CN203703179U - Dual-seal linkage pilot valve element structure of high differential pressure valve - Google Patents
Dual-seal linkage pilot valve element structure of high differential pressure valve Download PDFInfo
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- CN203703179U CN203703179U CN201420070005.7U CN201420070005U CN203703179U CN 203703179 U CN203703179 U CN 203703179U CN 201420070005 U CN201420070005 U CN 201420070005U CN 203703179 U CN203703179 U CN 203703179U
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Abstract
The utility model discloses a dual-seal linkage pilot valve element structure of a high differential pressure valve. According to the technical scheme, a fixing ring is mounted and fixed on the outer circle of the lower end of a valve rod, and an inner valve element assembly is mounted and connected to the lower end of the valve rod through the fixing ring. An annular boss is arranged on the outer circle of the valve rod, and a lower spring is pre-tightened and arranged between the annular boss of the valve rod and the inner valve element assembly in a sleeved mode. An inner hole of the lower section of an outer valve element is arranged on the outer circle of an inner valve element in a sleeved and defining mode, and the outer valve element and the inner valve element make relative movement in the axial direction in the process that the valve is closed, and a sealing ring is placed between the outer valve element and the inner valve element. An upper end platform of the outer valve element is placed on the upper side of the annular boss of the valve rod, a spring thrusting ring is fixed on the valve rod, and an upper spring is pre-tightened and is arranged between the spring thrusting ring and the upper plane of the outer valve element in a sleeved mode. A plurality of balance holes are formed in a valve element cover and the upper end of the outer valve element respectively. The dual-seal linkage pilot valve element structure of the high differential pressure valve has the advantages that the valve can acquire high sealing capacity, erosion and cavitation damage to sealing faces are reduced, meanwhile, the using reliability of the valve can be improved, and the service life of the valve is prolonged.
Description
Technical field
The utility model relates to a kind of valve mechanism, is specifically related to a kind of double seal valve cored structure of high-pressure differential valve.
Background technique
High-pressure differential valve is important valve and the critical valves in unit and the system of the industry such as power station, petrochemical industry often, and its usability and reliability have vital impact to the safety and stability of unit and system.As in the Water, steam circulation system of thermal power plant, install and use to water recycle modulating valve, Desuperheating water regulating valve, to empty exhaust steam valve, turbine by pass valve etc., its applying working condition is High Pressure Difference operating mode.Because the sealing surface both sides of high-pressure differential valve exist very high pressure reduction, if there is not leakage phenomenon in the sealability of sealing surface, the medium in leakage way can reach very high flow velocity, thereby brings erosion damage to sealing surface, and further sealing surface total failure is leaked and then made in aggravation; When valve is during in specific applying working condition, sometimes also need to consider the impact of cavitation erosion on valve and sealing surface, this more harsh working condition is had higher requirement to manufacturing and designing of valve sealing face.As the recirculation modulating valve (minimum flow valve) using in power plant's water supply system, entrance medium is the high-pressure feed water of pressure up to tens of MPa, outlet side parameter is pressure 1MPa left and right and approaches saturated water (parameter of oxygen-eliminating device), if existing, sealing surface leaks, what in leakage way, flow must be the own expansion of volume, the steam state medium that flow velocity is high, except meeting produces stronger erosion damage sealing surface, more seriously, the steam state medium that leaks to sealing surface outlet side will inevitably be converted into liquid state again, be that this class valve is as long as sealing surface has leakage will inevitably produce cavitation and cavitation damage near sealing surface outlet side, make the sealing surface of valve lose in the short period of time sealability completely.Therefore, this class valve need to have good sealability and sealing reliability, and regulates class valve because the end thrust of drive unit is relatively less than normal, thereby manufacturing and designing of valve proposed to very high requirement.
For this class valve, need in the design of sealing configuration, carry out targetedly new design.The mode of taking at the design aspect of this class valve sealing face at present mainly contains following several:
Take pressured type spool design.This mentality of designing is implemented relatively simple, thereby application is more extensive, the most representative with the product of U.S. CCI.Its working principle is that the effect that makes spool in the closed position be subject to pressure medium by the flow direction design of stream pass type is enhanced its sealability.Due to the impact of many factors, this mode in actual applications oneself to be proved to be its sealing reliability unsatisfactory: the one, because sealing surface is single metallic sealing section, on metallic sealing section, cause sealing surface to be not closed completely when close when valve has impurity clamping stagnation in off position, sealing surface can decline because the erosion damage of leaking medium make the sealability of valve; The 2nd, the spool of balance type only relies on a spring energy storage seal ring to realize sealing, and because its usability of spring energy storage seal ring of plastic material and reliability can be subject to the impact of valve working temperature, this also can cause the sealing reliability of valve not good.
The high-differential-pressure regulating valve product of U.S. Masoneilan (Masoneilan) company, in the time that the sealing requirements of valve is higher, adopt the inner side of the metal hard-sealing face on valve seat to roll the structure of the hard soft seal combination of embedding soft seal circle simultaneously, the sealability of valve is more eager to excel in whatever one does than single metal sealing, the part but this structure also comes with some shortcomings in use: the one, due to the pressurized creep of soft sealing material, the soft sealing face of valve and hard sealing surface are difficult to can maintain all the time comparatively ideal identical state and enough seal pressures in long-term use simultaneously; The 2nd, in the time that spool approaches closed condition, thereby can bearing relatively more washing away of flow at high speed medium, the poor soft sealing face of erosion resistibility affects its sealability.
CCI KK company of Japan (former Japanese ABB KK company), it gives the sealing surface structure of water recycle modulating valve, to adopt the structure that the hard soft seal combination of special-shaped soft seal circle is set in the inner side of the hard sealing surface of valve seat equally, different from U.S. Masoneilan corporate structure is, this structure special-shaped soft seal circle after valve closing can rely on pressure medium tensioner and be fitted on valve core sealed cover, its sealing reliability is relative with sealing life higher, but its deficiency is spool dwell period equally, soft sealing face can stand in the breach and be subject to washing away of flow at high speed medium, in addition, the turbidity test of its sealing reliability of this structure and medium have compared with Important Relations, thereby are also not suitable for the use of domestic power plant.
The Minimum Flowrate of Feed Pump valve (as shown in Figure 1) of HORA (Holter) company of Germany, valve seal adopts major-minor sealing surface structure, and major and minor sealing surface is metal hard-sealing; Valve closing and while opening, stagger the actuation time of major-minor sealing surface, by secondary sealing area protect primary sealing area do not have medium flow at high speed wash away with the state of cavitation under open and close, also strengthen the sealability of valve simultaneously by double seal.This structure, because mechanical structure is too complicated, in the time there is impurity in medium, easily causes the clamping stagnation of spool action, and when major-minor sealing surface is metal hard-sealing face simultaneously, its sealing reliability is also more easily subject to the impact of the impurity existing in medium.
The High Pressure Difference minimum flow regulating valve of Copes-Vulcan company of the U.S.; adopt double spool interlock, soft or hard double-sealing face structure (as shown in Figure 2); when valve closing; inner spool (sealing firmly) outside spool (soft seal) is first closed before; while closing with protection soft sealing face, avoid erosion damage, soft after valve closing, hard two sealing surfaces form " dual fail-safe " of sealing jointly.The shortcoming of this structure has three: the one, and the larger sealing force needing when the metallic sealing section of inner spool is closed only adds that by the spring force of several little springs the limited upper and lower pressure difference that medium acts on inner spool forms, the sealability relative deficiency of hard sealing surface; The 2nd, several bolts of fixing inner spool and spring are welded structure for reliable locking top adopts, and when maintenance, spool is disassembled inconvenience; The 3rd, although spool is balanced plug, while closing, medium active force is to the unlikely generation destruction of sealing hard, soft sealing face, but can not be as adopting the pressured type spool of stream pass type design by the effect of pressure medium, the sealability of valve is enhanced.
Summary of the invention
In order to overcome the existing above-mentioned some shortcomings part of existing structure, the utility model provides a kind of double-sealing interlock pilot valve cored structure that can make high-pressure differential valve have better sealability and sealing reliability.
To achieve these goals, the utility model is by the following technical solutions:
A double-sealing interlock pilot valve cored structure for high-pressure differential valve, it comprises valve seat, soft seal circle, inner spool, seal ring, retaining ring, cartridge cover, outer spool, lower spring, upper spring, valve rod and spring thrust ring.Soft seal circle is mounted on the outside of the hard sealing surface of valve seat; Be provided with while closing in the cylindrical lower end of inner spool and spool external sealed face that the hard sealing surface of valve seat is identical, at the spool inner sealing surface that guide's equalizing orifice in the center portion of inner spool suitable for reading is provided with while closing and the valve rod guide sealing surface of valve rod lower end is identical; Outer spool is the cylindrical shape of upper end band platform, and its lower end surface is when closing and the identical sealing surface of soft seal circle.The major technique key of the technical program is: retaining ring is fixed on the lower end cylindrical of valve rod, and the assemblying body of inner spool and cartridge cover is installed and is connected to valve rod lower end by retaining ring; On the cylindrical of valve rod, be provided with annular boss, lower spring pretension is also sleeved between the lower plane of annular boss and the upper plane of cartridge cover of valve rod; The hypomere inner hole sleeve of outer spool encloses the cylindrical in inner spool, both fasten and in process, have relative movement vertically at valve, seal ring is positioned between the two, the upper end platform of outer spool is positioned at the upside of the annular boss of valve rod, spring thrust ring is fixed on valve rod, pretension being sleeved between the upper plane of spring thrust ring and outer spool of upper spring.On the platform of the upper end of cartridge cover and outer spool, have respectively the equalizing orifice in the upper and lower space of multiple connections.
For the Placement of cartridge cover and inner spool, the utility model has added following two further technological schemes:
Cartridge cover is connected joint and seal ring is fixed between the two with inner spool with screw thread.
Cartridge cover is connected and engages and seal ring is fixed between the two with multiple screws or bolt with inner spool.
For the Placement of retaining ring and valve rod, the utility model has added following two further technological schemes:
Retaining ring is divided ring pattern, on the cylindrical of the lower end of valve rod, is provided with circular groove, and for the retaining ring of setting-in divided ring pattern, the assemblying body of inner spool and cartridge cover is installed and is connected to valve rod lower end by retaining ring.
Retaining ring screws, is fixed on to be threaded on the lower end cylindrical of valve rod, and the assemblying body of inner spool and cartridge cover is installed and is connected to valve rod lower end by retaining ring.
Installation means of fixation for spring thrust ring on valve rod, the utility model has also added following two further technological schemes:
Increase divided ring: the cylindrical place that is positioned at spring thrust ring upside at valve rod arranges circular groove and at groove setting-in divided ring, as spacing to the thrust upwards vertically of the upper plane of spring thrust ring and upper spring.
Spring thrust ring screws, is fixed on to be threaded on valve rod, as spacing to the thrust upwards vertically of the upper plane of upper spring.
The utility model has also added following three further technological schemes in addition:
Lower spring and upper spring, can be belleville spring group, can be also cylindrically coiled spring.
Seal ring is the inner spring energy-storage seal ring with metal energy storage spring.
Annular boss on valve rod, can be to be directly processed to form on valve rod, can be also that the part of processing is in addition installed the formation of fixedly getting on.
The beneficial effects of the utility model are: can only can provide under the prerequisite of end thrust relatively less than normal at drive unit, make valve there is stronger sealability, reduce because leaking washing away and cavitation erosion of the sealing surface that causes, can improve the operational safety of valve, extend the working life of valve simultaneously.
Accompanying drawing explanation
Fig. 1 is the High Pressure Difference minimum flow regulating valve valve inner structure schematic diagram of German HORA company.
The High Pressure Difference minimum flow regulating valve valve inner structure schematic diagram of Copes-Vulcan company of the Tu2Shi U.S..
Fig. 3 is that implementer's case of double-sealing interlock pilot valve cored structure of the high-pressure differential valve that proposes of the utility model is when the schematic diagram of spool during in valve opening and running state.
Fig. 4 is that closing process schematic diagram-inner spool sealing surface of implementer's case of the double-sealing interlock pilot valve cored structure of the high-pressure differential valve that proposes of the utility model arrives closed position.
Fig. 5 is that the closing process schematic diagram-outer valve core sealed cover of implementer's case of the double-sealing interlock pilot valve cored structure of the high-pressure differential valve that proposes of the utility model arrives closed position.
Fig. 6 is that closing process schematic diagram-valve rod guide sealing surface of implementer's case of the double-sealing interlock pilot valve cored structure of the high-pressure differential valve that proposes of the utility model arrives closed position.
Fig. 7 is the schematic diagram of the utility model for the additional relevant implementer's case of several partial structurtes.
In figure, 1, valve seat; 1-1, hard sealing surface; 2, soft seal circle; 3, inner spool; 3-1, spool external sealed face; 3-2, spool inner sealing surface; 4, seal ring; 5, retaining ring; 6, cartridge cover; 7, outer spool; 8, lower spring; 9, valve rod; 9-1, valve rod guide sealing surface; 9-2, annular boss; 10, upper spring; 11, spring thrust ring; 12, divided ring.
Embodiment
Below in conjunction with drawings and Examples, the technical solution of the utility model is further elaborated.
As shown in Fig. 3～Fig. 6, it is the technological scheme schematic diagram that double-sealing interlock pilot valve cored structure that the utility model proposes is applied to the structural design of thermal power station's High Pressure Difference minimum flow regulating valve.Valve is that the MEDIA FLOW of stream pass type of upper entering and lower leaving is to design.
The integral core modular construction of this valve is provided with two spools: outer spool (7) and inner spool (3), outer spool (7) is the cylindrical shape of upper end band platform, its lower end surface when closing with the identical sealing surface of the soft seal circle (2) in hard sealing surface (1-1) outside that is mounted on valve seat (1), the spool external sealed face (3-1) that the cylindrical lower end of inner spool (3) is provided with while closing and the hard sealing surface (1-1) of valve seat (1) is identical, at the spool inner sealing surface (3-2) that guide's equalizing orifice in the center portion of inner spool (3) suitable for reading is provided with while closing and the valve rod guide sealing surface (9-1) of valve rod (9) lower end is identical.Inner spool assembly parts is made up of inner spool (3) and cartridge cover (6) and seal ring (4) etc., cartridge cover (6) is connected joint and seal ring (4) is fixed between the two with inner spool (3) with screw thread, seal ring (4) is the inner spring energy-storage seal ring with metal energy storage spring; Inner spool assembly parts is installed and is connected to valve rod (9) lower end by retaining ring (5), retaining ring (5) is divided ring pattern, on the lower end cylindrical of valve rod (9), be provided with circular groove, for the retaining ring (5) of setting-in divided ring pattern.On the cylindrical of valve rod (9), be provided with annular boss (9-2), lower spring (8) is belleville spring group, and pretension is also sleeved between the lower plane and inner spool assembly parts of annular boss (9-2) of valve rod (9).The hypomere inner hole sleeve of outer spool (7) encloses in the cylindrical of inner spool (3), both fasten and in process, have relative movement vertically at valve, seal ring (4) is positioned between the two, and the upper end platform of outer spool (7) is positioned at the upside of the annular boss (9-2) of valve rod (9).Spring thrust ring (11) is fixed on valve rod (9) by the divided ring (12) being inlaid in the circular groove on valve rod (9); The annular boss (9-2) arranging on spring thrust ring (11) and valve rod (9) cylindrical, the upper plane that is used separately as upper spring (10) and lower spring (8) vertically thrust is upwards spacing, and the upper plane of annular boss (9-2) is also downward only by plane of orientation vertically as outer spool (7); Upper spring (10) is similarly belleville spring group, pretension and be sleeved on spring thrust ring (11) and the upper plane of outer spool (7) between.In addition,, on the upper end platform of cartridge cover (6) and outer spool (7), have respectively the equalizing orifice in the upper and lower space of multiple connections.
Upper spring (10) and lower spring (8) are after pretension, assembling, and external spool (7) and inner spool assembly parts produce downward vertically thrust respectively.
During when spool unlatching with in running state (as shown in Figure 3), outer spool (7) is under the thrust of upper spring (10), only fitting by the upper plane of the annular boss (9-2) on plane of orientation and valve rod (9) cylindrical of its inner chamber upper end, and inner spool assembly parts is also under the thrust of lower spring (8), only fitting by plane of orientation and the upper plane that is fixed on the retaining ring (5) on valve rod (9) of its cartridge cover (6) inner chamber upper end, outer spool (7) and inner spool assembly parts can move up and down with valve rod (9), simultaneously, between the valve rod guide sealing surface (9-1) of valve rod (9) lower end and spool inner sealing surface (3-2), in full-gear, (Lift h), make integral core assembly become balanced plug, reduced the steering force of valve.
In the time of valve closing, spool external sealed face (3-1) on inner spool (3) first contacts (as shown in Figure 4) with the hard sealing surface (1-1) on valve seat (1), now the sealing surface of outer spool (7) lower end not yet contacts with soft seal circle (2) that (distance is for a), and hard sealing surface is closed prior to soft sealing face.In this process, while approaching closed condition, the throttling of high flow rate medium is washed away substantially and is born by the hard sealing surface of metal, thereby has effectively protected the weak soft sealing face of erosion resistibility.
Continue to move down (inner spool assembly parts is motionless) along with valve rod (9), the annular boss (9-2) that outer spool (7) is also followed on valve rod (9) moves down and makes the sealing surface of its lower end contact (as shown in Figure 5) with soft seal circle (2), and hard sealing surface and soft sealing face all arrive closed position.Now, aperture between valve rod guide sealing surface (9-1) and spool inner sealing surface (3-2) is reduced to h-a by h, and the upper plane of retaining ring (5) is also left stopping by plane of orientation apart from being a of cartridge cover (6) inner chamber upper end.
Valve rod (9) continues to move down (inner spool assembly parts and outer spool (7) are all motionless), valve rod guide sealing surface (9-1) arrives closed position and spool inner sealing surface (3-2) coincide and compresses, valve rod (9) stop motion (as shown in Figure 6), valve closing has moved.Now, the upper plane of retaining ring (5) and cartridge cover (6) inner chamber upper end be only increased to h by the distance of plane of orientation, be only h-a by plane of orientation distance and the upper plane of annular boss (9-2) on valve rod (9) is also left outer spool (7) inner chamber upper end.
Because valve MEDIA FLOW designs to the flow direction of the stream pass type that has adopted upper entering and lower leaving, therefore after valve closing, outer spool (7) and inner spool (3) are all subject to the downward active force of medium simultaneously, thereby make the sealability of valve obtain larger enhancing.The downward active force of medium that outer spool (7) is subject to is for the toroidal surface product between its sealing surface center circle and seal ring (4) cylindrical is with pressure medium, and the spring force that this active force is added upper spring (10) forms the sealing force of outer spool (7); And the downward active force of the medium that inner spool (3) is subject to contacts toroidal surface product between justifying with pressure medium for its cylindrical with spool inner sealing surface (3-2) and valve rod guide sealing surface (9-1).
Compared with the mode that spool is loaded to thrust with the multiple less cylindrically coiled springs of employing, the upper spring (10) of the technical program and lower spring (8) adopt belleville spring, can prevent that the spring breakage phenomenon causing due to moment impact from occurring, and improved the operational safety of valve in the time of valve fast opening and closing.
In technique scheme, some partial structurtes also can take other scheme to implement (as shown in Figure 7) as required:
For the larger valve of bore, cartridge cover also can adopt the mode being connected with multiple screws or bolt and seal ring is fixed between the two with inner spool.
Retaining ring also can adopt to be threaded and screw, is fixed on the lower end cylindrical of valve rod.
Spring thrust ring equally also can adopt to be threaded to screw, be fixed on valve rod.
Upper spring and lower spring also can adopt cylindrically coiled spring if desired.
Annular boss on valve rod, can be to be directly processed to form on valve rod, can be also that the part of processing is in addition installed the formation of fixedly getting on.
Below by reference to the accompanying drawings embodiment of the present utility model is described, but these explanations can not be understood to limit scope of the present utility model.Those skilled in the art should know; the utility model is not restricted to the described embodiments; its protection domain is defined by appending claims; any not exceeding the various changes in the scope that the utility model claims define, the technological scheme that modification forms; all do not depart from spirit of the present utility model and technical spirit, within still can belonging to claim scope of the present utility model.
Claims (10)
1. the double-sealing of a high-pressure differential valve interlock pilot valve cored structure, it comprises valve seat (1), soft seal circle (2), inner spool (3), seal ring (4), retaining ring (5), cartridge cover (6), outer spool (7), lower spring (8), upper spring (10), valve rod (9) and spring thrust ring (11); Soft seal circle (2) is mounted on the outside of the hard sealing surface (1-1) of valve seat (1); Be provided with while closing in the cylindrical lower end of inner spool (3) and spool external sealed face (3-1) that the hard sealing surface (1-1) of valve seat (1) is identical, at the spool inner sealing surface (3-2) that guide's equalizing orifice in the center portion of inner spool (3) suitable for reading is provided with while closing and the valve rod guide sealing surface (9-1) of valve rod (9) lower end is identical; Outer spool (7) is the cylindrical shape of upper end band platform, the sealing surface that there is a surface its lower end when closing and soft seal circle (2) is identical; It is characterized in that: retaining ring (5) is fixed on the lower end cylindrical of valve rod (9), the assemblying body of inner spool (3) and cartridge cover (6) is installed and is connected to valve rod (9) lower end by retaining ring (5); On the cylindrical of valve rod (9), be provided with annular boss (9-2), lower spring (8) pretension is also sleeved between the lower plane of annular boss (9-2) and the upper plane of cartridge cover (6) of valve rod (9); The hypomere inner hole sleeve of outer spool (7) encloses in the cylindrical of inner spool (3), both fasten and in process, have relative movement vertically at valve, seal ring (4) is positioned between the two, the upper end platform of outer spool (7) is positioned at the upside of the annular boss (9-2) of valve rod (9), it is upper that spring thrust ring (11) is fixed on valve rod (9), upper spring (10) pretension and be sleeved on spring thrust ring (11) and the upper plane of outer spool (7) between; On the upper end platform of cartridge cover (6) and outer spool (7), have respectively the equalizing orifice in the upper and lower space of multiple connections.
2. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, is characterized in that: cartridge cover (6) is connected joint and seal ring (4) is fixed between the two with inner spool (3) with screw thread.
3. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, is characterized in that: cartridge cover (6) is connected and engages and seal ring (4) is fixed between the two with multiple screws or bolt with inner spool (3).
4. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, it is characterized in that: retaining ring (5) is divided ring pattern, on the lower end cylindrical of valve rod (9), be provided with circular groove, for the retaining ring (5) of setting-in divided ring pattern, the assemblying body of inner spool (3) and cartridge cover (6) is installed and is connected to valve rod (9) lower end by retaining ring (5).
5. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, it is characterized in that: retaining ring (5) screws, is fixed on to be threaded on the lower end cylindrical of valve rod (9), the assemblying body of inner spool (3) and cartridge cover (6) is installed and is connected to valve rod (9) lower end by retaining ring (5).
6. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, also comprise divided ring (12), it is characterized in that: the cylindrical place that is positioned at spring thrust ring (11) upside at valve rod (9) is provided with circular groove and at groove setting-in divided ring (12), as spacing to the thrust upwards vertically of the upper plane of spring thrust ring (11) and upper spring (10).
7. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, it is characterized in that: spring thrust ring (11) screws, is fixed on valve rod (9) to be threaded upper, as spacing to the thrust upwards vertically of the upper plane of upper spring (10).
8. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, is characterized in that: lower spring (8) and upper spring (10) can be belleville spring group, can be also cylindrically coiled spring.
9. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, is characterized in that: seal ring (4) is for inside is with the spring energy-storage seal ring of metal energy storage spring.
10. the double-sealing of high-pressure differential valve according to claim 1 interlock pilot valve cored structure, it is characterized in that: the annular boss (9-2) on valve rod (9), can be to be directly processed to form on valve rod (9), can be also that the part of processing is in addition installed the formation of fixedly getting on.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201420070005.7U CN203703179U (en) | 2014-02-18 | 2014-02-18 | Dual-seal linkage pilot valve element structure of high differential pressure valve |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201420070005.7U CN203703179U (en) | 2014-02-18 | 2014-02-18 | Dual-seal linkage pilot valve element structure of high differential pressure valve |
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| CN203703179U true CN203703179U (en) | 2014-07-09 |
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| CN201420070005.7U Withdrawn - After Issue CN203703179U (en) | 2014-02-18 | 2014-02-18 | Dual-seal linkage pilot valve element structure of high differential pressure valve |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103939629A (en) * | 2014-02-18 | 2014-07-23 | 章华 | Double-seal linkage pilot valve element structure of high-pressure-difference valve |
| CN106051241B (en) * | 2016-07-18 | 2019-01-04 | 三河平恩康汽车技术有限公司 | A kind of electronics relief valve |
| WO2019022932A1 (en) * | 2017-07-24 | 2019-01-31 | Fisher Controls International Llc | Seal assemblies for use with fluid valves |
| CN110778756A (en) * | 2019-11-16 | 2020-02-11 | 永嘉企达知识产权咨询有限公司 | Double-sealing auxiliary check valve |
-
2014
- 2014-02-18 CN CN201420070005.7U patent/CN203703179U/en not_active Withdrawn - After Issue
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103939629A (en) * | 2014-02-18 | 2014-07-23 | 章华 | Double-seal linkage pilot valve element structure of high-pressure-difference valve |
| CN106051241B (en) * | 2016-07-18 | 2019-01-04 | 三河平恩康汽车技术有限公司 | A kind of electronics relief valve |
| WO2019022932A1 (en) * | 2017-07-24 | 2019-01-31 | Fisher Controls International Llc | Seal assemblies for use with fluid valves |
| US10352459B2 (en) | 2017-07-24 | 2019-07-16 | Fisher Controls International, Llc | Seal assemblies for use with fluid valves |
| CN110778756A (en) * | 2019-11-16 | 2020-02-11 | 永嘉企达知识产权咨询有限公司 | Double-sealing auxiliary check valve |
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