, which are in communication with each other, one of the sleeve bodies is provided with a second heat medium inlet, and the other sleeve body is provided with a second heat medium outlet.

[0008] In a possible implementation, the valve rod assembly comprises a lower valve rod, a ring sleeve, a split ring and an upper valve rod; one end of the lower valve rod is fixedly connected with the valve disc, and the other end is connected with the upper valve rod through the ring sleeve and the split ring; the ring sleeve is sleeved at the connection position of the upper valve rod and the lower valve rod, and the split ring is embedded in the ring sleeve at the connection position of the upper valve rod and the lower valve rod; the manual device drives the rotation of the valve rod nut, the valve rod nut is threadedly connected with the upper valve rod, and the valve rod nut converts the rotary motion into the linear motion of the upper valve rod and the lower valve rod to drive the movement of the valve disc.

[0009] In a possible implementation, the valve rod assembly further comprises a check ring; the check ring is sleeved outside the split ring and is clamped with the outside of the split ring and abuts against the end of the ring sleeve.

[0010] In a possible implementation, the valve cover assembly is further provided; the valve cover assembly is connected with the valve body, and a metal winding gasket is arranged at the connection position of the valve cover assembly and the valve body.

[0011] In a possible implementation, a sealing structure is arranged between the valve cover assembly and the valve rod assembly; the sealing structure comprises a vacuum packing group, a packing pressing sleeve and a packing pressing plate; the vacuum packing group comprises, from top to bottom, a packing sealing gasket, a packing gasket, a spacer ring, a packing, an O-shaped ring I and an O-shaped ring II; the packing pressing sleeve is sleeved outside the valve rod assembly, and the lower end of the packing pressing sleeve is in contact with the upper end surface of the vacuum packing group; the packing pressing plate is located above the packing pressing sleeve and is fixedly connected with the valve cover assembly.

[0012] In a possible implementation, a nitrogen injection inlet is further provided; the nitrogen injection inlet is mounted on the outer circle of the flange of the valve cover assembly; the nitrogen injection inlet is used for injecting nitrogen into the metal winding gasket between the valve body and the valve cover assembly.

[0013] In a possible implementation, a stand, a support assembly and a guide plate are further provided; the stand is vertically mounted on the top of the support assembly; the guide plate is mounted on the stand; the valve rod assembly passes through the guide plate, the guide plate is provided with a guide hole matched with the valve rod assembly, and the guide plate guides the movement direction of the valve rod assembly.

[0014] In a possible implementation, the surface of the manual device is provided with anti-skid lines.

[0015] The technical solutions provided in this application, including one or more, have at least the following technical effects or advantages: The insulation jacket structure of this application is tightly fitted to the outside of the valve body for introducing heat medium to maintain the temperature of the material inside the valve body. The valve body inlet pipe and two valve body outlet pipes are respectively provided with heat medium inlets and outlets, and the corresponding heat medium inlets and outlets of each pipe form independent heat medium circulation channels through the insulation jacket structure. The flow rate and temperature of the heat medium entering each channel can be precisely adjusted according to the actual temperature requirements of the material in each pipe. This avoids overheating of low-temperature demand pipes caused by unified heating in traditional designs, effectively reducing heat medium waste. A material flow channel is formed inside the valve body, and the flow direction of the material in the flow channel is controlled by the valve disc, which is located inside the valve body. One end of the valve stem assembly is connected to the valve disc, and the other end is connected to a manual device. The manual device drives the valve stem assembly to move through the valve stem nut, thereby moving the valve disc to realize the flow or cut-off of material. This solves the problem of existing technologies lacking an independent control mechanism, making it difficult to independently control the temperature according to the actual needs of different pipelines, which leads to the waste of heat transfer medium. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments of this application or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 A schematic diagram of a Y-type melt three-way valve provided in an embodiment of this application;

[0018] Figure 2 A schematic diagram of the insulation sleeve structure provided in the embodiments of this application;

[0019] Figure 3 A schematic diagram of the valve stem assembly provided in an embodiment of this application;

[0020] Figure 4 The following are provided for the embodiments of this application: Figure 3 Schematic diagram of the cross-sectional structure along the AA direction;

[0021] Figure 5 This is an enlarged schematic diagram of the vacuum packing assembly provided in the embodiments of this application;

[0022] Figure 6 This is a partial structural cross-sectional view of the vacuum packing assembly provided in an embodiment of this application.

[0023] Reference numerals: 1-Insulation sleeve structure; 11-First insulation component; 111-First heat medium inlet; 112-First heat medium outlet; 12-Second insulation component; 121-Second heat medium inlet; 122-Second heat medium outlet; 2-Valve disc; 3-Valve stem assembly; 31-Lower valve stem; 32-Ring sleeve; 33-Split ring; 34-Upper valve stem; 35-Retaining ring; 4-Manual device; 5-Valve stem nut; 6-Valve cover assembly; 7-Metal spiral wound gasket; 8-Sealing structure; 81-Vacuum packing assembly; 811-Packing seal gasket; 812-Packing gasket; 813-Spacer ring; 814-Packing; 815-O-ring I; 816-O-ring II; 82-Packing pressure sleeve; 83-Packing pressure plate; 9-Nitrogen injection port; 10-Column; 13-Support assembly; 14-Guide plate. Detailed Implementation

[0024] In the description of the embodiments of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this application according to the specific circumstances.

[0025] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0026] Figure 1 This is a schematic diagram of a Y-type melt three-way valve provided in an embodiment of this application. Figure 1As shown, the Y-type melt three-way valve includes an insulation sleeve structure 1, a valve disc 2, a valve stem assembly 3, a manual device 4, and a valve stem nut 5. The Y-type melt three-way valve of this application is mainly used in the polymerization pipeline of polyester fiber production processes. The melt three-way valve is equipped with one valve body inlet pipe and two valve body outlet pipes. The valve body inlet pipe is located above the center of the valve, and the two valve body outlet pipes are symmetrically distributed on both sides below the inlet pipe. The components of the melt three-way valve are symmetrically arranged on the two valve body outlet pipe sides.

[0027] The insulation jacket structure 1 is tightly fitted to the outside of the valve body and is used to introduce heat medium to maintain the temperature of the material inside the valve body.

[0028] Specifically, the insulation jacket structure 1 is tightly fitted to the outside of the valve body. Its main function is to introduce heat medium to maintain the temperature of the material inside the valve body, ensuring that the material flows at a suitable temperature and avoiding the influence of temperature changes on the material's properties and flow performance. The suitable temperature can be 285℃.

[0029] The valve body inlet pipe and the two valve body outlet pipes are respectively equipped with heat medium inlet and heat medium outlet. The heat medium inlet and heat medium outlet of each pipe form an independent heat medium circulation channel through the heat insulation sleeve structure 1.

[0030] The insulation jacket structure 1 includes a first insulation component 11 and two symmetrical second insulation components 12. The first insulation component 11 includes a jacket body and is provided with a first heat medium inlet 111 and a first heat medium outlet 112. The second insulation component 12 includes two jacket bodies that are interconnected, one jacket body is provided with a second heat medium inlet 121, and the other jacket body is provided with a second heat medium outlet 122.

[0031] It should be noted that there can be two second heat medium outlets 122.

[0032] Figure 2This is a schematic diagram of the insulation jacket structure provided in this application embodiment. The heat medium enters the insulation jacket structure 1 through various heat medium inlets. The Y-type melt three-way valve can be considered as having three heat medium circulation areas: the area corresponding to the left valve body outlet pipe, the middle section of the valve body, and the area corresponding to the right valve body outlet pipe. Due to the symmetrical arrangement of two valve body outlet pipes, plus the middle section of the valve body, each area has an independent heat medium inlet channel. The heat medium flows within the heat medium circulation channel formed by the insulation jacket structure 1. During this process, the heat of the heat medium is transferred to the valve body, thereby maintaining the temperature of the material inside the valve body. The heat medium, having absorbed heat, flows out from the corresponding heat medium outlet, completing one cycle. Furthermore, the heat medium circulation channels of these three heat medium circulation areas are independent of each other, meaning that the heat medium flow rate and temperature in different areas can be controlled separately to adapt to diverse operating conditions. The heat medium baffle can guide the heat medium to flow along a specific path within the channel formed by the insulation jacket structure 1, ensuring that the heat medium can fully exchange heat with the valve body, effectively transferring heat to the material inside the valve body and maintaining the material's temperature stability. For example, when only one outlet pipeline needs to be opened, the heat medium inlet and outlet on the other two areas that do not require operation can be closed, avoiding unnecessary waste of heat medium. When it is necessary to open the pipelines corresponding to other areas, first open the heat medium inlet corresponding to that area, allow the heat medium to circulate for a period of time, and then open the valve after the temperature has stabilized, ensuring that the material flows in a stable temperature environment. This heat medium circulation design can effectively maintain the temperature stability of the material inside the valve body.

[0033] A material flow channel is formed inside the valve body. The flow direction of the material in the flow channel is controlled by the valve disc 2, which is located inside the valve body. One end of the valve stem assembly 3 is connected to the valve disc 2, and the other end is connected to the manual device 4. The manual device 4 drives the valve stem assembly 3 to move through the valve stem nut 5, thereby moving the valve disc 2 to realize the flow or cut-off of the material.

[0034] Specifically, when the valve is closed, the sealing surface of valve disc 2 is tightly fitted with the sealing surface of the valve body, forming a reliable seal that effectively prevents the material from continuing to flow, thus achieving material shut-off. When the valve is open, valve disc 2 moves away from the sealing surface of the valve body, creating a flow space for the material, allowing it to pass smoothly through the flow channel of the valve body, achieving the purpose of material flow.

[0035] Furthermore, the surface of the manual device 4 is provided with anti-slip texture. The operator provides power for the movement of the valve stem assembly 3 by manually operating the manual device 4. The anti-slip texture design increases the friction between the operator's hand and the manual device 4, ensuring a more stable grip on the manual device 4 during operation, making the operation safer, more convenient, and more precise.

[0036] Figure 3 This is a schematic diagram of a valve stem assembly provided in an embodiment of this application.Figure 4 The following are provided for the embodiments of this application: Figure 3 A cross-sectional view along the AA direction. The valve stem assembly 3 includes a lower valve stem 31, a ring 32, a split ring 33, and an upper valve stem 34. One end of the lower valve stem 31 is fixedly connected to the valve disc 2, and the other end is connected to the upper valve stem 34 via the ring 32 and the split ring 33. The ring 32 is fitted onto the connection between the upper valve stem 34 and the lower valve stem 31, and the split ring 33 is embedded in the connection between the ring 32 and the upper valve stem 34 and the lower valve stem 31. The manual device 4 drives the valve stem nut 5 to rotate. The valve stem nut 5 is threadedly connected to the upper valve stem 34, and the valve stem nut 5 converts the rotational motion into linear motion of the upper valve stem 34 and the lower valve stem 31, thereby moving the valve disc 2. The valve stem assembly 3 also includes a retaining ring 35. The retaining ring 35 is fitted onto the outside of the split ring 33 and engages with the outside of the split ring 33, abutting against the end of the ring 32.

[0037] Specifically, traditional one-piece valve stems, due to their long length, require sophisticated processing equipment and techniques, leading to high processing difficulty and inconsistent precision, which in turn increases processing costs and reduces production efficiency. Furthermore, long valve stems are prone to deformation during processing, transportation, and installation. This application cleverly avoids these problems by employing a separate upper valve stem 34 and lower valve stem 31 structure. Processing the upper valve stem 34 and lower valve stem 31 separately reduces processing difficulty and lowers the requirements for processing equipment, thus improving processing precision and production efficiency. Connecting the upper valve stem 34 and lower valve stem 31 together via a ring 32 and a split ring 33 ensures a secure connection while facilitating disassembly and assembly. When maintenance or replacement of the upper valve stem 34 or lower valve stem 31 is required, simply removing the ring 32 and split ring 33 suffices, making the operation quick and easy, reducing maintenance costs and time.

[0038] This application also includes a valve cover assembly 6. The valve cover assembly 6 is connected to the valve body, and a metal spiral wound gasket 7 is provided at the connection between the valve cover assembly 6 and the valve body. The metal spiral wound gasket 7 is made of metal strips and non-metallic filler materials wound together, which has good elasticity and sealing properties, thereby enhancing the sealing performance of the valve.

[0039] A sealing structure 8 is provided between the valve cover assembly 6 and the valve stem assembly 3. The sealing structure 8 includes a vacuum packing assembly 81, a packing sleeve 82, and a packing pressure plate 83.

[0040] Figure 5 This is an enlarged schematic diagram of the vacuum packing assembly provided in the embodiments of this application. Figure 6 This is a partial cross-sectional view of the vacuum packing assembly provided in an embodiment of this application. The vacuum packing assembly 81 includes, from top to bottom, a packing gasket 811, a packing pad 812, a spacer ring 813, a packing 814, an O-ring I 815, and an O-ring II 816.

[0041] Specifically, the vacuum packing assembly 81 employs an O-ring and a multi-angle compensation sealing structure 8. This structure combines the reliability of O-ring sealing with the flexibility of multi-angle compensation, effectively adapting to various operating conditions during the movement of the upper valve stem 34 and lower valve stem 31, ensuring a sealing effect. Two O-rings, O-ring I 815 and O-ring II 816, form a double sealing defense. During valve operation, the medium may attempt to leak through the small gap between the valve stem assembly 3 and the vacuum packing assembly 81. O-ring I 815 can block most of the medium, providing an initial seal. Even if O-ring I 815 experiences minor leakage due to long-term use and wear, O-ring II 816 can continue to perform its sealing function, preventing further leakage. The vacuum packing assembly 81 prevents outside air from entering the material, ensuring product quality. The packing 814 in this application can be flexible graphite packing, and the packing gasket 811 can be made of PPL (para-polystyrene).

[0042] The packing sleeve 82 is fitted outside the valve stem assembly 3, and its lower end contacts the upper end face of the vacuum packing group 81. The packing pressure plate 83 is located above the packing sleeve 82 and is fixedly connected to the valve cover assembly 6.

[0043] Specifically, the packing sleeve 82 is fitted over the valve stem assembly 3, with its lower end contacting the upper surface of the O-ring II 816. It applies pressure to the vacuum packing assembly 81 to ensure a tight seal. Simultaneously, the packing sleeve 82 serves a positioning function, preventing displacement of the vacuum packing assembly 81 during valve stem movement. The packing pressure plate 83 is located above the packing sleeve 82 and is fixedly connected to the valve cover assembly 6. The packing pressure plate 83 compresses the packing sleeve 82, thereby transmitting pressure to the vacuum packing assembly 81 and ensuring the stability and sealing performance of the entire sealing structure 8.

[0044] This application also includes a nitrogen injection port 9. The nitrogen injection port 9 is installed on the outer diameter of the flange of the valve cover assembly 6. The nitrogen injection port 9 is used to inject nitrogen into the spiral wound gasket 7 between the valve body and the valve cover assembly 6. This solves the problem of external leakage due to failure of the spiral wound gasket 7 during normal production, where on-site replacement is not possible by stopping the production line; injecting nitrogen can temporarily resolve the leakage issue.

[0045] This application also includes a column 10, a bracket assembly 13, and a guide plate 14. The column 10 is vertically mounted on the top of the bracket assembly 13. The guide plate 14 is mounted on the column 10. The valve stem assembly 3 passes through the guide plate 14, and the guide plate 14 is provided with a guide hole that matches the valve stem assembly 3. The guide plate 14 guides the movement direction of the valve stem assembly 3.

[0046] Specifically, the column 10 is vertically installed on top of the support assembly 13, ensuring its stability. The valve stem assembly 3 passes through the guide plate 14, which has a guide hole specifically designed to match the valve stem assembly 3. During the opening and closing of the valve, the valve stem assembly 3 needs to perform precise linear movement to ensure that the valve disc 2 accurately reaches the designated position, enabling material flow or shut-off. The guide hole of the guide plate 14 fits tightly with the valve stem assembly 3, guiding it to move in a straight line and preventing it from tilting or wobbling during movement.

[0047] The various embodiments in this specification are described in a progressive manner. For the same or similar parts between the various embodiments, please refer to each other. Each embodiment focuses on describing the differences from other embodiments.

[0048] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. A Y-type melt three-way valve, characterized in that, It includes an insulation sleeve structure (1), a valve disc (2), a valve stem assembly (3), a manual device (4), and a valve stem nut (5); The insulation sleeve structure (1) is tightly fitted to the outside of the valve body for introducing heat medium to maintain the temperature of the material inside the valve body; The valve body inlet pipe and the two valve body outlet pipes are respectively provided with heat medium inlet and heat medium outlet. The heat medium inlet and heat medium outlet of each pipe form an independent heat medium circulation channel through the heat insulation sleeve structure (1). The valve body forms a material flow channel, and the flow direction of the material in the flow channel is controlled by the valve disc (2), which is located inside the valve body. One end of the valve stem assembly (3) is connected to the valve disc (2), and the other end is connected to the manual device (4). The manual device (4) drives the valve stem assembly (3) to move through the valve stem nut (5), thereby driving the valve disc (2) to move and realize the flow or cut-off of materials.

2. The Y-type melt three-way valve according to claim 1, characterized in that, The insulation sleeve structure (1) includes a first insulation component (11) and two symmetrical second insulation components (12). The first thermal insulation component (11) includes a sleeve and is provided with a first heat medium inlet (111) and a first heat medium outlet (112). The second insulation component (12) includes two sleeves that are connected to each other. One sleeve is provided with a second heat medium inlet (121), and the other sleeve is provided with a second heat medium outlet (122).

3. The Y-type melt three-way valve according to claim 1, characterized in that, The valve stem assembly (3) includes a lower valve stem (31), a ring sleeve (32), a split ring (33), and an upper valve stem (34). One end of the lower valve stem (31) is fixedly connected to the valve disc (2), and the other end is connected to the upper valve stem (34) through a ring sleeve (32) and a split ring (33); The ring sleeve (32) is fitted onto the connection between the upper valve stem (34) and the lower valve stem (31), and the split ring (33) is embedded in the connection between the ring sleeve (32) and the upper valve stem (34) and the lower valve stem (31); The manual device (4) drives the valve stem nut (5) to rotate. The valve stem nut (5) is threadedly connected to the upper valve stem (34). The valve stem nut (5) converts the rotational motion into the linear motion of the upper valve stem (34) and the lower valve stem (31) to drive the valve disc (2) to move.

4. The Y-type melt three-way valve according to claim 3, characterized in that, The valve stem assembly (3) also includes a retaining ring (35); The retaining ring (35) is fitted on the outside of the split ring (33) and engages with the outside of the split ring (33), and abuts against the end of the ring sleeve (32).

5. The Y-type melt three-way valve according to claim 4, characterized in that, It also includes a valve cover assembly (6); The valve cover assembly (6) is connected to the valve body, and a metal spiral wound gasket (7) is provided at the connection between the valve cover assembly (6) and the valve body.

6. The Y-type melt three-way valve according to claim 5, characterized in that, A sealing structure (8) is provided between the valve cover assembly (6) and the valve stem assembly (3); The sealing structure (8) includes a vacuum packing assembly (81), a packing sleeve (82), and a packing plate (83); The vacuum packing assembly (81) includes, from top to bottom, a packing gasket (811), a packing pad (812), a spacer ring (813), a packing (814), an O-ring I (815), and an O-ring II (816). The packing sleeve (82) is fitted outside the valve stem assembly (3), and its lower end is in contact with the upper end face of the vacuum packing group (81); The packing pressure plate (83) is located above the packing sleeve (82) and is fixedly connected to the valve cover assembly (6).

7. The Y-type melt three-way valve according to claim 6, characterized in that, It also includes a nitrogen injection port (9); The nitrogen injection port (9) is installed on the outer circle of the flange of the valve cover assembly (6); The nitrogen injection port (9) is used to inject nitrogen into the metal spiral wound pad (7) between the valve body and the valve cover assembly (6).

8. The Y-type melt three-way valve according to claim 7, characterized in that, It also includes columns (10), support components (13) and guide plates (14); The column (10) is vertically installed on top of the bracket assembly (13); The guide plate (14) is installed on the column (10); The valve stem assembly (3) passes through the guide plate (14), which has a guide hole that matches the valve stem assembly (3). The guide plate (14) guides the movement direction of the valve stem assembly (3).

9. The Y-type melt three-way valve according to claim 1, characterized in that, The surface of the manual device (4) is provided with anti-slip texture.

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