CN208381363U - The LNG ultralow temperature top-loading ball valve for preventing valve base seal from sliding - Google Patents
The LNG ultralow temperature top-loading ball valve for preventing valve base seal from sliding Download PDFInfo
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- CN208381363U CN208381363U CN201820818270.7U CN201820818270U CN208381363U CN 208381363 U CN208381363 U CN 208381363U CN 201820818270 U CN201820818270 U CN 201820818270U CN 208381363 U CN208381363 U CN 208381363U
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Abstract
The utility model 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 between the downstream lip packing component and downstream valve seat thread segment inner face on downstream valve seat and valve body.Above structure avoids lip packing component and slides in the trench, it ensure that the stable leakproofness of valve seat, realize the sealing problem of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG medium, upstream direction pressure release when effective solution superpressure guarantees the security performance of entire valve.
Description
Technical field
The utility model belongs to low temperature or sulfur resistive ball valve technical field, prevents valve base seal from sliding more particularly to one kind
LNG ultralow temperature top-loading ball valve.
Background technique
Liquefied natural gas (LNG) is clean energy resource, and natural gas is naturally mined fuel gas 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
Trip valve seat 3-1 is single-piston effect valve seat, 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 when bearing the pressure of different directions, LIP-SEAL can generate larger displacement,
To which sealing is there are biggish unstability, the utility model completely solves this problem.
Multiple LIP-SEAL is spaced from each other by the utility model using partition apparatus, forms independently fixed LIP-SEAL ditch
Slot, the fitting allowance of valve seat tail excludes outside LIP-SEAL groove when top-loading ball valve is assembled, and avoids LIP-SEAL in ditch
Sliding, ensure that the stable leakproofness of valve seat, provides the service life of valve in slot.The utility model product can be tieed up online
It repairs, realizes the sealing of high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG medium, the upward roam all around the would of when effective solution superpressure
To pressure release, guarantee the security performance of entire valve.The utility model performance has fully meet the level of same kind of products at abroad, fills out
Domestic blank has been mended, import will be gradually substituted.
Summary of the invention
The utility model is technical problem present in solution well-known technique and providing one kind prevents valve base seal from sliding
LNG ultralow temperature top-loading ball valve；The sealing problem for realizing high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG medium, has
Upstream direction pressure release when solving superpressure of effect, guarantees the sealing and security performance of entire valve, extends containment member
Service life.
The utility model is adopted the technical scheme that solve technical problem present in well-known technique:
It is a kind of prevent valve base seal slide LNG ultralow temperature top-loading ball valve, 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, the valve rod described in the channel of valve body 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 two 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；
Upstream retainer plate, the end face of the upstream retainer plate are fixedly installed 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 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 shape 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 the pretightening butterfly spring of precession upstream on upstream valve seat
Valve seat insert and sphere compress, formed upstream seal structure；
Downstream retainer plate, the end face of the downstream retainer plate are fixedly installed 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 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 shape 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 shape 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 downstream pressure ring and the intracorporal outer step hole shoulder of the valve 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 when pretightening butterfly spring of precession downstream on downstream valve seat
Seat sealing ring and sphere compress, and form downstream seal structure；
It is characterized by: being equipped with prevent upstream lip packing component from moving axially the 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 independently 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 utility model 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 stop collar is provided on the outer ring surface of the upstream pressure ring and downstream pressure ring, the locking stop collar passes through
Backing-up screw is fixed；It is equipped with protrusion in the end of the locking stop collar, the protrusion can be arranged on valve body inner sidewall
Boss it is inconsistent, to limit upstream and downstream pressure ring rotation.
The upstream pressure ring and downstream pressure ring are provided with for being inserted into tooling turn upstream and downstream on the end face of sphere
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 utility model has the advantages and positive effects of: by adopting the above technical scheme due to the utility model, having
Following advantages:
1, multiple lip packing component (LIP-SEAL) is spaced from each other using barrier ring element, forms independently 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 stable close of valve seat
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 shape containment member (LIP-SEAL) groove dimensions too long, is bearing different directions
Pressure when, lip packing component (LIP-SEAL) can generate larger displacement, to improve the stability of sealing.
2, the utility model is respectively placed in sphere two sides, is passed through rational design using the split type valve seat of single dual-piston structure
With calculating, it can be achieved that reasonable 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 superpressure can only upstream direction leakage, and guarantee the sealing performance of entire valve.
3, by designing the upstream and downstream valve seat for the form that is threadedly engaged and the structure of upper and lower pressure ring, 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 utility model can on-line maintenance, realize high pressure top-loading ball valve under the ultralow-temperature operation conditions such as LNG medium
Sealing problem, upstream direction pressure release when effective solution superpressure, guarantees the sealing and security performance of entire valve.This is practical
Novel performance has fully meet the level of same kind of products at abroad, has filled up domestic blank, will gradually substitute import.
Detailed description of the invention
Fig. 1 is the general assembly structural schematic diagram of ball valve.
Fig. 2 be sphere assemble when with 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 stop collar 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 stop collar；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 embodiment
For the invention, features and effects that can further appreciate that the utility model, the following examples are hereby given, and cooperates
Detailed description are as follows for attached drawing:
Referring to Fig. 1, a kind of LNG ultralow temperature top-loading ball valve 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 two sides of the sphere 2；And upstream valve seat
3-1 is slidably mounted in the upstream valve seat 3-1 installation cavity 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 cavity；
Upstream retainer plate 6, the upstream retainer plate 6 are fixedly installed in the bottom of the upstream valve seat 3-1 installation cavity of valve body 1
End face on be along the circumferential direction laid with several located upstream pins 7, the axial direction of the located upstream pin 7 and the water of valve body
Flat middle line is arranged in parallel；Alignment pin position is corresponded in the upstream face of the upstream valve seat 3-1 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 is corresponding
The upstream lip packing component 9 for swimming valve seat 3-1 excircle 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 upstream pressure ring 10 and the intracorporal outer step hole shoulder of the valve；
When the upstream pressure ring 10 upstream preloading spring direction precession, 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 and sphere on upstream valve seat 3-1 compress, and form upstream seal structure；
Downstream retainer plate 12, the downstream retainer plate are fixedly installed in the bottom of the downstream valve seat 3-2 installation cavity 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 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 shape that the valve body corresponds to downstream valve seat 3-2 excircle 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
State setting downstream pretightening butterfly spring 17 between the intracorporal outer step hole shoulder of valve；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 and sphere when the pretightening butterfly spring 17 of precession downstream on downstream valve seat 3-2 and compress, 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 obstruct ring assemblies 22-1, close to sphere side upstream lip packing component 9 and upstream valve seat 3-1 thread segment 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
Independently 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 face and prevents downstream lip packing component 15
The downstream seal component barrier ring 23 of axial movement；Independently fixed downstream lip shape 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, the upstream lip packing component 9 close to the tail portion upstream valve seat 3-1 includes that two lip shapes being arranged in the same direction are close
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 provided with locking stop collar 18, the locking stop collar is fixed by backing-up screw 19；In the end of the locking stop collar
Equipped with raised 18-1, the protrusion can be inconsistent with the boss 1-1 that is arranged on valve body inner sidewall, to limit the upstream
Pressure ring 10 rotates.
Preferably, the upstream pressure ring 10 and downstream pressure ring 16 are 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 pressure.
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.
Lip packing component (LIP-SEAL) is a kind of elastic seal ring used in above structure, 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 superpressure can only upstream direction leakage, and guarantee 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, and are welded in the intracorporal step of valve
The bottom end in hole generally takes several points uniformly distributed spot welding (generally 4 points) in end.
In above structure, for the occlusion for preventing screw thread, upstream and downstream pressure ring 10&16 uses high-intensitive and hardness material,
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 when pre-tightening sealing
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 when inside precession upstream and downstream pressure ring 16 (Xiang butterfly spring precession)
Certain pretightning force, at this moment, butterfly spring will drive the upstream and downstream pressure ring 16 that is threadedly coupled each other and upper and lower under pretightning force effect
Both trip valve seat 3-2 are pushed outwardly jointly, so that upstream and downstream valve seat 3-2 be made to 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 from being squeezed and deformed；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, perhaps perhaps 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, that is to say, the middle spacer ring of 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 covers on the valve seat of upstream and downstream, and using in the valve seat orifice of tooling indentation valve body, refills butterfly spring, further screw 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, feeds upstream and downstream pressure ring 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, practical force analysis in the state of difference of Te Yiben is subject to
Illustrate:
As shown in figure 4, upstream valve seat 3-1 seals, forced area A1 > B1 when upstream pressure medium is P1,
Difference in areas is C1, at this time under pressure medium effect, pushes upstream valve seat 3-1 to sphere, realizes sealing, medium is blocked to pass through.
As shown in figure 5, downstream valve seat 3-2 seals, forced area A2 > B2 when media pressure downstream is P3,
Difference in areas is C2, at this time under pressure medium effect, pushes downstream valve seat 3-2 to sphere, realizes sealing, medium is blocked to pass through.
As shown in fig. 6, lumen pressure medium is P2 at this time when the boosting of cavity pressure exception or upstream valve seat 3-1 are abraded in the middle,
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, media flow is blocked, at this time P1=P2, when valve lumen medium when sphere is closed from standard-sized sheet to complete
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 utility model, because of the size of lip packing component (LIP-SEAL) groove
It 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
When power sharply increases, valve and pipeline is set to avoid a possibility that explosion danger occurs, and medium can be truncated and downstream leak,
And energy on-line maintenance, fundamentally guarantee the quality and operational safety of LNG engineering.
The above, only preferable specific embodiment, but protection scope of the utility model is not limited thereto, tool
Body seal form can take the circumstances into consideration to adjust multiple lip packing component (LIP-SEAL) according to the pressure rating and caliber size of valve
Quantity reaches optimal sealing effect, the skill that anyone skilled in the art discloses in the utility model
Within the scope of art, any changes or substitutions that can be easily thought of, should be covered within the scope of the utility model.The utility model
It trial-produces successfully, has filled up domestic blank, the situation of domestic long-term import will be altered in steps, improve the market competitiveness of enterprise,
It continues to develop enterprise to grow, creates good benefit for enterprise.
The above is only the preferred embodiment to the utility model, is not made in any form to the utility model
Limitation, it is all according to the technical essence of the utility model any simple modification made to the above embodiment, equivalent variations with
Modification, is all within the scope of the technical scheme of the utility model.
Claims (7)
1. it is a kind of prevent valve base seal slide LNG ultralow temperature top-loading ball valve, 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 two 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；
Upstream retainer plate, edge on the end face of the upstream retainer plate are fixedly installed 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 equipped with upstream pin hole, 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,
Lip packing component in upstream is equipped 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；The upstream pressure ring and the valve are intracorporal outer
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 when pretightening butterfly spring of precession upstream on upstream valve seat
Seat sealing ring and sphere compress, and form upstream seal structure；
Downstream retainer plate, edge on the end face of the downstream retainer plate are fixedly installed 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 equipped with downstream pin hole, 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 downstream pressure ring and the intracorporal outer step hole shoulder of the valve；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 when pretightening butterfly spring of precession downstream on downstream valve seat
Circle is compressed with sphere, forms downstream seal structure；
It is characterized by: being 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 independently 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 valve 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 valve 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 valve according to claim 1 for preventing valve base seal from sliding, it is characterised in that:
Locking stop collar is provided on the outer ring surface of the upstream pressure ring and downstream pressure ring, the locking stop collar passes through backing-up screw
It is fixed；It is equipped with protrusion in the end of the locking stop collar, the protrusion can be with the boss phase that is arranged on valve body inner sidewall
It contradicts, to limit the upstream and downstream pressure ring rotation.
5. the LNG ultralow temperature top-loading ball valve 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 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 valve 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 valve 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
Spacer ring mounting groove, the outer wall of inner split ring are 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 |
|---|---|---|---|
| CN201820818270.7U CN208381363U (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valve for preventing valve base seal from sliding |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201820818270.7U CN208381363U (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valve for preventing valve base seal from sliding |
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| Publication Number | Publication Date |
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| CN208381363U true CN208381363U (en) | 2019-01-15 |
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| CN201820818270.7U Active CN208381363U (en) | 2018-05-29 | 2018-05-29 | The LNG ultralow temperature top-loading ball valve for preventing valve base seal from sliding |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506513A (en) * | 2018-05-29 | 2018-09-07 | 天津祥嘉流体控制系统有限公司 | The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding |
-
2018
- 2018-05-29 CN CN201820818270.7U patent/CN208381363U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108506513A (en) * | 2018-05-29 | 2018-09-07 | 天津祥嘉流体控制系统有限公司 | The LNG ultralow temperature top-loading ball valves for preventing valve base seal from sliding |
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