A super-high temperature ball valve with double circulation cooling flow channels

Abstract

The application provides an ultra-high temperature ball valve with double-circulation cooling flow channels, belonging to the technical field of ball valves, comprising a valve body and a valve cover, wherein the valve body and the valve cover are internally provided with flow channel protection sleeves, respectively forming an inner inlet chamber and an inner outlet chamber, and are externally provided with jacket heat preservation sleeves, respectively forming an outer inlet chamber and an outer outlet chamber; a first flow channel is arranged on the valve body, a second flow channel is arranged on the valve cover, the first flow channel and the second flow channel are communicated with the inner inlet chamber and the inner outlet chamber, water inlet flanges and water outlet flanges are respectively arranged on the valve body and the valve cover, flow channel holes are arranged on the water inlet flanges and the water outlet flanges, and the flow channel holes are respectively communicated with the outer inlet chamber and the inner inlet chamber and the inner outlet chamber and the outer outlet chamber; in the application, the double-circulation flow channels are formed to realize cooling water circulation, the high temperature inside the valve can be quickly and uniformly removed, and the temperature of the fluid can be adjusted to maintain the necessary heat for the process.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ball valves, in particular to an ultra-high temperature ball valve with internal and external double-circulation cooling flow channels. BACKGROUND

[0002] In the industrial fields of petroleum, chemical industry, metallurgy, etc., it is often necessary to handle ultra-high temperature medium, which puts extremely high requirements on the high-temperature resistance and sealing performance of related valve equipment. At present, when the existing ball valves are used in an ultra-high temperature environment, they often face many problems.

[0003] On the one hand, high temperature easily causes the deformation of valve body, valve cover and other components due to heat, affecting the structural stability of the valve; on the other hand, high temperature accelerates the aging of the sealing element, causing the sealing performance to decline and leading to medium leakage. However, the traditional cooling method has poor cooling effect and cannot effectively reduce the temperature of the key components of the valve, greatly shortening the service life of the valve and increasing the equipment maintenance cost and safety hazards. SUMMARY

[0004] The purpose of the present application is to overcome the shortcomings and deficiencies of the prior art and provide an ultra-high temperature ball valve with internal and external double-circulation cooling flow channels.

[0005] The technical solution adopted by the present application is as follows: the present application provides an ultra-high temperature ball valve with internal and external double-circulation cooling flow channels, which comprises a valve body and a valve cover connected together, a flow channel protection sleeve is arranged in the inlet end of the valve body and the outlet end of the valve cover, and an inner inlet chamber and an inner outlet chamber are formed in the valve body and the valve cover, respectively, a jacket heat preservation sleeve is arranged outside the inlet end of the valve body and the outlet end of the valve cover, and an outer inlet chamber and an outer outlet chamber are formed in the valve body and the valve cover, respectively, a first flow channel is arranged on the valve body, a second flow channel is arranged on the valve cover, the inner inlet chamber and the inner outlet chamber are communicated through the first flow channel and the second flow channel, a water inlet flange and a water outlet flange are arranged on the valve body and the valve cover, respectively, flow channel holes are arranged on the water inlet flange and the water outlet flange, and the outer inlet chamber and the inner inlet chamber and the inner outlet chamber and the outer outlet chamber are communicated through the flow channel holes, respectively, forming an internal and external double-circulation cooling flow channel.

[0006] In some embodiments, a first sealing element is arranged between the valve body and the valve cover, and a first through hole is arranged on the first sealing element to communicate the first flow channel and the second flow channel.

[0007] In some embodiments, a gland connected to the valve body is further included, a second sealing element is arranged between the gland and the valve body, a third flow channel is arranged on the gland in the axial direction thereof, and a second through hole is arranged on the second sealing element to communicate the first flow channel and the third flow channel and the second flow channel and the third flow channel.

[0008] In some embodiments, the valve body is provided with a first annular groove in communication with the first flow channel, the valve cover is provided with a second annular groove in communication with the second flow channel, the first annular groove and the second annular groove form a first installation cavity, and the first sealing member is arranged in the first installation cavity.

[0009] In some embodiments, the valve body is provided with a third annular groove in communication with the first flow channel, the valve cover is provided with a fourth annular groove in communication with the second flow channel, the third annular groove and the fourth annular groove form a second installation cavity, and the second sealing member is arranged in the third installation cavity.

[0010] In some embodiments, the first sealing member and the second sealing member each include a sealing ring portion and a flange portion extending from the outer ring and the inner ring of the sealing ring portion, the two sides of the sealing ring portion are provided with a conical surface or a spherical surface, and form a linear seal with the corresponding installation cavity, and the flange portion is pressed between the valve body and the valve cover or the valve body and the valve cover.

[0011] In some embodiments, the valve further comprises a ball;

[0012] An inlet valve seat assembly arranged in the valve body, the inlet valve seat assembly comprising an inlet valve seat, a protective ring, and a disc spring, the protective ring is arranged between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body, the end of the inlet valve seat away from the valve cover is provided with a first sealing plane, and the other end forms a seal with the ball, the valve body is provided with a second sealing plane corresponding to the first sealing plane, and the disc spring is arranged between the valve body and the inlet valve seat and located in the inner ring of the first sealing plane and the second sealing plane;

[0013] and an outlet valve seat assembly arranged in the valve cover, the outlet valve seat assembly comprising a fixed valve seat, a pressing plate, and a screw, the pressing plate presses the fixed valve seat, the screw passes through the pressing plate to fix the fixed valve seat on the valve cover, the head of the screw is welded with the pressing plate, the end of the fixed valve seat away from the valve body is provided with a third sealing plane, and the other end forms a seal with the ball, and the valve cover is provided with a fourth sealing plane in sealing cooperation with the third sealing plane.

[0014] In some embodiments, a gap is arranged between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body.

[0015] In some embodiments, a valve stem is further included, the valve stem comprising a first shaft portion and a second shaft portion, the first shaft portion having a smaller diameter than the second shaft portion, a packing gland is arranged between the first shaft portion and the gland, an upper chamber is formed in the valve body and the gland, positioning shaft portions are arranged on the upper and lower ends of the second shaft portion, the positioning shaft portions have a larger diameter than the second shaft portion, the second shaft portion is limited in the upper chamber by the positioning shaft portions, and a gap is maintained between the second shaft portion and the inner hole of the gland.

[0016] In some embodiments, the gland is provided with cooling fins, a positioning pin is arranged between the gland and the valve body, an incremental flange is connected to the inlet end of the valve body, a metal sealing gasket and a heat insulation ring are arranged between the incremental flange and the valve body, the surface of the heat insulation ring is coated with a heat insulation coating, and the heat insulation ring is located in the inner ring of the metal sealing gasket.

[0017] The beneficial effects of the present application are as follows: in the present application, the internal and external double circulation flow channels are used to realize cooling water circulation, which can quickly and uniformly take away most of the heat from the high temperature inside the valve to reduce the actual contact temperature of the valve internals, and can also adjust the temperature of the circulating water or other fluids to ensure that the medium temperature in the flow channel is not too low to maintain the necessary heat for the process. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings obtained according to these drawings without creative labor are still within the scope of the present application.

[0019] Figure 1 A schematic diagram of a super-high-temperature ball valve with internal and external double circulation cooling flow channels in the present application Figure 1 ;

[0020] Figure 2 A sectional view of the inlet end of a super-high-temperature ball valve with internal and external double circulation cooling flow channels in the present application

[0021] Figure 3 A sectional view of the outlet end of a super-high-temperature ball valve with internal and external double circulation cooling flow channels in the present application

[0022] Figure 4 A sectional view of the position of the first sealing element in the present application

[0023] Figure 5 A sectional view of the position of the second sealing element in the present application

[0024] Figure 6Fig. 1 is a schematic view of an ultra-high temperature ball valve with double-circulation cooling flow channels inside and outside according to the present application Figure 2 ;

[0025] Figure 7 Fig. 2 is an enlarged view of A in Fig. 1 Figure 6

[0026] Figure 8 Fig. 3 is a partial schematic view of an inlet valve seat assembly according to the present application

[0027] Figure 9 Fig. 4 is a partial schematic view of an outlet valve seat assembly according to the present application

[0028] Figure 10 Fig. 5 is an enlarged view of B in Fig. 1 Figure 6

[0029] Figure 11 Fig. 6 is a partial schematic view of a valve stem according to the present application. DETAILED DESCRIPTION

[0030] The following description provides specific applications and requirements of the present specification, and aims to enable those skilled in the art to manufacture and use the contents of the present specification. Various local modifications of the disclosed embodiments are apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of the present specification. Therefore, the present specification is not limited to the embodiments shown, but is consistent with the widest scope of the claims.

[0031] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is based on the orientation or positional relationship shown in the drawings, and these terms are mainly used to better describe the present application and its embodiments, and are not intended to limit the indicated devices, elements or components to have a particular orientation, or to be constructed and operated in a particular orientation.

[0032] It should be noted that the terms "first", "second" and similar words do not indicate any order, quantity or importance, but are only used to distinguish different components, and should not be understood as limiting the embodiments of the present application.

[0033] ​​It should be noted that the terms "mounting", "arrangement", "provided with", "connected", "linked" should be interpreted broadly. For example, it can be fixed connection, detachable connection, or integral structure; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through intermediate media, or internal communication between two devices, elements or components.

[0034] It should be noted that the terms "in some embodiments", "exemplarily", "for example" and the like are used to indicate an example, illustration or description. Any embodiment or design scheme described as "in some embodiments", "exemplarily", "for example" in this application should not be interpreted as more preferred or more advantageous than other embodiments or design schemes. On the contrary, the use of "in some embodiments", "exemplarily", "for example" and the like is intended to present the relevant concept in a specific way, meaning that the specific features, structures or properties described in conjunction with the embodiments can be included in at least one embodiment of the application. The occurrence of the above terms at various places in the specification does not necessarily mean the same embodiment, nor is it an independent or alternative embodiment that is not mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0035] For those of ordinary skill in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0036] With regard to the drawings of the present application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of the specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0037] To solve the problem of poor cooling effect of the existing ball valve under super high temperature working condition, as shown in Figures 1 to 11 The present application provides a super high temperature ball valve with internal and external double circulation cooling flow channels, which comprises a valve body 1, a valve cover 2, a gland 15, a ball 22 and a valve stem 33. The valve body 1 and the valve cover 2 are fixedly connected by bolts and other connecting members to form the main structure of the valve. The gland 15 is connected with the valve body 1. The inlet end of the valve body 1 and the outlet end of the valve cover 2 are provided with flow channel protection sleeves 3, which form internal inlet chamber 4 and internal outlet chamber 5 with the valve body 1 and the valve cover 2 respectively. The flow channel protection sleeves 3 are made of high temperature resistant materials such as ceramics or high temperature alloys. The inside of the flow channel protection sleeves 3 is the valve flow channel, and the size of the flow channel is determined according to the standard of DN100 diameter. The flow channel protection sleeves 3 can directly contact with super high temperature medium to protect the valve body 1 and the valve cover 2 from being directly scoured by high temperature.

[0038] Specifically, the inlet channel of the valve body 1 and the outlet channel of the valve cover are both provided with annular grooves, and the two sides of the flow channel protection sleeve 3 and the two sides of the corresponding annular grooves are welded to form a seal. In this way, by digging annular grooves on the valve body 1 and the valve cover 2 to form cooling chambers, and by using the heat insulation sleeve to isolate the high-temperature medium from the thinned valve body wall and valve cover wall, not only the original size of the valve is not changed, but also the heat transferred to the valve body and the valve cover is reduced. Moreover, the sealing is formed by welding to ensure the reliability and sealing of the connection.

[0039] The valve body 1 and the valve cover 2 are both provided with a jacket heat preservation sleeve 6 outside the inlet end and the outlet end, respectively, and form an outer inlet chamber 7 and an outer outlet chamber 8 with the valve body 1 and the valve cover 2, respectively. The jacket heat preservation sleeve 6 is made of a material with good heat insulation performance, which can reduce heat exchange between the valve and the outside world, and at the same time cooperate with the internal cooling flow channel to enhance the cooling effect.

[0040] The valve body 1 is provided with a first flow channel 9, and the valve cover 2 is provided with a second flow channel 10. The first flow channel 9 and the second flow channel 10 can be designed as annular channels, spiral channels or multiple straight channels, and their specific shape and size can be optimized according to the working temperature of the valve, the medium flow and the required cooling effect. For example, the first flow channel 9 can be arranged along the inner wall or the key heated area of the valve body 1 to maximize the heat exchange efficiency. The two cooperate with each other to connect the inner inlet chamber 4 and the inner outlet chamber 5, forming an internal cooling circulation passage.

[0041] Preferably, the first flow channel 9 and the second flow channel 10 are multiple and the same number.

[0042] In order to introduce and discharge the cooling medium, the valve body 1 and the valve cover 2 are respectively provided with a water inlet flange 11 and a water outlet flange 12. The number of the water inlet flange 11 and the water outlet flange 12 can be one or more. The water inlet flange 11 and the water outlet flange 12 are both provided with flow channel holes 13, which are uniformly arranged in multiple and respectively connected with the outer inlet chamber 7 and the inner inlet chamber 4 and the inner outlet chamber 5 and the outer outlet chamber 8, forming an internal and external double circulation cooling flow channel.

[0043] It can be understood that the water inlet flange 11 includes a flange plate part and a connecting pipe part, the connecting pipe part penetrates the outer inlet chamber 7 and the inner inlet chamber 4 to communicate, and the flow channel hole 13 is arranged on the connecting pipe part and communicates with the outer inlet chamber 7. The water outlet flange 12 is provided in the same structure.

[0044] Through the above setting, the cooling circulating water is introduced into the inner inlet chamber 4 from the water inlet flange 11, and then flows to the inner outlet chamber 5 through the first flow channel 9 and the second flow channel 10, and also flows to the outer inlet chamber 7 and the outer outlet chamber 8 through the flow channel holes 13 respectively, and finally circulates to the external cooling circulating device from the water outlet flange 12.

[0045] Through the circulation of the circulating water in the inner and outer circulating flow channels, most of the heat generated by the high temperature inside the valve can be quickly and uniformly taken away to reduce the actual contact temperature of the valve internals, and at the same time the temperature of the circulating water or other fluids can be adjusted to ensure that the medium temperature in the flow channel does not drop too low to maintain the necessary heat for the process.

[0046] As shown in Figure 4 With Figure 5 As shown, the first seal 14 is arranged between the valve body 1 and the valve cover 2 to prevent internal medium leakage, and the first seal 14 is provided with a first through hole 140 communicating the first flow channel 9 and the second flow channel 10, preferably, the first seal 14 is a metal ring seal, and the number and position of the first through hole 140 can be adjusted according to the structure of the first seal 14, the number of cooling flow channels and cooling requirements, for example, a plurality of uniformly distributed first through holes 140 can be provided to ensure that the cooling medium can flow uniformly through the first seal 14, and the gland 15 is provided with a second seal 16 between the valve body 1 and the gland 15, and the gland 15 is provided with a third flow channel 17 along the axial direction thereof, and the second seal 16 is provided with a second through hole 160, and the second through hole 160 is used to communicate the first flow channel 9 and the third flow channel 17 and the second flow channel 10 and the third flow channel 17.

[0047] Through the above setting, the first seal 14 and the second seal 16 are also involved in the cooling circuit, thereby achieving effective cooling of the key parts of the valve and significantly improving the safety and reliability of the valve in the super-high temperature environment.

[0048] Although the above structure provides cooling flow channels to achieve cooling of the valve body 1, the valve cover 2 and the gland 15, in the super-high temperature working condition, it may be difficult to fully and uniformly take away all the heat generated by the key components such as the valve body 1, the valve cover 2 and the gland 15, especially in the area with high local heat load, there may still be a risk of heat accumulation, thereby affecting the long-term stable operation and sealing performance of the valve.

[0049] To this end, the valve body 1 is provided with a first annular groove 18 communicating with the first flow channel 9 on the connecting side of the valve cover 2, the valve cover 2 is provided with a second annular groove 19 communicating with the second flow channel 10 on the connecting side of the valve body 1, the first annular groove 18 and the second annular groove 19 form a first mounting cavity, the first sealing element 14 is arranged in the first mounting cavity, the valve body 1 is provided with a third annular groove 20 communicating with the first flow channel 9 on the connecting side of the gland 15, the gland 15 is provided with a fourth annular groove 21 communicating with the third flow channel 17 on the connecting side of the valve body 1, the third annular groove 20 and the fourth annular groove 21 form a second mounting cavity, the second sealing element 16 is arranged in the third mounting cavity, by arranging the circulating water flow annular groove, the contact area with the cooling medium is maximized, the convection flow of the cooling medium is accelerated, and the cooling effect on the sealing element is improved.

[0050] The first sealing element 14 and the second sealing element 16 each include a sealing ring part 1400 and a flange part 1401 extending from the outer ring and the inner ring of the sealing ring part 1400, the two sides of the sealing ring part 1400 are provided as a conical surface or a spherical surface, and form a linear seal with the corresponding mounting cavity, the flange part 1401 is pressed between the valve body 1 and the valve cover 2 or between the valve body 1 and the gland 15, thereby improving the stability and sealing reliability of the sealing element, if only a traditional O-shaped sealing ring structure is used, it is easy to form a misalignment with the corresponding cooling channel, affecting the flowability of the cooling medium.

[0051] Preferably, the first sealing element 14 and the second sealing element 16 are a special-shaped metal sealing element rather than a standard metal ring, the two sides of the sealing ring part 1400 can be provided as a conical surface or a spherical surface to achieve linear sealing between the cooperating valve body 1 and valve cover 2 or between the valve cover 2 and gland 15, a plurality of small holes are provided on the plane between the conical surface or the spherical surface, the small holes are through holes and are paired and communicated with the first flow channel 9 of the valve body 1, the second flow channel 10 of the valve cover 2, and the third flow channel 17 of the gland 15, forming a continuous cooling channel, which maximizes the uniform, stable and continuous cooling of the valve body 1, the valve cover 2, the gland 15 and the associated key internal parts.

[0052] Preferably, the cross section of each annular groove is trapezoidal, which can form a reliable seal in cooperation with the sealing ring part 1400.

[0053] Preferably, a gap is provided between the sealing ring part 1400 and the groove bottom of the corresponding annular groove on both sides to fill the cooling liquid and accelerate the convection flow of the cooling medium, thereby improving the cooling effect on the sealing element.

[0054] In high temperature ball valve, the probability of valve failure is generally the ball valve seat is locked and cannot act, the ball valve structure has fixed ball and floating ball two categories, the fixed ball is because the cooperation of the upper and lower valve rod and the shaft hole is extremely easy to occur the valve rod is locked, the valve seat is locked, so the floating ball structure is more. However, in the floating ball high temperature ball valve, in order to realize the bidirectional sealing, the flexible graphite and other high temperature resistant nonmetallic material sealing ring is often arranged on the back of the valve seat to seal, so the temperature resistance of the nonmetallic flexible graphite and the activity reliability of the valve seat become a big hidden danger.

[0055] To this end, the inlet valve seat assembly is arranged in the valve body 1, the inlet valve seat assembly comprises an inlet valve seat 23, a protective ring 24 and a disc spring 25, the protective ring 24 is arranged between the circumferential outer wall of the inlet valve seat 23 and the circumferential inner wall of the valve body 1, the end of the inlet valve seat 23 away from the bonnet 2 is provided with a first sealing plane 26, the other end forms a seal with the ball 22, the valve body 1 is provided with a second sealing plane 27 corresponding to the first sealing plane 26, the disc spring 25 is abutted between the valve body 1 and the inlet valve seat 23 and located in the inner ring of the first sealing plane 26 and the second sealing plane 27; in this way, the disc spring 25 provides pre-tightening force while forming isolation of the inlet valve seat end to the particulate dust medium, and the protective ring 24 further forms isolation to the particulate dust medium that may exist under reverse pressure, protecting the high cleanliness and long-term sealing performance of the first sealing plane 26 and the second sealing plane 27.

[0056] Secondly, the outlet valve seat assembly is arranged in the bonnet 2, the outlet valve seat assembly comprises a fixed valve seat 28, a pressing plate 29 and a screw 30, the pressing plate 29 presses the fixed valve seat 28, the screw 30 passes through the pressing plate 29 to fix the fixed valve seat 28 on the bonnet 2, the head is welded and fixed with the pressing plate 29, the end of the fixed valve seat 28 away from the valve body 1 is provided with a third sealing plane 31, the other end forms a seal with the ball 22, the bonnet 2 is provided with a fourth sealing plane 32 sealingly matched with the third sealing plane 31, the third sealing plane 31 and the fourth sealing plane 32 are tightly attached and matched under the fixation of the pressing plate 29 and the screw 30.

[0057] In order to prevent the possible thread loosening at high temperature, the head of the screw 30 is welded and fixed with the pressing plate 29, ensuring that the fixed valve seat 28 and the bonnet 2 remain as a whole at any time.

[0058] In this way, the sealing type of the anti-lock bidirectional sealing floating ball structure is formed, specifically, the valve seat at the outlet end is arranged as a fixed valve seat and is fixed by the pressing plate 29 and the screw 30, regardless of temperature changes, the fixed valve seat 28 is always integrated with the bonnet 2, and the sealing between the fixed valve seat 28 and the bonnet 2 is not on the outer circle but is designed as a plane seal, without considering the size cooperation between the outer circles.

[0059] The valve seat of the inlet end is set as a floating valve seat, and the sealing is not set on the outer circle of the inlet valve seat 23, but is set on the end face of the inlet valve seat 23 corresponding to the valve body 1 to form a plane seal.

[0060] Preferably, the disc spring 25 surface is increased with a ZS-1 thermal insulation coating, and the thermal conductivity coefficient of the coating is only 0.03 W / (m•K). After the coating is increased, the actual disc spring 25 surface can resist high temperature exceeding 600 DEG C, meets the long-term reliable and stable application of INCONEL high-temperature and high-strength material, not only provides pre-tightening sealing force for the ball and the valve seat, but also can absorb the size deviation caused by thermal expansion and cold shrinkage.

[0061] The gap is set between the circumferential outer wall of the inlet valve seat 23 and the circumferential inner wall of the valve body 1, that is, the circumferential outer wall of the inlet valve seat 23 and the circumferential inner wall of the valve body 1 are not matched with the related tolerance band. The size of the gap depends on the size change of the material thermal expansion and cold shrinkage, and the possibility that the inlet valve seat is locked by the valve body under high temperature or temperature difference change is eliminated.

[0062] In some embodiments, as shown in Figure 10 With Figure 11 As shown in the figure, the valve rod 33 is integrally forged, which includes a first shaft part 330, a second shaft part 331, and a positioning shaft part 36 at the upper and lower ends of the second shaft part 331. The diameter of the first shaft part 330 is smaller than that of the second shaft part 331. The packing gland 15 and the valve body 1 are formed with an upper chamber 35. The diameter of the positioning shaft part 36 is greater than that of the second shaft part 331. In this way, the positioning shaft part 36 forms a large end face to prevent blowout, and the second shaft part 331 is limited in the upper chamber 35 by the large end face and cannot fly out due to the action of the medium pressure,

[0063] The surfaces of the two positioning shaft parts 36 are sprayed with HVAF T-800 high-temperature and wear-resistant hardening coating, which can resist temperature and oxidation at 800 DEG C. The second shaft part 331 and the inner hole of the packing gland 15 are kept apart without contact, preventing the valve rod from deviating during the rotation of the ball.

[0064] The lowermost end of the valve rod 33 is stacked with Co20 high-temperature and wear-resistant hard alloy, which can resist temperature and oxidation at 800 DEG C, improve the contact stress at high temperature, and ensure the smooth and reliable movement of the valve.

[0065] The packing gland 15 is not only provided with a flow channel for cooling circulation, but also provided with a heat sink 37, which further reduces the conduction speed of the medium temperature and achieves the effect of temperature reduction and control.

[0066] The connection between the gland 15 and the valve body 1 is fixed by bolts and nuts, and has a positioning pin 38 for secondary positioning to prevent the gland from moving radially.

[0067] The valve body 1 is connected with an increased flange 39 at the inlet end, which can be used to fix a jacketed insulation sleeve 6. A metal sealing gasket 40 and a heat insulation ring 41 are arranged between the increased flange 39 and the valve body 1. The heat insulation ring 41 is located in the inner ring of the metal sealing gasket 40, and a coating with extremely low thermal conductivity, such as ZS-1 heat insulation coating, is coated on the surface of the heat insulation ring 41. The thermal conductivity of the coating is only 0.03 W / (m•K), so that the high temperature in the valve flow passage is further isolated by the heat insulation ring 41, greatly reducing the heating temperature of the metal sealing gasket 40, protecting the metal sealing gasket 40 from extreme high temperature, and ensuring long-term stable and safe sealing effect without leakage.

[0068] In some embodiments, a drain screw sleeve is arranged on the valve cover 2 and communicates with the second flow passage 10. A plug is threadedly connected in the drain screw sleeve, and a gasket is arranged between the plug and the drain screw sleeve to enhance the sealing effect and prevent the medium from leaking from the threaded connection. The material is usually selected from materials with good elasticity and corrosion resistance, such as rubber, asbestos or metal materials.

[0069] Such arrangement is conducive to timely draining the cooling medium or condensed water in the cooling circuit when the ball valve is stopped.

[0070] In summary, after reading the detailed disclosure, those skilled in the art can understand that the foregoing detailed disclosure can be presented only in an exemplary manner and can not be limiting. Although it is not explicitly stated here, those skilled in the art can understand that the present application requires to encompass various reasonable changes, improvements and modifications to the embodiments. These changes, improvements and modifications are intended to be proposed by the present application and are within the spirit and scope of the exemplary embodiments of the present application.

[0071] In addition, it should be understood that in the foregoing description of the embodiments of the present application, for the purpose of helping to understand one feature, the present application combines various features in a single embodiment, figure or its description for the purpose of simplifying the present application. However, this does not mean that the combination of these features is necessary, and those skilled in the art can certainly mark out part of the equipment as a separate embodiment when reading the present application. That is, the embodiments in the present application can also be understood as the integration of multiple secondary embodiments. And the content of each secondary embodiment is also valid when there are less than all the features of a single foregoing disclosed embodiment.

[0072] Finally, it should be understood that the embodiments of the application disclosed herein are illustrative of the principles of the present application. Other modifications that are obvious within the spirit and principles of the application are encompassed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application. Those of skill in the art could readily devise their own modifications to the specific embodiments disclosed within the scope of the application. Accordingly, the disclosure of embodiments of the application is intended to be illustrative, but not limiting, of the scope of the application.

Claims

1. A high-temperature ball valve with internal and external dual-circulation cooling channels, characterized in that, The device includes a valve body and a valve cover connected together. A flow channel protective sleeve is provided inside the inlet end of the valve body and inside the outlet end of the valve cover, forming an inner inlet chamber and an inner outlet chamber with the valve body and valve cover respectively. A jacketed insulation sleeve is provided outside the inlet end of the valve body and outside the outlet end of the valve cover, forming an outer inlet chamber and an outer outlet chamber with the valve body and valve cover respectively. A first flow channel is provided on the valve body, and a second flow channel is provided on the valve cover. The first and second flow channels connect the inner inlet chamber and the inner outlet chamber. An inlet flange and an outlet flange are provided on the valve body and valve cover respectively. Flow channel holes are provided on both the inlet flange and the outlet flange, connecting the outer inlet chamber and the inner inlet chamber, as well as the inner outlet chamber and the outer outlet chamber, forming an internal and external dual-circulation cooling flow channel. A first sealing element is provided between the valve body and the valve cover, and a first through hole is provided on the first sealing element to connect the first flow channel and the second flow channel. It also includes a gland connected to the valve body, a second sealing element is provided between the gland and the valve body, a third flow channel is provided on the gland along its axial direction, and a second through hole is provided on the second sealing element, the second through hole being used to connect the first flow channel and the third flow channel and the second flow channel and the third flow channel; Both the first and second sealing elements include a sealing ring portion and a flange portion formed by the outer and inner rings of the sealing ring portion. The two sides of the sealing ring portion are provided as conical or spherical surfaces and form a line seal with the corresponding mounting cavity. The flange portion abuts against the valve body and valve cover or between the valve body and gland.

2. The ultra-high temperature ball valve with internal and external dual-circulation cooling channels according to claim 1, characterized in that, The valve body has a first annular groove communicating with the first flow channel on the connecting side facing the valve cover, and the valve cover has a second annular groove communicating with the second flow channel on the connecting side facing the valve body. The first annular groove and the second annular groove are joined to form a first mounting cavity, and the first sealing element is disposed in the first mounting cavity.

3. The ultra-high temperature ball valve with internal and external dual-circulation cooling channels according to claim 1, characterized in that, The valve body has a third annular groove communicating with the first flow channel on the connecting side facing the gland, and the gland has a fourth annular groove communicating with the third flow channel on the connecting side facing the valve body. The third annular groove and the fourth annular groove are joined to form a second mounting cavity, and the second sealing element is disposed in the third mounting cavity.

4. The ultra-high temperature ball valve with internal and external dual-circulation cooling channels according to claim 1, characterized in that, Also includes: sphere; An inlet valve seat assembly is disposed within the valve body. The inlet valve seat assembly includes an inlet valve seat, a protective ring, and a disc spring. The protective ring is disposed between the circumferential outer wall of the inlet valve seat and the circumferential inner wall of the valve body. A first sealing plane is provided at the end of the inlet valve seat away from the valve cover, and the other end of the inlet valve seat forms a seal with the ball. A second sealing plane is provided on the valve body corresponding to the first sealing plane. The disc spring abuts between the valve body and the inlet valve seat and is located on the inner ring of the first sealing plane and the second sealing plane. An outlet valve seat assembly is disposed within the valve cover. The outlet valve seat assembly includes a fixed valve seat, a pressure plate, and a screw. The pressure plate presses against the fixed valve seat, and the screw passes through the pressure plate to fix the fixed valve seat to the valve cover. Its head is welded to the pressure plate. The end of the fixed valve seat away from the valve body is provided with a third sealing plane, and its other end forms a seal with the ball. The valve cover is provided with a fourth sealing plane that seals with the third sealing plane.

5. A high-temperature ball valve with internal and external dual-circulation cooling channels according to claim 4, characterized in that, A gap is provided between the outer circumferential wall of the inlet valve seat and the inner circumferential wall of the valve body.

6. The ultra-high temperature ball valve with internal and external dual-circulation cooling channels according to claim 1, characterized in that, It also includes a valve stem, which includes a first shaft portion and a second shaft portion. The diameter of the first shaft portion is smaller than the diameter of the second shaft portion. A stuffing box is provided between the first shaft portion and the gland. An upper chamber is formed between the valve body and the gland. Positioning shaft portions are provided at both the upper and lower ends of the second shaft portion. The diameter of the positioning shaft portion is larger than the diameter of the second shaft portion. The second shaft portion is limited in the upper chamber by the positioning shaft portions. A gap is maintained between the second shaft portion and the inner hole of the gland.

7. A high-temperature ball valve with internal and external dual-circulation cooling channels according to claim 6, characterized in that, The pressure cap is provided with heat dissipation fins, and a positioning pin is provided between the pressure cap and the valve body. An enhancement flange is connected to the inlet end of the valve body. A metal sealing gasket and a heat insulation ring are provided between the enhancement flange and the valve body. The surface of the heat insulation ring is coated with a heat insulation coating, and the heat insulation ring is located in the inner ring of the metal sealing gasket.

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