CN204284478U - LNG heavy caliber cast steel stop valve - Google Patents
LNG heavy caliber cast steel stop valve Download PDFInfo
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- CN204284478U CN204284478U CN201420709733.8U CN201420709733U CN204284478U CN 204284478 U CN204284478 U CN 204284478U CN 201420709733 U CN201420709733 U CN 201420709733U CN 204284478 U CN204284478 U CN 204284478U
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Abstract
Heavy caliber cast steel stop valve under LNG heavy caliber cast steel stop valve, particularly a kind of LNG ultralow-temperature operation conditions, belongs to valve field.Body cavity adopts the guide structure with guiding rib, and guiding rib is arranged on body cavity; The middle flange of valve gap and valve body joint adopt the combination seal of spirotallic gasket and spring energy-storage ring, and the middle flange of valve gap is fixedly connected with the combination of butterfly spring by stud, nut with valve body; Valve gap adopts long-neck structure, and the upper sealing of valve rod and valve stem seal are arranged in valve gap long-neck, and valve stem seal adopts multi-sealing structure, and arranges disc spring group pretension compensation bit architecture.The connection of flange and sealing reliability during structure of the present utility model ensures, make the leakage point of valve leakage out of steam system reduce to minimum number, valve rod place adopts multi-sealing structure mode to ensure the high-performance sealed requirement of valve rod place zero leakage.
Description
Technical field
The utility model relates to LNG heavy caliber cast steel stop valve, and particularly heavy caliber cast steel stop valve under a kind of LNG ultralow-temperature operation conditions, belongs to valve field.
Background technique
Along with the anxiety of world petroleum resource, rock gas more and more obtains the attention of countries in the world with its abundant reserves.In recent years, due to maldistribution of the resources weighing apparatus, all greatly developing LNG accumulating industry all over the world, LNG/LPG pipeline and cargo ship are built on a large scale, use the Cryogenic valve of a large amount of high added values in projects.In the application of LNG Cryogenic valve, pipeline medium is ultralow temperature, high-pressure liquefaction rock gas.This kind of medium be inflammable, explosive, have hypertoxicity medium, and once leak in ambient atmosphere environment, amount of leakage will take advantage of 500 polyploid accumulated amounts to amplify, and all can cause inestimable serious consequence to personnel and surrounding environment.LNG ultralow temperature heavy caliber cast steel stop valve plays vital effect in LNG pipeline, should consider that valve ensures the particularity of valve performance under ultralow-temperature operation conditions, ensures the sealability requirement of valve no matter at low temperatures or under normal temperature again.
Summary of the invention
In order to solve above-mentioned prior art Problems existing, the utility model provides a kind of heavy caliber cast steel stop valve be applicable under LNG ultralow-temperature operation conditions.
For achieving the above object, the utility model solves the technological scheme that its technical problem adopts: LNG heavy caliber cast steel stop valve, comprise valve body, flap, valve seat, valve rod and valve gap, body cavity adopts the guide structure with guiding rib, and guiding rib is arranged on body cavity; The middle flange of valve gap and valve body joint adopt the combination seal of spirotallic gasket and spring energy-storage ring, and the middle flange of valve gap is fixedly connected with the combination of disc spring by stud, nut with valve body; Valve gap adopts long-neck structure, and the upper sealing of valve rod and valve stem seal are arranged in valve gap long-neck, and valve stem seal adopts multi-sealing structure, and arranges disc spring group pretension collocation structure.Described multi-sealing structure comprises four groups of sealings, is respectively an O type circle, the 2nd O type circle, packing seal, spring energy storage circle; Described disc spring group pretension collocation structure is fixed on support, and support casing, outside multi-sealing structure, is connected and fixed by screw thread with valve gap, and is welded and fixed integral formula structure; Disc spring group pretension collocation structure comprises swing bolt, disc spring group and movable joint nut; Swing bolt, movable joint nut fix disc spring group, and disc spring group compresses multi-sealing structure by hold-down grid through filler pressing sleeve.The long-neck structure of described valve gap arranges draining board, and draining board is two flap-type structures, after can adjusting suitable height, then is welded and fixed with valve gap according to field condition.Plane sealing is adopted between described flap and valve seat.
The mode of structure that valve body adopts cast inblock butt welding to connect.Valve body material adopts the material consistent with piping material chemical composition and mechanical property, is linked into an integrated entity by butt welding connection and pipeline, decreases the leakage point that pipeline connects, ensure that the sealing reliability of overall pipeline.Body cavity adopts with the guide structure form of swinging to muscle.Guiding rib is arranged on body cavity circumferentially on three equal parts position, and the keying total travel of guiding rib to flap plays leading role, decreases the frictional force in the surface of contact of flap and valve body and opening-closing process.
After adopting such scheme, compared with prior art there is following beneficial effect: in valve body, flange adopts the seal form of multi-sealed combination to ensure overall sealability.Middle Flange joint adopts bolt to add the combination connecting mode of disc spring, the bit shift compensation under treatment temperature change and elasticity creep, the connection of flange and sealing reliability in guarantee.Valve gap adopts the mode of structure adding long-neck solid forging, and changes sealing on valve rod and valve stem seal into all design in valve gap structural type by originally designing respectively at support and valve gap Split type structure, makes the leakage point of valve leakage out of steam system reduce to minimum number.Upper sealing is arranged on the lower position closest to multi-sealing structure, prevent sealing and filler multi-sealed between valve gap in there is a large amount of cryogenic gas, when amplifying by influence of temperature change volume, causing in valve gap and there is localized high pressure areas, occur peril.Valve rod place adopts multi-sealing structure mode to ensure the high-performance sealed requirement of valve rod place zero leakage.Adopt the mode of disc spring group pretension compensate for displacement amount of deformation, the change of the material deformation amount caused during compensates, and the change of the amount of deformation that the Sealing such as filler relaxes after working long hours, ensure packing seal place sealability, thus reach the high-performance sealed requirement of valve rod place zero leakage.Flap, valve seat adopt the sealing means of plane sealing, avoid conventional conical surface seal just to form tape sealing and cause the insecure shortcoming of sealing because high/low temperature change makes sealing strip be out of shape inconsistent, substantially increase the reliability of high/low temperature temperature variation and alternating hot and cold situation lower seal.Draining board plays the effect of protection valve body and heat radiation, can reduce the whole height of valve.Simultaneously draining board is designed to two flap-type structures, both can according to designing requirement fixed position before valve dispatches from the factory, and integrally welded with valve gap, also according to field condition, finally can carry out gang welding after installing at the scene.Locking chain locking device, can be fixed on the switching position of valve and require position, avoid occurring misoperation of valve phenomenon, cause other to affect.
Accompanying drawing explanation
Fig. 1 is the structural drawing of LNG ultralow temperature heavy caliber cast steel stop valve;
Fig. 2 is I enlarged view of LNG ultralow temperature heavy caliber cast steel stop valve;
Fig. 3 is II enlarged view of LNG ultralow temperature heavy caliber cast steel stop valve;
Fig. 4 is the structural drawing of valve body part;
Fig. 5 is the sectional view of valve body part A-A;
Fig. 6 is the structural drawing of valve cover portion;
Fig. 7 is the structural drawing of valve gap and valve body joint;
Fig. 8 is the structural drawing that flap and valve seat planes seal.
In figure: 1, valve body, 2, flap, 3, valve seat, 4, pad, 5, valve rod, 6, disc gland, 7, spring energy-storage ring, 8, stud, 9, nut, 10, disc spring, 11, spirotallic gasket, 12, rivet, 13, nameplate, 14, valve gap, 15, draining board, 16, spring energy-storage circle, 17, filler dottle pin, 18, packing seal, 19, filler, 20, dottle pin, 21, one O type circle, 22, 2nd O type circle, 23, pivot pin, 24, filler pressing sleeve, 25, swing bolt, 26, hold-down grid, 27, movable joint nut, 28, disc spring group, 29, pin, 30, block, 31, support, 32, needle bearing, 33, lubricating cup, 34, Stem Mut, 35, support upper cover, 36, handwheel, 37, comparatively flat nut, 38, chain, 39, tapered end, 40, guiding rib, 41, long-neck, 42, valve stem seal, 43, upper sealing, 44, plane sealing.
Embodiment
For understanding the structure of LNG heavy caliber cast steel stop valve in depth, composition graphs 1 to Fig. 8 is described as follows:
LNG heavy caliber cast steel stop valve, comprises valve body 1, flap 2, valve seat 3, valve rod 5 and valve gap 14, and valve body 1 inner chamber adopts the guide structure with guiding rib 40, and guiding rib 40 is arranged on valve body 1 inner chamber; The middle flange of valve gap 14 and valve body 1 joint adopt the combination seal of spirotallic gasket 11 and spring energy-storage ring 7, and the middle flange of valve gap 14 is fixedly connected with the combination of disc spring 10 by stud 8, nut 9 with valve body 1; Valve gap 14 adopts long-neck 41 structure, and the upper sealing 43 of valve rod 5 and valve stem seal 42 are arranged in valve gap 14 long-neck 41, and valve stem seal 42 adopts multi-sealing structure, and arranges disc spring group pretension collocation structure; Plane sealing 44 is adopted between flap 2 and valve seat 3.Described multi-sealing structure comprises four groups of sealings, is respectively O type circle the 21, a 2nd O type circle 22, packing seal 18, spring energy storage circle 16; Described disc spring group pretension collocation structure is fixed on support 31, and support 31 is enclosed within outside multi-sealing structure, is connected and fixed by screw thread with valve gap 14, and is welded and fixed integral formula structure; Disc spring group pretension collocation structure comprises swing bolt 25, disc spring group 28 and movable joint nut 27; Swing bolt 25, movable joint nut 27 fix disc spring group 28, and disc spring group 28 compresses filler pressing sleeve 24 by hold-down grid 26.Long-neck 41 structure of described valve gap 14 arranges draining board 15, and draining board 15 is two flap-type structures.
The mode of structure that valve body adopts cast inblock butt welding to connect.Valve body material adopts the material consistent with piping material chemical composition and mechanical property, is linked into an integrated entity by butt welding connection and pipeline, decreases the leakage point that pipeline connects, ensure that the sealing reliability of overall pipeline.Body cavity adopts with the guide structure form of swinging to muscle.Guiding rib is arranged on body cavity circumferentially on three equal parts position, and the keying total travel of guiding rib to flap plays leading role, decreases the frictional force in the surface of contact of flap and valve body and opening-closing process.
In valve body, flange adopts the seal form of multi-sealed combination to ensure overall sealability.Middle Flange joint adopts bolt to add the combination connecting mode of disc spring, the bit shift compensation under treatment temperature change and elasticity creep, the connection of flange and sealing reliability in guarantee.Valve gap adopts the mode of structure adding long-neck solid forging, and changes sealing on valve rod and the sealing of valve rod place into all design in valve gap structural type by originally designing respectively at support and valve gap Split type structure, makes the leakage point of valve leakage out of steam system reduce to minimum number.Upper sealing is arranged on the lower position closest to multi-sealing structure, prevent sealing and filler multi-sealed between valve gap in there is a large amount of cryogenic gas, when amplifying by influence of temperature change volume, causing in valve gap and there is localized high pressure areas, occur peril.Valve rod place adopts multi-sealing structure mode to ensure the high-performance sealed requirement of valve rod place zero leakage.Adopt the mode of disc spring group pretension compensate for displacement amount of deformation, the change of the material deformation amount caused during compensates, and the change of the amount of deformation that the Sealing such as filler relaxes after working long hours, ensure packing seal place sealability, thus reach the high-performance sealed requirement of valve rod place zero leakage.Flap, valve seat adopt the sealing means of plane sealing, avoid conventional conical surface seal just to form tape sealing and cause the insecure shortcoming of sealing because high/low temperature change makes sealing strip be out of shape inconsistent, substantially increase the reliability of high/low temperature temperature variation and alternating hot and cold situation lower seal.Draining board plays the effect of protection valve body and heat radiation, can reduce the whole height of valve.Simultaneously draining board is designed to two flap-type structures, both can according to designing requirement fixed position before valve dispatches from the factory, and integrally welded with valve gap, also according to field condition, finally can carry out gang welding after installing at the scene.Locking chain locking device, can be fixed on the switching position of valve and require position, avoid occurring misoperation of valve phenomenon, cause other to affect.
Claims (5)
1.LNG heavy caliber cast steel stop valve, comprise valve body (1), flap (2), valve seat (3), valve rod (5) and valve gap (14), it is characterized in that: valve body (1) inner chamber adopts the guide structure with guiding rib (40), and guiding rib (40) is arranged on valve body (1) inner chamber; The middle flange of valve gap (14) and valve body (1) joint adopt the combination seal of spirotallic gasket (11) and spring energy-storage ring (7), and the middle flange of valve gap (14) is fixedly connected with the combination of disc spring (10) by stud (8), nut (9) with valve body (1); Valve gap (14) adopts long-neck (41) structure, and the upper sealing (43) of valve rod (5) and valve stem seal (42) are arranged in valve gap (14) long-neck (41), and valve stem seal (42) adopts multi-sealing structure, and arranges disc spring group pretension collocation structure.
2. LNG heavy caliber cast steel stop valve according to claim 1, is characterized in that: described multi-sealing structure comprises four groups of sealings, is respectively an O type circle (21), the 2nd O type circle (22), packing seal (18), spring energy storage circle (16).
3. LNG heavy caliber cast steel stop valve according to claim 1, it is characterized in that: described disc spring group pretension collocation structure is fixed on support (31), support (31) is enclosed within outside multi-sealing structure, be connected and fixed by screw thread with valve gap (14), and be welded and fixed integral formula structure; Disc spring group pretension collocation structure comprises swing bolt (25), disc spring group (28) and movable joint nut (27); Swing bolt (25), movable joint nut (27) fix disc spring group (28), and disc spring group (28) compresses multi-sealing structure by hold-down grid (26) through filler pressing sleeve (24).
4. LNG heavy caliber cast steel stop valve according to claim 1, is characterized in that: long-neck (41) structure of described valve gap (14) arranges draining board (15), and draining board (15) is two flap-type structures.
5. LNG heavy caliber cast steel stop valve according to claim 1, is characterized in that: adopt plane sealing (44) between described flap (2) and valve seat (3).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420709733.8U CN204284478U (en) | 2014-11-24 | 2014-11-24 | LNG heavy caliber cast steel stop valve |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420709733.8U CN204284478U (en) | 2014-11-24 | 2014-11-24 | LNG heavy caliber cast steel stop valve |
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| CN204284478U true CN204284478U (en) | 2015-04-22 |
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| CN201420709733.8U Active CN204284478U (en) | 2014-11-24 | 2014-11-24 | LNG heavy caliber cast steel stop valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587914A (en) * | 2016-03-14 | 2016-05-18 | 西诺威阀门控制（苏州）有限公司 | Connecting structure for valve cover and valve body |
| WO2018053663A1 (en) * | 2016-09-22 | 2018-03-29 | 沈静静 | Y-shaped electric-powered ultra-high pressure spherical sealing shut-off valve |
| CN108468846A (en) * | 2018-05-23 | 2018-08-31 | 德维阀门铸造（苏州）股份有限公司 | A kind of valve body lid connecting flange load device |
| CN112503188A (en) * | 2021-01-04 | 2021-03-16 | 李红 | Natural gas is with low temperature trip valve that has anti-leakage structure |
-
2014
- 2014-11-24 CN CN201420709733.8U patent/CN204284478U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105587914A (en) * | 2016-03-14 | 2016-05-18 | 西诺威阀门控制（苏州）有限公司 | Connecting structure for valve cover and valve body |
| WO2018053663A1 (en) * | 2016-09-22 | 2018-03-29 | 沈静静 | Y-shaped electric-powered ultra-high pressure spherical sealing shut-off valve |
| CN108468846A (en) * | 2018-05-23 | 2018-08-31 | 德维阀门铸造（苏州）股份有限公司 | A kind of valve body lid connecting flange load device |
| CN112503188A (en) * | 2021-01-04 | 2021-03-16 | 李红 | Natural gas is with low temperature trip valve that has anti-leakage structure |
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