CN203847782U - Safety valve sealing structure - Google Patents
Safety valve sealing structure Download PDFInfo
- Publication number
- CN203847782U CN203847782U CN201420141997.8U CN201420141997U CN203847782U CN 203847782 U CN203847782 U CN 203847782U CN 201420141997 U CN201420141997 U CN 201420141997U CN 203847782 U CN203847782 U CN 203847782U
- Authority
- CN
- China
- Prior art keywords
- sealing
- safety valve
- described seal
- seal groove
- boss
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Landscapes
- Safety Valves (AREA)
Abstract
The utility model relates to a safety valve sealing structure which comprises a valve seat and a valve element clinging to the upper end face of the valve seat in a vertical moving mode. A sealing groove closed along the peripheral ring is formed in the upper end face of the valve seat, and a sealing boss corresponding to the sealing groove in position and matched with the sealing groove is arranged on the valve element; or a sealing boss closed along the peripheral ring is arranged on the upper end face of the valve seat, and a sealing groove corresponding to the sealing boss in position and matched with the sealing boss is formed in the valve element. Two opposite faces of the sealing groove and the sealing boss abut against each other to achieve sealing. By means of the sealing mode of the safety valve sealing structure, the medium flowing passage stroke is increased, and the medium flowing resistance is improved. Meanwhile, condensate liquid is formed on the sealing face during work of a safety valve, the wettability of the sealing face is improved, the sealing performance of the safety valve is improved, and the leakage is reduced.
Description
Technical field
The utility model relates to a kind of safety valve, relates in particular to a kind of safety valve sealing structure.
Background technique
Safety valve is the important safety attachment of pressure-bearing class special equipment, and when the special equipments such as boilers and pressure vessel are in normal operating condition, when working pressure is no more than specified value, arranged at safety valve is in closed condition.Under closed condition safety valve should have well, reliable sealability.Sealability is not good, and safety valve can produce leakage, loss working medium (being the medium of very valuable or danger close sometimes), increased energy consumption, and made surrounding environment and atmosphere be subject to the pollution of working medium.Excessive leakage even can have influence on the normal work of equipment or system, and even forces device out of service.Lasting leakage also can make sealing surface of safety valve be corroded, thereby causes safety valve total failure.
Safety valve working principle is: by spring, to downward active force of spool, in the time that safety valve is worked, the working medium under spool is to one, safety valve active force upwards, and in the time that medium active force is upwards greater than the downward active force of spring, safety valve is opened; Otherwise arranged at safety valve is in closed condition.
In safety valve when work,, taking boiler as example, its safety valve setting pressure and boiler rated working pressure relation are as following table:
| Boiler rated working pressure (MPa) | Safety valve setting pressure |
| P≤0.8 | Working pressure adds 0.03MPa |
| 0.8<P≤5.9 | 1.04 doubly working pressure |
| P>5.9 | 1.05 doubly working pressure |
As can be seen from the above table, when equipment is normally worked, be just greater than slightly working medium to safety valve active force upwards by spring to the downward active force of spool, sometimes two power or even balance.Other use the special equipment of safety valve also like this.
Because the active force of safety valve medi-spring exceedes medium active force few, require its valve keep sealing, without leaking, its condition is than poor many of the valve of general cut-off use.Owing to not having very large active force to put between sealing surface, valve clack of safety valve is close to and on valve seat, has only formed a sealing load that compression is very little.Sealing load is determined with the difference of equipment operating pressure by valve Set pressure.So, as above to analyze, the difference between pressure when safety valve forms valve opening and the pressure of maintenance sealing, is also a little value conventionally.
When boilers and pressure vessel is used the seal tightness test of safety valve, should strictly follow the regulation of relevant specification and standard.Regulation in GB/T12243-2005 " spring loaded safe valve ": steam is 90% Set pressure with the Seal test pressure of safety valve or is Reseating pressure of a safety valve minimum value, gets the two smaller value.Air or other gas are used and the Seal test pressure (in the time that Set pressure is more than or equal to 0.3MPa) of water or other liquid safety valve is 90% Set pressure.
To the requirement of safety valve sealing difference to some extent according to its use occasion difference.And the difference of use occasion is also determining the difference of safety valve sealing structure.In general, be metal-nonmetallic safety valve for sealing surface, its leakage should be null value; The safety valve that is metal-metal for sealing surface (high temperature pressure vessel etc. generally need this pattern valve), reach without leaking is to be difficult to realize, and still, in national legislation and standard, is quite strict to the regulation of this leak-down rate.
The common sealing configuration form of safety valve:
1) plane sealing: as shown in Figure 5, applying wider is " metal to metal " plane sealing.Plane sealing is manufacturing while repairing easylier, and it does not resemble cone seal and requires flap 3 to have highly accurate coaxality to valve seat 1.
2) cone seal: cone seal is for the higher occasion of pressure, the sealing surface of the cemented carbide of built-up welding, the highly sensitive and having stable behavior can ensure valve opening time.Conventionally on the steam boiler lower than 10.0MPa, adopt plane sealing at pressure.Pressure, at the protection valve for boiler of 10.0～16.0MPa, mainly adopts cone seal.
3) spherical sealed: spherical sealed is also applicable to the occasion of high pressure, and performance is similar to cone seal is the one of cone seal.
4) knife-edge sealing: knife-edge sealing configuration and plane sealing are similar, and normally knife-edge side is metal, and another sealing surface is nonmetallic embedding humanware, because material is softer, are easy to form reliable sealing, process also more than metal to metal require low.
5) sealing with resilient seal surface: when the sealing configuration with resilient seal surface differs larger for temperature in system and waste side temperature, the difference of temperature, likely there is thermal distortion in valve seat and flap, causes seal failure.Elastic sealing structure can compensate thermal distortion, reaches effective sealing.
For plane sealing, its working principle is as follows:
For the sealing configuration of plane pattern, in fact sealing surface is not completely flat, and they are not on whole surface, just on certain contact zones, coincide mutually, causes sealing effect not good, easily produces and leaks.
For reliable sealing between two planes, need certain power to make the out-of-flatness place distortion of these planes, thereby make two planes Continuous Contact on whole circle circumference each other.For holding yielding plastic materials, sealing surface is applied to not too large pressure and just can cause larger plastic deformation, two surperficial out-of-flatnesses place are coincide mutually.Metallic sealing section is because hardness own is high, and producing plastic deformation needs very large power.So, for fear of sealing surface being applied to excessive pressure, just should adopt precision machining as the method for grinding and grinding, polish as much as possible the nao-and micro relief of sealing surfaces and eliminate nonflatness, increase difficulty of processing and processing cost.
Model utility content
The technical problems to be solved in the utility model is, a kind of improved safety valve sealing structure is provided.
The utility model solves the technological scheme that its technical problem adopts: constructs a kind of safety valve sealing structure, comprises valve seat and can be up or down and the spool of described valve seat upper-end surface laminating,
The upper-end surface of described valve seat is provided with at least one seal groove airtight along border, and described spool is provided with at least one seal boss corresponding with described at least one seal groove position and that cooperatively interact;
Described seal boss can be inserted in described seal groove prolapse upwards, the height of described seal boss is not less than the degree of depth of described seal groove, described seal boss comprises the primary sealing area just right with described seal groove, described seal groove comprises secondary sealing area, and described primary sealing area and described secondary sealing area offset and realize sealing; Or:
The upper-end surface of described valve seat is provided with at least one seal boss airtight along border, and described spool is provided with at least one seal groove corresponding with described at least one seal boss position and that cooperatively interact;
Described seal groove can be set on described seal boss by prolapse upwards ground cover, the height of described seal boss is not less than the degree of depth of described seal groove, described seal boss comprises the primary sealing area just right with described seal groove, described seal groove comprises secondary sealing area, and described primary sealing area and described secondary sealing area offset and realize sealing.
Preferably, described primary sealing area, described secondary sealing area are plane.
Preferably, the width of described primary sealing area is not less than 3mm.
Preferably, the section of described seal groove and described seal boss is all rectangular.
Preferably, the height of described seal boss is greater than the degree of depth of described seal groove.
Preferably, the height of described seal boss is greater than at least 1mm of the described seal groove degree of depth.
Preferably, between described seal boss and the bi-side of described seal groove, leave gap.
Preferably, gap is left in the both sides of described seal boss between the bi-side of described seal groove, and the gap of both sides is identical.
Preferably, gap is left in the both sides of described seal boss between the bi-side of described seal groove, and the gap of both sides is all not less than 1mm.
Preferably, the quantity of described seal groove is no less than the quantity of described seal boss.
Implement safety valve sealing structure of the present utility model, there is following beneficial effect: by seal groove being set on valve seat, seal boss being set on spool, or seal boss is set on valve seat, seal groove is set on spool, two just right faces of seal groove and seal boss offset and realize sealing, the sealing means of this model utility safety valve sealing structure, by increasing the stroke of media flow path, has increased the resistance of media flow; Meanwhile, in the time that safety valve is worked, form condensed fluid at sealing surface, improved the wellability of sealing surface, thereby improved the sealing of safety valve, reduced leakage.
Brief description of the drawings
Below in conjunction with drawings and Examples, the utility model is described in further detail, in accompanying drawing:
Fig. 1 is the schematic diagram of the safety valve sealing structure in the utility model the first embodiment;
Fig. 2 is the enlarged view of the partial view A in Fig. 1;
Fig. 3 is the schematic diagram of the safety valve sealing structure in the utility model the second embodiment;
Fig. 4 is the enlarged view of the partial view B in Fig. 3;
Fig. 5 is the schematic diagram of safety valve plane sealing structure in background technique.
Embodiment
Understand for technical characteristics of the present utility model, object and effect being had more clearly, now contrast accompanying drawing and describe embodiment of the present utility model in detail.
As shown in Figure 1, the safety valve sealing structure in the utility model the first embodiment comprises valve seat 1a, spool 3a with the upper-end surface laminating of valve seat 1a, and spool 3a can coordinate with the guide sleeve 2a of safety valve up or down.
The upper-end surface of valve seat 1a is provided with a seal groove 11a airtight along border, spool 3a is provided with seal boss 31a corresponding with sealing groove 11a position and that cooperatively interact, ringwise, what seal boss 31a can prolapse upwards is inserted in seal groove 11a for seal groove 11a and seal boss 31a.
Understandably, in other embodiments, the upper-end surface of valve seat 1a can arrange multiple seal groove 11a along border, and the quantity of seal boss 31a is equal to or less than the quantity of seal groove 11a, and each seal groove 11a and seal boss 31a form the sealing configuration of tooth-like cooperation.
As shown in Figure 2, seal boss 31a comprises the primary sealing area 32a just right with seal groove 11a, seal groove 11a comprises secondary sealing area 12a, and primary sealing area 32a and secondary sealing area 12a are plane, and primary sealing area 32a and secondary sealing area 12a offset and realize sealing.
In order to ensure the sealing of primary sealing area 32a and secondary sealing area 12a, both must remain contact, so the height of seal boss 31a is not less than the degree of depth of seal groove 11a, preferably, the height of seal boss 31a is greater than at least 1mm of the seal groove 11a degree of depth.
Meanwhile, in order to ensure the rigidity of seal boss 31a, the reliability while guaranteeing to contact with valve seat 1a, the width of the width of primary sealing area 32a is not less than 3mm.
Further, the section of seal groove 11a and seal boss 31a is all rectangular, and leaves gap between seal boss 31a and the bi-side of seal groove 11a, the activity space swinging to meet spool 3a, and preferably, the gap of both sides is identical.According to relevant regulations, the radial clearance of spool 3a and guide sleeve 2a is 0.8mm to the maximum, and therefore, the one-sided minimum clearance of seal boss 31a and seal groove 11a is not less than 1mm.
Understandably, in other embodiments, it is trapezoidal etc. that the section of seal groove 11a and seal boss 31a also can be, to ensure that primary sealing area 32a and secondary sealing area 12a are as plane contact.Sealing mode, by increasing the stroke of media flow path, has increased the resistance of media flow; Meanwhile, in the time that safety valve is worked, form condensed fluid at sealing surface, improved the wellability of sealing surface, thereby improved the sealing of safety valve, reduced leakage.
As shown in Figure 3, the safety valve sealing structure in the utility model the second embodiment comprises valve seat 1b, spool 3b with the upper-end surface laminating of valve seat 1b, and spool 3b can coordinate with the guide sleeve 2b of safety valve up or down.
As shown in Figure 4, the upper-end surface of valve seat 1b is provided with the seal boss 11b airtight along border, and spool 3b is provided with seal groove 31b corresponding with seal boss 11b position and that cooperatively interact.Seal groove 31b can be set on seal boss 11b by prolapse upwards ground cover, the height of seal boss 11b is not less than the degree of depth of seal groove 31b, seal boss 11b comprises the primary sealing area 12b just right with seal groove 31b, seal groove 31b comprises secondary sealing area 32b, and primary sealing area 12b and secondary sealing area 32b offset and realize sealing.
This structure is exchanged the upper-lower position of seal boss 11b and seal groove 31b from different being in the first embodiment, and basic identical in other structure and embodiment do not repeating at this.
Understandably, above-mentioned each technical characteristics can combination in any uses and unrestricted.
The foregoing is only embodiment of the present utility model; not thereby limit the scope of the claims of the present utility model; every equivalent structure or conversion of equivalent flow process that utilizes the utility model specification and accompanying drawing content to do; or be directly or indirectly used in other relevant technical fields, be all in like manner included in scope of patent protection of the present utility model.
Claims (10)
1. a safety valve sealing structure, comprises and it is characterized in that valve seat and can be up or down and the spool of described valve seat upper-end surface laminating,
The upper-end surface of described valve seat is provided with at least one seal groove airtight along border, and described spool is provided with at least one seal boss corresponding with described at least one seal groove position and that cooperatively interact;
Described seal boss can be inserted in described seal groove prolapse upwards, the height of described seal boss is not less than the degree of depth of described seal groove, described seal boss comprises the primary sealing area just right with described seal groove, described seal groove comprises secondary sealing area, and described primary sealing area and described secondary sealing area offset and realize sealing; Or:
The upper-end surface of described valve seat is provided with at least one seal boss airtight along border, and described spool is provided with at least one seal groove corresponding with described at least one seal boss position and that cooperatively interact;
Described seal groove can be set on described seal boss by prolapse upwards ground cover, the height of described seal boss is not less than the degree of depth of described seal groove, described seal boss comprises the primary sealing area just right with described seal groove, described seal groove comprises secondary sealing area, and described primary sealing area and described secondary sealing area offset and realize sealing.
2. safety valve sealing structure according to claim 1, is characterized in that, described primary sealing area, described secondary sealing area are plane.
3. safety valve sealing structure according to claim 2, is characterized in that, the width of described primary sealing area is not less than 3mm.
4. safety valve sealing structure according to claim 2, is characterized in that, the section of described seal groove and described seal boss is all rectangular.
5. safety valve sealing structure according to claim 3, is characterized in that, the height of described seal boss is greater than the degree of depth of described seal groove.
6. safety valve sealing structure according to claim 3, is characterized in that, the height of described seal boss is greater than at least 1mm of the described seal groove degree of depth.
7. safety valve sealing structure according to claim 3, is characterized in that, between described seal boss and the bi-side of described seal groove, leaves gap.
8. safety valve sealing structure according to claim 3, is characterized in that, gap is left in the both sides of described seal boss between the bi-side of described seal groove, and the gap of both sides is identical.
9. safety valve sealing structure according to claim 3, is characterized in that, gap is left in the both sides of described seal boss between the bi-side of described seal groove, and the gap of both sides is all not less than 1mm.
10. safety valve sealing structure according to claim 1, is characterized in that, the quantity of described seal groove is no less than the quantity of described seal boss.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420141997.8U CN203847782U (en) | 2014-03-26 | 2014-03-26 | Safety valve sealing structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420141997.8U CN203847782U (en) | 2014-03-26 | 2014-03-26 | Safety valve sealing structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN203847782U true CN203847782U (en) | 2014-09-24 |
Family
ID=51560800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201420141997.8U Expired - Fee Related CN203847782U (en) | 2014-03-26 | 2014-03-26 | Safety valve sealing structure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN203847782U (en) |
-
2014
- 2014-03-26 CN CN201420141997.8U patent/CN203847782U/en not_active Expired - Fee Related
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN201680055U (en) | Noise reduction type adjusting valve | |
| CN201326823Y (en) | Corrugated pipe stop valve for chlorine | |
| CN105546208A (en) | Pressure reducing valve | |
| CN102748497A (en) | Ultra-low temperature top-mounted type ball valve | |
| CN201475391U (en) | Flat-plate gate valve with combined valve base | |
| CN203442472U (en) | Main steam trap | |
| CN203847782U (en) | Safety valve sealing structure | |
| CN103727254A (en) | High-temperature high-pressure self-balanced regulating valve | |
| CN203309238U (en) | High-temperature high-pressure spring full lift safety valve | |
| CN202719222U (en) | Corrugated pipe full-bore type safety valve | |
| CN104930214A (en) | Rapid installation type high pressure floating ball valve | |
| CN202402681U (en) | High temperature and high pressure ball valve | |
| CN205078828U (en) | Ball valve is fixed to upper assembling type bellows | |
| CN104879540A (en) | Pressure reducing valve with valve closing function | |
| CN204922047U (en) | Seal structure of valve and be used for bypass relief pressure valve of steam turbine | |
| CN204114259U (en) | There is the reduction valve of valve closing function | |
| CN201723767U (en) | Floating ball valve | |
| CN204114167U (en) | Reduction valve | |
| CN105587706B (en) | A kind of double electric high-pressure reversing valve design methods of deep-sea production tree electrichydraulic control valve group | |
| KR102080599B1 (en) | Check valve type high pressure valve | |
| CN105718696B (en) | A kind of deep-sea production tree electrichydraulic control valve group list electricity low pressure reversing valve designs method | |
| CN201747685U (en) | Position-selective multi-purpose ultrahigh pressure check valve combination device | |
| CN201651333U (en) | Special valve for chlorine gas | |
| CN210662257U (en) | Pressure limiting valve and oil pump with same | |
| CN204061928U (en) | A kind of single-seat adjusting valve sealing configuration |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20140924 Termination date: 20170326 |