CN108506513A - The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding - Google Patents
The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding Download PDFInfo
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- CN108506513A CN108506513A CN201810571762.5A CN201810571762A CN108506513A CN 108506513 A CN108506513 A CN 108506513A CN 201810571762 A CN201810571762 A CN 201810571762A CN 108506513 A CN108506513 A CN 108506513A
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- 238000011144 upstream manufacturing Methods 0.000 claims abstract description 222
- 238000012856 packing Methods 0.000 claims abstract description 70
- 238000007789 sealing Methods 0.000 claims abstract description 53
- 230000000694 effects Effects 0.000 claims abstract description 21
- 230000004888 barrier function Effects 0.000 claims abstract description 16
- 238000009434 installation Methods 0.000 claims description 22
- 125000006850 spacer group Chemical group 0.000 claims description 13
- 230000000712 assembly Effects 0.000 claims description 8
- 238000000429 assembly Methods 0.000 claims description 8
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 4
- 229910002804 graphite Inorganic materials 0.000 claims description 4
- 239000010439 graphite Substances 0.000 claims description 4
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 239000007787 solid Substances 0.000 claims 1
- 239000003949 liquefied natural gas Substances 0.000 description 17
- 238000010586 diagram Methods 0.000 description 9
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 6
- 208000002925 dental caries Diseases 0.000 description 4
- 230000008676 import Effects 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 230000008859 change Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000009182 swimming Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 238000006073 displacement reaction Methods 0.000 description 2
- 239000007789 gas Substances 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 239000003345 natural gas Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 description 1
- 238000004458 analytical method Methods 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000002737 fuel gas Substances 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- 229910000816 inconels 718 Inorganic materials 0.000 description 1
- 238000007373 indentation Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005192 partition Methods 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 230000008439 repair process Effects 0.000 description 1
- 238000009987 spinning Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 229910052717 sulfur Inorganic materials 0.000 description 1
- 239000011593 sulfur Substances 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/06—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary with plugs having spherical surfaces; Packings therefor
- F16K5/0663—Packings
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K27/00—Construction of housing; Use of materials therefor
- F16K27/06—Construction of housing; Use of materials therefor of taps or cocks
- F16K27/067—Construction of housing; Use of materials therefor of taps or cocks with spherical plugs
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K5/00—Plug valves; Taps or cocks comprising only cut-off apparatus having at least one of the sealing faces shaped as a more or less complete surface of a solid of revolution, the opening and closing movement being predominantly rotary
- F16K5/08—Details
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Lift Valve (AREA)
Abstract
The present invention relates to a kind of LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding, including valve body, sphere, upstream valve seat and downstream valve seat, valve rod and valve deck, upstream valve seat is single-piston effect valve seat, downstream valve seat is double-piston effect valve seat, and between upstream valve seat and valve body, the upstream seal component barrier ring for preventing upstream lip packing component from moving axially is equipped between the upstream lip packing component and upstream valve seat thread segment inner face of sphere side；The downstream seal component barrier ring for preventing downstream lip packing component from moving axially is installed on downstream valve seat and valve body between the downstream lip packing component and downstream valve seat thread segment inner face.Above structure avoids lip packing component and slides in the trench, it ensure that the leakproofness that valve seat is stablized, realize the sealing problem of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG media, upstream direction pressure release when effective solution superpressure ensures the security performance of entire valve.
Description
Technical field
The invention belongs to low temperature or sulfur resistive ball valve technical fields, prevent valve base seal from sliding more particularly to a kind of
LNG ultralow temperature top-loading ball valves.
Background technology
Liquefied natural gas (LNG) is clean energy resource, and natural gas is fuel gas naturally mined in gas field, mainly
It is made of methane.LNG is to be cooled to -162 DEG C of ultralow temperature by gaseous natural gas under normal pressure, is allowed to condense into liquid.It
Storage and transportation space can be greatlyd save after right gas liquefaction, and has the characteristics that calorific value is big, performance is high.It is the weight of national energy strategy
Point industry.But the valve of key area also relies on always import, especially heavy caliber, high-pressure ultra-low temperature top-loading ball valve, on
It is single-piston effect valve seat to swim valve seat 3-1, and downstream valve seat 3-2 is double-piston effect valve seat, and when valve lumen superpressure can only be upward
Roam all around the would is to pressure release.
Domestic existing ultralow temperature top-loading ball valve, in assembly, valve seat tail portion can reserve longer fitting allowance, this is just
So that installing, rear LIP-SEAL groove dimensions are too long, and in the pressure for bearing different directions, LIP-SEAL will produce larger displacement,
To which sealing is there are larger unstability, the present invention completely solves this problem.
Multiple LIP-SEAL is spaced from each other by the present invention using partition apparatus, forms independent fixed LIP-SEAL grooves,
The fitting allowance of valve seat tail excludes outside LIP-SEAL grooves when top-loading ball valve is assembled, and avoids LIP-SEAL in the trench
Sliding ensure that the leakproofness that valve seat is stablized, provide the service life of valve.Product of the present invention can on-line maintenance, realize
The sealing of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG media, upstream direction pressure release when effective solution superpressure, is protected
Demonstrate,prove the security performance of entire valve.Inventive can fully meet the level of same kind of products at abroad, fill up domestic blank,
Import will gradually be substituted.
Invention content
The present invention provides a kind of LNG for preventing valve base seal from sliding to solve technical problem present in known technology
Ultralow temperature top-loading ball valve；The sealing problem of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG media is realized, it is effective to solve
Upstream direction pressure release when superpressure of having determined ensures sealing and the security performance of entire valve, and extend containment member uses the longevity
Life.
The present invention is adopted the technical scheme that solve technical problem present in known technology：
It is a kind of prevent valve base seal slide LNG ultralow temperature top-loading ball valves, including valve body, sphere, valve seat, valve rod with
And valve deck, wherein the sphere and valve seat are installed in the channel of the valve body, the valve deck is mounted on valve body by fastener
Upper end, valve rod is installed in valve deck, described in the channel of valve body valve rod connect sphere, wherein the valve seat is divided into upstream
Valve seat and downstream valve seat, upstream valve seat are single-piston effect valve seat, and downstream valve seat is double-piston effect valve seat, and upstream valve seat is under
Trip valve seat is placed in the both sides of the sphere；And upstream valve seat is slidably mounted in the upstream valve seat installation cavity of valve body, described
Downstream valve seat is slidably mounted in the downstream valve seat installation cavity of valve body；
It is installed with upstream retainer plate, the end face of the upstream retainer plate in the bottom of the upstream valve seat installation cavity of valve body
On be along the circumferential direction laid with several located upstream pins, the axial direction of the located upstream pin and the horizontal central line of valve body are flat
Row setting；Alignment pin position is corresponded in the upstream face of the upstream valve seat is equipped with upstream pin hole, the located upstream pin inserting
In the pin hole of upstream, the upstream valve seat is moved axially along located upstream pin；It is close that the upstream valve seat is equipped with two-stage staged
Platform is sealed, is equipped with upstream lip packing component in each sealing station, the valve body corresponds to the upstream lip of upstream valve seat excircle
Containment member is equipped with sealing station；The upstream lippacking contacts to form sealing structure with valve interior wall；The upstream valve seat
It is equipped with external thread section close to one end of sphere, upstream pressure ring is fitted on external thread section；The upstream pressure ring and the valve body
Upstream pretightening butterfly spring is set between interior outer step hole shoulder；
When the upstream pressure ring upstream preloading spring direction precession, the upstream pretightening butterfly spring is compressed；Meanwhile it is described on
Trip pretightening butterfly spring pushes upstream valve seat to move out, until leaning on upper sphere, continues when precession upstream pretightening butterfly spring on upstream valve seat
Valve seat insert and sphere compress, form upstream seal structure；
It is installed with downstream retainer plate, the end face of the downstream retainer plate in the bottom of the downstream valve seat installation cavity of valve body
On be along the circumferential direction laid with several downstream location pins, the axial direction of the downstream location pin and the horizontal central line of valve body are flat
Row setting；Alignment pin position is corresponded under the downstream end face of the downstream valve seat is equipped with downstream pin hole, the downstream location pin inserting
In the pin hole of downstream, the downstream valve seat is moved axially along downstream location pin；It is close that downstream lip is set on the downstream valve seat
Component is sealed, the downstream lip packing component that the valve body corresponds to downstream valve seat excircle is equipped with sealing station；The downstream lip is close
Sealing contacts to form sealing structure with valve interior wall；The downstream valve seat is equipped with external thread section close to one end of sphere, in outer spiral shell
Downstream pressure ring is fitted under line section；Downstream is set between the outer step hole shoulder in the downstream pressure ring and the valve body and pre-tightens butterfly
Spring；When the downstream pressure ring downstream preloading spring direction precession, the downstream pretightening butterfly spring is compressed；Meanwhile the downstream is pre-
Tight butterfly spring pushes downstream valve seat to move out, until leaning on upper sphere, continues the valve on downstream valve seat when precession downstream pretightening butterfly spring
Seat sealing ring is compressed with sphere, forms downstream seal structure；
It is characterized in that：Prevent upstream lip packing component from moving axially the is installed between upstream valve seat and valve body
One upstream seal component obstructs ring assemblies；Close to sphere side upstream lip packing component and upstream valve seat thread segment inner face it
Between be equipped with prevent upstream lip packing component move axially the second upstream seal component barrier ring；In valve body and upstream valve seat
Between form independent fixed upstream lip packing component installation space；It is installed in upstream lip packing component installation space
Swim lip packing component；
It is installed between the downstream lip packing component and downstream valve seat thread segment inner face on downstream valve seat and valve body
There is the downstream seal component barrier ring for preventing downstream lip packing component from moving axially；It is formed between valve body and downstream valve seat only
Fixed downstream lip packing component installation space is found, downstream lip packing is installed in downstream lip packing component installation space
Component.
The present invention can also adopt the following technical scheme that：
Upstream lip packing component close to upstream valve seat tail portion includes two lip packing components being arranged in the same direction.
Upstream lip packing component on the upstream valve seat of sphere side includes two in the lip packing structure backwards to setting
Part.
Locking spacing ring is both provided on the outer ring surface of the upstream pressure ring and downstream pressure ring, the locking spacing ring passes through
Backing-up screw is fixed；It is equipped with protrusion in the end of the locking spacing ring, the protrusion can be arranged on valve body madial wall
Boss it is inconsistent, to limit upstream and downstream pressure ring rotation.
The upstream pressure ring and downstream pressure ring are both provided on the end face of sphere for being inserted into tooling turn upstream and downstream
The fabrication hole of valve seat pressure.
Between upstream valve seat and valve body, flexible graphite sealing ring is equipped between downstream valve seat and valve body.
First upstream seal component barrier ring assemblies include inner split ring, outer press ring and middle spacer ring, valve body it is interior
Wall is equipped with middle spacer ring mounting groove, and the outer wall of inner split ring is equipped with middle spacer ring mounting groove seam allowance, and the middle spacer ring is using split
Ring or pendant collet structure.
The invention has the advantages and positive effects that：Since the present invention uses above-mentioned technical proposal, has the following advantages：
1, multiple lip packing component (LIP-SEAL) is spaced from each other using barrier ring element, forms independent fixed lip
Shape containment member (LIP-SEAL) groove, the fitting allowance of valve seat tail is excluded in lip packing component when top-loading ball valve is assembled
(LIP-SEAL) it outside groove, avoids lip packing component (LIP-SEAL) and slides in the trench, ensure that valve seat is stablized close
Feng Xing provides the service life of valve.Solving existing ultralow temperature top-loading ball valve can reserve valve seat tail portion in assembly
Longer fitting allowance, avoids that install rear lip containment member (LIP-SEAL) groove dimensions too long, is bearing different directions
Pressure when, lip packing component (LIP-SEAL) will produce larger displacement, to improve the stability of sealing.
2, the present invention is respectively placed in sphere both sides, by rationally designing and counting using the split type valve seat of single dual-piston structure
It calculates, it can be achieved that rational valve overpressure relief function；Upstream valve seat is single-piston effect valve seat, and downstream valve seat is double-piston effect
Valve seat, when realizing LNG medium superpressures can only upstream direction leakage, and ensure the sealing performance of entire valve.
3, by designing the structure of the upstream and downstream valve seat and upper and lower pressure ring of screw-thread fit form, and upstream and downstream is set and is fixed
Circle, makes upstream and downstream valve seat that can only in axial direction move linearly, and prevents when rotating upstream and downstream pressure ring valve seat because of transfer
And lip packing component (LIP-SEAL) is damaged, setting butterfly spring can effectively provide the initial sealing of ball valve.
In short, the present invention can on-line maintenance, realize the sealing of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG media
Problem, upstream direction pressure release when effective solution superpressure, ensures sealing and the security performance of entire valve.Inventive energy
The level for having fully meet same kind of products at abroad, has filled up domestic blank, will gradually substitute import.
Description of the drawings
Fig. 1 is the general assembly structural schematic diagram of ball valve.
Fig. 2 is when sphere assembles and valve seat gap schematic diagram.
Fig. 3 is the gap schematic diagram that sphere assembles rear valve base and valve body.
Fig. 4 is the stress diagram of upstream valve seat sealing when upstream is with pressure.
Fig. 5 is the downstream stress diagram with pressure for swimming valve base sealing at present.
Fig. 6 is the stress diagram of downstream valve base sealing when lumen is with pressure.
Fig. 7 is upstream valve seat self-relieving stress diagram when lumen is with pressure；
Fig. 8 is locking spacing ring structural schematic diagram；
Fig. 9 is split type first upstream seal component barrier ring component structure diagram.
In figure：1, valve body；1-1, boss；2, sphere；3-1, upstream valve seat；3-2, downstream valve seat；4, valve rod；5, valve deck；
6, upstream retainer plate；7, located upstream pin；8, upstream pin hole；9, upstream lip packing component；10, upstream pressure ring；11, upstream is pre-
Tight butterfly spring；12, downstream retainer plate；13, downstream location pin；14, downstream pin hole；15, downstream lip packing component；16, downstream is pressed
Ring；17, downstream pretightening butterfly spring；18, locking spacing ring；18-1, protrusion；19, backing-up screw；20, fabrication hole；21, soft graphite
Sealing ring；22-1, the first upstream seal component obstruct ring assemblies；22-10, inner split ring；22-11, outer press ring；22-12, middle interval
Ring；22-2, the second upstream seal component obstruct ring assemblies；23, downstream seal component barrier ring.
Specific implementation mode
In order to further understand the content, features and effects of the present invention, the following examples are hereby given, and coordinate attached drawing
Detailed description are as follows：
Referring to Fig. 1, a kind of LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding, including valve body 1, sphere
2, valve seat, valve rod 4 and valve deck 5, wherein the sphere and valve seat are installed in the channel of the valve body, the valve deck 5 passes through
Fastener is mounted on the upper end of valve body, and valve rod 4 is installed in valve deck, and the valve rod described in the channel of valve body connects sphere 2,
Described in valve seat be divided into upstream valve seat 3-1 and downstream valve seat 3-2, upstream valve seat 3-1 is single-piston effect valve seat, downstream valve seat 3-
2 be double-piston effect valve seat, and upstream valve seat 3-1 and downstream valve seat 3-2 are placed in the both sides of the sphere 2；And upstream valve seat
3-1 is slidably mounted in the upstream valve seat 3-1 installation cavitys of valve body, and the downstream valve seat 3-2 is slidably mounted on the downstream valve of valve body
In seat 3-2 installation cavitys；
It is installed with upstream retainer plate 6, the upstream retainer plate 6 in the bottom of the upstream valve seat 3-1 installation cavitys of valve body 1
End face on be along the circumferential direction laid with several located upstream pins 7, the water of the axial direction and valve body of the located upstream pin 7
Flat center line is arranged in parallel；Corresponded in the upstream face of the upstream valve seat 3-1 alignment pin position be equipped with upstream pin hole 8, it is described on
Trip positioning pin 7 is inserted into upstream pin hole 8, and the upstream valve seat 3-1 is moved axially along located upstream pin 7；The upstream valve seat
3-1 is equipped with two-stage staged sealing station, and upstream lip packing component 9 is equipped in each sealing station, on the valve body corresponds to
The upstream lip packing component 9 for swimming valve seat 3-1 excircles is equipped with sealing station；The upstream lippacking is contacted with valve interior wall
Form sealing structure；The upstream valve seat 3-1 is equipped with external thread section close to one end of sphere, and upstream is fitted on external thread section
Pressure ring 10；Upstream pretightening butterfly spring 11 is set between the outer step hole shoulder in the upstream pressure ring 10 and the valve body；
When the upstream preloading spring direction precession of the upstream pressure ring 10, the upstream pretightening butterfly spring 11 is compressed；Meanwhile institute
Stating upstream pretightening butterfly spring 11 pushes upstream valve seat 3-1 to move out, until upper sphere is leaned on, when continuing precession upstream pretightening butterfly spring 11
Valve seat insert on upstream valve seat 3-1 is compressed with sphere, forms upstream seal structure；
It is installed with downstream retainer plate 12, the downstream retainer plate in the bottom of the downstream valve seat 3-2 installation cavitys of valve body
Several downstream location pins 13, the axial direction and valve body of the downstream location pin 13 are along the circumferential direction laid on 12 end face
Horizontal central line be arranged in parallel；Alignment pin position is corresponded under the downstream end face of the downstream valve seat 3-2 is equipped with downstream pin hole 14, institute
It states downstream location pin 13 to be inserted into downstream pin hole 14, the downstream valve seat 3-2 is moved axially along downstream location pin 13；Under described
It is set with downstream lip packing component 15 on trip valve seat 3-2, the downstream lip that the valve body corresponds to downstream valve seat 3-2 excircles is close
It seals component 15 and is equipped with sealing station；The downstream lippacking contacts to form sealing structure with valve interior wall；The downstream valve seat
3-2 is equipped with external thread section close to one end of sphere, and downstream pressure ring 16 is fitted under external thread section；The downstream pressure ring 16 and institute
It states and downstream pretightening butterfly spring 17 is set between the outer step hole shoulder in valve body；The downstream pressure ring 16 downstream revolve by preloading spring direction
Into when, compress the downstream pretightening butterfly spring 17；Meanwhile the downstream pretightening butterfly spring 17 pushes downstream valve seat 3-2 to move out, directly
To upper sphere is leaned on, continues valve seat insert when precession downstream pretightening butterfly spring 17 on downstream valve seat 3-2 and compressed with sphere, under formation
Swim sealing structure；
It is close that the first upstream for preventing upstream lip packing component from moving axially is installed between upstream valve seat 3-1 and valve body
Seal component and obstruct ring assemblies 22-1, close to sphere side upstream lip packing component 9 and upstream valve seat 3-1 thread segments inner face it
Between be equipped with prevent upstream lip packing component 9 move axially the second upstream seal component barrier ring 22-2；In valve body and upper
Independent fixed 9 installation space of upstream lip packing component is formed between trip valve seat 3-1；The institute on downstream valve seat 3-2 and valve body
It states to be equipped between downstream lip packing component 15 and downstream valve seat 3-2 thread segment inner faces and prevents downstream lip packing component 15
The downstream seal component barrier ring 23 of axial movement；Independent fixed downstream lip is formed between valve body and downstream valve seat 3-2
Containment member installation space installs downstream lip packing component 15 in downstream lip packing component.
Preferably, include that two lips being arranged in the same direction are close close to the upstream lip packing component 9 of the tail portions upstream valve seat 3-1
Seal component.
Preferably, the upstream lip packing component 9 on the upstream valve seat 3-1 of sphere side includes two in backwards to setting
Lip packing component.
Preferably, upstream and downstream pressure ring 16 loosens in order to prevent, on the outer ring surface of the upstream pressure ring 10 and downstream pressure ring 16
It is both provided with locking spacing ring 18, the locking spacing ring is fixed by backing-up screw 19；In the end of the locking spacing ring
Equipped with raised 18-1, the protrusion can be inconsistent with the boss 1-1 that is arranged on valve body madial wall, to limit the upstream
Pressure ring 10 rotates.
Preferably, the upstream pressure ring 10 and downstream pressure ring 16 are both provided on the end face of sphere for being inserted into tooling
The fabrication hole 20 of turn upstream and downstream valve seat 3-1 pressures.
Preferably, flexible graphite sealing is equipped between upstream valve seat 3-1 and valve body, between downstream valve seat 3-2 and valve body
Circle 21.
The lip packing component (LIP-SEAL) used in above structure is a kind of elastic seal ring, belongs to the prior art,
It is close to the surface of sealed coupling part by lip, blocks leakage channel and obtains sealing effect, when sealed medium pressure increases
When, lip is softened, and is closely bonded with sealing surface.It can be made using lip packing component (LIP-SEAL) group subsequent
Sealing ring further compresses, and leakproofness further enhances.Lip packing component (LIP-SEAL) pressing force is with pressure medium
Change and change, not only can guarantee enough sealing pressing forces, but also unlikely generates excessive friction.Each group lip packing component
(LIP-SEAL) structure type can also be not quite similar, and according to actual needs, upstream valve seat 3-1 and downstream valve seat 3-2 pass through conjunction
Reason design and calculate, when realizing inner cavity LNG medium superpressures can only upstream direction leakage, and ensure the leakproofness of entire valve
Energy.
In above structure, upstream retainer plate 6 and the 12 seam crossing spot welding of downstream retainer plate are fixed, the step being welded in valve body
The bottom end in hole generally takes the uniformly distributed spot welding of several points (generally 4 points) in end.
In above structure, to prevent the occlusion of screw thread, upstream and downstream pressure ring 10＆16 from using the material of high intensity and hardness,
INCONEL718 is generally used, prevents from killing with valve seat.
In above structure, upstream and downstream pressure ring 16 plays considerable effect, upstream and downstream valve seat 3-2 in pre- tightening seal
More there is its unique effect with the structure of 16 thread seal of upstream and downstream pressure ring, is adjusted by the spinning in and out of upstream and downstream pressure ring 16
Save the pretightning force of butterfly spring.As shown in figure 3, can apply to butterfly spring (Xiang butterfly spring precession) when inside precession upstream and downstream pressure ring 16
Certain pretightning force, at this moment, butterfly spring can drive the upstream and downstream pressure ring 16 that is threadedly coupled each other and upper and lower in the case where pre-tightening force effect
Both trip valve seat 3-2 are pushed outwardly jointly, to make upstream and downstream valve seat 3-2 withstand sphere, realize sealing.
Integral structure can be used in the first upstream seal component barrier ring in above structure, as shown in Figure 2；On extending
The service life for swimming containment member, prevents crimp；The first upstream seal component barrier ring assemblies are using following seperated
Structure, such as Fig. 9；First upstream seal component barrier ring includes inner split ring 22-10, outer press ring 22-11 and middle spacer ring 22-
12, the inner wall of valve body is equipped with middle spacer ring mounting groove, and the outer wall of inner split ring is equipped with middle spacer ring mounting groove seam allowance, the middle interval
Using divided ring, either either the purpose of pendant collet structure is easy for installing divided ring or four pendant collet structure divided ring ring
Open loop structure belongs to the prior art, also just says that the middle spacer ring by a closed loop is divided into divided ring or pendant collet, then in group
It is installed one by one when dress.
The application process of this pretightning force can be by operating realization as follows：Body cavity is before being packed into sphere, in valve body
Upstream and downstream retainer plate and upstream and downstream positioning pin are first filled, then hinders upstream and downstream lip packing component and upstream and downstream containment member
Spacer ring is sleeved on the valve seat of upstream and downstream, and using in the valve seat orifice of tooling indentation valve body, refills butterfly spring, is further screwed on upper and lower
Pressure ring is swum, keeps upstream and downstream valve seat end face concordant with upstream and downstream pressure ring end face, upstream and downstream valve seat is pushed into the valve seat orifice tail of valve body
Portion, it is L1 (such as Fig. 3) that fit-up gap is reserved between upstream and downstream valve seat and sphere, and sphere is kept to be packed into valve seat fully open position；
Then it recycles tooling to rotate upstream and downstream pressure ring, so that upstream and downstream pressure ring is fed to the direction of butterfly spring, that is, make upstream and downstream valve
Seat is promoted to sphere until withstand sphere, and minimum sealing when generating ball valve sealing is pre-tightened than pressure, realizes initial sealing.This
When, valve seat tail portion gap is L2 (such as Fig. 2), and this gap does not influence the size of upstream and downstream lip packing member groove, entirely filling
With in the process, upstream and downstream lip packing component and upstream and downstream pressure ring are always kept in a fixed state.
In order to further illustrate the use state that this is used, force analysis of Te Yiben practicalities in the state of difference is subject to
Explanation：
As shown in figure 4, when upstream pressure medium is P1, upstream valve seat 3-1 seals, forced area A1 ＞ B1,
Difference in areas is C1, at this time under pressure medium effect, pushes upstream valve seat 3-1 to spheres, realizes sealing, medium is blocked to pass through.
As shown in figure 5, when media pressure downstream is P3, downstream valve seat 3-2 seals, forced area A2 ＞ B2,
Difference in areas is C2, at this time under pressure medium effect, pushes downstream valve seat 3-2 to spheres, realizes sealing, medium is blocked to pass through.
As shown in fig. 6, when the boosting of cavity pressure exception or upstream valve seat 3-1 are abraded in the middle, lumen pressure medium is P2 at this time,
Downstream valve seat 3-2 seals at this time, forced area A3 ＞ B3, difference in areas C2, at this time pressure medium effect under, will under
Trip valve seat 3-2 pushes sphere to, realizes sealing, blocks the medium of leakage by downstream valve seat 3-2, realizes reliable sealing.
As shown in fig. 7, when sphere is from standard-sized sheet to fully closed, media flow is blocked, at this time P1=P2, when valve lumen medium
LNG gasifies, and P2 is sharply increased, and is much larger than P1, at this point, upstream valve seat A4 ＞ B4, difference in areas C4, under the action of P2,
Upstream valve seat 3-1 is pushed away into sphere, medium is released to line upstream, and downstream valve seat 3-2 is under the action of P2 at this time, by downstream valve
Seat 3-2 pushes sphere to, realizes sealing, and medium is blocked downstream to leak.
A kind of LNG ultralow temperature top-loading ball valve of the present invention, because the size of lip packing component (LIP-SEAL) groove is fixed,
It prevents valve base seal sliding from ensure that the leakproofness and stability of valve, avoids because of valve cavity LNG gasification, pressure drastically
When increase, so that valve and pipeline is avoided occurring the possibility of explosion danger, and medium can be blocked and downstream leaked, and can be
Line repairs, and fundamentally ensures the quality and operational safety of LNG engineerings.
The above, only preferable specific implementation mode, but scope of protection of the present invention is not limited thereto, and it is specific close
Envelope form can take the circumstances into consideration to adjust the quantity of multiple lip packing component (LIP-SEAL) according to the pressure rating and caliber size of valve,
Reach best sealing effect, any one skilled in the art in the technical scope disclosed by the present invention,
The change or replacement that can be readily occurred in, should be covered by the protection scope of the present invention.The present invention trial-produces successfully, has filled up state
Interior blank will be altered in steps the situation of domestic long-term import, improve the market competitiveness of enterprise, so that enterprise is continued to develop strong
Greatly, it is that enterprise creates good benefit.
The above is only the preferred embodiments of the present invention, and is not intended to limit the present invention in any form,
Every any simple modification made to the above embodiment according to the technical essence of the invention, equivalent variations and modification, belong to
In the range of technical solution of the present invention.
Claims (7)
1. it is a kind of prevent valve base seal slide LNG ultralow temperature top-loading ball valves, including valve body, sphere, valve seat, valve rod and
Valve deck, wherein the sphere and valve seat are installed in the channel of the valve body, the valve deck is mounted on valve body by fastener
Upper end installs valve rod in valve deck, and the valve rod described in the channel of valve body connects sphere, wherein the valve seat is divided into upstream valve
Seat and downstream valve seat, upstream valve seat are single-piston effect valve seat, and downstream valve seat is double-piston effect valve seat, upstream valve seat and downstream
Valve seat is placed in the both sides of the sphere；And upstream valve seat is slidably mounted in the upstream valve seat installation cavity of valve body, under described
Trip valve seat is slidably mounted in the downstream valve seat installation cavity of valve body；
It is installed with upstream retainer plate, the end face upper edge of the upstream retainer plate in the bottom of the upstream valve seat installation cavity of valve body
Circumferencial direction is laid with several located upstream pins, and the axial direction of the located upstream pin is parallel with the horizontal central line of valve body to be set
It sets；Alignment pin position is corresponded in the upstream face of the upstream valve seat and is equipped with upstream pin hole, and the located upstream pin is inserted into
It swims in pin hole, the upstream valve seat is moved axially along located upstream pin；The upstream valve seat is equipped with two-stage staged sealing station,
It is equipped with upstream lip packing component in each sealing station, the valve body corresponds to the upstream lip packing structure of upstream valve seat excircle
Part is equipped with sealing station；The upstream lippacking contacts to form sealing structure with valve interior wall；The upstream valve seat is close to ball
One end of body is equipped with external thread section, and upstream pressure ring is fitted on external thread section；It is outer in the upstream pressure ring and the valve body
Upstream pretightening butterfly spring is set between stepped hole shoulder；
When the upstream pressure ring upstream preloading spring direction precession, the upstream pretightening butterfly spring is compressed；Meanwhile the upstream is pre-
Tight butterfly spring pushes upstream valve seat to move out, until leaning on upper sphere, continues the valve on upstream valve seat when precession upstream pretightening butterfly spring
Seat sealing ring is compressed with sphere, forms upstream seal structure；
It is installed with downstream retainer plate, the end face upper edge of the downstream retainer plate in the bottom of the downstream valve seat installation cavity of valve body
Circumferencial direction is laid with several downstream location pins, and the axial direction of the downstream location pin is parallel with the horizontal central line of valve body to be set
It sets；Alignment pin position is corresponded under the downstream end face of the downstream valve seat and is equipped with downstream pin hole, and the downstream location pin is inserted into down
It swims in pin hole, the downstream valve seat is moved axially along downstream location pin；Lip packing structure in downstream is set on the downstream valve seat
Part, the downstream lip packing component that the valve body corresponds to downstream valve seat excircle are equipped with sealing station；The downstream lippacking
It contacts to form sealing structure with valve interior wall；The downstream valve seat is equipped with external thread section close to one end of sphere, in external thread section
Under be fitted with downstream pressure ring；Downstream pretightening butterfly spring is set between the outer step hole shoulder in the downstream pressure ring and the valve body；Institute
When stating the downstream preloading spring direction precession of downstream pressure ring, the downstream pretightening butterfly spring is compressed；Meanwhile the downstream pretightening butterfly spring
It pushes downstream valve seat to move out, until leaning on upper sphere, continues the valve base sealing on downstream valve seat when precession downstream pretightening butterfly spring
Circle is compressed with sphere, forms downstream seal structure；
It is characterized in that：It is equipped between upstream valve seat and valve body on prevent upstream lip packing component from moving axially first
It swims containment member and obstructs ring assemblies；Pacify between the upstream lip packing component and upstream valve seat thread segment inner face of sphere side
Equipped with the second upstream seal component barrier ring for preventing upstream lip packing component from moving axially；Between valve body and upstream valve seat
Form independent fixed upstream lip packing component installation space；Upstream lip is installed in upstream lip packing component installation space
Shape containment member；
It is equipped between the downstream lip packing component and downstream valve seat thread segment inner face on downstream valve seat and valve body anti-
The only downstream seal component barrier ring of downstream lip packing component axial movement；It is formed between valve body and downstream valve seat independent solid
Fixed downstream lip packing component installation space is equipped with downstream lip packing structure in downstream lip packing component installation space
Part.
2. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
Upstream lip packing component close to upstream valve seat tail portion includes two lip packing components being arranged in the same direction.
3. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
Upstream lip packing component on the upstream valve seat of sphere side includes two in the lip packing component backwards to setting.
4. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
Locking spacing ring is both provided on the outer ring surface of the upstream pressure ring and downstream pressure ring, the locking spacing ring passes through backing-up screw
It is fixed；It is equipped with protrusion in the end of the locking spacing ring, the protrusion can be with the boss phase that is arranged on valve body madial wall
It contradicts, to limit the upstream and downstream pressure ring rotation.
5. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
The upstream pressure ring and downstream pressure ring are both provided on the end face of sphere to be used for being inserted into tooling turn upstream and downstream valve seat pressure
Fabrication hole.
6. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
Between upstream valve seat and valve body, flexible graphite sealing ring is equipped between downstream valve seat and valve body.
7. the LNG ultralow temperature top-loading ball valves according to claim 1 for preventing valve base seal from sliding, it is characterised in that：
First upstream seal component barrier ring assemblies include inner split ring, outer press ring and middle spacer ring, during the inner wall of valve body is equipped with
The outer wall of spacer ring mounting groove, inner split ring is equipped with middle spacer ring mounting groove seam allowance, and the middle spacer ring uses divided ring or four
Open loop structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571762.5A CN108506513A (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810571762.5A CN108506513A (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding |
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| CN108506513A true CN108506513A (en) | 2018-09-07 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810571762.5A Pending CN108506513A (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109058505A (en) * | 2018-10-31 | 2018-12-21 | 天津欧通流体控制设备有限公司 | A kind of wedge-type ultralow temperature top mounting ball valve |
| CN113154077A (en) * | 2021-05-07 | 2021-07-23 | 纽托克流体控制有限公司 | Top-mounted type gas storage metal hard sealing ball valve capable of being maintained on line |
| CN113551053A (en) * | 2021-07-22 | 2021-10-26 | 西诺威阀门控制（苏州）有限公司 | Ultra-low temperature top-mounted fixed ball valve |
| CN114754159A (en) * | 2021-01-12 | 2022-07-15 | 纳福希（上海）阀门科技有限公司 | Top-mounted ultra-low temperature soft sealing fixed ball valve |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109058505A (en) * | 2018-10-31 | 2018-12-21 | 天津欧通流体控制设备有限公司 | A kind of wedge-type ultralow temperature top mounting ball valve |
| CN114754159A (en) * | 2021-01-12 | 2022-07-15 | 纳福希（上海）阀门科技有限公司 | Top-mounted ultra-low temperature soft sealing fixed ball valve |
| CN113154077A (en) * | 2021-05-07 | 2021-07-23 | 纽托克流体控制有限公司 | Top-mounted type gas storage metal hard sealing ball valve capable of being maintained on line |
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| CN113551053A (en) * | 2021-07-22 | 2021-10-26 | 西诺威阀门控制（苏州）有限公司 | Ultra-low temperature top-mounted fixed ball valve |
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