Linkage valve

Abstract

The present invention discloses a linkage valve, in which a switching valve stem is slidably provided in the central through hole of the valve seat, an exhaust and discharge channel is connected with the feed hole through a vertical hole, a valve stem seat is provided on the upper part of the vertical hole, a discharge valve stem is slidably provided in the valve stem seat, the discharge valve stem extends into the vertical hole, and a plurality of exhaust and discharge channels are provided inside the valve seat corresponding to each feed hole, and the exhaust and discharge channels are connected with the vertical hole of the valve seat; a sealing structure is provided at the lower part of the vertical hole near the feed hole, and the sealing is achieved by cooperating with the structure at the bottom of the discharge valve stem. The exhaust and discharge channel of the present invention is directly provided on the valve seat, and the travel of the exhaust gas and waste material discharge flow channel is greatly reduced. On the one hand, when the material flows from bottom to top, it only needs to overcome a small gravitational potential energy to reach the exhaust and discharge channel, and the energy consumption required to complete the online exhaust and discharge is greatly reduced; on the other hand, the length of the guide section of the discharge valve stem is reduced, thereby reducing the area where the dead zone is formed on the guide section, the guide part and the vertical hole.

Description

Technical Field

[0001] The invention relates to the technical field of secondary recycling filtering equipment for polymerized polyester, chemical fiber products and waste plastics, in particular to a linkage valve for secondary recycling filtering equipment for waste plastics. Background Art

[0002] In the polymer polyester and chemical fiber industries, especially in the secondary recycling industry of waste plastics, melt filtration equipment is usually used to filter the melt raw materials of polymers, chemical fiber products and waste plastics. A linkage valve is used on the melt filtration equipment to realize the inlet and outlet of the internal filter chamber and the channel switching; in order to realize online exhaust and discharge and real-time inspection of the quality of the melt material, the melt filtration equipment must also be equipped with an exhaust and discharge valve.

[0003] Existing linkage valves and exhaust valves used in melt filtration equipment are as follows: Figure 1As shown, the valve body 2 of the exhaust and discharge valve is fixedly installed on the valve seat 1 of the linkage valve, and the valve seat 1 of the linkage valve is provided with an inlet and outlet hole 8 and a vertical hole 7 connected thereto; the discharge valve stem 3 of the valve body 2 of the exhaust and discharge valve is slidably arranged in a first central hole 9 which passes through the center thereof, and a guide section 4 is arranged at the lower end of the discharge valve stem 3, and a first conical surface 13 is arranged at the upper end of the guide section 4, and a guide portion 6 is arranged at the lower end of the first central hole 9 correspondingly, and a second conical surface 15 is arranged at the upper end of the guide portion 6, and the second conical surface 15 is in contact with the first conical surface 13. Correspondingly, the guide portion 6 corresponds to the vertical hole 7 on the valve seat 1, and an exhaust and discharge channel 5 connected to the first center hole 9 is provided on the valve body 2 above the guide portion 6. The exhaust and discharge channel 5 can be opened and closed by the up and down sliding movement of the discharge valve stem 3, thereby realizing online exhaust and discharge and real-time inspection of the quality of the melt material; when the discharge valve stem 3 closes the exhaust and discharge channel 5, its first conical surface 13 is pressed against the second conical surface 15 of the valve body 2 to achieve sealing between the exhaust and discharge channel 5 and the inlet and outlet holes 8. This method of achieving online exhaust and discharge by adding an exhaust and discharge valve to a linkage valve has the following problems: (1) The exhaust and discharge channel 5 of the exhaust and discharge valve is opened above the guide portion 6. When the exhaust and discharge channel 5 is opened for exhaust and discharge, the material in the internal channel of the valve seat 1 needs to flow through the vertical hole 7, the guide portion 6, and part of the first center hole 9 before being discharged from the exhaust and discharge channel 5. The exhaust gas and waste discharge flow path has a long stroke. On the one hand, the waste flows from bottom to top and needs to overcome a large gravitational potential energy to reach the exhaust and discharge channel 5. The exhaust and discharge valve needs to consume a large amount of energy to complete online exhaust and discharge. On the other hand, On the one hand, since the exhaust gas and waste material discharge flow path is relatively long, especially since the guide part of the discharge valve stem is relatively long, a dead zone is formed for the melt channel, which can easily lead to melt degradation. After the exhaust and discharge are completed, the materials in the discharge flow channel, especially the degraded materials, do not have enough kinetic energy to overcome the gravitational potential energy and cannot be discharged from the discharge flow channel, but remain in the discharge flow channel. The exhaust and discharge of the exhaust and discharge channel 5 is not thorough enough. When the discharge valve stem 3 slides downward to close the exhaust and discharge channel 5, it is pressed back into the internal channel of the valve seat 1 and mixed with the material in the internal channel, thereby affecting the quality of the melt material in the channel. (2) The exhaust and discharge channel 5 is opened on the exhaust and discharge valve, and there is no additional sealing component between the exhaust and discharge channel 5 and the inlet and outlet holes 8. The sealing between the exhaust and discharge channel 5 and the inlet and outlet holes 8 is achieved only through the outer surface of the discharge valve stem 3. In order to ensure the sealing and reliability of the discharge valve stem 3, it is necessary to ensure that the outer surface of the discharge valve stem 3 of the exhaust and discharge valve and the inner surface of the first center hole 9 have high surface accuracy requirements. At the same time, when the exhaust and discharge valve is installed on the valve seat 1 of the linkage valve, it is also necessary to ensure that the discharge valve stem 3 and the vertical hole 7 of the valve seat 1 have high installation accuracy requirements. This greatly increases the difficulty of processing, assembling and maintaining parts, and thus increases the cost of production and maintenance.(3) The discharge valve stem 3 realizes the sealing between the exhaust and discharge passage 5 and the inlet and outlet holes 8 by corresponding conical surface matching. In order to ensure the reliability of the sealing and high installation accuracy, the second conical surface 15 corresponding to the first conical surface 13 of the discharge valve stem 3 needs to be set at the upper end of the guide portion 6 of the valve body 2. In order to ensure that the material in the internal channel of the valve seat 1 does not enter the vertical hole 7 when the discharge valve stem 3 is in a closed state, the length of the guide section 4 of the discharge valve stem 3 needs to be approximately equal to the height of the guide section 6 plus the height of the entire vertical hole 7, that is, the length of the guide section 4 is longer as a whole; and there is a clearance match between the guide section 4 and the guide section 6 and the vertical hole 7. During the operation, the material in the internal channel of the valve seat 1 will more or less leak into the clearance. After a long period of operation, the impurity particles in the material will gradually be retained and deposited on the outer peripheral surface of the guide section 4 or the inner peripheral surface of the guide section 6 and the vertical hole 7. The deposited impurity particles cannot be removed, and a large dead zone will be formed on the guide section 4, the guide section 6 and the vertical hole 7. Summary of the invention

[0004] In view of the above-mentioned existing linkage valves that need to be equipped with exhaust and discharge valves, which have the disadvantages of incomplete exhaust and discharge, large dead zones, and increased production and maintenance costs, the applicant provides a linkage valve with a reasonable structure. An exhaust and discharge channel is directly opened on the linkage valve, which ensures thorough exhaust and discharge, reduces dead zones, and reduces production and maintenance costs.

[0005] The technical solution adopted by the present invention is as follows:

[0006] A linkage valve, a switching valve stem is slidably provided in the central through hole of the valve seat along the axial direction, a vertical hole, a plurality of feed holes and a discharge hole communicated with the central through hole are opened in the valve seat, an exhaust and discharge channel is communicated with the feed hole through the vertical hole, a valve stem seat is arranged on the upper part of the vertical hole, a discharge valve stem is slidably provided in the valve stem seat, the discharge valve stem extends into the vertical hole, a plurality of exhaust and discharge channels are opened inside the valve seat corresponding to each feed hole, the exhaust and discharge channels are communicated with the vertical hole of the valve seat; a sealing structure is arranged at the lower part of the vertical hole near the feed hole, and the sealing is achieved by cooperating with the structure at the bottom of the discharge valve stem.

[0007] The exhaust and discharge channel of the present invention is directly opened on the valve seat, and the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced. On the one hand, when the material flows from bottom to top, it only needs to overcome a small gravitational potential energy to reach the exhaust and discharge channel, and the energy consumption required to complete online exhaust and discharge is greatly reduced; on the other hand, since the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced, the distance between the exhaust and discharge channel and the feed hole is very small, especially since the guide part of the discharge valve stem is shortened, the dead zone of the melt channel is basically eliminated, and there is no melt degradation. After the exhaust and discharge is completed, the material in the discharge flow channel can easily overcome the small gravitational potential energy under the inertia of movement, and be discharged upward into the exhaust and discharge channel, so that the exhaust and discharge of the exhaust and discharge channel is more thorough, thereby ensuring the quality of the melt material in the internal channel.

[0008] As a further improvement of the above technical solution:

[0009] The sealing structure is a hard seal provided between the feed hole and the exhaust and discharge channel.

[0010] A seal is used between the feed hole and the exhaust discharge channel of the present invention. As long as the first conical surface of the discharge valve stem is pressed tightly against the seal, good sealing and reliability can be guaranteed. This reduces the surface accuracy requirements of the outer surface of the discharge valve stem and the inner surface of the vertical hole, and also reduces the installation accuracy requirements of the discharge valve stem and the vertical hole, thereby reducing the difficulty of processing, assembling and maintaining parts, thereby reducing the cost of production and maintenance.

[0011] A guide section is provided at the lower end of the discharge valve stem, and a first conical surface is formed at the upper end of the guide section; a guide part is provided at the lower end of the vertical hole corresponding to the guide section, and a second conical surface corresponding to the first conical surface is formed at the upper end of the guide part.

[0012] The sealing structure is a hard seal arranged between the feed hole and the exhaust discharge channel; a guide section is arranged at the lower end of the discharge valve stem, and a first conical surface is formed at the upper end of the guide section; a guide part is arranged at the lower end of the vertical hole corresponding to the guide section, and a second conical surface corresponding to the first conical surface is formed at the upper end of the guide part; and the hard seal is welded on the second conical surface.

[0013] The sealing structure is a hard seal arranged between the feed hole and the exhaust discharge channel; a guide section is provided at the lower end of the discharge valve stem, and a first conical surface is formed at the upper end of the guide section; a guide part is provided at the lower end of the vertical hole corresponding to the guide section, and a second conical surface corresponding to the first conical surface is formed at the upper end of the guide part; the guide part and the seal are located below the exhaust discharge channel.

[0014] Since the exhaust and discharge channel of the present invention is directly opened on the valve seat, the distance between the exhaust and discharge channel and the feed hole is greatly reduced, and the guide part and the sealing part are located below the exhaust and discharge channel, the height of the guide part is greatly reduced, and the length of the guide section of the corresponding discharge valve stem is also greatly reduced, thereby greatly reducing the area where the dead zone exists.

[0015] The angle between the central axis of the exhaust and discharge channel and the plumb line is an obtuse angle.

[0016] The angle between the central axis of the exhaust and discharge channel of the present invention and the plumb line is an obtuse angle, that is, the exhaust and discharge channel is inclined downward at a certain angle from the inside to the outside. After the exhaust and discharge are completed, the residual material in the exhaust and discharge channel can slide downward along the inner wall surface of the exhaust and discharge channel under the action of gravity and be discharged, so that the exhaust gas and waste are discharged more thoroughly.

[0017] The exhaust and discharge channel and the feed hole are located on both sides of the plumb line.

[0018] The exhaust and discharge passage and the feed hole of the present invention are located on both sides of the plumb line, so that the space outside the linkage valve can be fully utilized and various related connection devices can be reasonably arranged.

[0019] The feed hole and the discharge hole are located on the same side of the plumb line.

[0020] The feed hole and the discharge hole of the present invention are located on the same side of the plumb line, which can save installation space and make the overall structure of the linkage valve more compact and small.

[0021] The vertical holes and the exhaust and discharge channels are arranged offset from the central through hole.

[0022] The exhaust and discharge channel is located above the central through hole; the central axes of the plurality of feed holes are located on the same plane.

[0023] The beneficial effects of the present invention are as follows:

[0024] The exhaust and discharge channel of the present invention is directly opened on the valve seat, and the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced. On the one hand, when the material flows from bottom to top, it only needs to overcome a small gravitational potential energy to reach the exhaust and discharge channel, and the energy consumption required to complete online exhaust and discharge is greatly reduced; on the other hand, since the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced, the distance between the exhaust and discharge channel and the feed hole is very small, especially since the guide part of the discharge valve stem is shortened, the dead zone of the melt channel is basically eliminated, and there is no melt degradation. After the exhaust and discharge is completed, the material in the discharge flow channel can easily overcome the small gravitational potential energy under the inertia of movement, and be discharged upward into the exhaust and discharge channel, so that the exhaust and discharge of the exhaust and discharge channel is more thorough, thereby ensuring the quality of the melt material in the internal channel.

[0025] A seal is used between the feed hole and the exhaust discharge channel of the present invention. As long as the first conical surface of the discharge valve stem is pressed tightly against the seal, good sealing and reliability can be guaranteed. This reduces the surface accuracy requirements of the outer surface of the discharge valve stem and the inner surface of the vertical hole, and also reduces the installation accuracy requirements of the discharge valve stem and the vertical hole, thereby reducing the difficulty of processing, assembling and maintaining parts, thereby reducing the cost of production and maintenance.

[0026] Since the exhaust and discharge channel of the present invention is directly opened on the valve seat, the distance between the exhaust and discharge channel and the feed hole is greatly reduced, and the guide part and the sealing part are located below the exhaust and discharge channel, the height of the guide part is greatly reduced, and the length of the guide section of the corresponding discharge valve stem is also greatly reduced, thereby greatly reducing the area where the dead zone exists.

[0027] The angle between the central axis of the exhaust and discharge channel of the present invention and the plumb line is an obtuse angle, that is, the exhaust and discharge channel is inclined downward at a certain angle from the inside to the outside. After the exhaust and discharge are completed, the residual material in the exhaust and discharge channel can slide downward along the inner wall surface of the exhaust and discharge channel under the action of gravity and be discharged, so that the exhaust gas and waste are discharged more thoroughly.

[0028] The exhaust and discharge passage and the feed hole of the present invention are located on both sides of the plumb line, so that the space outside the linkage valve can be fully utilized and various related connection devices can be reasonably arranged.

[0029] The feed hole and the discharge hole of the present invention are located on the same side of the plumb line, which can save installation space and make the overall structure of the linkage valve more compact and small. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a cross-sectional view of the existing linkage valve and the exhaust and discharge valve.

[0031] Figure 2 It is a stereogram of the present invention.

[0032] Figure 3 for Figure 2 sectional view of .

[0033] Figure 4 for Figure 3 Sectional view of AA.

[0034] Figure 5 for Figure 3 Enlarged view of part B in the middle.

[0035] In the figure: 1. valve seat; 2. valve body; 3. discharge valve stem; 4. guide section; 5. exhaust and discharge channel; 6. guide part; 7. vertical hole; 8. inlet and outlet holes; 9. first center hole; 10. valve stem seat; 11. switching valve stem; 12. central through hole; 13. first cone surface; 14. sealing element; 15. second cone surface; 16. conduction section; 17. plane; 18. second center hole; 19. feed hole; 20. discharge hole; α, angle; β, angle. DETAILED DESCRIPTION

[0036] The specific implementation of the present invention will be described below in conjunction with the accompanying drawings.

[0037] like Figure 2 As shown, the outer circumference of the upper side of the cylindrical valve seat 1 of the present invention is provided with a plane 17, and a plurality of valve stem seats 10 are fixedly arranged on the plane 17, such as Figure 3 As shown, a discharge valve stem 3 is slidably disposed in the second center hole 18 in the center of each valve stem seat 10. Figure 4As shown, a central through hole 12 is axially provided at the center of the valve seat 1 to form an internal flow channel. The switching valve stem 11 is slidably disposed in the central through hole 12 and can slide forward and backward along the central through hole 12. A conducting section 16 is provided on the switching valve stem 11, and the outer diameter of the conducting section 16 is smaller than the outer diameter of the remaining portion of the switching valve stem 11. A plurality of feed holes 19 and discharge holes 20 are radially provided on the valve seat 1 corresponding to the conducting section 16. The feed holes 19 and the discharge holes 20 are both communicated with the central through hole 12, and the central axes of the plurality of feed holes 19 are located on the same plane. In this embodiment, two feed holes 19 and one discharge hole 20 are provided on the valve seat 1, and the discharge hole 20 is located in the middle of the two feed holes 19. The switching valve stem 11 can be slid left and right to switch the valve stem 11 body to close one of the feed holes 19, and the conducting section 16 connects the other feed hole 19 with the discharge hole 20, thereby realizing the switching of the feed and discharge channels. As shown Figure 3 As shown, a vertical hole 7 is provided on the valve seat 1 corresponding to each feed hole 19, each vertical hole 7 corresponds to a valve stem seat 10 and a discharge valve stem 3, and the lower end of the discharge valve stem 3 extends into the vertical hole 7; an exhaust and discharge channel 5 is provided on the valve seat 1 above the central through hole 12 and through each vertical hole 7, and the exhaust and discharge channel 5 can be opened or closed by sliding the discharge valve stem 3 up and down; the exhaust and discharge channel 5 is connected to the feed hole 19 through the vertical hole 7, and the exhaust and discharge channel 5 and the vertical hole 7 are offset from the central through hole 12. The exhaust and discharge channel 5 of the present invention is directly opened on the valve seat 1, and the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced. On the one hand, when the material flows from bottom to top, it only needs to overcome a small gravitational potential energy to reach the exhaust and discharge channel 5, and the energy consumption required to complete online exhaust and discharge is greatly reduced; on the other hand, since the stroke of the exhaust gas and waste material discharge flow channel is greatly reduced, especially since the guide part of the discharge valve stem 3 is shortened, the dead zone of the melt channel is basically eliminated, and there is no melt degradation. After the exhaust and discharge is completed, the material in the discharge flow channel can easily overcome the small gravitational potential energy under the inertia of movement, and be discharged upward into the exhaust and discharge channel 5, so that the exhaust and discharge of the exhaust and discharge channel 5 is more thorough, thereby ensuring the quality of the melt material in the internal channel.

[0038] like Figure 3As shown, the central axis of the two feed holes 19 and the central axis of the discharge hole 20 are set at a certain angle α, and the angle α is an acute angle, that is, the feed hole 19 and the discharge hole 20 are located on the same side of the plumb line, which can save installation space and make the overall structure of the linkage valve more compact and small. The exhaust discharge channel 5 is located on the other side opposite to the feed hole 19, that is, the exhaust discharge channel 5 and the feed hole 19 are located on both sides of the plumb line, which can make full use of the space outside the linkage valve and reasonably arrange various related connection devices; the exhaust discharge channel 5 is tilted downward from the inside to the outside at a certain angle, and there is a certain angle β between its central axis and the plumb line, and the angle β is an obtuse angle. After the exhaust discharge is completed, the residual material in the exhaust discharge channel 5 can slide down along the inner wall surface of the exhaust discharge channel 5 under the action of gravity and be discharged, and the exhaust gas and waste are discharged more thoroughly.

[0039] like Figure 5 As shown, the lower end of the discharge valve stem 3 is provided with a guide section 4, the outer diameter of the guide section 4 is smaller than the outer diameter of the upper body of the discharge valve stem 3, so that a first conical surface 13 is formed at the upper end of the guide section 4; the lower end of the vertical hole 7 is provided with a guide portion 6 corresponding to the guide section 4, and a second conical surface 15 corresponding to the first conical surface 13 is formed at the upper end of the guide portion 6, and a hard seal 14 is welded on the second conical surface 15; the guide portion 6 and the seal 14 are located at the lower part of the exhaust discharge channel 5, close to the feed hole 19. When the discharge valve stem 3 moves downward until the first conical surface 13 is pressed and fitted against the sealing member 14, the guide section 4 is located in the guide portion 6, the main body of the discharge valve stem 3 closes the exhaust discharge channel 5, and the sealing member 14 realizes the sealing between the feed hole 19 and the exhaust discharge channel 5; the feed hole 19 and the exhaust discharge channel 5 are sealed by the sealing member 14, as long as the first conical surface 13 of the discharge valve stem 3 is pressed and fitted against the sealing member 14, good sealing and reliability can be guaranteed, which reduces the surface accuracy requirements of the outer surface of the discharge valve stem 3 and the inner surface of the vertical hole 7, and also reduces the installation accuracy requirements of the discharge valve stem 3 and the vertical hole 7, reduces the difficulty of processing, assembling and maintaining parts, and thus reduces the cost of production and maintenance.

[0040] like Figure 5 As shown, since the exhaust and discharge channel 5 of the present invention is directly opened on the valve seat 1, the distance between the exhaust and discharge channel 5 and the feed hole 19 is greatly reduced, and the guide portion 6 and the sealing member 14 are located below the exhaust and discharge channel 5, the height of the guide portion 6 is greatly reduced, and the length of the corresponding guide section 4 of the discharge valve stem 3 is also greatly reduced, thereby greatly reducing the area where dead zones are formed on the guide section 4, the guide portion 6 and the vertical hole 7.

[0041] The present invention is in the process of feeding and discharging materials. Figure 4As shown, the discharge valve stem 3 slides downward to the first conical surface 13 and presses against the sealing member 14, closing the exhaust and discharge channel 5; the switching valve stem 11 slides leftward to the conducting section 16 to connect the feed hole 19 and the discharge hole 20 on the left, and closes the feed hole 19 on the right; the material flows from the feed hole 19 into the internal flow channel of the valve seat 1, and then flows from the discharge hole 20 into the filter chamber for filtration. The feed hole 19 and the discharge hole 20 can also be fed and discharged in the opposite direction, that is, the material flows from the discharge hole 20 into the internal flow channel of the valve seat 1, and flows from the feed hole 19 into the filter chamber for filtration; when the switching valve stem 11 slides rightward to the conducting section 16 to connect the feed hole 19 and the discharge hole 20 on the right, the feed hole 19 on the left is closed, thereby realizing the switching of the feed and discharge channels. When online exhaust and discharge are required, the discharge valve stem 3 is slid upward, the exhaust and discharge channel 5 is opened, and the exhaust gas and waste are discharged from the exhaust and discharge channel 5. The exhaust and discharge passage 5 of the present invention is directly opened on the valve seat 1, the exhaust and waste discharge passage stroke is greatly reduced, and the exhaust and discharge are more thorough.

[0042] The above description is an explanation of the present invention, not a limitation of the present invention. The present invention may be modified in any form without violating the spirit of the present invention. For example, other sealing structures may be provided at the lower part of the vertical hole 7 near the feed hole 19, as long as they can achieve the purpose of sealing by cooperating with the structure at the bottom of the discharge valve stem 3. The exhaust and discharge channel 5 may also be provided at other locations offset from the central through hole 12, and the exhaust and discharge channel 5 is connected to the feed hole 19 through the vertical hole 7, so as to achieve the purpose of exhaust and discharge of each feed hole 19.

Claims

1. A linkage valve, wherein a switching valve stem (11) is slidably provided in a central through hole (12) along the axial direction of a valve seat (1), a vertical hole (7), a plurality of feed holes (19) and a discharge hole (20) which are in communication with the central through hole (12) are provided in the valve seat (1), an exhaust and discharge passage (5) is communicated with the feed hole (19) through the vertical hole (7), a valve stem seat (10) is provided on the upper part of the vertical hole (7), a discharge valve stem (3) is slidably provided in the valve stem seat (10), and the discharge valve stem (3) extends into the vertical hole (7), characterized in that: Corresponding to each feed hole (19), a plurality of exhaust and discharge channels (5) are provided inside the valve seat (1), and the exhaust and discharge channels (5) are connected to the vertical hole (7) of the valve seat (1); a sealing structure is provided at the lower part of the vertical hole (7) near the feed hole (19), and cooperates with the structure at the bottom of the discharge valve stem (3) to achieve sealing.

2. The linkage valve according to claim 1, characterized in that: The sealing structure is a hard sealing member (14) provided between the feed hole (19) and the exhaust and discharge channel (5).

3. The linkage valve according to claim 1, characterized in that: A guide section (4) is provided at the lower end of the discharge valve stem (3), and a first conical surface (13) is formed at the upper end of the guide section (4); a guide portion (6) is provided at the lower end of the vertical hole (7) corresponding to the guide section (4), and a second conical surface (15) corresponding to the first conical surface (13) is formed at the upper end of the guide portion (6).

4. The linkage valve according to claim 1, characterized in that: The sealing structure is a hard seal (14) arranged between the feed hole (19) and the exhaust discharge channel (5); a guide section (4) is arranged at the lower end of the discharge valve stem (3), and a first conical surface (13) is formed at the upper end of the guide section (4); a guide portion (6) is arranged at the lower end of the vertical hole (7) corresponding to the guide section (4), and a second conical surface (15) corresponding to the first conical surface (13) is formed at the upper end of the guide portion (6); and the hard seal (14) is welded on the second conical surface (15).

5. The linkage valve according to claim 1, characterized in that: The sealing structure is a hard seal (14) provided between the feed hole (19) and the exhaust discharge channel (5); a guide section (4) is provided at the lower end of the discharge valve stem (3), and a first conical surface (13) is formed at the upper end of the guide section (4); a guide portion (6) is provided at the lower end of the vertical hole (7) corresponding to the guide section (4), and a second conical surface (15) corresponding to the first conical surface (13) is formed at the upper end of the guide portion (6); the guide portion (6) and the hard seal (14) are located below the exhaust discharge channel (5).

6. The linkage valve according to claim 1, characterized in that: The angle between the central axis of the exhaust and discharge channel (5) and the plumb line is an obtuse angle.

7. The linkage valve according to claim 1, characterized in that: The exhaust and discharge channel (5) and the feed hole (19) are located on both sides of the plumb line.

8. The linkage valve according to claim 1, characterized in that: The feed hole (19) and the discharge hole (20) are located on the same side of the plumb line.

9. The linkage valve according to claim 1, characterized in that: The vertical hole (7) and the exhaust and discharge channel (5) are arranged offset from the central through hole (12).

10. The linkage valve according to claim 1, characterized in that: The exhaust and discharge channel (5) is located above the central through hole (12); and the central axes of the plurality of feed holes (19) are located on the same plane.

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