阅读说明：本技术 一种超低温顶装式固定球阀 (Ultra-low temperature top-mounted fixed ball valve ) 是由 韩泽海 陈洲 于 2021-07-22 设计创作，主要内容包括：本发明涉及一种超低温顶装式固定球阀,包括阀体、设于阀体中腔的球体和与阀体可拆卸连接的加长阀盖,球体的上游侧和下游侧分别设置有上游密封组件和下游密封组件；上游密封组件包括上游阀座、上游预紧单元和上游密封单元,上游阀座的头部设置有上游阀座密封圈和上游刮刀,上游预紧单元包括介质流向依次设置在上游阀座中部的弹簧、弹簧座和支撑环,支撑环与上游阀座可拆卸连接,上游密封单元包括沿介质流向依次设置在上游阀座尾部与阀体之间的弹性挡圈、第一单向唇形密封圈和石墨圈。该超低温顶装式固定球阀结构设计合理,在超低温工况下具有优良的密封性能,使用安全可靠,且可具有在线拆装功能。(The invention relates to an ultralow-temperature top-mounted fixed ball valve which comprises a valve body, a ball body arranged in a middle cavity of the valve body and a lengthened valve cover detachably connected with the valve body, wherein an upstream sealing assembly and a downstream sealing assembly are respectively arranged on the upstream side and the downstream side of the ball body; the upstream sealing assembly comprises an upstream valve seat, an upstream pre-tightening unit and an upstream sealing unit, an upstream valve seat sealing ring and an upstream scraper are arranged at the head of the upstream valve seat, the upstream pre-tightening unit comprises a spring, a spring seat and a supporting ring which are sequentially arranged in the middle of the upstream valve seat in the medium flow direction, the supporting ring is detachably connected with the upstream valve seat, and the upstream sealing unit comprises an elastic check ring, a first one-way lip-shaped sealing ring and a graphite ring which are sequentially arranged between the tail of the upstream valve seat and a valve body in the medium flow direction. This fixed ball valve of ultra-low temperature top-mounted formula structural design is reasonable, has good sealing performance under the ultra-low temperature operating mode, uses safe and reliable, and can have online dismouting function.)

1. An ultralow-temperature top-mounted fixed ball valve comprises a valve body (1), a ball body (2) arranged in a middle cavity of the valve body (1) and a lengthened valve cover (3) detachably connected with the valve body (1), and is characterized in that an upstream sealing assembly (4) and a downstream sealing assembly (5) are respectively arranged on the upstream side and the downstream side of the ball body (2);

the upstream sealing assembly (4) comprises an upstream valve seat (41), an upstream pre-tightening unit and an upstream sealing unit, the upstream valve seat (41) is arranged in the valve body (1) in a sliding way, the head part of the upstream valve seat (41) is provided with an upstream valve seat sealing ring (42) and an upstream scraper (43), the upstream pre-tightening unit comprises a spring (44), a spring seat (45) and a support ring (46) which are sequentially arranged in the middle of the upstream valve seat (41) in the medium flow direction, the support ring (46) is detachably connected with the upstream valve seat (41), the upstream sealing unit comprises an elastic retainer ring (47), a first one-way lip-shaped sealing ring (48) and a graphite ring (49) which are sequentially arranged between the tail part of the upstream valve seat (41) and the valve body (1) along the medium flow direction, and under the normal state, when the upstream valve seat sealing ring (42) is in sealing fit with the ball body (2), a gap is reserved between the upstream scraper (43) and the ball body (2).

2. The ultra-low temperature top-loading type fixed ball valve as claimed in claim 1, wherein the downstream sealing assembly (5) comprises a downstream valve seat (51), a downstream pre-tightening unit (52) and a bidirectional lip seal (53), the downstream valve seat (51) is slidably arranged in the valve body (1), the head of the downstream valve seat (51) is provided with a downstream valve seat seal (54) and a downstream scraper (55), the downstream pre-tightening unit (52) is arranged in the middle of the downstream valve seat (51), the bidirectional lip seal (53) is arranged between the valve body (1) and the tail of the downstream valve seat (51), and a gap is reserved between the downstream scraper (55) and the ball (2) when the downstream valve seat seal (54) is in sealing engagement with the ball (2) in a normal state.

3. The ultra-low temperature top-loading fixed ball valve of claim 2, wherein the upstream seat seal (42) and the downstream seat seal (54) are made of low temperature resistant tetrafluoroethylene PTFE or polychlorotrifluoroethylene PCRFE material.

4. The ultra-low temperature top-mounted fixed ball valve as claimed in claim 1 or 2, characterized in that the lengthened valve cover (3) is of a long-neck structure, the lengthened valve cover (3) is connected with the valve body (1) through a bolt, and a valve cover sealing assembly (6) is arranged between the lengthened valve cover and the valve body.

5. The ultra-low temperature top-loading type fixed ball valve as claimed in claim 4, wherein the bonnet sealing assembly (6) comprises a second one-way lip-shaped sealing ring (61) and a metal graphite wound gasket (62) which are sequentially arranged between the extended bonnet (3) and the valve body (1) from bottom to top.

6. The ultra-low temperature top-mounted fixed ball valve as claimed in claim 4, characterized in that a valve rod (7) connected with the ball body (2) penetrates through the lengthened valve cover (3), an antistatic device (8) contacting with the ball body (2) and/or the lengthened valve cover (3) is arranged at the bottom of the valve rod (7), and a valve rod sealing assembly (9) is arranged at the top of the valve rod (7).

7. The ultra-low temperature top-mounted fixed ball valve according to claim 6, wherein the valve rod sealing assembly (9) comprises a third one-way lip-shaped sealing ring (91), a spacer ring (92), graphite packing (93), a pressure ring (94) and a pressure plate (95) which are sequentially arranged between the valve rod (7) and the lengthened valve cover (3) from bottom to top, the pressure plate (95) is fixedly connected with the lengthened valve cover (3) through a stud, and a disc spring group (96) is arranged between the pressure plate (95) and the top of the stud.

8. The ultra-low temperature top-loading type fixed ball valve as claimed in claim 1, wherein a fixed shaft (10) is further arranged in the cavity of the valve body (1), and the fixed shaft (10) is rotatably connected with the bottom of the ball body (2).

Technical Field

The invention relates to the technical field of ball valves, in particular to an ultralow-temperature top-mounted fixed ball valve.

Background

As a clean energy, LNG is the fastest growing energy in the world today, and meanwhile, LNG construction is also one of the key popularization works of national energy structure adjustment at present. With the rapid development of projects such as LNG factories, receiving stations, transportation stations, gasification stations and the like, an ultralow temperature valve is a key device, most of ultralow temperature valves are imported at present, the ultralow temperature valves are high in price and long in period, and huge risks exist in national energy construction and operation.

Therefore, a fixed ball valve which is applied to ultralow temperature conditions, has good sealing performance and safe and reliable use and can realize the online disassembly and assembly function is urgently needed to be designed.

Disclosure of Invention

The technical problem to be solved by the invention is as follows: in order to overcome the defects of the prior art, the ultralow-temperature top-mounted fixed ball valve is provided.

In order to achieve the technical effects, the invention adopts the technical scheme that: an ultralow-temperature top-mounted fixed ball valve comprises a valve body, a ball body arranged in a middle cavity of the valve body and a lengthened valve cover detachably connected with the valve body, wherein an upstream sealing assembly and a downstream sealing assembly are respectively arranged on the upstream side and the downstream side of the ball body;

the upper reaches seal assembly includes upper reaches disk seat, upper reaches pretension unit and upper reaches sealing unit, the upper reaches disk seat slides and sets up in the valve body, and the head of upper reaches disk seat is provided with upper reaches disk seat sealing washer and upper reaches scraper, upper reaches pretension unit includes that the medium flow direction sets gradually spring, spring holder and the support ring at upper reaches disk seat middle part, the support ring can be dismantled with the upper reaches disk seat and be connected, upper reaches sealing unit includes along the medium flow direction set gradually at the elastic retaining ring between upper reaches disk seat afterbody and the valve body, first one-way lip seal circle and graphite circle, under the normal condition, when upper reaches disk seat sealing washer and ball seal the laminating, leave the clearance between upper reaches scraper and the spheroid.

Preferably, the downstream sealing assembly comprises a downstream valve seat, a downstream pre-tightening unit and a bidirectional lip-shaped sealing ring, the downstream valve seat is slidably arranged in the valve body, the head of the downstream valve seat is provided with a downstream valve seat sealing ring and a downstream scraper, the downstream pre-tightening unit is arranged in the middle of the downstream valve seat, the bidirectional lip-shaped sealing ring is arranged between the valve body and the tail of the downstream valve seat, and in a normal state, when the downstream valve seat sealing ring is in sealing fit with the ball body, a gap is reserved between the downstream scraper and the ball body.

Preferably, the upstream valve seat sealing ring and the downstream valve seat sealing ring are both made of low-temperature-resistant tetrafluoroethylene PTFE or polychlorotrifluoroethylene PCRFE materials.

Preferably, the lengthened valve cover is of a long-neck structure, the lengthened valve cover is connected with the valve body through a bolt, and a valve cover sealing assembly is arranged between the lengthened valve cover and the valve body.

Preferably, the valve cover sealing assembly comprises a second one-way lip-shaped sealing ring and a metal graphite winding pad which are sequentially arranged between the lengthened valve cover and the valve body from bottom to top.

Preferably, a valve rod connected with the ball body penetrates through the lengthened valve cover, an anti-static device in contact with the ball body and/or the lengthened valve cover is arranged at the bottom of the valve rod, and a valve rod sealing assembly is arranged at the top of the valve rod.

Preferably, the valve rod sealing assembly comprises a third one-way lip-shaped sealing ring, a spacer ring, graphite packing, a pressing ring and a pressing plate which are sequentially arranged between the valve rod and the lengthened valve cover from bottom to top, the pressing plate is fixedly connected with the lengthened valve cover through a stud, and a disc spring group is arranged between the pressing plate and the top of the stud.

Preferably, a fixed shaft is further arranged in the valve body cavity and is rotatably connected with the bottom of the ball body.

Compared with the prior art, the invention has the beneficial effects that: this fixed ball valve of ultra-low temperature top-mounted formula structural design is reasonable, has good sealing performance under the ultra-low temperature operating mode, uses safe and reliable, and can have online dismouting function.

The foregoing description is only an overview of the technical solutions of the present invention, and in order to make the technical means of the present invention more clearly understood, the present invention may be implemented according to the content of the description, and in order to make the above and other objects, features, and advantages of the present invention more clearly understood, the present invention will be further described in detail with reference to the accompanying drawings and the embodiments, and it is apparent that the described embodiments are some, but not all embodiments of the present invention.

Drawings

FIG. 1 is a schematic structural view of an ultra-low temperature top-loading type fixed ball valve of the present invention;

FIG. 2 is a schematic structural view of an upstream seal assembly of the present invention;

FIG. 3 is a schematic structural view of a downstream seal assembly of the present invention;

FIG. 4 is a schematic structural view of a bonnet seal assembly of the present invention;

FIG. 5 is a schematic illustration of the valve stem seal assembly of the present invention.

The reference numbers and corresponding designations in the drawings are: 1. the valve comprises a valve body, 2, a ball body, 3, an elongated valve cover, 4, an upstream sealing assembly, 41, an upstream valve seat, 42, an upstream valve seat sealing ring, 43, an upstream scraper, 44, a spring, 45, a spring seat, 46, a supporting ring, 47, an elastic retainer ring, 48, a first one-way lip-shaped sealing ring, 49, a graphite ring, 5, a downstream sealing assembly, 51, a downstream valve seat, 52, a downstream pre-tightening unit, 53, a two-way lip-shaped sealing ring, 54, a downstream valve seat sealing ring, 55, a downstream scraper, 6, a valve cover sealing assembly, 61, a second one-way lip-shaped sealing ring, 62, a metal graphite winding pad, 7, a valve rod, 8, an anti-static device, 9, a valve rod sealing assembly, 91, a third one-way lip-shaped sealing ring, 92, a spacer ring, 93, graphite packing, 94, a pressing ring, 95, 96, a disc spring group and 10, and a fixed shaft.

Detailed Description

The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic views illustrating only the basic structure of the present invention in a schematic manner, and thus show only the constitution related to the present invention.

As shown in fig. 1, the present embodiment provides an ultra-low temperature top-mounted fixed ball valve, which includes a valve body 1, a ball body 2 disposed in a cavity of the valve body 1, and an extended bonnet 3 detachably connected to the valve body 1, wherein an upstream sealing assembly 4 and a downstream sealing assembly 5 are respectively disposed on an upstream side and a downstream side of the ball body 2; the cavity in the valve body 1 is also provided with a fixed shaft 10, and the fixed shaft 10 is rotatably connected with the bottom of the ball body 2.

As shown in fig. 2, the upstream sealing assembly 4 includes an upstream valve seat 41, an upstream pre-tightening unit and an upstream sealing unit, the upstream valve seat 41 is slidably disposed in the valve body 1, a head of the upstream valve seat 41 is provided with an upstream valve seat sealing ring 42 and an upstream scraper 43, the upstream pre-tightening unit includes a spring 44, a spring seat 45 and a support ring 46 which are sequentially disposed in the middle of the upstream valve seat 41 in a medium flow direction, the support ring 46 is detachably connected to the upstream valve seat 41, the upstream sealing unit includes an elastic collar 47, a first one-way lip-shaped sealing ring 48 and a graphite ring 49 which are sequentially disposed between a tail of the upstream valve seat 41 and the valve body 1 in the medium flow direction, and in a normal state, when the upstream valve seat sealing ring 42 is sealingly attached to the ball 2, a gap is left between the upstream scraper 43 and the ball 2.

Sealing design of the upstream valve seat 41: the upstream valve seat 41 and the ball 2 are sealed by pressing the upstream valve seat sealing ring 42 onto the ball 2 by virtue of a pretightening force provided by an upstream pretightening unit, and the upstream valve seat 41 and the valve body 1 are sealed by virtue of a first one-way lip-shaped sealing ring 48 and a graphite ring 49.

Fireproof design: the upstream valve seat 41 is also designed with a metal sealing structure, when a fire disaster occurs, after the upstream valve seat sealing ring 42 is melted, the upstream scraper 43 can be pushed to the ball body 2 under the action of a medium to form metal-metal sealing, so that the fire disaster is effectively prevented from spreading from the ball seats; meanwhile, the graphite ring 49 can also realize fire prevention between the seat bodies.

And (3) pressure relief design: because the upstream valve seat 41 is designed to be of a single-piston structure, when the pressure of the middle cavity is too high, reverse pressure difference can be formed in the front and the back of the valve seat, so that the upstream valve seat 41 is pushed away from the ball body 2, the pressure of the middle cavity is automatically released to the upstream from the space between the valve seats, and the self-pressure-releasing function is realized.

And (3) online disassembly and assembly design: when the valve is disassembled, the lengthened valve cover 3 on the valve body 1 is opened, the support ring 46 on the upstream valve seat 41 is taken out, the upstream valve seat 41 and the downstream valve seat 51 are pushed away towards two sides, the ball body 2 and the fixed shaft are taken out, and then parts at other valve seats are taken out; the valve can be reversely operated during installation, and then the disassembly and assembly functions of the valve on the pipeline are realized.

As shown in fig. 3, the downstream sealing assembly 5 includes a downstream valve seat 51, a downstream pre-tightening unit 52 and a bidirectional lip seal 53, the downstream valve seat 51 is slidably disposed in the valve body 1, a head of the downstream valve seat 51 is provided with a downstream valve seat seal 54 and a downstream scraper 55, the downstream pre-tightening unit 52 is disposed in the middle of the downstream valve seat 51, the bidirectional lip seal 53 is disposed between the valve body 1 and a tail of the downstream valve seat 51, and in a normal state, when the downstream valve seat seal 54 is sealed with the ball 2, a gap is left between the downstream scraper 55 and the ball 2.

The downstream valve seat 51 is designed as a bidirectional piston sealing structure, the sealing between the downstream valve seat 51 and the valve body 1 is realized by adopting a bidirectional lip-shaped sealing ring 53, the sealing structure between the downstream valve seat 51 and the ball 2 is the same as that between the upstream valve seat 41 and the ball 2, and the online dismounting and mounting function is also provided, which can refer to the upstream valve seat 41 and will not be described repeatedly here.

In order to be suitable for the ultra-low temperature working condition, the upstream valve seat sealing ring 42 and the downstream valve seat sealing ring 54 are both made of low temperature resistant tetrafluoroethylene PTFE or polychlorotrifluoroethylene PCRFE materials.

As shown in fig. 1 and 4, the lengthened valve cover 3 is of a long-neck structure, the lengthened valve cover 3 is connected with the valve body 1 through a bolt, and a valve cover sealing assembly 6 is arranged between the lengthened valve cover 3 and the valve body 1; preferably, the bonnet sealing assembly 6 comprises a second one-way lip-shaped sealing ring 61 and a metal graphite winding pad 62 which are sequentially arranged between the lengthened bonnet 3 and the valve body 1 from bottom to top.

The lengthened valve cover 3 with the long-neck structure can enable the valve rod sealing assembly 9 to be far away from low temperature, sealing effect is guaranteed, the valve cover sealing assembly 6 is sealed twice by the second one-way lip-shaped sealing ring 61 and the metal graphite winding pad 62, and the problem of medium leakage at low temperature is effectively solved.

As shown in fig. 1 and 5, a valve rod 7 connected with the ball 2 penetrates through the lengthened valve cap 3, an anti-static device 8 contacting with the ball 2 and/or the lengthened valve cap 3 is arranged at the bottom of the valve rod 7, and a valve rod sealing assembly 9 is arranged at the top of the valve rod 7; preferably, the valve rod sealing assembly 9 includes a third one-way lip-shaped sealing ring 91, a spacer ring 92, graphite packing 93, a pressure ring 94 and a pressure plate 95, which are sequentially arranged from bottom to top between the valve rod 7 and the extended valve cover 3, the pressure plate 95 is fixedly connected with the extended valve cover 3 through a stud, and a disc spring group 96 is arranged between the pressure plate 95 and the top of the stud.

Because LNG belongs to inflammable and explosive medium, can produce static in the valve switching process, can pour the static that produces into the external world in time through designing antistatic device 8, can prevent to cause the incident because of the gathering of static. The valve rod 7 and the lengthened valve cover 3 are sealed by the third one-way lip-shaped sealing ring 91 and the graphite packing 93, wherein the graphite packing 93 is pre-tightened by the disc spring group 96, so that even if the graphite packing 93 loosens due to temperature and medium pressure changes and the like in use, the packing box of the lengthened valve cover 3 can always keep a certain pre-tightening force, and the sealing reliability of the valve rod 7 is improved.

To sum up, this fixed ball valve of ultra-low temperature top-mounted formula structural design is reasonable, has good sealing performance under the ultra-low temperature operating mode, uses safe and reliable, and can have online dismouting function.

The present invention is not limited to the above-described embodiments, and various modifications made without inventive step from the above-described concept will fall within the scope of the present invention for those skilled in the art.