CN207333801U - A kind of multi-state valve sealing structure - Google Patents
A kind of multi-state valve sealing structure Download PDFInfo
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- CN207333801U CN207333801U CN201721356344.1U CN201721356344U CN207333801U CN 207333801 U CN207333801 U CN 207333801U CN 201721356344 U CN201721356344 U CN 201721356344U CN 207333801 U CN207333801 U CN 207333801U
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- diaphragm
- valve
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- ring
- valve seat
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Abstract
The utility model discloses a kind of multi-state valve sealing structure, including spool forward end seal structure；Sealing structure is between valve seat and valve body before spool, including diaphragm, graphite-seal ring and hold-down mechanism；Diaphragm both sides are respectively equipped with graphite-seal ring；Hold-down mechanism is arranged on the radial outside of diaphragm, and diaphragm and graphite-seal ring are radially pressed on the ledge structure and valve seat of valve body；Spring preload structure setting is in valve body and valve base chamber.A kind of multi-state valve sealing structure of the utility model, applied in ball valve or Gate-valve sealing system, as the sealing structure between dismountable valve seat and valve body, two way seal is realized in the case of ball valve or gate valve there are two symmetrical valve seats at the same time, spool forward end seal structure medium power and spring preload structure spring force collective effect under, pressure is applied to valve seat, to reach sealing function.
Description
Technical field
It the utility model is related to a kind of multi-state valve sealing structure for valve field.
Background technology
Under high and low temperature operating mode, the requirement such as flow resistance characteristic, sealing performance to valve is especially high, therefore, in engineering mostly
Select ball valve and gate valve.Wherein ball valve generally employs piston type floating valve seat, under the action of spring load and pressure medium,
The gap for causing Material shrinkage by temperature change or expanding can be compensated automatically, ensure that the sealing performance of valve seat and valve core chamber.But
Sealing between floating valve seat and valve body is always the weakness of such valve, is often leaked in engineering, has seriously affected engineering department
The operation of system.
Attached drawing 1 is the sealing structure between ball seat 600 and valve body 500 with floating valve seat currently on the market.Valve seat 600
Sealing between valve body 500 uses rubber o-ring, and the characteristic of elastomeric material determines that brittle break can occurs in it under worst cold case
Split, can be burnt under high pressure operating mode, its use temperature range can only between -70 DEG C~+200 DEG C, do not apply to low temperature -
Operating mode between 256 DEG C~-70 DEG C and+200 DEG C~+770 DEG C of high temperature.
Under the conditions of worst hot case, the sealing of similar attached drawing 2 is used between ball seat 600 and valve body 500 currently on the market
Structure.Although the heatproof of this sealing structure can reach 600 DEG C, graphite-seal ring easily makes graphite in a high voltage state
Material is extruded in the cooperation gap from valve body 500 with valve seat 600, thus the structure is not high pressure resistant.The thermal expansion system of graphite material
Number is larger, and heavy in section graphite-seal ring easily makes swollen dead between valve body 500 and valve seat 600 at high operating temperatures, makes floating valve seat
600 lose piston effect, so that the seal failure of valve.Meanwhile heavy in section graphite-seal ring is heated at high operating temperatures
The influence of expansion, is also easy to increase valve operation moment of torsion, makes valve operation difficult.These are exactly the valve using this structure
The main reason for performance is unstable.This structure can not achieve single valve seat two way seal function, only when medium is before spool
When end flows into, the valve seat before spool could realize sealing function, and the valve seat after spool can not achieve sealing.
Utility model content
The purpose of this utility model is to overcome the deficiencies in the prior art, there is provided a kind of multi-state valve sealing structure,
To solve between the floating valve seat and valve body under high/low temperature, big flow operating mode, the spool portion such as floating valve seat and sphere or flashboard
Sealing leak problem between part.
Realizing a kind of technical solution of above-mentioned purpose is：A kind of multi-state valve sealing structure, including spool forward end seal
Structure；
Sealing structure is between valve seat and valve body before the spool, including diaphragm, graphite-seal ring and hold-down mechanism；Institute
Stating diaphragm includes diaphragm outer shroud and diaphragm inner ring, and the diaphragm outer shroud is located at the valve seat radial outside, the diaphragm inner ring card
It is connected in valve seat, the both sides of the valve body side of the diaphragm outer shroud and the diaphragm inner ring are respectively equipped with graphite-seal ring；Institute
The radial outside that hold-down mechanism is arranged on the diaphragm is stated, between the diaphragm and the valve body, by the diaphragm and institute
Graphite-seal ring is stated radially to be pressed on the ledge structure and valve seat of valve body.
Preferably, the hold-down mechanism includes pining down ring, diaphragm pressure ring, pendant collet or three open loops；It is described pin down ring and
The pressing diaphragm interannular is equipped with screw, is jointly radially pressed on the diaphragm and the graphite-seal ring on valve body, described
Pendant collet or three open loops are arranged between diaphragm pressure ring and valve body, and position-limiting action is played to the diaphragm pressure ring.
Preferably, the hold-down mechanism produces the diaphragm and graphite-seal ring using the structure that threaded engagement compresses
Radial compacting force.
Preferably, the diaphragm is welded with the valve seat.
Further, the graphite-seal ring is used inside soft graphite or metallic cover soft graphite or flexible graphite belt
Metal liner or woven graphite or woven graphite band interior metal serve as a contrast compressing.
A kind of multi-state valve sealing structure of the utility model, applied in ball valve or Gate-valve sealing system, as can
Sealing structure between the valve seat and valve body of dismounting, is realized double in the case of ball valve or gate valve is had two symmetrical valve seats at the same time
To sealing, spool forward end seal structure medium power and spring preload structure spring force collective effect under, to valve seat
Apply power of the pressure along valve passage direction, to play sealing function.Valve seat initial sealing than pressure foundation by valve seat after
The initial deformation screen resilience of spring force and diaphragm, in the case of minimum pressure difference, also ensures that enough seal pressures, nothing
Medium thrust is needed, realizes two way seal.
Brief description of the drawings
Fig. 1 is the signal for the sealing structure that rubber o-ring is used between the valve seat and valve body of the existing ball valve with floating valve seat
Figure；
Fig. 2 is between the valve seat and valve body of the existing ball valve with floating valve seat using single, heavy in section graphite-seal ring close
The schematic diagram of seal structure；
Fig. 3 is the structure diagram using a kind of valve of multi-state valve sealing structure of the utility model；
Fig. 4 is a kind of details enlarged drawing of multi-state valve sealing structure of the utility model in A portions in Fig. 1.
Embodiment
In order to preferably understand the technical solution of the utility model, below by specifically embodiment and combine
Attached drawing is described in detail：
Fig. 3 and Fig. 4 are referred to, is that a kind of multi-state valve sealing structure of the utility model is applied to the implementation of ball valve
Example, including spool forward end seal structure 100 and spring preload structure 200.
Sealing structure 100 is located in the fit clearance of valve seat 600 and valve body 500 before spool, including diaphragm 110, graphite are close
Seal ring 120 and hold-down mechanism；Diaphragm 110 includes outer membrane and interior diaphragm, and diaphragm outer shroud is located at 600 radial outside of valve seat, diaphragm
Inner ring is connected in valve seat 600, and 500 side of valve body of diaphragm outer shroud and the both sides of diaphragm inner ring are respectively equipped with graphite-seal ring
120.In the present embodiment, hold-down mechanism includes pining down ring 131, diaphragm pressure ring 132, pendant collet 133；Pin down ring 131 and pressing diaphragm
Screw 134 is equipped between ring 132, the direction of diaphragm 110 and graphite-seal ring 120 along valve passage is pressed on valve body 500 jointly
Ledge structure and valve body 600 on, pendant collet 133 is arranged between diaphragm pressure ring 132 and valve body 500, to 132 He of diaphragm pressure ring
Pin down ring 131 and play position-limiting action so that diaphragm pressure ring 132 and to pin down ring 131 and screw true to the force direction of diaphragm 110
It is fixed.In addition to the design of the present embodiment, diaphragm 110 can also be used threaded engagement to compress mode, or using welding connecting mode
It is connected with valve seat.
Spring preload structure 200 is arranged between valve body 500 and valve seat 600, including spring 210 and spring base 220, spring
210 are arranged in spring base 220, and spring base 220 is equipped with extrusion structure 221, and extrusion structure 221 is prominent for direction valve seat 600
Go out portion, extrusion structure 221 is connected by graphite-seal ring 120 with valve seat 600, and sealing structure 100 before valve seat 600 and spool is produced
The raw pressure along valve passage direction.
Wherein, graphite-seal ring 120 can use soft graphite, metallic cover soft graphite, flexible graphite belt interior metal
Lining or alternative establishment graphite, establishment graphite tape interior metal lining etc. are compressing.Diaphragm 110 is using the good made of metal of ductility
Into usually unicast ripple patching, need to such as be applied to may be designed as more ripple patchings in the larger sealing structure of amount of movement.
In practical applications, spring preload structure 200 can also use various forms of springs such as butterfly spring, leaf spring, cup spring
To realize.
A kind of bright any temperature work being applicable between -256 DEG C~+770 DEG C of multi-state valve sealing structure of this hair
Condition, the working condition limitation of no -70 DEG C~+200 DEG C of the prior art are applied widely.
The rubber o-ring sealing that the prior art uses between the ball seat and valve body of floating valve seat, uses pressure
It is restricted because using medium and valve latus rectum.As pressure is excessive, rubber o-ring is possible to be extruded or damaged by high pressure.Such as
Applied in gas operating mode, when the inside nominal diameter of valve is more than DN150, maximum pressure should be no more than 10MPa, otherwise just necessary
Take explosion precaution.Graphite-seal ring sealing structure between valve seat and valve body that the prior art uses, when temperature or pressure change compared with
When big, graphite-seal ring is easily breakdown, so as to cause valve base sealing system sealing to leak.Again because of the thermal coefficient of expansion of graphite material
Greatly, heavy in section graphite-seal ring easily makes valve body swollen dead with valve base chamber at high operating temperatures, floating valve seat is lost piston effect,
So that the seal failure of valve.The influence of heavy in section graphite-seal ring expanded by heating at high operating temperatures, is also easy to make valve
Door operation moment of torsion increases, and makes valve operation difficult.Cooperation periphery of the utility model between valve seat 600 and valve body 500 is adopted
With diaphragm seal form, diaphragm 110 produces bending under the active force of spring 210, and promote spool forward end seal structure 100 to
Spool 700 compresses, and realizes the low pressure seal between 600 sealing surface of valve seat and spool 700.Due between valve seat 600 and valve body 500
The sealing central diameter that central diameter is more than 600 sealing surface of valve seat and spool 700 is sealed, can further strengthen valve under the action of pressure medium
The piston effect of seat 600, it is ensured that the high pressure sealing of valve.
The present embodiment is applied to the case of ball valve for a kind of multi-state valve sealing structure of the utility model, this practicality is new
Type can be applied equally to gate valve.
Those of ordinary skill in the art is it should be appreciated that the embodiment of the above is intended merely to illustrate that this practicality is new
Type, and be not used as the restriction to the utility model, as long as in the spirit of the utility model, to the above
Change, the modification of embodiment will all fall in the Claims scope of the utility model.
Claims (5)
1. a kind of multi-state valve sealing structure, including spool forward end seal structure, it is characterised in that：
Sealing structure is between valve seat and valve body before the spool, including diaphragm, graphite-seal ring and hold-down mechanism；The film
Piece includes diaphragm outer shroud and diaphragm inner ring, and the diaphragm outer shroud is located at the valve seat radial outside, and the diaphragm inner ring is connected to
In valve seat, the both sides of the valve body side of the diaphragm outer shroud and the diaphragm inner ring are respectively equipped with graphite-seal ring；The pressure
Tight mechanism is arranged on the radial outside of the diaphragm, between the diaphragm and the valve body, by the diaphragm and the stone
Black sealing ring is radially pressed on the ledge structure and valve seat of valve body.
2. a kind of multi-state valve sealing structure according to claim 1, it is characterised in that the hold-down mechanism includes leading
Ring, diaphragm pressure ring, pendant collet or three open loops processed；It is described to pin down ring and the pressing diaphragm interannular is equipped with screw, jointly by the film
Piece and the graphite-seal ring are radially pressed on valve body, and the pendant collet or three open loops are arranged on diaphragm pressure ring and valve body
Between, position-limiting action is played to the diaphragm pressure ring.
3. a kind of multi-state valve sealing structure according to claim 1, it is characterised in that the hold-down mechanism uses spiral shell
The structure that line screws compression produces radial compacting force to the diaphragm and graphite-seal ring.
4. a kind of multi-state valve sealing structure according to claim 1, it is characterised in that the diaphragm and the valve seat
Welding.
5. a kind of multi-state valve sealing structure according to claim 1, it is characterised in that the graphite-seal ring uses
Gold inside soft graphite or metallic cover soft graphite or flexible graphite belt interior metal lining or woven graphite or woven graphite band
It is compressing to belong to lining.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721356344.1U CN207333801U (en) | 2017-10-20 | 2017-10-20 | A kind of multi-state valve sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201721356344.1U CN207333801U (en) | 2017-10-20 | 2017-10-20 | A kind of multi-state valve sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN207333801U true CN207333801U (en) | 2018-05-08 |
Family
ID=62365987
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721356344.1U Active CN207333801U (en) | 2017-10-20 | 2017-10-20 | A kind of multi-state valve sealing structure |
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| Country | Link |
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| CN (1) | CN207333801U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559449A (en) * | 2017-10-20 | 2018-01-09 | 上海阀门厂股份有限公司 | A kind of multi-state valve sealing structure |
| CN108331936A (en) * | 2018-04-03 | 2018-07-27 | 成都成高阀门有限公司 | A kind of adaptive valve seat construction of high/low temperature and the ball valve for being equipped with the valve seat construction |
-
2017
- 2017-10-20 CN CN201721356344.1U patent/CN207333801U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107559449A (en) * | 2017-10-20 | 2018-01-09 | 上海阀门厂股份有限公司 | A kind of multi-state valve sealing structure |
| CN108331936A (en) * | 2018-04-03 | 2018-07-27 | 成都成高阀门有限公司 | A kind of adaptive valve seat construction of high/low temperature and the ball valve for being equipped with the valve seat construction |
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