Flat gate valve with zero leakage of upper seal

Abstract

An upper sealing zero-leakage flat gate valve comprises a valve deck, a valve body, a medium flow channel, a valve seat, a valve rod and a valve plate fixed to the bottom of the valve rod, the valve plate moves in the valve body and is used for controlling the medium flow channel to be opened and closed, a containing cavity is formed in the valve body, the valve plate comprises an upper sealing part extending into the containing cavity, and the upper sealing part is provided with a lower sealing part extending into the containing cavity. The end face of the upper sealing part abuts against the inner wall of the containing cavity to form sealing connection. According to the design, an upper sealing sleeve and a large amount of packing are omitted, the form of a conventional gate plate is changed, the structure that the upper seal and the valve seat seal are combined for sealing is designed, the upper sealing effect is achieved through the abrasion-resistant O-shaped ring, dead pressure packing is reduced, and the sealing effect is improved. And meanwhile, a gap between the valve rod and the filler after being used for a period of time is overcome, and the possibility that a medium leaks from the valve rod is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to a flat gate valve of zero leakage of upper seal belongs to the valve field. BACKGROUND

[0002] In the field of fluid control, as an important fluid control equipment, the gate valve is widely used in various industrial systems, water conservancy projects and civil facilities. However, with the continuous development of industrial technology and the increasing application demand, the traditional gate valve design gradually shows its limitations:

[0003] The disadvantages of the conventional gate valve include that the upper seal structure often increases the sealing difficulty, and a large amount of packing is required to compress the packing at the sealing packing position, which requires a large compression amount to achieve sealing, but at the same time increases the torque. After the valve is used for a long time, a gap appears between the valve rod and the packing, which causes medium leakage. SUMMARY

[0004] The utility model aims at overcoming the shortcomings and deficiencies of the prior art and provides a flat gate valve of zero leakage of upper seal.

[0005] A flat gate valve of zero leakage of upper seal, comprising a valve cover, a valve body, a medium flow channel, a valve seat, a valve rod and a valve plate fixed to the bottom of the valve rod, the valve plate moves in the valve body to control the opening and closing of the medium flow channel, the valve body is provided with a containing cavity, the valve plate comprises an upper sealing part extending into the containing cavity, and the end face of the upper sealing part abuts against the inner wall of the containing cavity to form a sealing connection. The abutment of the end face of the upper sealing part and the inner wall of the containing cavity prevents the medium from leaking to the valve rod. The design cancels the upper sealing sleeve and a large amount of packing, changes the form of the conventional gate plate, and designs the structure of the combination of upper sealing and valve seat sealing. The upper sealing effect is achieved by using a wear-resistant O-shaped ring, which reduces the dead pressure packing and the excessive torque caused by the transition sealing between the valve rod and the packing. At the same time, the gap between the valve rod and the packing after a period of use is overcome, and the possibility of medium leakage from the valve rod is reduced.

[0006] Preferably, the upper sealing part comprises a connecting arm arranged in an inclined manner, and the connecting arm is connected with a sealing end abutting against the inner wall of the containing cavity. The connecting arm arranged in an inclined manner can better fit the inner wall of the containing cavity, ensure the formation of an effective contact surface between the sealing end and the cavity wall, and thus significantly improve the sealing performance and prevent liquid or gas leakage. The inclined design of the connecting arm can effectively disperse the stress applied to the sealing end, reduce the local excessive stress concentration, reduce the leakage risk, and prolong the service life of the sealing element.

[0007] Further, at least one first sealing groove is arranged on the sealing end, and a wear-resistant O-shaped sealing ring is arranged in the first sealing groove to seal the inner wall of the accommodating cavity. The first sealing groove provides an effective accommodating space, so that the O-shaped sealing ring can better abut against the inner wall of the accommodating cavity, thereby improving the sealing integrity and preventing liquid or gas leakage. The use of the wear-resistant O-shaped sealing ring can effectively resist wear and corrosion, prolong the service life of the sealing element, and reduce the maintenance cost and downtime caused by frequent replacement of the sealing element. Due to the elastic and flexible properties of the O-shaped sealing ring, it can adapt to slight irregularities and deformations in the accommodating cavity, ensuring that the sealing effect remains stable under different operating conditions (such as temperature and pressure changes). The arrangement of the first sealing groove on the sealing end provides design space for subsequent further addition of sealing grooves (such as a second sealing groove), forming multiple sealing protection and further enhancing the sealing effect.

[0008] Preferably, at least one second sealing groove is arranged on the inner wall of the valve cover, and an O-shaped sealing ring is arranged in the second sealing groove to seal and connect with the valve stem. The combination of the second sealing groove and the O-shaped sealing ring provides an additional sealing mechanism to effectively prevent leakage during the operation of the valve stem, ensuring more reliable sealing performance of the system. The sealing design between the valve stem and the valve cover significantly reduces the risk of leakage through double sealing measures, improves the overall safety of the system, provides an additional sealing interface, and forms a multiple sealing mechanism, which can effectively avoid the possibility of single sealing failure, thereby providing higher safety protection for the system.

[0009] Further, a third sealing groove is arranged on the top of the valve body, and a middle winding gasket is arranged in the third sealing groove to seal and connect with the valve cover. The combination of the third sealing groove and the middle winding gasket provides a stronger sealing effect, ensuring that the connection between the valve cover and the valve body can effectively prevent the leakage of liquid or gas, and improving the sealing performance of the system. The middle winding gasket has excellent elasticity and plasticity, which can adapt to deformation under extreme working conditions such as high temperature and high pressure, ensuring that the sealing effect remains consistent under various operating conditions. The design of the middle winding gasket enables it to withstand higher compression load, thereby effectively resisting external pressure during valve operation, preventing sealing failure, and ensuring the safety and stability of the system.

[0010] Further, the side wall of the valve cover is provided with a balance hole communicating with the accommodating cavity, and a screw plug is detachably connected in the balance hole. Through the balance hole communicating with the accommodating cavity, gas or vacuum that may be formed in the cavity can be effectively removed, avoiding the occurrence of gas locking phenomenon, thereby ensuring the normal flow of fluid. By detachably connecting the screw plug, the pressure in the valve can be conveniently adjusted or the medium can be injected and discharged when needed, increasing the operation flexibility and convenience of the system.

[0011] Preferably, the valve cover top is provided with a mounting groove around the outer part of the valve stem, the mounting groove is filled with graphite, the valve stem is provided with a shaft sleeve fixedly connected with the valve cover, and the bottom of the shaft sleeve extends into the mounting groove and is in pressure contact with the graphite in the mounting groove. As a good solid lubricant, graphite can effectively reduce the friction between the valve stem and the shaft sleeve, thereby improving the stability of the action, ensuring the flexible operation of the valve, reducing wear and energy consumption. And can provide fireproof effect.

[0012] Preferably, the valve seat is provided with soft sealing or hard sealing. The selection of soft sealing and hard sealing enables the valve to be applicable to different working conditions and media. For example, soft sealing is generally suitable for low pressure and high sealing occasions, while hard sealing is suitable for high pressure and high temperature environment, providing a wider range of applications.

[0013] The beneficial effects of the utility model are as follows: the design cancels the upper sealing sleeve, a large number of fillers, changes the form of conventional gate plate, is designed into the structure of upper sealing and valve seat sealing combined sealing, reaches the upper sealing effect with wear-resistant O-shaped ring, reduces the problem of excessive torque caused by dead pressure filler and transition sealing of the valve stem, and also overcomes the gap between the valve stem and the filler after a period of use, reduces the possibility of medium leakage from the valve stem. BRIEF DESCRIPTION OF DRAWINGS

[0014] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings obtained according to these drawings without creative labor still belong to the scope of the utility model.

[0015] Figure 1 It is the main structure diagram of the utility model;

[0016] Figure 2 It is Figure 1 The enlarged detail view of A in the middle;

[0017] Figure 3 It is Figure 1 The enlarged detail view of B in the middle;

[0018] Figure 4 It is the structure diagram of the side of the utility model;

[0019] In the diagram, 1. Valve cover; 11. Second sealing groove; 12. O-ring seal; 13. Balance hole; 14. Plug; 17. Mounting groove; 18. Graphite; 2. Valve body; 21. Medium flow channel; 22. Receiving cavity; 23. Third sealing groove; 24. Middle spiral wound gasket; 3. Valve seat; 4. Valve stem; 5. Bushing; 6. Valve plate; 61. Upper sealing part; 62. Connecting arm; 63. Sealing end; 64. First sealing groove; 65. Wear-resistant O-ring seal. Detailed Implementation

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

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

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

[0023] like Figures 1-4 The illustration shows an embodiment of a zero-leakage flat gate valve with an upper seal according to this invention. It includes a valve cover 1, a valve body 2, a medium flow channel 21, a valve seat 3, a valve stem 4, and a valve plate 6 fixed to the bottom of the valve stem 4. The valve plate 6 moves within the valve body 2 to control the opening and closing of the medium flow channel 21. The valve body 2 has a receiving cavity 22. The valve plate 6 includes an upper sealing portion 61 extending into the receiving cavity 22. The end face of the upper sealing portion 61 abuts against the inner wall of the receiving cavity 22 to form a sealing connection. The abutment between the end face of the upper sealing portion 61 and the inner wall of the receiving cavity 22 prevents medium leakage to the valve stem 4. This design eliminates the upper sealing sleeve and a large amount of packing, changing the conventional gate valve form. It is designed as a structure combining the upper seal and the valve seat 3 seal, using a wear-resistant O-ring to achieve the upper sealing effect. This reduces the problem of excessive torque caused by dead pressure packing and the transition seal with the valve stem 4, and also overcomes the gap that appears between the valve stem 4 and the packing after a period of use, reducing the possibility of medium leakage from the valve stem 4.

[0024] The upper sealing part 61 comprises a connecting arm 62 arranged in an inclined manner, and the connecting arm 62 is connected with a sealing end 63 abutting against the inner wall of the accommodating cavity 22. The connecting arm 62 arranged in an inclined manner can better fit the inner wall of the accommodating cavity 22, and ensure that an effective contact surface is formed between the sealing end 63 and the cavity wall, thereby significantly improving the sealing performance and preventing liquid or gas leakage. The inclined design of the connecting arm 62 can effectively disperse the stress applied to the sealing end 63, reduce the local excessive stress concentration, reduce the risk of leakage, and prolong the service life of the sealing element.

[0025] The sealing end 63 is provided with at least one first sealing groove 64, and the first sealing groove 64 is provided with a wear-resistant O-shaped sealing ring 6512 for sealing the inner wall of the accommodating cavity 22. The existence of the first sealing groove 64 provides an effective accommodating space, so that the O-shaped sealing ring 12 can better abut against the inner wall of the accommodating cavity 22, thereby improving the integrity of the sealing and preventing liquid or gas leakage. The use of the wear-resistant O-shaped sealing ring 12 can effectively resist wear and corrosion, prolong the service life of the sealing element, and reduce the maintenance cost and downtime caused by frequent replacement of the sealing element. Due to the elastic and flexible properties of the O-shaped sealing ring 12, it can adapt to slight unevenness and deformation in the accommodating cavity 22, and ensure that the sealing effect remains stable under different working conditions (such as temperature and pressure changes). The provision of the first sealing groove 64 on the sealing end 63 can provide design space for further increasing the sealing groove (such as the second sealing groove), form multiple sealing protection, and further enhance the sealing effect.

[0026] The inner wall of the valve cover 1 is provided with at least one second sealing groove 11, and the second sealing groove 11 is provided with an O-shaped sealing ring 12 for sealing connection with the valve stem 4. The combination of the second sealing groove 11 and the O-shaped sealing ring 12 provides an additional sealing mechanism, effectively preventing leakage of the valve stem 4 during operation, and ensuring that the sealing performance of the system is more reliable. The sealing design between the valve stem 4 and the valve cover 1 significantly reduces the risk of leakage through double sealing measures, improves the overall safety of the system, provides an additional sealing interface, forms a multiple sealing mechanism, and can effectively avoid the possibility of single sealing failure, thereby providing higher safety protection for the system.

[0027] The third sealing groove 23 is provided on the top of the valve body 2, and a middle winding gasket 24 is arranged in the third sealing groove 23 for sealing connection with the valve cover 1. The combination of the third sealing groove 23 and the middle winding gasket 24 provides a stronger sealing effect, ensuring that the connection between the valve cover 1 and the valve body 2 can effectively prevent leakage of liquid or gas, and improving the sealing performance of the system. The middle winding gasket 24 has excellent elasticity and plasticity, and can adapt to deformation under extreme working conditions such as high temperature and high pressure, ensuring that the sealing effect remains consistent under various operating conditions. The design of the middle winding gasket 24 enables it to withstand higher compression load, thereby effectively resisting external pressure during valve operation, preventing sealing failure, and ensuring system safety and stability.

[0028] The side wall of the valve cover 1 is provided with a balance hole 15 communicating with the accommodating cavity 22, and a screw plug 16 is detachably connected in the balance hole 15. Through the balance hole 15 communicating with the accommodating cavity 22, the gas or vacuum that may be formed in the cavity can be effectively discharged, avoiding the occurrence of gas locking phenomenon, thereby ensuring the normal flow of fluid. Through the detachable screw plug 16, the pressure in the valve can be conveniently adjusted or the medium can be injected and discharged when needed, increasing the operation flexibility and convenience of the system.

[0029] The top of the valve cover 1 is provided with a mounting groove 17 surrounding the outside of the valve stem 4, and graphite 18 is filled in the mounting groove 17. The valve stem 4 is provided with a shaft sleeve 5 fixedly connected with the valve cover 1, and the bottom of the shaft sleeve 5 extends into the mounting groove 17 and is tightly matched with the graphite 18 in the mounting groove 17. As a good solid lubricant, the graphite 18 can effectively reduce the friction between the valve stem 4 and the shaft sleeve 5, thereby improving the stability of the action, ensuring the flexible operation of the valve, reducing wear and energy consumption. And it can provide fireproof effect.

[0030] The valve seat 3 is provided with soft sealing or hard sealing. The selection of soft sealing and hard sealing enables the valve to be applicable to different working conditions and media. For example, soft sealing is usually suitable for low pressure and high sealing occasions, while hard sealing is suitable for high pressure and high temperature environment, providing a wider range of applications.

[0031] The above disclosure is only the preferred embodiment of the utility model, of course, cannot be limited by the scope of the utility model, therefore, the equivalent changes made according to the utility model claims still belong to the scope covered by the utility model.

[0032] Although the utility model has been described with reference to a number of specific embodiments, it should be understood that the utility model is not limited to the disclosed specific embodiments. The utility model is intended to cover various modifications and equivalent arrangements included within the spirit and scope of the appended claims.

Claims

1. A top-seal zero-leak flat slide gate valve characterized by: The valve cover, valve body, medium flow channel, valve seat, valve rod and valve plate fixed to the bottom of the valve rod are included, the valve plate moves in the valve body to control the opening and closing of the medium flow channel, the valve body is provided with a containing cavity, the valve plate includes an upper sealing part extending into the containing cavity, and the end face of the upper sealing part abuts against the inner wall of the containing cavity to form a sealing connection.

2. The top-seal zero-leak flat slide gate valve as claimed in claim 1, characterized in that: The upper sealing part includes an inclined connecting arm, and the connecting arm is connected with a sealing end abutting against the inner wall of the containing cavity.

3. The top-seal zero-leak flat slide gate valve as claimed in claim 2, characterized in that: At least one first sealing groove is arranged on the sealing end, and a wear-resistant O-shaped sealing ring for sealing with the inner wall of the containing cavity is arranged in the first sealing groove.

4. The top-seal zero-leak flat slide gate valve as claimed in claim 1, wherein: At least one second sealing groove is arranged on the inner wall of the valve cover, and an O-shaped sealing ring for sealing connection with the valve rod is arranged in the second sealing groove.

5. The top-seal zero-leak flat slide gate valve as claimed in claim 4, characterized in that: The top of the valve body is provided with a third sealing groove, and a middle winding gasket for sealing connection with the valve cover is arranged in the third sealing groove.

6. The seal tight flat slide gate valve as claimed in claim 1 or 3, wherein: The side wall of the valve cover is provided with a balance hole communicating with the containing cavity, and a screw plug is detachably connected in the balance hole.

7. The top-seal zero-leak flat slide gate valve as claimed in claim 1, wherein: The top of the valve cover is provided with a mounting groove surrounding the outer part of the valve rod, the mounting groove is filled with graphite, the valve rod is provided with a shaft sleeve fixedly connected with the valve cover, and the bottom of the shaft sleeve extends into the mounting groove and is tightly matched with the graphite in the mounting groove.

8. The top-seal zero-leak flat slide gate valve as claimed in claim 1, wherein: The valve seat is provided with soft sealing or hard sealing.

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