A fluid ball valve

Abstract

The present application discloses a fluid ball valve, which includes a valve body, a valve stem and a ball; the valve stem is arranged in the valve body, and the lower end of the valve stem is connected to the ball; the valve body is provided with a first outlet end and a second outlet end, and the first outlet end and the second outlet end are arranged on opposite sides of the valve body; a fastening nut and a first seal are arranged between the valve body and the valve stem, wherein the first seal includes at least one first metal sealing ring and at least one first non-metal sealing ring arranged around the valve stem, and the first metal sealing ring and the first non-metal sealing ring are alternately arranged in the axial direction of the valve stem; and the fastening nut and the first seal are used to seal-connect the valve stem to the valve body. This fluid ball valve can effectively improve the sealing performance, corrosion resistance, wear resistance, low temperature resistance and other characteristics of the ball valve.

Description

Technical Field

[0001] This application relates to the technical field of mechanical design, and particularly to a fluid ball valve. Background Art

[0002] A ball valve is a valve in which the closing member (ball) is driven by a valve stem and rotates around the axis of the ball valve. Due to its small size, simple structure, convenient operation, wide application range and other characteristics, the ball valve is widely used in fluid pipelines in various industries, mainly for cutting off, distributing and changing the flow direction of the medium.

[0003] However, since the ball valve uses a sphere as the closing member and has a large and frequent rotation angle, it has high requirements for the internal sealing material and sealing structure. Therefore, the common ball valves on the market at present are all used for general working media such as water, solvents, acids and gases. The common ball valves at present mainly have the following disadvantages: First, the connection method is single. Usually, a single ball valve has only one connection method. For example: thread, flange, welding, etc. Because its port and the valve body are integrally processed, ball valves with different connection methods must use different valve bodies to meet the requirements, which not only increases the production cost but also reduces the production efficiency. Second, the position of the connection is fixed and cannot meet the use in special situations. The connection port of the conventional ball valve and the valve body are integrated, so the position is fixed and cannot be adjusted. If the pipeline connected to it wants to adjust the orientation, it is almost impossible to achieve. Third, due to the use of relatively common sealing materials and its not very tight sealing structure in the conventional ball valve, internal leakage and external leakage often occur when low-temperature media are introduced.

[0004] Therefore, there is an urgent need in this field to develop a fluid ball valve to overcome the disadvantages of the ball valves in the prior art and effectively improve the sealing performance, corrosion resistance, wear resistance, low-temperature resistance and other characteristics of the ball valve. Summary of the Invention

[0005] The purpose of this application is to provide a fluid ball valve. Through a special sealing structure design, the fluid ball valve can be used not only for general media but also for ultra-low temperature media such as liquefied natural gas and liquid nitrogen, effectively enhancing the sealing performance of the ball valve and improving its corrosion resistance, wear resistance, low-temperature resistance and other characteristics.

[0006] The present invention provides a fluid ball valve, which is characterized by comprising: a valve body, a valve stem and a sphere; the valve stem is arranged in the valve body, and the lower end of the valve stem is connected to the sphere; the valve body is provided with a first outlet end and a second outlet end, and the first outlet end and the second outlet end are arranged on opposite sides of the valve body;

[0007] A fastening nut and a first seal are provided between the valve body and the valve stem. Among them, the first seal includes at least one first metal seal ring and at least one first non-metal seal ring arranged around the valve stem, and the first metal seal ring and the first non-metal seal ring are alternately arranged in the axial direction of the valve stem; and the fastening nut and the first seal are used to sealingly connect the valve stem to the valve body.

[0008] In another preferred example, the fastening nut is used to compress the first seal to form a sealing structure.

[0009] In another preferred example, the first seal includes 1 - 8 first metal seal rings and 1 - 8 first non-metal seal rings.

[0010] In another preferred example, the material of the first metal seal ring is copper or copper alloy.

[0011] In another preferred example, the material of the first non-metal seal ring is polytetrafluoroethylene.

[0012] In another preferred example, a main seal is provided between the inner surface of the valve body and the outer surface of the sphere. The ball valve further includes an elastic compensation valve cap mechanism, which is arranged at the first outlet end of the valve body and is connected to the first connecting pipe through cooperation with the fastening nut at the first outlet end.

[0013] Among them, the outer side of the proximal end of the elastic compensation valve cap mechanism is threadedly connected to the inner side of the first outlet end of the valve body, and the inner side of the distal end of the elastic compensation valve cap mechanism is threadedly connected to the outer side of the fastening nut at the first outlet end.

[0014] And, the proximal end of the elastic compensation valve cap mechanism is provided with a first elastic compensation flange extending inward. When the assembly is completed, the outer surface of the first elastic compensation flange abuts against the outer surface of the main seal, and the first elastic compensation flange undergoes a first elastic deformation towards the distal end of the elastic compensation valve cap mechanism; and when the low temperature causes the main seal to shrink, the first elastic deformation is partially released, thereby compensating for the gap between the first elastic compensation flange and the main seal, so that the elastic compensation valve cap mechanism and the main seal remain sealed.

[0015] In another preferred example, a second elastic compensation flange extending inward is further provided at the proximal end of the elastic compensation valve cap mechanism. When the assembly is completed, the outer surface of the second elastic compensation flange abuts against the end face of the proximal end of the first connecting pipe, and the second elastic compensation flange undergoes a second elastic deformation toward the proximal end of the elastic compensation valve cap mechanism; and when the low temperature causes the first connecting pipe to contract, the second elastic deformation is partially released, thereby compensating for the gap between the second elastic compensation flange and the first connecting pipe, so that the elastic compensation valve cap mechanism and the first connecting pipe remain sealed.

[0016] In another preferred example, a radial trapezoidal groove is machined on the inner circumference at the proximal end of the elastic compensation valve cap mechanism, thereby forming the first elastic compensation flange and the second elastic compensation flange.

[0017] In another preferred example, the first elastic compensation flange and the second elastic compensation flange are arranged from the proximal end to the distal end.

[0018] In another preferred example, both the first elastic compensation flange and the second elastic compensation flange are annular flanges.

[0019] In another preferred example, a first annular protrusion is provided at the non-threaded part of the outer circumference of the elastic compensation valve cap mechanism, and the first annular protrusion is in interference fit with the inner circumferential surface of the valve body.

[0020] In another preferred example, the connection method of the second outlet end is the same as or different from that of the first outlet end.

[0021] In another preferred example, the connection method of the second outlet end is different from that of the first outlet end. The second outlet end is provided with a second connecting pipe and a second outlet end fastening nut, and the second outlet end is directly and sealingly connected to the valve body through the second connecting pipe and the second outlet end fastening nut.

[0022] In another preferred example, the first connecting pipe and / or the second connecting pipe is replaceable.

[0023] In another preferred example, the first connecting pipe and / or the second connecting pipe can rotate freely.

[0024] In another preferred example, a second metal sealing ring is provided between the first connecting pipe and the elastic compensation valve cap mechanism, and / or a second metal sealing ring is provided between the second connecting pipe and the valve body.

[0025] In another preferred example, the material of the second metal sealing ring is copper or copper alloy.

[0026] In another preferred example, a second annular protrusion is provided on the tight contact surface between the elastic compensation valve cap mechanism and / or the valve body and the second metal sealing ring.

[0027] In another preferred embodiment, the distal end of the elastic compensating valve bonnet mechanism includes an outer annular flange extending outward, and when the elastic compensating valve bonnet mechanism is assembled with the valve body, a third non-metallic sealing ring is provided between the contact between the outer annular flange and the valve body.

[0028] In another preferred embodiment, the material of the third non-metallic sealing ring is polytetrafluoroethylene.

[0029] In another preferred example, it further comprises a handle and a handle positioning block, wherein the handle positioning block is arranged at the rear end of the handle.

[0030] Beneficial effects of the present invention

[0031] While maintaining the appearance and operation mode of conventional ball valves as much as possible, the present invention has made many improvements to the internal structure, using a combination of hard and soft seals, and a sealing structure with multiple layers of seals in leak-prone areas. In addition, considering factors such as the easy shrinkage and deformation of seals at low temperatures, the present invention provides a design idea for an elastic compensation mechanism, which greatly improves the leakage in special circulating media. For the design of the outlet end, it only needs to replace the connecting pipe to meet a variety of external connection methods, which not only saves production costs and shortens the production cycle, but also greatly facilitates customer use. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. It should be understood that the drawings described below are only some implementation examples of the present invention, and ordinary technicians in this field can also obtain other implementation examples based on these drawings without paying creative work.

[0033] Figure 1 is a three-dimensional schematic diagram of a ball valve according to an embodiment of the present application;

[0034] Figure 2 is a schematic structural diagram of a ball valve according to an embodiment of the present application;

[0035] Figure 3 yes Figure 2 A magnified view of the local structure at section line A;

[0036] Figure 4 yes Figure 2 The enlarged view of the local structure at the section line B shows the schematic diagram of the hard sealing structure of the first outlet end;

[0037] Figure 5 is a schematic structural view of an elastic compensation valve cap mechanism of a ball valve according to an embodiment of the present application; Figure 6 is Figure 5 a partial enlarged structural view at the cutting line C of

[0038] Figure 7 is a side view of a ball valve according to an embodiment of the present application, showing a schematic position of a handle and a positioning block of the ball valve according to an embodiment of the present application;

[0039] FIG. 8 is a schematic diagram of low-temperature creep comparison of different packing methods (first seal structure) according to an embodiment of the present application. Among them, in FIG. 8(a), the first seal includes a first non-metallic sealing ring and a first metallic sealing ring arranged at intervals, and in FIG. 8(b), the first seal is composed of a non-metallic sealing washer.

[0040] In each drawing, each label is as follows:

[0041] 1 - valve body

[0042] 11 - first outlet end

[0043] 12 - second outlet end

[0044] 13 - first connecting pipe

[0045] 14 - second connecting pipe

[0046] 15 - first outlet end fastening nut

[0047] 16 - second outlet end fastening nut

[0048] 18 - second metallic sealing ring

[0049] 2 - valve stem

[0050] 3 - sphere

[0051] 4 - fastening nut

[0052] 5 - first seal

[0053] 51 - first metallic sealing ring

[0054] 52 - first non-metallic sealing ring

[0055] 6 - main seal

[0056] 7 - elastic compensation valve cap mechanism

[0057] 71 - first elastic compensation flange

[0058] 711 - outer surface of the first elastic compensation flange

[0059] 72 - second elastic compensation flange

[0060] 73 - Trapezoidal groove

[0061] 74 - Outer annular flange

[0062] 75 - First annular protrusion

[0063] 76 - Second annular protrusion

[0064] 8 - Third non - metallic sealing ring

[0065] 9 - Handle

[0066] 91 - Handle positioning block Detailed implementation mode

[0067] Through extensive and in - depth research, the inventor has developed a fluid ball valve for the first time. The present invention designs a tight sealing structure, uses a combination of soft sealing and hard sealing, and adopts special sealing materials, improving its corrosion resistance, wear resistance, low - temperature resistance and other characteristics. It not only makes up for the common problems of ball valves, but also expands their scope of use. The present invention basically follows the basic appearance of ball valves, making it easier for customers to accept and operate conveniently.

[0068] In the following description, many technical details are presented for the reader to better understand the present application. However, those of ordinary skill in the art can understand that even without these technical details and various changes and modifications based on the following embodiments, the technical solutions claimed in the present application can still be implemented.

[0069] Terms

[0070] As used herein, the terms "proximal end" and "distal end" refer to when the fluid ball valve of the present application is assembled, the end "close to the center of the sphere" is called the "proximal end", and the end "far from the center of the sphere" is called the "distal end".

[0071] The term "comprising", "including" or any other variant thereof is intended to cover non - exclusive inclusion, such that a process, method, article or device comprising a series of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article or device. Without further limitation,

[0072] In the present invention, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations.

[0073] In the present invention, all directional indications (such as up, down, left, right, front, back, etc.) are only used to explain the relative positional relationship, movement conditions, etc. between components in a specific posture (as shown in the attached drawings). If this specific posture changes, the directional indications will also change accordingly.

[0074] The basic working principle of the present invention:

[0075] The ball valve of the present invention functions as a flow divider and is mainly used in pipelines such as liquefied natural gas or liquefied petroleum gas. The valve stem in the middle of the valve body connects the handle at the top and the opening and closing member (sphere) in the middle. When the handle is in the middle position, the two outlets are fully open; when the handle is rotated counterclockwise by 90° or clockwise by 90°, the outlet in the same direction as the handle is closed, and the other outlet remains fully open. There are two limit blocks on the valve body below the handle, and the maximum rotation angle of the handle will not be greater than 180°. In other words, because the sphere has three openings on one side and no opening on the other side, the ball valve has the following three states: (1) the inlet is open, and the two outlets are open; (2) the inlet is open, the first outlet is open, and the second outlet is closed; (3) the inlet is open, the first outlet is closed, and the second outlet is open.

[0076] The present invention has at least the following advantages:

[0077] (a) Through the elastic compensation valve cap mechanism in the ball valve of the present invention, internal leakage caused by the shrinkage and deformation of the main seal at low temperature is avoided;

[0078] (b) In order to prevent the plastic gaskets at the outlet ends of conventional ball valves from shrinking and deforming at low temperature, a hard seal structure is adopted at the two outlet ends of the present invention, and different connection methods at the two outlet ends reduce the contact area and correspondingly increase the pressure, effectively preventing leakage;

[0079] (c) In order to effectively relieve the shrinkage and deformation of the packing at low temperature, the packing between the valve stem and the valve body of the ball valve of the present invention is arranged in an alternating manner of non-metallic seals and metal seals, reducing the volume of the non-metallic seals, and the shrinkage ratio is also correspondingly reduced. Moreover, the small-volume non-metallic seals are more likely to deform after being squeezed by the fastening nuts, and can better fill the gap between the valve stem and the valve body to prevent leakage;

[0080] (d) The diversity of the connection methods at the outlet ends of the ball valve of the present invention does not require changing the valve body, and only the connection pipe of the ball valve of the present invention needs to be replaced, which is convenient for production and can save costs;

[0081] (e) The outlet connection of the ball valve of the present invention can be rotated, which is convenient for adjusting the direction and position of the external connection pipeline. And in the actual working conditions where the external space is limited and the pipeline cannot be arranged, this problem can be solved by rotating the outlet connection direction, which greatly facilitates the actual use;

[0082] (f) In the present invention, the handle positioning block is located at the rear end of the handle, reducing the occupation of limited space and avoiding the situation where the handle cannot rotate freely in some working environments with narrow spaces.

[0083] To make the objectives, technical solutions, and advantages of the present invention clearer, the following will further describe the embodiments of the present invention in detail with reference to the accompanying drawings.

[0084] Embodiment 1

[0085] This application provides a fluid ball valve. Through a special and ingenious sealing structure design, this fluid ball valve can be used not only for general media but also for cryogenic media such as liquefied natural gas and liquid nitrogen. Figure 1 is a three-dimensional schematic diagram of the ball valve of this application; Figure 2 is a structural schematic diagram of the ball valve of this application.

[0086] As Figure 1-2 shown, the fluid ball valve of this embodiment includes a valve body 1, a valve stem 2, and a ball 3; the valve stem 2 is arranged inside the valve body 1, and the lower end of the valve stem 2 is connected to the ball 3; the valve body 1 is provided with a first outlet end 11 and a second outlet end 12, and the first outlet end 11 and the second outlet end 12 are arranged on opposite sides of the valve body.

[0087] (a) Arrangement of the ball valve packing (the first seal)

[0088] A fastening nut 4 and a first seal 5 (which is the ball valve packing of this application) are arranged between the valve body 1 and the valve stem 2. Among them, the first seal 5 includes at least one first metal seal ring 51 and at least one first non-metal seal ring 52 arranged around the valve stem 2, and the first metal seal ring 51 and the first non-metal seal ring 52 are arranged alternately in the axial direction of the valve stem 2; and the fastening nut 4 and the first seal 6 are used to seal-connect the valve stem 2 to the valve body 1, where the fastening nut 4 is used to compress the first seal 5 to form a sealing structure. The packing of traditional ball valves is integral. Because of its large volume and large shrinkage ratio at low temperatures, leakage is likely to occur. In order to effectively alleviate the shrinkage and deformation of the packing at low temperatures, the packing between the valve stem 2 and the valve body 1 of this application adopts the method of arranging non-metal seals and metal seals at intervals. This ingenious setting reduces the volume of the non-metal seal, and the shrinkage ratio is also correspondingly reduced. Moreover, the small-volume non-metal seal is more likely to deform after being squeezed by the fastening nut 4, and can better fill the gap between the valve stem 2 and the valve body 1 to prevent leakage. In this embodiment, the material of the first metal seal ring is copper or copper alloy, and the material of the first non-metal seal ring is polytetrafluoroethylene. In one embodiment, the first seal 5 may include 1-8 first metal seal rings and 1-8 first non-metal seal rings.

[0089] In this application, the inventor presents the low-temperature creep of different packing methods as follows:

[0090] As Figure 8(a)-8(b) shown, where Fig. 8(a) is a schematic diagram of the first seal including first non-metallic sealing rings and first metal sealing rings arranged at intervals, with 5 first non-metallic sealing rings and 5 first metal sealing rings; Fig. 8(b) is a comparative example of Fig. 8(a), where the first seal is composed of a non-metallic sealing washer.

[0091] Axial comparison: Assume that the height of the entire packing (first seal) is 10 mm, and the shrinkage rate of the non-metallic sealing ring at low temperature is 10% (10% is only a reference value). If the spaced arrangement is adopted, the thickness of the first non-metallic sealing ring is only 5 mm, and the overall shrinkage is only 0.5 mm. If a whole non-metallic sealing ring (with a thickness of 10 mm) is used, the shrinkage is 1 mm, and leakage is more likely to occur.

[0092] Radial comparison: 1. The packing (first seal) is located between the valve stem 2 and the valve body 1. Through the extrusion of the upper fastening nut 4, the packing undergoes radial deformation, so as to be in close contact with the valve stem and the valve body, playing a sealing role. If it is a whole non-metallic sealing ring, the volume is large. Under the same extrusion force, the radial deformation may be only 0.1 mm. By adopting the spaced arrangement, the volume of the first non-metallic sealing ring is reduced, and it is more likely to deform under the action of pressure, and a deformation of 0.2 mm may occur. 2. Assume that the outer diameter of the packing is 12 mm and the shrinkage rate is still 10%. For the whole non-metallic sealing ring, the outer diameter shrinks by 1.2 mm as a whole at low temperature. Once leakage occurs, the entire packing will fail. However, if the spaced arrangement is adopted, 5 small first non-metallic sealing rings are equivalent to 5 seals. Even if some of the first non-metallic sealing rings shrink and fail, there are still remaining sealing rings that can function.

[0093] It can be seen that by adopting the method of arranging non-metallic seals and metal seals at intervals, this ingenious setting reduces the volume of the non-metallic seals, and the small-volume non-metallic seals are more likely to deform after being extruded by the fastening nut 4, and can better fill the gap between the valve stem 2 and the valve body 1 to prevent leakage.

[0094] (b) Connection of the valve cap compensation mechanism to the first outlet end

[0095] As Figure 2 and 5As shown, in order to place the sphere 3 into the valve body 1, a large-diameter hole (the first outlet end 11 in this application) is machined on one side of the valve body 1. After the sphere and the packing are placed into the valve body, it is connected to this hole (machined with threads) through the elastic compensation valve cap mechanism 7, that is, the elastic compensation valve cap mechanism 7 cooperates with the valve body 1, and is connected to the first outlet end 11 connected to the valve body 1, and is connected to the first connection pipe 13 by cooperating with the fastening nut 15 of the first outlet end; the outer side of the proximal end of the elastic compensation valve cap mechanism 7 is threadedly connected to the inner side of the first outlet end 11 of the valve body 1, and the inner side of the distal end of the elastic compensation valve cap mechanism 7 is threadedly connected to the outer side of the fastening nut 15 of the first outlet end.

[0096] A main seal 6 is provided between the inner surface of the valve body 1 and the outer surface of the sphere 3. In order to avoid internal leakage caused by the shrinkage and deformation of the main seal 6 at low temperature, when the valve body 1 and the elastic compensation valve cap mechanism 7 are assembled, the elastic compensation valve cap mechanism 7 is arranged at the first outlet end 11 and is used to squeeze the main seal 6. The proximal end of the elastic compensation valve cap mechanism 7 is provided with a first elastic compensation flange 71 extending inward. When the assembly is completed, the outer surface 711 of the first elastic compensation flange abuts against the outer surface of the main seal 6, and the first elastic compensation flange 71 undergoes a first elastic deformation towards the distal end of the elastic compensation valve cap mechanism 7; and when the low temperature causes the main seal 6 to shrink, the first elastic deformation is partially released, thereby compensating for the gap between the first elastic compensation flange 71 and the main seal 6, so that the elastic compensation valve cap mechanism 7 and the main seal 6 remain sealed;

[0097] The proximal end of the elastic compensation valve cap mechanism 7 is also provided with a second elastic compensation flange 72 extending inward. When the assembly is completed, the outer surface of the second elastic compensation flange 72 abuts against the end surface of the proximal end of the first connection pipe 13, and the second elastic compensation flange 72 undergoes a second elastic deformation towards the proximal end of the elastic compensation valve cap mechanism 7; and when the low temperature causes the first connection pipe 13 to shrink, the second elastic deformation is partially released, thereby compensating for the gap between the second elastic compensation flange 72 and the first connection pipe 13, so that the elastic compensation valve cap mechanism 7 and the first connection pipe 13 remain sealed.

[0098] Among them, the first elastic compensation flange 71 and the second elastic compensation flange 72 are both annular flanges. The first elastic compensation flange 71 and the second elastic compensation flange 72 are formed by machining a radial trapezoidal groove 73 on the inner circumference of the proximal end of the elastic compensation valve bonnet mechanism 7, which provides space for the deformation of the elastic compensation valve bonnet mechanism 7 itself. In other words, when the outer end surface of the elastic compensation valve bonnet mechanism applies pressure to the internal main seal 6, under the influence of the reaction force, the elastic compensation valve bonnet mechanism 7 itself will also be squeezed and deformed (the outer surface 711 of the first elastic compensation flange 71 produces elastic deformation in the direction of the trapezoidal groove 73). When the low-temperature medium passes through the interior of the present invention, the main seal 6 will undergo slight shrinkage deformation. At this time, a very small fitting gap will appear between the main seal and the elastic compensation valve bonnet mechanism 7. The outer surface 711 of the first elastic compensation flange releases pressure in the direction of the main seal 6 under its own elastic action, making up for the fitting gap caused by the contraction of the main seal 6, ensuring that the main seal 6 and the ball 3 are still in close contact and no leakage occurs.

[0099] like Figure 5 and 6 As shown, there is a first annular protrusion 75 on the outer circumference (non-threaded) of the elastic compensation valve cap mechanism 7, and the first annular protrusion 75 is interference-fitted with the inner circumferential surface of the valve body 1 to play a sealing role. After precise dimensional calculation, the resistance generated by the interference fit here does not affect the axial movement between the valve body and the elastic compensation valve cap mechanism 7, preventing the occurrence of jamming.

[0100] like Figure 3 As shown, the distal end of the elastic compensation bonnet mechanism 7 further includes an outer annular flange 74 extending outward. When the elastic compensation bonnet mechanism 7 is assembled with the valve body 1, a third non-metallic sealing ring 8 is provided between the contact between the outer annular flange 74 and the valve body 1. The material of the third non-metallic sealing ring is polytetrafluoroethylene. In other words, when the valve body 1 is matched with the elastic compensation bonnet mechanism 7, the third non-metallic sealing ring 8 is squeezed and deformed, filling the matching gap, and effectively preventing leakage between the valve body 1 and the elastic compensation bonnet mechanism 7.

[0101] (c) Connection of the first outlet port / the second outlet port

[0102] like Figure 1-6As shown, in the embodiments of the present invention, since the first and second outlet ends are in direct contact with the circulating medium, in order to prevent the non-metallic gasket (such as a plastic gasket) from shrinking and deforming at low temperatures, a hard-sealed structure is adopted at the first and second outlet ends. Due to design requirements, the connection methods of the first and second outlet ends are different. In order to place the sphere 3 into the valve body 1, a large-diameter hole is machined on one side of the valve body 1, and the elastic compensation valve cap mechanism 7 is connected to this hole (the first outlet end) (threaded). That is to say, one end of the valve body 1 is connected to the elastic compensation valve cap mechanism through a connecting pipe and a fastening nut, and the other end is directly connected to the valve body through a connecting pipe and a fastening nut. Specifically, the elastic compensation valve cap mechanism 7 is arranged at the first outlet end 11 of the valve body 1 and connects the first outlet end 11 and the first connecting pipe 13 by cooperating with the first outlet end fastening nut 15. Among them, the outer side of the proximal end of the elastic compensation valve cap mechanism 7 is threadedly connected to the inner side of the first outlet end 11 of the valve body, and the inner side of the distal end of the elastic compensation valve cap mechanism 7 is threadedly connected to the outer side of the first outlet end fastening nut 15; the second outlet end 12 is provided with a second connecting pipe 14 and a second outlet end fastening nut 16, and the second outlet end 12 is directly sealed and connected to the valve body 1 through the second connecting pipe 14 and the second outlet end fastening nut 16.

[0103] Moreover, a second metal gasket 18 is placed between the first connecting pipe 13 and the elastic compensation valve cap mechanism 7 and between the second connecting pipe 14 and the valve body 1. In this embodiment, the second metal gasket 18 is a brass gasket. Then, on the valve body 1 and the elastic compensation valve cap mechanism 7, a second annular protrusion 76 is designed on the end face in contact with the brass gasket. When the second annular protrusion 76 contacts the brass gasket 18, the contact area is reduced, and the pressure becomes larger accordingly, effectively preventing leakage. In other embodiments, the connection methods of the first and second outlet ends can also be the same. In addition, threads identical to those of the second outlet end can be machined at the rear end of the elastic compensation valve cap mechanism 7 so that the threads of both ends (the first and second outlet ends) are the same, and then the same connecting pipes and fastening nuts can be used.

[0104] In this application, not only is the connection method of the outlet diverse, but also the valve body does not need to be changed. The outlet end is composed of a connecting pipe and a fastening nut. The connecting pipe itself does not have a fastening function and is fixed by the fastening nut. Therefore, the connecting pipe is replaceable. The end of the connecting pipe can be machined according to customer requirements to meet various connection methods such as threads, flanges, and welding. Only by replacing the connecting pipe can it be convenient for production and save costs.

[0105] In addition, the outlet connection can be rotated, which facilitates the adjustment of the direction and position of the external connection pipeline. Since the external pipeline is connected to the outlet end connecting pipe of the present invention, and the outlet end connecting pipe is fixed by a fastening nut, only by loosening the fastening nut, the connecting pipe can rotate freely. If the external space is limited and the pipeline cannot be arranged in the actual working condition, this problem may be solved by rotating the direction, which greatly facilitates the actual use.

[0106] (d) Setting of the handle positioning block

[0107] As Figure 7 shown, in this embodiment, the handle positioning block is located at the rear end of the handle, reducing the occupation of limited space. Usually, the positioning block of the ball valve handle is located at the front end, which will affect the free rotation of the handle in some working environments with narrow spaces. The present invention designs the handle positioning block at the rear end to avoid this situation as much as possible.

[0108] All documents mentioned in this application are considered to be integrally included in the disclosure content of this application so that they can be used as the basis for modification when necessary. In addition, it should be understood that after reading the above disclosure content of this application, those skilled in the art can make various changes or modifications to this application, and these equivalent forms also fall within the scope claimed by this application.

Claims

1. A fluid ball valve, characterized in that, Comprising: A valve body (1), a valve stem (2) and a sphere (3); the valve stem (2) is arranged inside the valve body (1), and the lower end of the valve stem (2) is connected to the sphere (3); the valve body (1) is provided with a first outlet end (11) and a second outlet end (12), and the first outlet end (11) and the second outlet end (12) are arranged on opposite sides of the valve body (1); A fastening nut (4) and a first seal (5) are provided between the valve body (1) and the valve stem (2), wherein the first seal (5) includes at least one first metal seal ring (51) and at least one first non-metal seal ring (52) arranged around the valve stem, and the first metal seal ring (51) and the first non-metal seal ring (52) are arranged alternately in the axial direction of the valve stem (2); and the fastening nut (4) and the first seal (5) are used to seal-connect the valve stem (2) to the valve body (1); A main seal (6) is provided between the inner surface of the valve body (1) and the outer surface of the sphere (3), and the ball valve further includes an elastic compensation valve cap mechanism (7), and the elastic compensation valve cap mechanism (7) is arranged at the first outlet end (11) of the valve body (1); Wherein, the proximal end of the elastic compensation valve cap mechanism (7) is provided with a first elastic compensation flange (71) extending inward. When the assembly is completed, the outer surface of the first elastic compensation flange (71) abuts against the outer surface of the main seal (6), and the first elastic compensation flange (71) undergoes a first elastic deformation towards the distal end of the elastic compensation valve cap mechanism (7); and when low temperature causes the main seal (6) to shrink, the first elastic deformation is partially released, thereby compensating for the gap between the first elastic compensation flange (71) and the main seal (6), so that the elastic compensation valve cap mechanism (7) and the main seal (6) remain sealed.

2. The ball valve according to claim 1, wherein, The elastic compensation valve cap mechanism (7) is connected to the first outlet end (11) and the first connecting pipe (13) by cooperating with a first outlet end fastening nut (15); The outer side of the proximal end of the elastic compensation valve cap mechanism (7) is threadedly connected to the inner side of the first outlet end (11) of the valve body (1), and the inner side of the distal end of the elastic compensation valve cap mechanism (7) is threadedly connected to the outer side of the first outlet end fastening nut (15).

3. The ball valve according to claim 2, characterized in that, The proximal end of the elastic compensation valve cap mechanism (7) is further provided with a second elastic compensation flange (72) extending inward. When the assembly is completed, the outer surface of the second elastic compensation flange (72) abuts against the end face of the proximal end of the first connecting pipe (13), and the second elastic compensation flange (72) undergoes a second elastic deformation towards the proximal end of the elastic compensation valve cap mechanism (7); and when low temperature causes the first connecting pipe (13) to shrink, the second elastic deformation is partially released, thereby compensating for the gap between the second elastic compensation flange (72) and the first connecting pipe (13), so that the elastic compensation valve cap mechanism (7) and the first connecting pipe (13) remain sealed.

4. The ball valve according to claim 3, characterized in that, A radial trapezoidal groove (73) is machined on the inner circumference of the proximal end of the elastic compensation valve cap mechanism (7), thereby forming the first elastic compensation flange (71) and the second elastic compensation flange (72).

5. The ball valve according to claim 1, characterized in that, The connection mode of the second outlet end (12) is the same as or different from that of the first outlet end (11).

6. The ball valve according to claim 2, wherein The connection mode of the second outlet end (12) is different from that of the first outlet end (11). The second outlet end (12) is provided with a second connecting pipe (14) and a second outlet end fastening nut (16). The second outlet end (12) is directly and sealingly connected to the valve body (1) through the second connecting pipe (14) and the second outlet end fastening nut (16).

7. The ball valve according to claim 6, characterized in that, A second metal sealing ring (18) is provided between the first connecting pipe (13) and the elastic compensation valve cap mechanism (7), and / or a second metal sealing ring (18) is provided between the second connecting pipe (14) and the valve body (1).

8. The ball valve according to claim 7, wherein A second annular protrusion (76) is provided on the close contact surface between the elastic compensation valve cap mechanism (7) and / or the valve body (1) and the second metal sealing ring (18).

9. The ball valve according to claim 1, wherein The distal end of the elastic compensation valve cap mechanism (7) includes an outwardly extending outer annular flange (74). When the elastic compensation valve cap mechanism (7) is assembled with the valve body (1), a third non-metallic sealing ring (8) is provided between the contact of the outer annular flange (74) and the valve body (1).

10. The ball valve according to claim 1, characterized in that, It further includes a handle (9) and a handle positioning block (91), and the handle positioning block (91) is arranged at the rear end of the handle (9).

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